Transform Operation

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The Transform operation outputs a virtual raster for each selected input raster or raster source that transforms the values of a single selected band. 

In single input mode, you are required to browse to the input raster, or select a raster source. You must specify the output virtual raster. In batch mode you can process multiple input rasters and you must specify the folder into which all output virtual rasters will be written. The field and band structure of all the input rasters ought to be the same. 

Select the field and band that will be processed. If the raster contains multiple events, all events in the raster will be processed. 

Finally, specify a data transform. You must create the data transform using the Data Transform Editor. Once you have done so, it will be available for selection. The data transform will be applied to the input band data values to generate the output data values. In single input mode, when you hit OK the new MVR file will immediately be opened and displayed in ProRaster. 

Most data transforms that you can create in the Data Transform Editor emit transformed values between 0 and 1. This value (referred to as an index) is then scaled to acquire a value from a color look-up table. In this case, you are likely to want to transform the data values from some range and distribution to another range and distribution. If so, you ought to use one of the following four data transform types that allow you to modify the index value, which you can set to the output data values. For more information on the data transforms, see the documentation for the Data Transform Editor. 

Table: Index over range: Specify the input data range of the transform by setting bandpass limits. The input data range is equally divided over the rows of the table. The minimum input data value for each row will map to the output data (index) value you specify. 

Table: Index for value: Specify the input data value for each row, and the output data value it maps to. This is the most likely transform you will employ. 

Table: Index for percentage: Specify the input data range of the transform by setting bandpass limits. Specify the input data value for each row in the table as a percentage (0 – 1) of the input data range. This will map to the output data value (index) in that row. 

Table: Index for percentile: As above, except that the input data values are a percentile (0 – 1) of the data distribution. Percentiles are transformed to data values via a distribution histogram.