Title: Statistical Characterization of Altitude Matrices by Computer. Report 5. Terrain Analysis: Program Documentation
Abstract: Abstract : The terrain analysis system of programs derives, from a matrix of altitude data, the descriptive characteristics of gradient, aspect, and profile and plan convexity for the central point of each 3 x 3 square set of adjacent grid points. The characteristics are derived algebraically from a quadratic fitted by the least squares method to each set of 9 points. For the whole matrix, the mean, standard deviation, skewness and kurtosis are found for the calculated altitude, gradient and profile and plan convexities. The vector mean of the aspect is found and also the regression of each of the other characteristics with the sine and cosine of the aspect. The descriptive characteristics are displayed in several ways, viz, histograms, scatter diagrams and line printer density maps. A map is produced on the graph plotter giving the direction and magnitude of the gradient at each grid point. The programs are written in FORTRAN; they call SPSS and MIDAS routines and run under the MTS system on the NUMAC IBM 370/168 computer.
Publication Year: 1978
Publication Date: 1978-01-01
Language: en
Type: report
Indexed In: ['crossref']
Access and Citation
Cited By Count: 24
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