Transform

Command Call with 4 different transform methods possible

Performs different transformations of an input dataset

Input Data - DEM (Raster Dataset) - a grid representing a continuous surface

Four transformation methods have been implemented:

• SQR Transform sqr ( input + 0.5 ) to take care of zeros
• Logit Transform (ln ( input / 1 - input ) )
• Z-Transform ( input - mean input ) / standard deviation of input
• Z-Transform2 according to Wendroth et al. (2002): ( input - mean input - 2 x standard deviation of input ) / 4 x standard deviation of input

transformed raster dataset - a grid representing a continuous transformed surface

http://www.ai-relief.org//functions/dataprep/transform/elev.jpg%%

http://www.ai-relief.org//functions/dataprep/transform/command.jpg%%

http://www.ai-relief.org//functions/dataprep/transform/logit.jpg%%

http://www.ai-relief.org//functions/dataprep/transform/sqr.jpg%%

http://www.ai-relief.org//functions/dataprep/transform/ztransform.jpg%%

http://www.ai-relief.org//functions/dataprep/transform/ztransform2.jpg%%

(:div input:) INPUT

Input Data - Elevation transform/elev.jpg

(:divend:)

(:div commandwindow:) COMMAND

Command Call with 4 different transform methods applied transform/command.jpg (:divend:)

(:div results:) RESULTS

LOGIT transform of Input DEM transform/logit.jpg

Square Root transform of Input DEM transform/sqr.jpg

Z-Transform of Input DEM transform/ztransform.jpg

Z-Transform2 of Input DEM transform/ztransform2.jpg

(:divend:)