Imaging Radar Home Page
List of data that has been processed by JPL (Standard products).
This list will be updated periodically, and eventually you will be able to search for the lat/lon, or site name that you are interested in.
The following is a description of what this list means :
The SIR-C processor team produces two basic data products: survey and standard. For a description of the standard data format, see here.
The following list contains SIR-C standard data products are listed according to the processing date. The list will be updated every 3-4 weeks. SIR-C data is L-band 23 cm) and/or C-band (6 cm) data; X-SAR data s X-band (3 cm). See the DLR/X-SAR home page for information on X-SAR data.
A few warnings about this list:
1. Not all of the data listed are fully calibrated. Flight 1 data processed before September 22, 1994 are not fully calibrated; Flight 2 data processed before February 1, 1995 are not fully calibrated.
2. Not all of the data products listed are available for distribution. If a requested product is unavailable, the requester will be notified and asked to select an alternate product.
The list contains the following information.
Datatake Number
Identifies the orbit on which the data were collected. Note that many datatake numbers were used on both flights of SIR-C/X-SAR. See GMT Scene Center for how to distinguish between data from the two flights.
Site Name
This identifies the site at which a particular datatake was aimed. The site name is also the name associated with the survey data.
Scene Name
The scene name provides for additional identification of the standard data product. For example, if a datatake Site Name is "Duke Forest, North Carolina" but the pass covers all of the eastern United States, the scene chosen for standard processing might have a Scene Name of "Atlanta, Georgia" to distinguish it from other scenes processed along the same data pass.
GMT Scene Center
This is the Greenwich Mean Time (GMT) at the center of the standard scene. The GMT is read as follows:
1994/101:21:19:25
1994 is the year
101 is the day
21 is the hour
19 is the minute
25 is the second
The GMT Scene Center can be used to distinguish between flight 1 and flight 2 data products. Flight 1 went from GMT day 100 through 111
Flight 2 went from GMT day 274 through 285
The GMT can be used with the other information given to look at the survey data, posted on the WorldWideWeb. This allows a preview of the area shown in the standard data product. The GMT in the center of each survey segment is also in the dthdr.txt file that accompanies survey data for each datatake.
Latitude and Longitude at Scene Center (LatLon Center)
This is the latitude and longitude at the center of the standard scene.
Positive latitude is North
Negative latitude is South
Positive longitude is East
Negative longitude is West
This information is currently not listed for all products. We're working to correct this for future postings. However, as described above, the GMT Scene Center can be used to look at the survey data of the region processed.
Processing Date
This is the date on which the standard data product was produced.
L PR# and C PR #
These are the processing run numbers for the L-band data and the C-band data. Not all standard data products have both frequencies of data. One, or both, processing run numbers can be distributed for a standard data product.
PDT
Standard data products are described in terms of frames or scenes, where a frame or scene is a small portion of a complete datatake. Brief descriptions of the standard data formats are below; for more information on the formats see HTTP:// For information on obtaining the software needed to read the CEOS-formatted tapes, see HTTP://
This describes the type of data product as follows:
SLC = Single Look Complex
Full resolution, single look complex, deskewed, slant range image with natural pixel spacing, distributed on CEOS-formatted 5 Gbyte 8 mm tape. Frame size is 50 km (7.5 seconds) along track by the swath width. These products have the highest resolution and are intended for users who will calibrate the data themselves. Some of these data products are not calibrated.
MLC = Multilook Complex
MLD = Multilook Detected
Both MLC and MLD images are distributed on CEOS-formatted 5 Gbyte 8 mm tapes, multilook, complex polarimetric data, deskewed, ground range. Frame size is 100 km along track (~15 seconds) by the swath width.
GEO = Geocoded
Multi-look, CEOS-formatted frame image products. Images are 100 km square in UTM projection.
RSD = Reformatted Signal Data
SAR signal data, with radar, platform, and processing parameters, 8 bit unpacked and data window position (DWP) shifted data with original raw data header. Frame size is 100 km along track (~15 seconds) by the swath width.
INF = Interferometric SLC
CEOS-formatted data, frame image similar to SLC; the same Doppler parameters applied to repeat pass data; no along track Doppler drifts or azimuth deskew. No calibration parameters are applied to these data. Frame size is 50 km (~7.5 seconds) along track by swath width.
Imaging Radar Home Page