Aim
The algorithm determines local minimum and maximum heights of cyclical features such as megadunes. It uses a moving filter along the track. This filter selects the elevations representing a local minimum/maximum or a flat within a four-elevation range.
Code
Language: C++
Compiler: CodeBlocks - Windows
Version: 2009-07-20
Code: minmax.zip
Program input
The input data format is:
track_id x y z
The program asks for a trend and an angular tolerance value used to analyze only the tracks
with orientations within trend plus/minus angular tolerance. These parameters allow to emphasize
structures sub-perpendicular to the chosen trend.
Program output
The output is an ASCII file with resulting local minima/maxima. Its format is:
track_id, x, y, z, minmax_type
The last field represents the type of found point, i.e., it represents a minimum or a maximum.
Example of program output from multiple parallel tracks of ICESat data. Red dots represent the crests and blue dots represent the troughs of the megadunes. Base image: MOA satellite mosaic.
