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

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