ASTER User's Guide - NASA

More documents

Recommendations

Info

ASTER Users HandbookProduced on-demand at ECS-EDAAC1. ASTER On-Demand Level-2 Decorrelation Stretch Product (VNIR) AST_06VD2. ASTER On-Demand Level-2 Decorrelation Stretch Product (SWIR) AST_06SD3. ASTER On-Demand Level-2 Decorrelation Stretch Product (TIR) AST_06TD4. ASTER Level-2 Brightness Temperature at the Sensor AST_045. ASTER Level-2 Emissivity Product AST_056. ASTER Level-2 Surface Reflectance Product (VNIR & SWIR) AST_077. ASTER Level-2 Surface Kinetic Temperature Product AST_088. ASTER Level-2 Surface Radiance Product (VNIR & SWIR) AST_099. ASTER Level-2 Surface Radiance Product (TIR) AST_09T10. ASTER Polar Surface & Cloud Classification AST13POLLevel-3 productsA. Produced on-demand at ECS-EDAAC1. Digital Elevation Model Product AST14DEMYou can order any of these products using the ASTER On-Demand Gateway.How do I get a DEM generated from ASTER data for my area?ASTER DEM’s can be produced as an on-demand product through the EDG website. You mustfirst search for Level-1A data, then follow the link next to the granule ID. Please note that ourproduction rate is 1-2 DEM’s per day, so there is a queue of several months.Are the DEM’s absolute or relative?Both absolute and relative DEM’s can be ordered. For absolute DEM’s you need to provide acontrol point.What is the difference between a Relative DEM and an Absolute DEM?An Absolute ASTER DEM is generated by using Ground Control Points (GCP) supplied by therequestor. The software uses the GCPs to tie the DEM to known points on the ground and yieldsa product with real ground elevations. The Absolute DEM is geo-coded using customer-suppliedGround Control Points (GCPs).A Relative ASTER DEM is generated by using only the satellite ephemeris data and will yield aproduct with ground elevations that are quite near those of an Absolute DEM. The Relative DEMis not nearly as accurate as the Absolute DEM horizontally since the Relative DEM is geo-codedusing only satellite ephemeris data.Why are some ASTER DEMs approximately 12 Mb in size and some others areapproximately 25 Mb in size?82
ASTER Users HandbookThere was a change in the ASTER DEM output format from a 16-bit to a 32-bit file in late-January, 2002. Hence, all ASTER DEMs processed on or after 22 January 2002 will beapproximately 25 Mb in size compared to the DEMs produced prior to that date, which areapproximately 12 Mb in size.How can I determine if the ASTER image is a good candidate for DEM production?You can execute your search with 2 Product Specific Attributes, “Cloud Amount”, and “BandAvailability” to ensure you have a suitable image with the requisite bands (3n and 3b) present. Itis highly recommended that you view the browse image to verify cloud areas. The best candidatefor DEM production would be cloud-free, and would have sufficient contrast in it’s imagevalues. A DEM can be produced from an image with clouds, however the clouds and their darkshadows on the image will be shown as a “void area” or a “no data” area on the DEM. Boththick, and high wispy clouds will cause void areas in a DEM and will also cause data near theclouds to be inaccurate. Areas of constant tone, such as large sand areas or snowfields, may alsocause failure in the resulting data.How can I tell the difference between an Absolute and a Relative DEM on the EDG?While viewing a list of the returned results of DEM granules on the EDG, one of the columnsprovides a link called “Granule Attributes.” Click on that link to view additional information onthe DEM including whether it is an absolute or a relative DEM.How do I get the surface reflectance from the ASTER 1B data?The ASTER team provides a reflectance product that can be ordered when the 1B data areordered. However, there are problems with crosstalk from band 5 to band 9. The problem isunder investigation.How do I get temperature and emissivity from ASTER 1B data?The ASTER team provides a temperature and emissivity product that can be ordered when the1B data are ordered.13.7 ASTER Expedited Data SetsWhat is an ASTER Level-1 