Спутник ФКИ. ICESat. [Редактировать]

ICESat, один из спутников НАСА предназначенный для дистанционного зондирования Земли, предназначался для проведения измерний объемов льда на планете, частиц и аэрозолей в атмосфере, измерения растительного покрова.  Он проработал 7 лет и был затоплен в феврале 2010 года после того как отказала полезная нагрузка и НАСА не смогло ее перезапустить. 

Дополнительные наименования

#НаименованияПоиск в новостяхПоиск в документах
1Ice, Cloud, and Land Elevation SatelliteНайтиНайти
227642НайтиНайти

Дополнительная классификация

#Наименования
1Тип оператора(владельца) - государственный
2Страна оператор(владелец) - США
3Страна производитель - США

Новостная лента[Найти информацию в новостях] [Найти информацию в документах]

#Новостная лента.
12003-07 - 2003-08. Один из трех бортовых лазеров отказалТэги: ICESat

Технические характеристики

#ХарактеристикаЗначение
1Масса, кг970
2Масса (полезная нагрузка), кг302
3Масса (платформа), кг580
4Масса (топливо), кг76
5Емкость запоминающего устройства (для научных данных), ГБит56
6Емкость запоминающего устройства (для телеметрии), мБит в секунду256
7Платформа 1xBCP-2000
8Мощность солнечных батарей (конец жизни), Вт1962
9Мощность (предоставляемая), Вт696
10Мощность (требуемая), Вт825
11Мощность (полезная нагрузка), Вт350
12Емкость (аккумулятора), ампер часов40
13Точность определения позиции, град<0.006
14Скорость работы полезной нагрузки, мБит в секунду40
15Точность контроля позиции, град<0.006
16Точность позиционирования, метра<<30

Характеристики орбиты

#ХарактеристикаЗначение
1САС, год7
2Дата (сведения с орбиты)2010-08-30

Пусковые характеристики

#ХарактеристикаЗначение
1Код NSSDC2003-002A

Экономические характеристики

#ХарактеристикаДата измеренияЗначение
1Оператор Космическое агентство США
2Производитель Ball Aerospace
3Производитель Ball Aerospace

Информация об удачном запуске

#ХарактеристикаЗначение
1Дата пуска2003-01-13 at 00:45:00 UTC
2Полезная нагрузка 1xICESat
3Полезная нагрузка 1xCHIPS
4Ракета-носитель 1xДельта 2

Найдено 801 документов по запросу «ICESat». [Перейти к поиску]


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..., Cloud, and land Elevation Satellite (ICESat) and from the Gravity Recovery... and follow-on missions to ICESat and GRACE). Implicit in our... follows. We first describe the ICESat and GRACE observations used for... in additional detail. 2.1 Model validation: ICESat observations For model validation, we... Altimeter System (GLAS) aboard the ICESat satellite. GLAS was the first... during a period coincident with the ICESat and GRACE observations. The models... are based in part on ICESat observations, as discussed further in.... To further facilitate comparison to ICESat observations, we extract model output... below. Since the locations of ICESat data rarely coincide with the... four model elevations surrounding each ICESat measurement were interpolated bilinearly in... model elevation at the ICESat measurement location. ICESat measurements without four surrounding... validation framework Figure 6. Histogram of ICESat minus modeled surface elevation differences... + FF simulation. Figure 5. Map of ICESat minus modeled surface elevation differences... locations of ICESat observations. Gray areas represent regions where no ICESat observations... and observation location (km) vs. ICESat minus modeled surface elevation differences... better and relatively worse simulations. 5.1 5 ICESat metrics Qualitative and quantitative metrics... For the qualitative comparison to ICESat observations, we present three types... grid cell to the nearest ICESat observation point (e.g., Fig. 7). All of... example, a difference in model and ICESat www.geosci-model-dev.net... for model (CISM) vs. ICESat observations (ICESat-model) for the SMB-only...-sheet metrics for model vs. ICESat observations (ICESat-model) for the SMB... biases as a result of sparse ICESat sampling would be identifiable using... comparison between model output and ICESat observations is given by standard...-sheet metrics based on the ICESat observations and confirm that the...-ice-sheet scale, our proposed ICESat metrics are unable to confirm... show additional values of our ICESat z metric in Fig. 8, which were... for the particular dates of ICESat observational data used here. But... relative short time span of ICESat data, we only conduct this... the ICESat period (e.g., ERS-1/2 radar altimetry) and after (e.g., Operation Ice Bridge; ICESat...) includes some of the same ICESat observations that we compare our... the good match between the ICESat observations and the persistence model... and firn, as do the ICESat data that are used in... to surface elevation snapshots from ICESat provides both whole-ice-sheet... Greenland ice sheet. Based on ICESat altimetry observations and GRACE gravimetry... the ICESat observations and simulations conducted here, the related ICESat metrics are... in the absence of the ICESat comparison, which provide initial confidence... et al. (2015a). The raw ICESat and GRACE data discussed above... at http: //nsidc.org/data/icesat/data.html and http://podaac..., B., Quinn, K., Palm, S., Spinhirne, J., and Thomas, R.: ICESat’s laser measurements of polar ice..., T., Minster, J., Spinhirne, J., and Thomas, R.: GLAS/ICESat L2 Antarctic and Greenland Ice...



