CDOV

Description

CDOV reads an OrbView-format CD for orthorectification. CDOV automatically creates a PCIDSK file, reads all the requested imagery channels from CD, and saves the satellite path or RPC information in a segment.

Parameters

Name	Type	Length	Value range
TIFF/NITF File Name *	String	1 -
Output: Output file name *	Raster port	1 -
OutputOrbit: Output satellite orbital ephemeris layer	ORB port	0 - 1
OutputRPC: Output satellite orbital ephemeris layer	ORB port	0 - 1
CD Input Layer(s) List	Integer	0 - 16
Model Type	String	0 - 1	RPC, ORBIT Default: RPC
File Description	String	0 - 1
Report	String	0 - 192	See parameter description

* Required parameter

Parameter descriptions

TIFF/NITF File Name

Specifies the full path and file name of the input TIFF or NITF file.

Output: Output file name

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

OutputOrbit: Output satellite orbital ephemeris layer

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

OutputRPC: Output satellite orbital ephemeris layer

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

CD Input Layer(s) List

Specifies the list of channels or layers 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 will be read from the file.

Model Type

Specifies the type of model segment to create. Either an orbit segment or a RPC segment will be created.

The following options are supported:

• RPC Create a RPC math model segment.
• ORBIT Create an orbit segment for use with the toutin math model.

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.

If TEX1 (File Description) is not specified, the File Header fields in the generated output PCIDSK image database hold the following information:

• FH5 receives the tape ID, satellite sensor, and satellite track
• FH7.1 receives the acquisition date and scene center (longitude and latitude, in decimal degrees)
• FH7.2 is empty

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

CDOV is part of the satellite orthorectification component. It reads an OrbView TIFF or NITF format CD when satellite orthorectification is required. The corresponding metadata file must also exist in the same directory. CDOV automatically creates a PCIDSK file, reads all the requested imagery channels from CD, and saves the satellite path or RPC information in a segment.

The PVL file and the input TIFF file must reside in the same directory.

CDOV extracts from the CD the geographic coordinates of the scene center and the four 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. To ensure an accurate calculation, a sufficient number of GCPs must be used for each scene or block of scenes.

The output file is automatically created with the dimensions required to hold all of the requested data. Ensure that sufficient disk space is available before running CDIKONOS.

References

Toutin, Th. "Analyse mathématique des possibilités cartographiques du système SPOT". Thèse de Docteur-Ingénieur en Sciences Géodésiques, ENSG, Paris, France, 1985. pp1 -163.

Toutin, Th. and Carbonneau Y. "La multi-stéréoscopie 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.)

Holekamp, K., "Radiometric Characterization of the IKONOS, QuickBird, and OrbView-3 Sensors", Civil Commerical Imagery Evaluation Workshop, Laurel, Maryland, USA, March 15, 2006. (http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070038235_2007037712.pdf).