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<< Click to Display Table of Contents >> Basic Module - Intensity Processing - Geocoding - Image Conversion - Image Conversion to Orthographic Projection |
  
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<< Click to Display Table of Contents >> Basic Module - Intensity Processing - Geocoding - Image Conversion - Image Conversion to Orthographic Projection |
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Purpose
The aim of this tool is to convert Georeferenced or GEC products (both elipsoidal or on a reference height) in Geocoded coordinates using a precise Digital Elevation Model.
Technical Note
This tool is capable of converting Georeferenced and GEC products directly to geocoded coordinates, avoiding multiple conversion steps such as: from Georef/GEC to slant range, and from slant range to geocoded geometry, reducing the distortion caused by multiple resampling and interpolations.
In case the input products are in slant range or ground range geometry, the user must use the Geocoding and Radiometric Claibration tool. Geocoded files are not accepted as input file..
Input Files
Input file
Input File name that need to be converted to orthographic projection. The following data formats are accepted: Georeference and GEC. This file is mandatory.
DEM/Cartographic System
Digital Elevation Model file
Digital Elevation Model file name. This should be referred to the ellipsoid. In case a list of input files is entered, the DEM must cover the whole imaged area. This file is optional.
Output Projection
In case that the Digital Elevation Model is not used, it is mandatory to define the Cartographic System.
To use the same coordinate system as another dataset, click the Import from Existing Dataset button and select the source dataset.
To apply the same Coordinate System of the current selected layer
The reset icon allows to reset the coordinate system field.
Reference Height
In case that the Digital Elevation Model is not used, a constant ellipsoidal height must be provided. Default Reference Height is 0.
Parameters - Principal Parameters
Input File Reference Height
This reference height consists of the height used to generate the input file. In case the input file consist of a geocoded product, and the Conversion DEM is uploaded, this parameter is not considered.
This parameter is applied only in case the sml file of the Input file does not contain information regarding the Reference Height.
X Grid Size
The Easting (X) grid size of the output data must be defined; the default unit of measure is meters.
Note that - for the Geographic projection - if values higher than 0.2 are entered they will be considered as metric units and then automatically, and roughly, converted from meters to degrees; if values lower than 0.2 are entered they will be considered as degree and used as such without any conversion.
Y Grid Size
The Northing (Y) grid size of the output data must be defined; the default unit of measure is meters.
Note that - for the Geographic projection - if values higher than 0.2 are entered they will be considered as metric units and then automatically, and roughly, converted from meters to degrees; if values lower than 0.2 are entered they will be considered as degree and used as such without any conversion.
Radiometric Calibration
By setting true this parameter radiometric calibration is performed.
Parameters - Global
It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.
Parameters - Other Parameters
It brings to the general section of the Preferences parameters. Any modified value will be used and stored for further processing sessions.
Output Files
Output file
Name of the output orthographic, precisely located by using the input reference DEM, projected data. This file is mandatory.
_rsp
Data in geocoded geometry and associated header files (.hdr, .sml).
Details specific to the Units of Measure and Nomenclature of the output products can be found in the Data Format section.
General Functions
Exec
The processing step is executed.
Store Batch
The processing step is stored in the batch list. The Batch Browser button allows to load the batch processing list.
Close
The window will be closed.
Help
Specific help document section.
Specific Function(s)
None.
Task, SARscapeBatch object, SARscapeBatch script example
References Frei U., C. Graf, and E. Meier: "Cartographic Reference Systems, SAR Geocoding". Data and System, Wichmann Verlag, 1993. Meier E., Frei U., and D. Nuesch: "Precise Terrain Corrected Geocoded Images, SAR Geocoding". Data and System, Wichmann Verlag, 1993.