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... together with the utilisation of ICESAT has improved the products in... of satellites such as GRACE, ICESat, Envisat and CryoSat. The monitoring... anomalies and dynamic topography from ICESat measurementes. - Copenhagen : University of Copenhagen... from surface and airborne gravity, ICESAT and GRACE. 18 Presented at... and gravity from surface data, ICESAT and GRACE – a reference for CryoSat... Greenland ice sheet from GRACE, ICESat and airborne laser Presented at... Arctic Ocean from GRACE and ICESat Type: Talk / Oral presentation Note... in the Arctic Ocean from ICESat, GRACE and airborne measurements Type... Arctic Ocean from GRACE and ICESAT Type: Workshop / Seminar Note Forsberg... in the Arctic Ocean from ICESAT, GRACE and airborne measurements Type... of the Arctic – Improved by ICESat and GRACE In: Geomatica, vol... of the Arctic – Improved by ICESat and GRACE. Presented at: IPY... in the Arctic Ocean from ICESat Presented at: Gravity Field of... in the Arctic Ocean from ICESat and airborne lidar – a comparison Type..., Henriette; Forsberg, René Validation of ICESat sea ice elevations near Churchill...



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... Missions.......................... 17 SMAPVEX-15......................................................................................................... 18 ICESat-2 - SIMPL................................................................................................... 19 HyspIRI Preparatory Airborne... algorithm development for the upcoming ICESat-2 and NISAR missions. The Program... 2015. Science ICESat-2 - SIMPL Ice, Cloud, and land Elevation Satellite-2 (ICESat-2): Airborne efforts support geophysical algorithm development for the ICESat-2 payload. ICESat-2 will... pulses. To further refine the ICESat-2 geophysical algorithms, NASA recently conducted... to collect algorithm data for ICESat-2. This mission is described separately.... This has included SMAP and IceSAT-2. Next will be SWOT and... Airborne Science Program • Appendix C 85 I ICESat Ice, Cloud, and land Elevation...



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... vegetation canopy height Satellite: ICESat GLAS (past), (Future IceSat-2 ATLAS) In Australia... altimeter instruments, NASA is developing ICESat-II for launch in 2017... original ICESat mission, which also carried a LiDAR – though the technology for ICESat-II makes use of a different laser wavelength. ICESat-II...



