ZY3-2

Long name	ZY3-2
Short name	ZY32
Sensor type	Three-line camera array and multispectral camera
Platform	ZY3-2
Key file name (use to open dataset)	*.xml
Supported file name extensions	.xml, .tif (or .tiff), .rpc (or .rpb) and .jpg
Sections	Data product name and description Distribution disk files Returned data for supported format References

Data product name and description

The ZY3-2 satellite carries a three-line camera array and a multispectral (MS) camera. The three-line panchromatic (PAN) camera array acquires stereoscopic imagery consisting of three telescopic cameras. The first is oriented to the nadir and the other two are each offset by 22 degrees forward and backward in the direction of flight. This stereo-mapping camera has a resolution of 2.1 meters for the nadir camera, and 2.6 meters for the offset cameras. The swath width is 51 kilometers. The multispectral imager for environmental and vegetation monitoring consists of a three-mirror telescope and a cooled detector system sensitive to four wavelength bands to capture full-color imagery and near-infrared (NIR) data. The ground resolution of this system is 5.8 meters.

Spectral bands: Spectral range (nm)	Spatial resolution (m)* (spectral resolution)	Maximum image dimensions (Across track x along track, km)	Notes
MS1 (Blue): 450 - 520 MS2 (Green): 520 - 590 MS3 (Red): 630 - 690 MS4 (NIR): 770 - 890 PAN (Panchromatic): 500 - 800	Nadir: 2.1 x 2.1 Backward: 2.6 x 2.6 Forward: 2.6 x 2.6 Multispectral: 5.8 x 5.8	Swath width: Nadir camera: 51 Forward/backward camera: 52 MS 51 (at nadir)	N/A

* Resolution is always nadir position unless noted otherwise.

ZY3-2 image data is available at one processing level: STANDARD. All products are provided with an XML metadata file specific to each. Each data set is either in its own directory or several data sets in one directory.

You can open a ZY3-2 data set by selecting the *.xml file.

When opening a ZY3-2 data set, the files read by GDB are as described in the following table.

Processing level	Horizontal accuracy (m)	Description/notes
STANDARD	N/A	N/A

Distribution disk files

A ZY3-2 data set is organized in a specific folder structure on disk. GDB uses this folder structure and the file names to identify the data product type.

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.

You can open a ZY3-2 data set by selecting the *.xml.

When opening a ZY3-2 data set, the files read by GDB are as described in the following table.

File name	Format	Required	Contents/details
*.xml	Extensible Markup Language	Yes	Key file name, contains data-set metadata
.tiff or .tif	GeoTIFF	Yes	Image data
*.rpc	ASCII	Yes	Rational-function model
*.jpg	Joint Photographic Experts Group	Optional	Thumbnail

Returned data for supported format

The data structure after it is opened by GDB is described in the following table.

Data product	Data returned	Details
MUX (Multispectral)	4 x [16U] raster channels 1 x [ORB] Orbit segment 1 x [BIN] Rational-function model 1 x [TXT] Product annotation	N/A
NAD BWD FWD (PAN)	1x [16U] raster channel 1 x [ORB] Orbit segment 1 x [BIN] Rational-function model 1 x [TXT] Product annotation

References

For more information, visit: eoportal.org