CDIKONOS

Description

CDIKONOS reads IKONOS imagery from a CD for orthorectification. The corresponding metadata file must also exist in the same directory. CDIKONOS automatically creates a PCIDSK file, reads all the requested imagery channels from CD, and saves the satellite path information in a segment.

Parameters

Name	Type	Length	Value range
TIFF 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	0 - 16
File Description	String	0 -
Report	String	0 - 192	See parameter description

* Required parameter

Parameter descriptions

TIFF File Name

Specifies the path and file name of the input TIFF file.

Output: Output file name

Specifies the name of the PCIDSK file that will contain the output satellite CDIKONOS image layer(s). This file will be 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 satellite orbital ephemeris layer.

CD Input Layer(s) List

Optionally specifies the list of channels or layers to read from the CD. Up to four channels may be specified. If this parameter is not specified, the function reads all available channels: panchromatic images will have one available channel, multispectral images will typically have four.

For each channel, the function creates a corresponding channel in the output PCIDSK file. Duplicate channels are not allowed.

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

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

For color data in separate files, the channel numbers 1, 2, 3 and 4 correspond to the red, green, blue, and near-infrared data.

CDIKONOS 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.

The OutputOrbit parameter receives the number of the segment that contains the orbital information.

Acknowledgements

PCI Geomatics acknowledges the assistance of Dr. Thierry Toutin for this software.

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.)