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... © Author(s) 2016. CC Attribution 3.0 License. ICESat laser altimetry over small mountain... rough mountain terrain. Differences between ICESat GLAS elevations and reference elevation... ICESat acquisition period 2003–2008. We find spatially varying biases between ICESat... the method, rather than ICESat uncertainty. ICESat matches glacier size distribution of... thematic subsetting. Vertical offsets to ICESat elevations vary for different glaciers... Geosciences Union. 2130 D. Treichler and A. Kääb: ICESat laser altimetry over small mountain... such as the Himalayas. Subsequently, ICESat elevation measurements combined with the.../10/2129/2016/ D. Treichler and A. Kääb: ICESat laser altimetry over small mountain...., 2011; Andreassen et al., 2016). 2.2 ICESat ICESat GLAS was a single-beam spaceborne... analyses, the ICESat data set used was GLAS/ICESat L2 Global Land... and A. Kääb: ICESat laser altimetry over small mountain glaciers Methods ICESat data points... al. (2012) where differences between ICESat elevations and a reference DEM (hereafter... spatial coverage before complete ICESat failure.) Note that ICESat captures a signal of...-processing and filtering of ICESat data ICESat surface elevations (height above reference... and spatially co-registered with ICESat (see Sect. 3.2). Reference elevations for... land, and ∼ −2 m for ice samples (i.e. ICESat elevations are lower than reference... between DEM acquisition date and ICESat elevation measurements are included while.../10/2129/2016/ D. Treichler and A. Kääb: ICESat laser altimetry over small mountain.... The elevation corrections assessed include ICESat saturation elevation correction (attribute d_satElevCorr...–2146, 2016 2134 D. Treichler and A. Kääb: ICESat laser altimetry over small mountain... frequency Normalised frequency 0.16 dh ICESat - Kartverket DEM, uncorrected Samples on... ICESat sample overview Roughly 75 % of the nearly 170 000 ICESat footprints... appropriate. 4.2 Representativeness of ICESat glacier sample The entire ICESat glacier sample appears... glacierized surface in southern Norway, ICESat slightly oversamples east-facing glaciers.../10/2129/2016/ D. Treichler and A. Kääb: ICESat laser altimetry over small mountain... Figure 3. Representativeness of 2003–2008 ICESat autumn campaign samples in terms.../ 4.3 Error sources and corrections for ICESat and DEM elevations Elevation errors... of corrections available in the ICESat products. ICESat elevation corrections from effects..., 2129–2146, 2016 D. Treichler and A. Kääb: ICESat laser altimetry over small mountain... dh are signifi- 0.4 0.3 0.2 0.1 0 -10 -8 -6 -4 -2 0 2 dh ICESat-DEM [m] 4 6 8 10 Figure 4. Graph shows... [m] Surface elevation difference [m] D. Treichler and A. Kääb: ICESat laser altimetry over small mountain...–2146, 2016 2138 D. Treichler and A. Kääb: ICESat laser altimetry over small mountain... to zero-elevation difference between ICESat and reference DEM considering decreasing... application of saturation correction to ICESat elevations. Exclusion of saturated samples... ICESat trend. 5 5.1 Discussion Representativeness When combined with reference elevations from a DEM, ICESat.../10/2129/2016/ D. Treichler and A. Kääb: ICESat laser altimetry over small mountain.../10/2129/2016/ When relating ICESat trends to traditional glaciological measurements... D. Treichler and A. Kääb: ICESat laser altimetry over small mountain glaciers 8 7 6 dh ICESat-DEM.../mass changes as derived from ICESat, compared to traditional glaciological methods... density and ICESat track density (i.e. sample size), representativeness of the ICESat sample... areas may potentially yield valid ICESat glacier surface elevation change estimates.../10/2129/2016/ D. Treichler and A. Kääb: ICESat laser altimetry over small mountain... A. Kääb: ICESat laser altimetry over small mountain glaciers to co-register ICESat and.../10/2129/2016/ D. Treichler and A. Kääb: ICESat laser altimetry over small mountain..., the coarse spatial sample of ICESat represents southern Norwegian glaciers accurately... some campaigns. The applicability of ICESat in arbitrary glacierized regions depends... in reference DEM elevations exceed ICESat uncertainties by a magnitude. Elevation bias... the random effects from geographic ICESat footprint distribution. We developed a new... the reference DEMs rather than ICESat performance. ICESat provides an accurate sample...–2146, 2016 2144 D. Treichler and A. Kääb: ICESat laser altimetry over small mountain..., C. C. and Harding, D. J.: SRTM C-Band and ICESat Laser Altimetry Elevation Comparisons as..., M. A., Luthcke, S. B., and Blair, J. B.: Estimation of ICESat intercampaign elevation biases from comparison.../10/2129/2016/ D. Treichler and A. Kääb: ICESat laser altimetry over small mountain... Grosser Aletschgletscher, Swiss Alps, from ICESat Laser Altimetry Data and Digital..., 2010. Molijn, R. A., Lindenbergh, R. C., and Gunter, B. C.: ICESat laser full waveform analysis for...–2146, 2016 2146 D. Treichler and A. Kääb: ICESat laser altimetry over small mountain..., T., Minster, J., Spinhirne, J., and Thomas, R.: GLAS/ICESat L2 Global Land Surface Altimetry...



