Spacety

Sensor type	Synthetic-aperture radar (SAR)
Platform	Spacety
Frequency	5.4 GHz
Band	C
Polarization	VV
Key file name (use to open data set)	*.xml or manifest.safe (Only use manifest.safe to open the data if the data folder has the subfolders "annotation", "measurement", and "preview.")
Supported file name extensions	.xml, .safe (for SAFE format), .tiff, .png
Data distributor	Spacety, officially called Changsha Tianyi Space Science and Technology Research Institute Co. Ltd.
Sections	Data product name and description Distribution disk files Returned data for supported format References

Data product name and description

Spacety is developing a commercial SAR constellation TY-MINISAR made of 96 miniaturized and light-weight SAR satellites distributing in five sub-constellations with different inclinations.
The constellation provides extremely cost-effective SAR data services. Combining the inherent high resolution of our SAR technology, our SAR satellite constellation delivers high quality images with a fast revisit while providing a wide geographic coverage.

Note: The information provided herein is based on the Spacety product documentation cited under References.

Mode	Swath width (km)	Resolution (range x azimuth, m)	Polarization	Description/notes
StripMap[SM] Single Pol	24 x 24	3.0m	Single Pol VV	In StripMap mode the antenna is configured to produce radar beams with fixed azimuth and elevation pointing scanning along the flight direction. This leads to uninterrupted ground coverage with continuous image quality and resolution in the azimuth direction. HiSea-1 achieves a spatial resolution of 3.0 m and a standard scene size of 20 km × 20 km (width × length) in the Level-1 SAR products. The maximum acquisition length (azimuth direction) is extendable up to 840 km.
Spotlight[SP] Single Pol	5 x 5	1.0m	Single Pol VV	The Spotlight imaging mode takes full advantages of capabilities of the active phases array antenna equipped on the HiSea-1 satellite. In the SP mode the SAR instrument steers phased array beam in the azimuth plane to increase the integration time over a single target on the ground. The Spotlight mode of the HiSea-1 satellite provides the Level-1 SAR images with a spatial resolution of 1.0 m and a standard swath width of 5 km × 5 km.
ScanSAR[NS, ES] Single Pol	50 x 50 for Narrow ScanSAR mode 100 x 100 for Extra ScanSAR mode	10.0m (NS) 20.0m (ES)	Single Pol VV	HiSea-1 operates in two ScanSAR imaging modes: the Narrow ScanSAR (NS) mode and the Extra ScanSAR (ES) mode. The NS mode provides the Level-1 SAR images of a spatial resolution of 10 m and a standard scene size of 50 km × 50 km. The ES mode obtains the Level-1 SAR products with a spatial resolution of 20 m and a standard swath width of 100 km × 100 km.

Spacety data sets are available for various processing levels, as described in the following table.

Processing level	Acquisition mode	Description/notes
L1 Single-look, slant range, complex (SLC)	[SM], [SP]	The SLC product is provided as complex (I and Q) values in slant range. The pixel spacings are constant in the slant range (X) and azimuth (Y) directions.
L2 Orthorectified and Geocoded, ground range (ORG)	[SM], [SP], [NS\|ES]	The ORG products are projected and resampled products. In addition, the ORG products have been geocoded and terrain corrected using an external digital elevation model (DEM) thereby showing increased pixel location accuracy.

Distribution disk files

Spacety data sets (SLC, ORG) are distributed in GeoTIFF format.

Warning: Data sets for this sensor are organized in a specific folder structure on disk. SPID 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
*.xml	Extensible Markup Language	Yes	Key file name. Main product annotation file.
*.tiff	GeoTIFF	Yes	Image data. One GeoTIFF file per polarization.
*.xml	Calibration factor data	Yes	Only for SLC data product. Look up table for Sigma, beta and gamma calibration factor data.
*.safe	Manifest file	Yes/No	It is mandatory to use as the key file when data is privided as SAFE format (that is, if the data folder has the subfolders "annotation", "measurement", and "preview."), otherwise it is optional.
*.png	Portable network graphic	No	Quick look data of image.
*.kml	Keyhole Markup Language	No	Map-overlay - google Earth Overlay.
*.html	HyperText Markup Language	No	Product preview.

Returned data for supported format

In the following table, the image dataset after it is imported into a PCIDSK file is described.

Data product	Data returned	Details
L1 - SLC (single pol VV)	1 x [C32R] raster channel (calibrated to type selected by user during running data ingest) 1 x [GCP] Ground control points 1 x [BIN] rational function model from state vectors 1 x [ARR] incidence angle array	Data can be converted to beta, sigma or gamma nought.
L1 - SLC (single pol VV)	1 x [C16S] raster channel (Uncalibrated complex) 1 x [GCP] Ground control points 1 x [BIN] rational function model from state vectors 1 x [ARR] incidence angle array
L2 - ORG (single pol VV)	1 x [32R] raster channel

References

[1] Spacety_SAR_Product_Guide_v1.1.pdf

[2] TYSAR Satellite Image Product Brochure V1.1.pdf

[3] GeoTIFF Format Specification GeoTIFF Revision 1 http://geotiff.maptools.org/spec/geotiffhome.html