RFMODEL

Description

RFMODEL calculates the mathematical models required for orthorectification using rational functions, and stores the result in a segment.

Parameters

Name	Type	Length	Value range
Input: Image layers to be processed *	Raster port	1 - 1
InputGCP: Input GCP segment or layer	GCP port	0 - 1
InputRF: Math model segment or layer	BIN port	0 - 1
OutputMM: Output math model layers	Raster port	0 - 1
RPC Adjustment Order	Integer	0 - 1	0 - 2
Number of Coefficients	Integer	0 - 1	3 - 20
Output Projection	String	0 -	PIXEL, UTM, METER, and others
Report	String	0 - 192	See parameter description

* Required parameter

Parameter descriptions

Input: Image layers to be processed

Specifies the input raw image layers to be processed.

InputGCP: Input GCP segment or layer

Specifies the ground control point (GCP) segment or layer to use to compute the model.

InputRF: Math model segment or layer

Specifies the math model segment or layer that stores the model.

OutputMM: Output math model layers

Specifies the math model layer to store the computed model.

RPC Adjustment Order

If RPC data is supplied with the data, this value specifies the RPC adjustment order to be used in the RPC model refinement. Valid values are 0, 1 or 2.

Number of Coefficients

If RPC data is not supplied with the data, this value specifies the number of coefficients to be used to calculate the rational function. Valid values are 3 to 20.

Output Projection

Specifies the projection string for the output model.

The standard definitions are as follows:

PIXEL: pixel and line
UTM: Universal Transverse Mercator
SPCS: State Plane Coordinate System
LONG/LAT: longitude and latitude
METER: image along-row and along-column meters
FOOT: image along-row and along-column feet

For a complete list of supported projections and Earth models, see Understanding map projections. The format of the map units string is described in Output units.

If this parameter is not specified, the map units of the GCP segment are used.

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

RFMODEL calculates the mathematical model required for orthorectification using rational functions. It computes an updated rational functions solution, based on provided GCPs or rational function coefficients, or both.

There are several use scenarios for RFMODEL:

Enter an unreferenced raw image, GCPs, and a number of coefficients: RFMODEL computes the RPCs based on ground control information alone, and generates to a math model segment.
Enter a linked PCIDSK file to a raw image with RPCs (NITF, TIFF, with TXT): RFMODEL creates a math model segment in the linked PCIDSK database.
Enter an imported raw image with RPCs and GCPs: RFMODEL computes the x- and y- offsets, and generates to a math model segment on the input database.
Enter a folder of images or a wildcard selection of images with RPCs and GCPs: RFMODEL computes the x- and y- offsets for each image and generates to a math model segment on the input databases or linked databases, as required.
Enter a text file specifying parameters for several images: RFMODEL computes the x- and y- offsets for each and generates to a math model segment on the input databases or linked databases, as required.

Note: If you have RPCs but no GCPs, RFMODEL need not run. ORTHO and other functions interpret the RPC model transparently from the original raw image files (NITF, TIFF with TXT).

Note: When run with EASI the function sets the parameter named IMSTAT to the values that are returned by the Python version.

Environments	PYTHON :: EASI :: MODELER
Batch Mode	Yes
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RFMODEL

Generate Rational Function Model

Description

Parameters

Parameter descriptions

Details