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..., Cloud, and Land Elevation Satellite (ICESat) Lead Agency: National Aeronautics and..., Cloud, and Land Elevation Satellite (ICESat) which would retrieve global distributed.... For Further Information James Watzin ICESat Project Office NASA’s Goddard Space... Satellite (ICESat) mission. This EA discusses the objectives of the ICESat mission and its potential environmental impacts. ICESat is the... OF ENVIRONMENTAL ASSESSMENT............................................1-2 PROPOSED ACTION ..............................................................................2-1 2.1.1 ICESat Mission Development, Fabrication, Assembly, Test... Laser Altimeter System (GLAS)....................................2-2 2.1.3 ICESat Launch ............................................................................2-3 2.1.4 ICESat On-Orbit Mission Operations ..............................................2-4 2.1.5 Spacecraft... Vibration .................................................3-7 3.2.9 Cultural/Historical/Archaeological Resources...................................3-7 ICESAT ON-ORBIT MISSION OPERATION ................................................3-7 iv... Launch Site.....................................................................4-1 4.1.1.1 Environmental Impacts of ICESat Launch Preparation ........4-1 4.1.1.2 Environmental Impacts of... Processing Facility (PPF) ..............................4-9 4.1.1.3.3 Launch Failure ...........................................................4-9 4.1.2 ICESat On-Orbit Operation............................................................4-9 4.1.2.1 Normal Operation...).................................................. 2-4 2-3 ICESat orbiting above the Earth pictorial ....................................................... 2-5 LIST OF TABLES Table Page 2-1 ICESat... Vehicle (First Stage and GEMs) ................................................................................................ 4-2 4-2 ICESat hazardous chemicals/materials .......................................................... 4-6 4-3 REs and..., Cloud, and Land Elevation Satellite (ICESat) mission would provide data that... global climate change. Specifically, the ICESat mission would measure changes of... 1999). Additional objectives of the ICESat mission include (1) measurement of cloud... ALTERNATIVES PROPOSED ACTION The proposed ICESat mission is a cooperative effort between..., University of Texas, Austin, Texas. 2.1.1 ICESat Mission Development, Fabrication, Assembly, Test... at BATC. ICESat spacecraft features are shown below: 2-1 Table 2-1. ICESat Spacecraft Features... a bell curve. 2.1.3 ICESat Launch NASA GSFC proposes to launch ICESat in late... space launch vehicle 2.1.4 ICESat On-Orbit Mission Operations ICESat would be launched... discussed below. 2-4 Figure 2-3. Diagram of ICESat orbiting above the Earth The... the data archive facilities. The ICESat Science Computing Facility (SCF), which... for ICESat science data. 2.1.5 Spacecraft Decommissioning at the End-of-Mission ICESat... to five years, total. Therefore, ICESat would have sufficient spacecraft expendables... the Earth’s radiation budget. Although ICESat is designed to collect information... medium size satellites such as ICESat. Alternative launch vehicles include the... the launch site, because the ICESat mission science requires a high inclination... modifications are proposed for the ICESat mission. 3.3 ICESAT ON-ORBIT MISSION OPERATION... sonic boom. 4.1.1.1 Environmental Impacts of ICESat Launch Preparation Hazardous materials are... endangered species. 4.1.1.2.10 Socioeconomics The ICESat launch from VAFB would be... wastes. 4.1.1.2.13 Environmental Justice The ICESat launch would be a routine launch... the U.S. Census Bureau criteria. The ICESat launch would not have disproportionate... launch sites. 4-5 4.1.1.2.14 Hazards The ICESat presents routine hazards, which are... would augment visual inspection. Table 4-2. ICESat hazardous chemicals/materials Substance Quantity... environmental hazards connected to the ICESat mission exist, a number of safety... objectives for pollution prevention. The ICESat mission, during spacecraft processing, would... reducers have been eliminated from ICESat processing. The cleaning at instrument... would be anticipated. 4.1.2 ICESat On-Orbit Operation The ICESat on-orbit laser..., separation and deployment nor does ICESat release any operational debris during.... Effect of ICESat Off-Nadir pointing maneuver The ICESat spacecraft would occasionally... area for ICESat is 3.63 m2 (39 ft2). Therefore, ICESat satisfies the... environment. 4-12 4.1.2.3 Accident Scenario The ICESat laser would not be activated... exposed to the laser energy. ICESat utilizes a hydrazine monopropellant pressurized with..., Cloud, and Land Elevation Satellite (ICESat) Mission Specification, MDC 99H0061. Klock..., Cloud and Land Elevation Satellite (ICESat) Project Plan, 401-PG7120.2.3. NASA... Center Hampton, Virginia. NASA 2000b. ICESat GLAS Laser Safety Analysis Report..., Cloud and Land Elevation Satellite (ICESat) Orbital Debris Assessment Report, January...



