SPOT CAP

Long name	SPOT Image (CAP format)
Short name	SCP
Sensor type	Optical
Platform	SPOT
Key file name (use to open dataset)	imag_nn.dat, where nn is the scene number
Supported file name extensions	.dat
Sections	Data product name and description Distribution disk files Returned data for supported format References

Data product name and description

SPOT CAP digital products are produced and distributed by SPOT Image. The format is known as the "CAP" format, because it has been designed to be produced by the Centre d'Archivage et de Prétraitement (CAP) located at SPOT Image, Toulouse, France; SSCSatellitbild, Kiruna, Sweden; and SPOT Image Corporation, Reston, VA, U.S.A. Some direct-receiving stations can also provide data in CAP format.

SPOT 1, SPOT 2, SPOT 3, and SPOT 4 satellite images are distributed in SPOT CAP format.

The SPOT scene is the result of preprocessing applied to an input raw scene defined as follows:

In Panchromatic mode (P or M), one image 6000 lines by 6000 pixels
Or
In Multispectral mode (M) without SWIR (Xs), three registered images 3000 lines by 3000 pixels each
Or
In Multispectral mode (M) with SWIR (Xi), four registered images 3000 lines by 3000 pixels each

Corresponding auxiliary data is included.

Note: The information provided herein is based on the data distributor's documentation cited under References.

Spectral bands: Spectral range (nm)	Spatial resolution (m)* (spectral resolution)	Maximum image dimensions (Across track x along track, km)	Notes
XS1 (Green): 500-590 XS2 (Red): 610-680 XS3 (NIR): 790-890 SWIR (SWIR): 1580-1750 (SPOT 4) P (Panchromatic): 510-730	Panchromatic: 10 m by 10 m when the imaging direction is close to NADIR and 10 m by 13.6 m when the imaging direction corresponds to the extreme sidelook. Multispectral: 20 m when the imaging direction is close to NADIR, and 20 m by 27.2 m when the imaging direction corresponds to the extreme sidelook.	Panchromatic: 60 km along track and 60 km to 81.5 km across track. Multispectral: 60 km along track and 60 km to 81.5 km across track.	N/A

* Resolution is always nadir position unless noted otherwise.

SPOT CAP data is available in the product levels described in the following table.

Product level	Horizontal accuracy (m)	Description/notes
1A	N/A	Radiometric-equalization detector (modulation-transfer function (MTF) enhancement and optional digital dynamic stretching). No geometric correction.

Distribution disk files

SPOT CAP data sets are organized in a specific folder structure on disk. GDB uses this folder structure and the file names to identify the data product. Therefore, to preserve compatibility with GDB, do not alter the folder structure and file names when copying and decompressing the data.

You can open a SPOT CAP data set by selecting the imag_nn.dat file, where nn is the scene number.

When opening a SPOT CAP data set, the files read by GDB are as described in the following table.

File name	Format	Required	Contents/details
imag_nn.dat	Binary	Yes	Imagery file
vold_nn.dat	Binary	Yes	Volume directory file
lead_nn.dat	Binary	Yes	Leader file
trai_nn.dat	Binary	Yes	Trailer file
null_nn.dat	Binary	Yes	Null volume directory file

Returned data for supported format

SPOT CAP data can be opened directly in its raw vendor format or imported into a PCIDSK (*.pix) file using the key file name (imag_nn.dat). For optimal processing, use the PCIDSK format.

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

Data product	Data returned	Details
1A	SPOT 1, SPOT 2, SPOT 3: 3 x [8U] raster channels (multispectral) 1 x [8U] raster channel (panchromatic) 1 x [ORB] orbit segment SPOT 4: 4 x [8U] raster channels (multispectral) 1 x [8U] raster channel (panchromatic) 1 x [ORB] orbit segment	N/A

References

The SPOT Scene Standard Digital Product Format, S4-ST-73-01-SI Edition 1 - Revision 2 97/11/17, SPOT Image, France.

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