Long name | SAOCOM |
Short name | SAOC |
Sensor type | Synthetic-aperture radar (SAR) |
Platform | SAOCOM 1A, SAOCOM 1B |
Frequency | 1.275 GHz |
Band (wavelength) | L (23.513 centimeters) |
Polarization | HH, HV, VH, VV, RH, RV, LH, LV |
Key file name (use to open data set) | *.xemt |
Supported file name extensions | *.xml, *.tif, *.png, *.kml, *.txt |
Data distributor | Comision Nacional de Actividades Espaciales(Buenos Aires) and ARESYS(Milan) |
Sections |
Data product name and description |
Data product name and description
The acquisition modes of the SAOCOM SAR sensor are as described in the following tables.
The data can be acquired in either right or left looking configurations.
Mode | Swath width (km) | Resolution (range x azimuth, m) | Polarization | Description/notes |
---|---|---|---|---|
StripMap[SM] |
31 ~ 55 depending on beam mode |
10m x 5m (L1A) |
Single Pol |
There are 9 beam modes (S1-S9) with incident angles ranging from 20-50 degrees. |
StripMap[SM] |
14 ~ 29 depending on beam mode |
10m x 6m(L1A) |
(HH + HV + VH + VV) |
There are 10 beam modes (S1-S10) with incident angles ranging from 17-35 degrees. |
TOPSAR |
150 ~ 176 depending on beam mode |
10m x 30m(L1A) |
Single Pol |
There are 2 beam modes (TNA and TNB) with incident angles ranging from 24-38 degrees for TNA and 38-47 degrees for TNB. |
TOPSAR |
108 TNA 110 TNB |
10m x 50m(L1A) |
(HH + HV + VH + VV) |
There are 2 beam modes (TNA and TNB) with incident angles ranging from 17-27 degrees for TNA and 27-35 degrees for TNB. |
TOPSAR |
354 |
10m x 50m(L1A) |
Single Pol |
There is 1 TW beam mode with incident angles ranging from 24-49 degrees. |
TOPSAR |
218 |
10m x 100m(L1A) |
(HH + HV + VH + VV) |
There is 1 TW beam mode with incident angles ranging from 17-35 degrees. |
SAOCOM data sets are available for various processing levels, as described in the following table.
Processing level | Acquisition mode | Description/notes |
---|---|---|
L1A |
[SM], [TN], [TW] | The SLC product is provided as complex (I and Q) values in slant range. The product is radiometrically calibrated to sigma nought without geometric corrections. The pixel spacings are constant in the slant range (X) and azimuth (Y) directions. |
L1B |
[SM], [TN], [TW] |
The GRD product is provided as detected amplitude, reprojected to nominal ground range at zero elevation. The data is radiometrically calibrated and georeferenced. |
SAOCOM data sets (SLC, GRD) are distributed in GeoTIFF format.
Warning: Data sets for this sensor are organized in a specific folder structure on disk. GDB uses this structure and the file names to identify the data product type. Do not alter the folder structure or any file names prior to data ingestion to ensure the image data and auxiliary information are imported correctly.
File name | Format | Required | Contents/details |
---|---|---|---|
*.xemt | Extensible Markup Language | Yes | Key file name. Main product annotation file. |
*.xml | Extensible Markup Language | Yes | Schema and description of metadata |
*.tif | GeoTIFF | Yes | Image data. One GeoTIFF file per polarization. (DATA folder) |
*.png | Portable network graphic | No | Thumbnail of image (IMAGE folder) |
*.kml | Keyhole Markup Language | No | Google Earth Overlay (IMAGE folder) |
Returned data for supported format
SAOCOM data can be opened directly in its raw vendor format or imported into a PCIDSK (*.pix) file using the key file (*.xemt). For optimal processing, use the PCIDSK format.
In the following table, the data structure after it is imported into a PCIDSK file is described (supported processing levels only).
Data product | Data returned | Details |
---|---|---|
L1A |
|
Data can be converted to beta, or gamma nought. |
L1A |
|
Data can be converted to beta, or gamma nought. |
L1A |
|
Data can be converted to beta, or gamma nought. |
L1B |
|
Data can be converted to beta, or gamma nought. |
L1B |
|
Data can be converted to beta, or gamma nought. |
L1B |
|
Data can be converted to beta, or gamma nought. |
[1] Ministerio de Ciencia, Tenologia e Innovacion,(CONAE), SAOCOM-1 Level-1 Products Format, January 13, 2020
[2] Geotiff specification http://www.alternatiff.com/resources/TIFF6.pdf
[3] GeoTIFF Format Specification GeoTIFF Revision 1 http://geotiff.maptools.org/spec/geotiffhome.html
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