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..., doi:10.1029/2005GL024306, 2005 ICESat sea level comparisons Timothy J. Urban... October 2005; published 3 December 2005. [1] ICESat calculations of sea level and... the ICESat Laser 2a Release 21 GLA15 ocean elevations. A global ICESat ocean... sea surface (MSS). Dual-satellite (ICESat - TOPEX) crossovers independently verify this.... Release 21 improvements have mitigated ICESat’s thermally-induced day/night laser... is 12 cm for ICESat, 7 cm for TOPEX. ICESat laser altimetry is.... Citation: Urban, T. J., and B. E. Schutz (2005), ICESat sea level comparisons, Geophys. Res..., doi:10.1029/2005GL024306. 1. Introduction [2] ICESat’s Geoscience Laser Altimeter System (GLAS... are routinely used for improving ICESat laser pointing determination, incorporated through... accuracy of the ICESat elevations in ocean areas. 2. Data [3] ICESat Release 21... editing has been performed where ICESat elevations deviate more than 10... ICESat laser and radar altimetry are data rate (40 Hz for ICESat, pulse-averaged 1 Hz for TOPEX) and footprint size (65 m for ICESat... from ICESat: 2003 – 2005, submitted to Geophysical Research Letters, 2005), the ICESat...]. To compensate, we compute an ICESat 1-Hz normal point product that... following comparisons are performed with ICESat 1-Hz normal points except where... variations. The dailyaveraged SSA for ICESat and TOPEX are computed similarly... L23S10 1 of 5 URBAN AND SCHUTZ: ICESAT SEA LEVEL COMPARISONS L23S10 L23S10... 1-Hz ICESat and TOPEX Data (±65°, depth > 500 m)a 40 Hz ICESat DOY 2003 Mean RMS Points 270 307 1 Hz ICESat TOPEX... during L2a. daily changes in ICESat performance. Daily variations observed in... overall mean SSA of ICESat is the ICESat ocean elevation bias. This... 2 cm), detectable jumps in the ICESat curve of Figure 1. The suspicion... in the data. [9] Computations using ICESat 1-Hz normal points are comparable... both ICESat and TOPEX 1-Hz data in Figure 1. The 40-Hz ICESat... ocean waves and variability. The ICESat map displays erroneously high SSA.... [11] Ocean mesoscale correlations between ICESat and radar altimetry were first... all the major currents observable. ICESat variability is 2.7 cm higher than... of differences observed between the ICESat and TOPEX maps in Figures..., while ICESat did not repeat its ground track during L2a, giving ICESat.... [12] Various subsets of global ICESat data were examined including latitudes... global results. One reason that ICESat performance appears adversely affected in... satellites are all less than ICESat; and radar and radiometer footprint... (12 cm). Additionally, high-latitude ICESat data suffer from sea ice... of Daily Global SSA Solutionsa ICESat TOPEX Case Latitude, Depth Bounds.... 2 of 5 L23S10 URBAN AND SCHUTZ: ICESAT SEA LEVEL COMPARISONS L23S10 Figure... – descending. Figure 2. L2a SSA from (a) ICESat (À10.0 cm elevation bias removed... elevation variations observed in earlier ICESat data releases were detected, in... average local solar time of ICESat descending passes was $8 hours (day... was $20 hours (night), with ICESat having a slowly varying node rate... for TOPEX (4.3 cm) than for ICESat (1.6 cm). We speculate that this...-satellite crossovers are computed for ICESat and TOPEX during the L2a... mean crossover difference, but for ICESat significantly increases its RMS and... from (a) ICESat (average = 11.6 cm) and (b) TOPEX (average = 8.9 cm). ICESat TOPEX Latitude...: ICESAT SEA LEVEL COMPARISONS L23S10 Table 4. Dual-Satellite Ocean Crossovers Statisticsa ICESat... ICESat, 7.4 cm for TOPEX. [15] Dual-satellite crossovers are computed as ICESat... third of ocean waves. For ICESat, unfortunately, a SWH parameter is not... from the GLA data. An ICESat 1-Hz normal point encompasses a similar..., this further indicates that an ICESat SSB correction is necessary. Further... paradigm using scaled SWH. For ICESat, however, parameters other than SWH... for future research. 6. Discussion [17] ICESat elevation accuracy over the oceans... to those observed by TOPEX. ICESat- L23S10 TOPEX dual-satellite crossovers..., ICESat displays a smoother time series than TOPEX, but in general, ICESat data... correction for future investigtion. [18] ICESat’s data density, coverage, and precision... contamination creates coastal exclusion zones. ICESat is unique in its ability... Ocean from ICESat, submitted to Geophysical Research Letters, 2005]. [19] ICESat laser.... While the conceptual measurement between ICESat laser and typical radar altimetry.... Precise geolocation is essential for ICESat, with laser pointing errors being... similar comparisons with TOPEX. [20] ICESat was designed to meet challenging... sea level evaluations using other ICESat laser campaigns, examination of a SSB..., and B. Bills (2005), Assessment of ICESat performance at the salar de... of ocean mesoscale monitoring with ICESat altimetry, Eos Trans. AGU, 85..., and M. Sirota (2005), Reduction of ICESat systematic geolocation errors and the...: ICESAT SEA LEVEL COMPARISONS Martin, C. F., R. H. Thomas, W. B. Krabill, and S. S. Manizade (2005), ICESat range.... L23S10 Zwally, H., et al. (2002), ICESat’s laser measurements of polar ice...



