Long name | Unmanned Aerial Vehicle Synthetic-Aperture Radar (UAVSAR) Polarimetric |
Short name | UAV |
Sensor type | Synthetic-aperture radar (SAR) |
Platform | Unmanned Aerial Vehicle (Gulfstream-III) |
Frequency | 1.26 GHz |
Band (wavelength) | L (23.79 cm) |
Polarization | HH, HV, VH, VV (Fully polarimetric) |
Key file name (use to open data set) | *.ann, *.dat |
Supported file extensions | *.ann, *.mlc, *.dat, *.grd, *.hgt |
Data distributor | National Aeronautics and Space Administration (NASA) |
Sections |
Data product name and description |
Data product name and description
UAVSAR is a fully polarimetric (PolSAR) sensor mounted on and unmanned aerial vehicle (UAV) and operating at various altitudes.
Mode | Swath width (km) | Resolution (range x azimuth, m)* | Polarization | Description/notes |
---|---|---|---|---|
PolSAR | ≈16 | ≈2.2 x 0.6 (SLC) |
Quad (HH + HV + VH + VV) | Swath width and resolution values are indicative only; values may differ significantly among data sets. |
UAVSAR PolSAR data sets are available for various processing levels, as described in the following table.
Processing level | Acquisition mode | Description/notes |
---|---|---|
Calibrated single-look complex (SLC) products |
PolSAR | The projection of the data is in the natural slant-range projection. The four complex SLC files correspond to the measurement of the scattering matrix: Shh, Shv, Svh, Svv.
The units of the data are linear radar amplitude (instead of dB units). |
Calibrated multi-look complex (MLC) products |
PolSAR | The MLC product corresponds to a symetrized-covariance matrix derived from the average of the SLC product (typically three pixels in range, and 12 pixels in azimuth) corresponding to:
The projection of the data is in the natural slant-range projection. The units of the data are linear radar power (instead of dB units). |
Calibrated complex cross-products projected to the ground in simple geometric coordinates (GRD) |
PolSAR | The GRD files contain projected multi-looked data for cross-products: ShhShv*, ShhSvv*, ShvSvv*, ShhShh*, ShvShv*, SvvSvv* in linear power units (instead of dB).
The data is in an equiangular-coordinate system in which each line and pixel increments in latitude and longitude. Data is projected to ground range and coregistered to the height file (HGT). The HGT file contains the elevation values used to project the slant-range data to the surface of the Earth. The value of the ground elevation is provided in meters. |
Compressed Stokes matrix products (DAT) |
PolSAR | Compressed Stokes matrix product (.dat): AIRSAR compressed Stokes matrix format for software compatibility.
One data file. |
A UAVSAR PolSAR data set includes a variety of files, as described in the following table.
File name | Format | Required | Contents/details |
---|---|---|---|
*.ann | ASCII | Yes | Key file name. Annotation file. Contains metadata that applies to the data set. |
*.slc | Binary | Yes/no | Image data file.
Four of the files are complex floating-point format, 8 bytes per pixel, corresponding to the scattering matrix. |
*.mlc | Binary | Yes/no | Image data file.
Three of the files are complex floating-point format, 8 bytes per pixel, for two polarizations floating-point values (I and Q) per MLC pixel. Three of the files are real floating point, 4 bytes per pixel. |
*.dat | Binary | Yes/no | Image data file.
AIRSAR compressed Stokes matrix format. |
*.grd | Binary | Yes/no | Image data file.
The grid files consist of three real floating-point files, 4 bytes per pixel, and three complex floating-point files, 8 bytes per pixel. |
*.hgt | Binary | Yes/no | Image data file.
The height file is a pure binary real*4 floating-point file containing elevation values. |
Typically, you download UAVSAR PolSAR data from the UAVSAR (NASA-JPL) website.
For example:
EASI> FILI = path/filename.ann-MLC—or—
EASI> FILE = path/filename.ann-SLC—or—
EASI> FILI = path/filename.ann-DAT—or—
EASI> FILE = path/filename.ann-GRDReturned data for supported format
GDB support of UAVSAR data is read-only; you cannot write imported UAVSAR data. When you open or import an available processing level by using the annotation file (*.ann), the structure of the returned data is as described in the following table.
Data product | Data returned | Details |
---|---|---|
Single-look complex (SLC) | 4 x [C32R] Raster channels |
Data calibrated in sigma nought and can also be calibrated in beta or gamma nought. |
Calibrated multi-look cross-products (MLC) |
3 x [32R] Raster channels |
Data calibrated in sigma nought and can also be calibrated in beta or gamma nought. |
Calibrated complex cross-products projected to the ground in simple geographic coordinates (GRD) |
3 x [32R] Raster channels |
Data calibrated in sigma nought.
Note: When ingesting the data, the CALIBTYPE parameter must be set to None.
|
Compressed Stokes matrix product (DAT) |
3 x [32R] Raster channels |
Data calibrated in sigma nought and can also be calibrated in beta or gamma nought. |
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