Expedited Data Set (EDS)?The Expedited ASTER Level-1A data set is produced with the express purpose of providing theASTER Science Team members data of their particular interest in quick turn-around time fromthe moment the data are acquired. This is usually done to support on-going field calibration andvalidation efforts or to support emergency response to natural disasters when processed Level-1data with minimum turn-around time would prove beneficial in initial damage or impactassessments. This data set is expected to be publicly available for a period of 30 days afterwhich time it will be removed from the archive. This is done because the routinely processed83
Page 2 and 3:
ASTER Users HandbookASTER UserHandb
Page 4 and 5:
ASTER Users HandbookTable of Conten
Page 6 and 7:
ASTER Users HandbookTable of Figure
Page 8 and 9:
ASTER Users Handbook1.0 Introductio
Page 10 and 11:
ASTER Users HandbookSubsystemVNIRSW
Page 12 and 13:
Precise orbit for image focussing a
Page 14 and 15:
ASTER Users HandbookThe scanning mi
Page 16 and 17:
3.0 ASTER Level-1 DataThe ASTER ins
Page 18 and 19:
Figure 6: End-to-End Processing Flo
Page 20 and 21:
ASTER Level-1A Users Handbook Data
Page 22 and 23:
ASTER Users HandbookASTER Level-1B
Page 24 and 25:
ASTER Users Handbook4.0 ASTER Highe
Page 26 and 27:
equal to integrating their Christia
Page 28 and 29:
ASTER Users HandbookParameterVersio
Page 30 and 31:
ASTER Users Handbook• One-time co
Page 32 and 33: ASTER Users HandbookFigure 9: Openi
Page 34 and 35: ASTER Users Handbook3: Primary Data
Page 36 and 37: ASTER Users HandbookFigure 13: Data
Page 38 and 39: ASTER Users HandbookFigure 15: Choo
Page 40 and 41: ASTER Users Handbook9.0 ASTER Highe
Page 42 and 43: ASTER Users HandbookFigure 17: Cupr
Page 44 and 45: ASTER Users HandbookFigure 19: ASTE
Page 46 and 47: ASTER Users Handbook156 km 3 . The
Page 48 and 49: ASTER Users Handbookwind direction,
Page 52 and 53: ASTER Users HandbookFigure 26: Near
Page 54 and 55: ASTER Users Handbook12.0 Geo-Refere
Page 56 and 57: ASTER Users Handbook12.3 ASTER Leve
Page 60 and 61: ASTER Users HandbookOBJECT = Dimens
Page 62 and 63: ASTER Users Handbook13.0. Frequentl
Page 64 and 65: ASTER Users Handbookcorrection coef
Page 66 and 67: ASTER Users Handbook15: Production
Page 68 and 69: ASTER Users HandbookASTER Level-1 (
Page 70 and 71: ASTER Users Handbookoverpass then y
Page 72 and 73: ASTER Users HandbookImagePixelDimen
Page 74 and 75: ASTER Users HandbookProjection Para
Page 76 and 77: ASTER Users HandbookBlackbody Tempe
Page 78 and 79: ASTER Users HandbookOuter G-RingHol
Page 80 and 81: ASTER Users HandbookSensor (Bands)
Page 84 and 85: ASTER Users Handbook(Production Dat
Page 86 and 87: ASTER Users HandbookY. YAMAGUCHI, H
Page 88 and 89: ASTER Users HandbookASTEROPERATIONM
Page 90 and 91: ASTER Users HandbookOFFSET4= -0.217
Page 92 and 93: ASTER Users HandbookAVGCORRELCOEF9=
Page 94 and 95: ASTER Users HandbookCORINTEL14= "Co
Page 96 and 97: ASTER Users HandbookDecorrelation S
Page 98 and 99: ASTER Users HandbookBrightness Temp
Page 100 and 101: ASTER Users HandbookSurface Reflect
Page 103 and 104: ASTER Users HandbookSurface Radianc
Page 105 and 106: ASTER Users HandbookSurface Radianc
Page 107 and 108: ASTER Users HandbookSurface Emissiv
Page 109 and 110: ASTER Users HandbookSurface Kinetic
Page 111 and 112: ASTER Users HandbookThis ASTER pola
Page 113 and 114: ASTER Users Handbookresearch includ
Page 115 and 116: ASTER Users HandbookAttribute Namef
Page 117 and 118: ASTER Users Handbookformatted_produ
Page 119 and 120: ASTER Users HandbookAttribute Name
Page 121 and 122: ASTER Users Handbooklevel_1_carryov
Page 123 and 124: ASTER Users HandbookAttribute Name
Page 125 and 126: ASTER Users Handbooklevel_1_carryov
Page 127 and 128: ASTER Users Handbookformatted_produ
Page 129 and 130: ASTER Users HandbookUTMZONECODE13 l
Page 131 and 132: ASTER Users HandbookAppendix IV: Pu
Page 133 and 134:
ASTER Users HandbookAppendix V: LP-
Page 135:
ASTER Users HandbookDATA CENTER Def
show all

ASTER User's Guide - NASA

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?