CDQB

Description

CDQB reads QuickBird, WorldView-1, and WorldView-2 imagery from a TIFF- or NITF-format CD when satellite orthorectification is required. CDQB automatically creates a PCIDSK file, reads all the requested imagery channels from CD, and saves the satellite path information to a segment. The output file from CDQB is used as input to CATALYST Professional OrthoEngine.

Parameters

Name	Type	Length	Value range
QuickBird/WorldView file name*	String	1 -
Output: Output file name*	Raster port	1 -
OutputOrbit: Satellite orbital ephemeris layer*	ORB port	1 - 1
OutputRPC: Rational Function layer*	BIN port	1 - 1
CD input layer(s) list	Integer	0 - 8	1 -
File description	String	0 - 1
Report	String	0 - 192	See parameter description

* Required parameter

Parameter descriptions

QuickBird/WorldView file name

Specifies the full path and file name of the input product image file.

Output: Output file name

Specifies the name of the PCIDSK file that will receive the processed data. The output file is created automatically and must not already exist.

OutputOrbit: Satellite orbital ephemeris layer

Specifies the name of the output file that will contain the output satellite orbital ephemeris layer.

OutputRPC: Rational Function layer

Specifies the output Rational Function layer that describes the math model of the image.

CD input layer(s) list

Specifies the list of channels to read from the CD. Up to 16 channels may be specified.

For each channel, a corresponding channel is created in the output PCIDSK file. Duplicate channels are NOT allowed.

If this parameter is not specified, all channels are transferred.

File description

Optionally specifies a line of text that describes the file. Typically, this contains information that identifies the location of the data and the CD reference number.

Report

Specifies where to direct the generated report.

Available options are:

• LOG: generates a report on the terminal (default)
• <modulename.RPT>: appends a report to the module's RPT file
• DISK: generates a report on file "IMPRPT.LST"

Details

CDQB is part of the satellite orthorectification component. It reads both QuickBird and WorldView (WorldView-1 and WorldView-2) data sets in TIFF or NITF format when satellite orthorectification is required. The corresponding metadata file must also exist in the same directory. CDQB automatically creates a PCIDSK file, reads all the requested imagery channels from CD, and saves the satellite path information in a segment.

CDQB extracts the geographic coordinates from the CD on the scene center and on the 4 corner points. The values are stored in the output orbit segment. These points can be used as ground control point (GCP) input for an approximate correction, which is useful when GCPs are unavailable for an area. Note, however, that using geographic coordinates may not produce very accurate results.

References

Toutin, Th. "Analyse math\u00c3\u00a9matique des possibilit\u00c3\u00a9s cartographiques du syst\u00c3\u00a8me SPOT". Th\u00c3\u00a8se de Docteur-Ing\u00c3\u00a9nieur en Sciences G\u00c3\u00a9od\u00c3\u00a9siques, ENSG, Paris, France, 1985.

Toutin, Th. and Carbonneau Y. "La multi-st\u00c3\u00a9r\u00c3\u00a9oscopie pour les corrections d'images SPOT-HRV", Canadian Journal of Remote Sensing, Vol. 15, No. 2 (September 1989) p110. (Also available in English from the Canada Centre for Remote Sensing.)