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... The ICESat-2 Laser Altimetry Mission Planned to launch in 2015, ICEsat-2 will... Cloud and Land Elevation Satellite (ICESat). In particular, declines in Arctic... of ice sheet Elevation Satellite-2 (ICESat-2), currently planned for launch in... temporal changes can be estimated. ICESat-2 will provide important information on.... When combined with the original ICESat observations, ICESat-2 will provide ice change... possible before. KEYWORDS | Ice sheets; ICESat-2; laser altimetry; NASA; satellite; sea... apply. Abdalati et al.: The ICESat-2 Laser Altimetry Mission accelerated dramatically... Cloud and Land Elevation Satellite-2 (ICESat-2) is specifically intended to quantify... Cloud and Land Elevation Satellite (ICESat). These laser altimeter measurements will.... 1. Schematic diagram of ICESat on a transect over the Arctic. ICESat uses a 1064... apply. Abdalati et al.: The ICESat-2 Laser Altimetry Mission Table 1 Acquisition..., 2009. Despite its compromised operation, ICESat has demonstrated a remarkable capability not... call for an ICESat follow-on mission [34]. ICESat-2 is intended to... that were successfully begun by ICESat despite its compromised operating condition... launch of ICESat are such that the problems experienced with ICESat’s analog... capabilities of ICESat-2. III . ICESa t-2 MI SSION OBJ ECTIVES Like ICESat, ICESat-2 is... ICESat-2 Laser Altimetry Mission Fig. 2. Changes in ice elevation derived from ICESat... considerations, the SDT determined that ICESat-2 must be capable of resolution... ICESat laser altimetry [9], [20]). Arctic Ocean sea ice thickness from two ICESat.... A recent assessment [9] shows that the ICESat thickness estimates are within 0.5 m of... estimate above-ground biomass, while ICESat-2 mainly focuses on ice. Nevertheless... illumination of trees by an ICESat or ICESat-2 laser spot (left) and... from the ICESat mission [25] suggest that extending the ICESat capability to a 91-day continuous measurement could make ICESat-2 capable... derived from ICESat. The capability of retrieving tree height with ICESat-2 will... apply. Abdalati et al.: The ICESat-2 Laser Altimetry Mission improvements would..., the atmospheric measurement capability of ICESat-2, even at near-IR wavelengths... range of capabilities indicates that ICESat-2 will make important multidisciplinary science... the ICESat orbit enables direct repeat-track comparisons between ICESat and ICESat-2, which... roughness characteristics sufficiently, so that ICESat-2 can achieve the desired measurement... actual ICESat data, cloud-clearing based on the 1064 nm ICESat return... existing ICESat 1064-nm channel would need to be available for ICESat... interpretation of elevationchange signals from ICESat-2. C. Mission Duration A major consideration for... between the earliest ICESat measurements and the latest ICESat-2 measurements to quantify...-term variability in the combined ICESat/ICESat-2 time series. Strategies being adopted... laser system like GLAS on ICESat, a baseline configuration with a footprint size... a telescope size of 1-m like ICESat carried. ICESat-2 SDT analyses show that at... a modified version of the original ICESat engineering test unit have demonstrated... of development. However, experiences with ICESat and associated lessons-learned have... success of ICESat-2 is understanding and overcoming the causes of ICESat’s premature... satellite laser altimetry measurements between ICESat and ICESat-2. In the intervening period.... Abdalati et al.: The ICESat-2 Laser Altimetry Mission ICESat-2 and Cryosat-2, however... technologies are very different between ICESat/ICESat-2 and Cryosat-2, each is a valuable... options have been examined for ICESat-2. The simplest employs a singlebeam near... be very similar to ICESat (Fig. 1). Like ICESat, it would carry multiple... an inclination of 94 , ICESat-2, like ICESat, will not be sun-synchronous... et al.: The ICESat-2 Laser Altimetry Mission For ICESat-2, two candidate options..., the original ICESat mission never realized its full potential. ICESat has, however... climate prediction capability. For vegetation, ICESat-2 will contribute to largescale biomass... vegetation and ecosystem science objectives. ICESat-2 will be capable of supporting..., the final configuration of the ICESat-2 mission is REFERENCES [1] R. Thomas, E. Frederick... on the capabilities demonstrated by ICESat and planned improvements that follow... on operational characteristics of the ICESat mission. cover: 2003–2008,[ J. Geophys... apply. Abdalati et al.: The ICESat-2 Laser Altimetry Mission [26] A. L. Neuenschwander... and decomposition retrieval algorithms for ICESat/GLAS data,[ Can. J. Remote Sens..., and K. Sherrill, BValidation of the ICEsat vegetation product using crown-area..., and A. L. Neuenschwander, BA Survey of ICESat coastal altimetry applications: Continental Coast... and D. J. Harding, BSRTM C-band and ICESat laser altimetry elevation comparisons as... ocean gravity field derived from ICESat and ERS-2 Altimetry: Tectonic implications... comparison of coincident GRACE and ICESat data over Antarctica,[ J. Geodyn., 2009...



