Long name | UMBRA |
Short name | UMBR |
Sensor type | Synthetic-aperture radar (SAR) |
Platform | UMBRA |
Frequency | 9.8 GHz (nominal) |
Band (wavelength) | X-band wavelength |
Polarization | HH, VV |
Key file name (use to open data set) | *.json |
Supported file name extensions | *.json, *.tif, *.nitf |
Data distributor | https://umbra.space/ |
Sections |
Data product name and description |
Data product name and description
Umbra is developing synthetic aperture radar (SAR) microsatellites to deliver sub-meter resolution imagery as a service. Umbra's satellites produce X-band synthetic aperture radar data which can be dissected into two constituent properties: amplitude and phase and can be acquired in either right or left looking configurations. The Umbra SAR sensor are as described in the following tables.
Mode | Swath width (km) | Resolution (range x azimuth, m) | Polarization | Description/notes |
---|---|---|---|---|
Spotlight |
4km x 4km |
0.25m – 1.0m ground plane IPR |
Single Pol |
System Design Life: 5 years |
The data products Umbra delivers are listed below. These are published standards adopted by National Geospatial-Intelligence Agency (NGA) of the U.S. government.
Product | Processing level | Description |
---|---|---|
CPHD - |
L1 |
For advanced users with radar science expertise and strong opinions about image formation techniques, CPHD offers a blank slate to start from. |
SICD - |
L1 ~ L1A(SLC) |
Phase information is determined by the distance from the satellite to the reflecting surface. |
SIDD - |
1C (GEC) |
SIDD Design provides metadata specifications for common tasks which are designed to support basic exploitation, geographic measurements, exploitation, and proper visual display. |
GeoTIFF - |
1C (GEC) |
The characteristic black-and-white images commonly associated with SAR are amplitude products. Amplitude data can be used for mapping features on the ground, measuring surface roughness, or even basic change detection. |
Umbra SICD data is distributed in NITF format and GEC data 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 |
---|---|---|---|
*.json | JavaScript Object Notation | Yes | Key file name. Main product annotation file. |
*.nitf | National Imagery Transmission Format | Yes | For SICD data, includes image data and xml metadata |
*.tif | GeoTIFF | Yes | For GEC data |
Returned data for supported format
Umbra data can be opened directly in its raw vendor format or imported into a PCIDSK (*.pix) file using the key file (*.json). For optimal processing, use the PCIDSK format.
In the following table, the data structure after it is imported is described (supported processing levels only).
Data product | Data returned | Details |
---|---|---|
SICD |
1 x [C32R] raster channel (calibrated to sigma nought) |
Data can be converted to beta, or gamma nought. |
GEC |
1 x [8U] raster channel |
[1] 20230515 UMBRA Product Guide - V1.pdf
[2] NGA.STND.0024-1_1.2.1_SICD_DID_2018_12_13.pdf
[3] NGA.STND.0024-2_1.2.1_SICD_NITF_FFD_2018_12_13.pdf
[4] NGA.STND.0024-3_1.2.1_2018-12-13.pdf
[5] Geotiff specification http://www.alternatiff.com/resources/TIFF6.pdf
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