UTILITY IIS2DTI

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UTILITY IIS2DTI

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FUNCTION

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FORMAT


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PROMPTS


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PARAMETERS

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COMMAND QUALIFIERS

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DESCRIPTION

IIS2DTI is a utility to convert raster data in International Imaging System's (IIS) system 500 format to a Laser-Scan Digital Terrain Image (DTI) file. System 500 data files are composed of swaths, each 512 bytes in width. These swaths run from the top of the image to the bottom. The data order within the file is the top row of the first swath followed consecutively by the rest of the swath. This is then repeated for each swath in turn until the whole width of the image is covered. It should be remembered that the number of actual values per swath width will depend upon the data type in the file, (i.e. 512 BYTE values, 256 INTEGER*2 values and 128 INTEGER*4 values). The data is stored in 512 byte fixed length records on disc.

The program also converts data in an extension of the normal 500 format where the data is arranged in scan lines across the input file in fixed length disc records, with the number of bytes per record being equal to the number of columns in the input dataset (ie. one single swath down the dataset). This extension is only usable for byte data (the default datatype), and is obtained by using the /WIDTH = record_length qualifier.

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RESTRICTIONS

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EXAMPLES

 $ IIS2DTI COVERMAP COVERMAP 420 401 /SHORT 

In this example the input IIS file is 420 rows by 401 columns. Each data value is a short integer. The DTI file created as output will also be 420 rows by 401 columns of short integers. The informational messages provide continual reassurance of the extent of the conversion. It can be seen that the DTI file is written out one IIS swath at a time. As the data in this example is INTEGER*2 the swath width is 256 values wide (512 bytes) and so two swaths are needed to cover the data area.

See iis2dtimsg.html generated from IIS2DTIMSG.RNO.