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... Data in Preparation for the ICESat-2 Mission Ute Christina Herzfeld, Brian... and Land Elevation Satellite-II (ICESat-2) mission is a decadal survey mission... innovative components will characterize the ICESat-2 lidar: 1) collection of elevation data... and canopy levels in simulated ICESat-2 data, based on airborne observations... and exchange with the ICESat-2 Project, the ICESat-2 Science Definition Team and..., Cloud and Land Elevation Satellite (ICESat) mission (2003–2009) has resulted...], see also http://ICESat.gsfc.nasa.gov/publications). ICESat ceased operation in... the ICESat-2 mission has an ecosystem science requirement, stated as, “ICESat-2 shall...], it is expected that the ICESat-2 mission, operating continuously in a 91... vegetation science and for the ICESat-2 mission’s primary cryospheric objectives [2], [14.... Determination of vegetation height from ICESat-2 measurements will be based on..., because ICESat-2 will use a fundamentally different lidar than was used on ICESat... will characterize the ICESat-2 lidar compared to the ICESat mission: 1) collection of... proposed for ICESat-2 have been applied in airborne lidars. ICESat-2 will use a lidar with a center wavelength 532 nm, while ICESat used... analysis of laser pulses, whereas ICESat-2 will base altimeter measurements on... algorithm theoretical basis document for ICESat-2, but are written with a broad... under development for ICESat-2. In this paper, simulations of ICESat-2 ATLAS data... ICESat-2 is not analyzed here. B. Design Cases for a Multibeam Sensor for ICESat-2 Designs of a multibeam system discussed for ICESat-2 include a combination...+Research+Center; 2-10-2012). D. Simulated ICESat-2 Data Based on Airborne Sigma... higher signal photon density than ICESat-2 is expected to achieve. Therefore... geometrically and radiometrically to simulate ICESat-2. Observation flights were conducted at... noise photons. Our simulation generates ICESat-2 simulated datasets that vary with... center in our ICESat-2 simulated data. For each ICESat-2 simulated footprint, the... A. Martino, AtlasPerformance20100421.xls on the ICESat-2 website). Because of the canopy... the ATLAS radiometry model. Because ICESat-2 assigns all photon locations to... the beams considered for the ICESat-2 instrument. Intensity is quantified by... laser altimeter system (GLAS) aboard ICESat, and proceeds by matching along... data Fig. 1. Analysis concepts. (a) Simulated ICESat-2 lidar data. (b) Density of data... 1 m). In the analysis of simulated ICESat-2 datasets, the histograms are built... in the instrument panel for ICESat-2. Introduction of a flexible tracking rigidity... part of the prelaunch phase ICESat-2 project, validation datasets and instrument... will be collected during the ICESat-2 mission with a next-generation multibeam... for ICESat-2, whereas an alternative proposed nine-beam design for an ICESat... with a high accuracy during the ICESat-2 mission. A result relevant for instrument...-Science-Martino.pptx, presented at ICESat-2 Science Definition Team Meeting). To... used in ICESat-2 data simulations may change as the ICESat-2 instrument is... more closely resemble the expected ICESat-2 data. The analysis presented here... the ICESat-2 Science Definition Team (SDT) and members of the ICESat-2 project..., B. Smith, J. Spinhirn, and C. Webb, “The ICESat-2 laser altimetry mission,” Proc. IEEE..., D. Yi, and K. Brunt, “Description of ICESat-II simulated data created from..., Jan. 2000. [7] C. C. Carabajal and D. J. Harding, “ICESat validation of SRTM C-band digital... shelf grounding zone structure from ICESat laser altimetry,” Geophys. Res. Lett... ice cover: A pathfinder for NASA’s ICESat-2 spaceflight mission,” in Proc. IEEE...–3601. [19] D. J. Harding and C. C. Carabajal, “ICESat waveform measurements of within-footprint..., J. Sonntag, and J. Miller, “Comparison of ICESat data with airborne laser altimeter...] R. Kwok, G. F. Cunningham, H. J. Zwally, and D. Yi, “ICESat over arctic sea ice: Interpretation..., cloud, and land elevation satellite (ICESat) over arctic sea ice: Retrieval..., T. A. Williams, and M. Sirota, “Reduction of ICESat systematic geolocation errors and the... and decomposition retrieval algorithms for ICESat/GLAS data,” Can. J. Remote Sens..., and K. Sherrill, “Validation of the ICESat vegetation product using crown-area..., and J. P. DiMarzio, “Overview of the ICESat mission,” Geophys. Res. Lett., vol..., A. C. Brenner, J. P. DiMarzio, V. P. Suchdeo, and H. A. Fricker, “ICESat antarctic elevation data: Preliminary precision..., K. Quinn, S. Palm, J. Spinhirn, and R. Thomas, “ICESat’s laser measurements of polar ice...] H. J. Zwally, D. Yi, R. Kwok, and Y. Zhao, “ICESat measurements of sea ice freeboard...-sensing data analysis, especially for ICESat-2, innovative aerial and satellite observation... focuses on the development of ICESat-2, the next-generation laser altimeter... airborne ICESat-2 simulator to develop surface-finding algorithms and calibrating ICESat altimetry... is the Project Scientist for ICESat-2. His current research interests include...



