CDMERIS

Description

CDMERIS reads the MERIS format CD when satellite orthorectification is required. CDMERIS automatically creates a PCIDSK file, reads all the requested image channels from CD, and saves the satellite path information in a segment.

Parameters

Name	Type	Length	Value range
Input MERIS File Name *	String	1 -
Output: Output file name *	Raster port	1 -
OutputOrbit: Output satellite orbital ephemeris layer *	ORB port	1 - 1
CD Input Layer(s) List *	Integer	1 - 16
File Description	String	0 - 1
Report	String	0 - 192	See parameter description

* Required parameter

Parameter descriptions

Input MERIS File Name

Specifies the full path and file name of the MERIS-format file to be processed. The input file has an .N1 extension.

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 output satellite orbital ephemeris layer that will receive the orbital information.

CD Input Layer(s) List

Specifies the list of channels or layers to read from the CD. Up to 9 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.

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

CDMERIS is part of the satellite orthorectification component. It reads the MERIS format CD when satellite orthorectification is required. CDMERIS automatically creates a PCIDSK file, reads all the requested image channels from CD, and saves the satellite path information in a segment.

CDMERIS 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 CDMERIS.

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.)