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Raster

Raster is a program for the analysis of data from a low cost remote sensing platform known as airborne videography. The application of the technique in Eucalypt forests is described by Coops et al 1998. Raster was developed to apply these technique in a mixed Callitris/Eucalyptus woodland located at Burrendong in New South Wales. 

Raster is used to import the raw data files produced by the Specterra Systems Digital Multispectral Video System (DMSV). These binary files have a 512 byte header, followed by data structures representing light intensity in four bands (red, green, blue and near-infrared). Raster imports these files and converts the red, green and blue bands into a single bitmap (32 bit). The near-infrared (NIR) band is also saved as a bitmap. Facilities are available for converting files between four formats: Grid ASCII (Arc Info), BIL (binary inter-leaved), SUB (the raw format) and Windows bitmaps.

The interface allows you to filter out particular RGB values from an image, or transform the image using arbitrarily complex manipulations of the RGB values. The program also computes the habitat complexity score described by Coops et al 1998, and there are facilities for comparing the complexity scores with the original files. You can see a screenshot here, and download either a zipped file, or a self-installing exe (each is about 2.2Mb - including a test file). The program was developed for in-house use, and so I haven't had time to write a help file. If you have problems, please contact poptools@csiro.au.

I thank Nicholas Coops and Darius Culvenor for help in constructing the program. For further details, please consult the article by: Coops, N. C. & Catling, P. C. (1997) Utilising airborne multispectral videography to predict habitat complexity in eucalypt forests for wildlife management. Wildlife Research, 24, 691-702; or see the web page of Coops et al 1998.