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..., Cloud, and land Elevation Satellite (ICESat) provides a globally distributed elevation data... ............................................................................................................ 6 2 Data and Methodology ........................................................................................... 6 2.1 2.2 2.3 2.4 2.5 2.5.1 2.5.2 2.5.3 EU-DEM .................................................................................................................................... 6 ICESat Global Land Surface Altimetry Data... system. ......................................................................... 7 Figure 2. Overview map over ICESat paths and footprints over Western... al. 2005) .............................................. 24 Figure 15. ICESat waveform over forest canopy relative... al 2012). .................................................................................. 25 TABLES Table 1. ICESAT GLAH14 data quality flags................................................................................................. 8 Table..., Cloud and land Elevation Satellite (ICESat) employing the Geoscience Laser Altimeter... and ended late 2009. This ICESat/GLAS system provides a consistently referenced...-DEM vertical accuracy based on ICESat data. The validation results is... response to the tender process. 2.2 ICESat Global Land Surface Altimetry Data... locations in open terrain the ICESat data return elevation values with... several standard ICESat data products (cf. http://nsidc.org/data/icesat/data.html). For the EU-DEM validation GLAH14 (GLAS/ICEsat... applied to the ICESat data in order to select ICESat records with the highest possible accuracy and to exclude ICESat... in the ICESat GLAH14 data files (cf. Table 1). Table 1. ICESAT GLAH14 data... attributed to cloud contamination why ICESat locations with elevations deviating more... 2006 EEA, 2013 2.4 Data comparison ICESat GLA14 data contain land elevations... ellipsoid. As a consequence, comparison of ICESat elevations to those obtained from... the reference ellipsoid. First, the ICESat footprint locations were converted to... ellipsoids being equal . For every ICESat footprint the corresponding EU-DEM... were also extracted for each ICESat footprint including i.e. forest cover and... fundamental accuracy was evaluated using ICESat footprints located in open low... (NSIDC) - http://nsidc.org/data/icesat/ 2 Dr.-Ing. Heiner Denker (personal.... It is generally recognised that ICESat data after quality filtering achieve... relief locations (Carabajal 2011) and ICESat data therefore makes an adequate.... Figure 2). Figure 2. Overview map over ICESat paths and footprints over Western... the validation varies with the ICESat selection criteria which are being.... 2.5.3 Processing workflow The use of ICESat data requires working with millions... procedure was used to extract ICESat locations characterised with short or... returned closed to appr. 1 mio. ICESat records suitable for assessing the... EU-DEM and the selected ICESat elevations returns a distribution of errors... 60oN o The approximately 900.000 ICESat records available for the region... 60oN o The approximately 83.500 ICESat records available for the region... urban land cover as the ICESat footprint locations with o dense urban... process returned around 875.000. ICESat records with the majority located... from the EU-DEM and ICESat elevation difference follows a normal distribution... and longitude location of each ICESat footprint ** The tender specifications operated... process returned around 95.000. ICESat records for the region o north... and longitude location of each ICESat footprint ** The tender specifications operated... extract low relief (< 10 slope) ICESat locations with a forest cover percentage... ICESat records and the difference between EU-DEM and the selected ICESat... and longitude location of each ICESat footprint. 20 o Figure 10. Variability... extract low relief (< 10 slope) ICESat locations with a forest cover percentage... ICESat records and the difference between EU-DEM and the selected ICESat... and longitude location of each ICESat footprint o Figure 12. Variability of.... ICESat records and the difference between EU-DEM and the selected ICESat... longitude location of each ICESat footprint 4 Discussion The ICESat data archive provides... Points (GCPs) database from the ICESat records with sub-meter vertical... differences between EU-DEM and ICESat versus slope categories the RMSE... height of ICESat (cf. Figure 15). 24 Figure 15. ICESat waveform over... sources ASTER GDEM, SRTM and ICESat can be considered first reflective... ort.pdf Carabajal, C. C., & Harding, D. J. (2005). ICESat validation of SRTM C‐band digital... Global DEM version 2.0 evaluation using ICESat geodetic ground control. http://www... global digital surface models and ICESat heights at footprint geolocation. In..., D., & DiMarzio, J. P. (2005). Overview of the ICESat mission. Geophysical Research Letters, 32..., W., Abshire, J., Bentley, C., Brenner, A., ... & Thomas, R. (2002). ICESat's laser measurements of polar ice...