MODEL2RPC

Description

MODEL2RPC generates a rational-polynomial-coefficient-model segment or text/xml file from an input math-model segment. A rational-polynomial coefficient is known as an RPC.

Parameters

Name	Type	Caption	Length	Value range
FILI *	String	Input-file name	1 - 192
FILO	String	Output-file name	0 - 192
MMSEG	Integer	Input-math-model segment	0 - 1
RPCZREF	String	RPC-elevation reference	0 - 6	Default: ELLIPS
REPORT	String	Report mode	0 - 192	Quick links

* Required parameter

Parameter descriptions

FILI

The name of the input file that contains the math-model segment to convert.

FILO

The name of the output file to receive the RPC segment. Currently, only a PCIDSK (.pix) file can properly support the creation of a math model.

If the output file is not specified, a new rational-function-model (RFMODEL) segment is created in the input file (FILI).

If the output file name has a .txt/.rpb extension, the RPC output is written to a text file. If the output file name has a .xml extension, the RPC output is written to an xml file. There are two different RPC text file formats with different extensions, i.e., _rpc.txt and .rpb. _rpc.txt format is mostly used by satellites such as IKONOS and GeoEye old formats and .rpb is mostly used by satellites such as QuickBird and WorldView. This program will output the RPC according to the file extension.

MMSEG

The input-math-model segment from which to generate the RPC model. If MMSEG is zero, it will generate RPC model from the geocoded image.

RPCZREF

The computed RPC-elevation reference.

Available options are:

• ELLIPS: elevations are referenced to the ellipsoid
• MSL: elevations are referenced to Mean Sea Level (MSL)

The default is ELLIPS (ellipsoid).

REPORT

Specifies where to direct the generated report.

Available options are:

• TERM: generates a report on the terminal (default)
• DISK: generates a report on file "IMPRPT.LST"
• OFF: turns off report generation
• <filename>: appends a report to the specified file

Details

MODEL2RPC converts a math model inside an image file to a rational-function-model segment.

If no value is specified for the output file (FILO), a new segment is created in the input file (FILI). If the the value specified for FILO is a file name with a .txt extension, MODEL2RPC writes the RPC information to that text file.

Example

Generate a rational-function model for a given PCISDK file.

                EASI> fili = "image.pix" ! input file containing math model
                EASI> filo = ! create new output segment in FILI
                EASI> mmseg = ! use last segment in FILI
                EASI> rpczref = "ELLIPS"  ! use ellipsoidal
                EASI> run model2rpc