X-SAR Geocoded Terrain Corrected Data Product (GTC, held at DLR/DFD)
Entry ID:
DFD-X-SAR.SAR.GTC
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Summary
Abstract:
Mission Objective: Please see the relevant SIR-C/X-SAR Mission description contained in the references and as Supplementary Information for "sensor"(X-SAR). There were two Missions with the following time frame: - Space Shuttle Mission STS-59: Start_Date: 1994-04-09 Stop_Date: 1994-04-20 - Space ... Shuttle Mission STS-68: Start_Date: 1994-09-30 Stop_Date: 1994-10-11 Worldwide coverage and map prints are available on World Wide Web (see below). Data Set Content: The GTC data set contains a X-SAR detected image, represented in a uniform, preselected cartographic presentation. The image axes (i.e. the row and column direction of the pixels) are parallel to the cartographic coordinate system used. The cartographic system used for worldwide reference is the Universal Transversal Mercator System (UTM) . The SAR inherent geometric terrain distortions, which are introduced to SAR imagery due to actual terrain height and SAR-sidelooking geometry, will be restituted to the best possible degree, to achieve map reference even in regions of layover and shadow. Of course, the terrain height restitution, which is basically a resampling in range direction, can only be as exact as the Digital Elevation Model (DEM). The planimetric accuracy will depend on DEM accuracy. Accuracy for geocoded products means how well the geocoded product fits the map reference. The availability of DEM data will be the most restrictive impact on the generation of this product. Intended Use: Geocoded data will be available after availability of off-line processed precision products and the required DEMs. Geocoded data sets can be used by the scientific or commercial community which will refer the actual SAR data to geographic/cartographic places. Terrain corrected products are intended for applications where high absolute and relative geometric accuracy is required, even in hilly terrain. Input Data: - The standard MGD product formatted in GEOS, including parameters used for the slant to ground range projection. - Orbit data from the PATH tape annotated in the MGD product - Digital Elevation Model - Map projection constants to be applied Processing Algorithm: The geocoding is based on the same data as for ellipsoid correction geocoding except: - a precise digital elevation model (DEM) is used to set up the radargrammetric mapping function for each point on earth - azimuth timing information within the processor (i.e. The range line must be annotated with the zero-Doppler orbit time.) - the earth to image is computed for each point rather than for only a grid - no oversampling is applied - no radiometric correction is done due to terrain induced radiometric distortions (layover, foreshortening, shadow) A special GIM product will be available for follow-on investigations on this topic - some automatic/interactive tiepointing will be performed to enhance the overall geometric accuracy of the product Product Parameter: Equivalent no. of looks in azimuth 1 .5 - 2.5 in range 1 - 3 Geometric representation cartographic UTM ellipsoid use WG584 Data representation detected, amplitude pixel quantization 16 bit, signed integer Ground area covered range < 62.5 km Product orientation x-axis easting y-axis northing Spatial Resolution 25 m (determined by the MGD product) Absolute location error < 50 m (if the DEM used has a resolution of 25 m) Pixel spacing northing 12,5 m easting 12,5 m Number of pixels northing 8000 ... 8960 easting 4000 ... 8960 Image data volume up to 160 MBytes Access to the data: On-line access to data and information as well to digital quicklook DQL or browse data is provided by the Intelligent Satellite Data Information System (ISIS), developed by DLR as a client / server configuration. It represents the interface of DLR-DFD to users, providing easy access to catalogue-, inventory-, browse- and general textual information. ISIS can be accessed with World Wide Web by URL: http://www.dfd.dlr.de and clicking on `Information Services (ISIS)` or `Accessing ISIS` (telnet). ISIS can also be accessed by telnet directly: input: telnet isis.dfd.dlr.de user: dlrpid password: - Other procedures (modem or X-25) to access ISIS are described as 'Supplemen- tary Information' for data centers (keyword 'ISIS'. Access presumes the in- stallation of the client software (available free of charge) which can be easily done by users (supplied by DLR/DFD). Digital and photographic products may be ordered at DFD - Help Desk,see Data Center Contact. There is also available on CD-ROM and on Web a set of image sample products as well as general and specific information about the X-SAR missions. This 'user-kit' can be accessed via Web with URL: http://eoweb.dlr.de:8080/index.html
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: 70.0
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S: -70.0
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E: 180.0
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W: -180.0
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Temporal Coverage
Start Date:
1994-04-09
Stop Date:
1994-10-11
Data Resolution
Latitude Resolution:
25m
Longitude Resolution:
25m
Personnel
Role:
INVESTIGATOR
Phone:
+39-55-4796-269
Fax:
+39-55-4796-441
Contact Address:
Facolta D'Ingegneria
Via S. Marta, 3
City:
Firenze
Postal Code:
I-50139
Country:
Italy
Role:
TECHNICAL CONTACT
Phone:
+49-8153-281390
Fax:
+49-8153-281446
Email:
noack at dfd.dlr.de
Contact Address:
DLR/DFD Oberpfaffenhofen
Muenchner Str. 20
City:
Wessling
Postal Code:
D-82234
Country:
GERMANY
Role:
INVESTIGATOR
Phone:
+49-8153-28-2365
Fax:
+49-8153-281465
Contact Address:
DLR/DFD Oberpfaffenhofen
Muenchner Str. 20
City:
Wessling
Postal Code:
D-82234
Country:
GERMANY
Role:
DIF AUTHOR
Phone:
+49-8153-281400
Fax:
+49-8153-281343
Email:
schroete at dfd.dlr.de
Contact Address:
DLR/DFD Oberpfaffenhofen
Muenchner Str. 20
City:
WESSLING
Postal Code:
D-82234
Country:
GERMANY
Role:
TECHNICAL CONTACT
Phone:
+49-8153-28-2397
Fax:
+49-8153-281449
Contact Address:
DLR/DFD Oberpfaffenhofen
Muenchner Str. 20
Province or State:
WESSLING
Postal Code:
D-82234
Country:
GERMANY
Publications/References
NASA/JPL publication 93-29, "SIR-C/X-SAR Mission Overview", December 15, 1993 Schreier, G. , SAR Geocoding: Data and System Wichmann-Verlag, Karlsruhe, Germany, 1993 M. Zink, R. Bamler, "X-SAR Radiometric Calibration and Data Quality", IEEE Transactions on Geoscience and Remote Sensing, Vol. 33, 1995 ... Hartmut Runge, Helko Breit, Ulrich Steinbrecher, Mihai Datcu, "Higher Resolution X-SAR Images", IEEE International Geoscience and Remote Sensing Digest 1995. M. Eineder, R. Bamler, H. Breit, U. Steinbrecher, "X-SAR Data Quality - The Results of Two Missions", IEEE International Geoscience and Remote Sensing Digest 1995. R. Bamler, M. Eineder, H. Breit, U. Steinbrecher, "X-SAR Data and Image Quality", IEEE International Geoscience and Remote Sensing Digest, 1994, pp. 1175-1177. Richard Bamler, "Wavelength Diversity PRF-Ambiguity Resolver : Calibration and Test for ERS-1 SAR", IEEE International Geoscience and Remote Sensing Digest 1993. Richard Bamler, Dieter Just, "Phase Statistics and Decorrelation in SAR Interferograms", Remote Sensing Digest 1993. Richard Bamler, Helko Breit, Ulrich Steinbrecher, Dieter Just, "Algorithms for X-SAR Processing", Remote Sensing Digest 1993. H. Runge, "The German Processing and Archiving Facility for X-SAR", EUSAR '96, Koenigswinter, Germany, 1996
Creation and Review Dates
Last DIF Revision Date:
2008-09-29
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