Height variations in nearest measures


This algorithm calculates height differences between elevation pairs within a user-defined search radius. Suggested values are between 50 and 500-1 000 m, depending on the desired output resolution and on the slope and roughness of the topographic surfaces. The user can choose to output results only within a predefined range of the elevation differences, e.g., all pairs with height differences between 0.5 m and 5 m. More details are in Alberti & Biscaro (2010).


Language: Fortran 90/95
Compiler: g95 - Windows
Version: 2008-08-12
Code: height_var.zip

Since data in GLA12 files are in big-endian notation (the Unix default), compile the program in Windows using the big-endian data option.
For example, with the free g95 compiler, the command line should include the "-fendian=BIG" option, e.g.:
  prompt> g95 HeightVarGLA_v1.0.f95 -fendian=BIG -o heightvar.exe

Program input

The input for the elaborations consists of one or two binary files (with .dat extension) created by the ReadGLA12 program, storing data for a specific geographic domain acquired in a single time interval (when using one input file) or in two different time intervals (two input files).

Program output

Filtered-in pairs are written in an output text file that can be easily imported into GIS software. A metadata file stores information about the analysis session and analysed tracks (e.g., time, input files, used thresholds on distance and elevation differences, and summary results for each track).


My name is Mauro Alberti. I'm a Gis and scientific programmer. My primary specializations are in scientific and GIS programming (OS tools, mainly Python, R, Fortran and C++), Earth Sciences (structural geology, Polar Sciences), geostatistical analysis. About me


Mauro Alberti