Analyze Menu

Until a DEM is loaded, only a few choices will be available on  this sub menu of the MICRODEM menu.

• Convert coordinates: convert between different datums, with lat/long, UTM, and MGRS coordinates.
• Computations
• Geocode, address to lat/long
• Sunrise-sunset tables or graphs, with algorithm from Naval Observatory.
• Moonrise/moonset: calculate moonrise and moonset (plus sunrise/sunset)
• Elevation histograms: provide a series of graphs.
• Elevation-slope plot: calculates statistics and displays a number of different graphs.
• Algorithms:
  • Vertical earth curvature
  • Horizontal earth curvature (requires open DEM)
  • Slope with lat/long DEMs--show maximum slope difference from assuming a constant spacing in meters over the entire DEM
  • Slope region size
  • ArcGIS geographic DEM conversion factors: this is the factor needed to get GCS DEMs to work correctly.  You can use only one factor, and must pick if you want the X direction, the Y direction, or the average.
• DEM Properties
• Header view header record for the DEM or image. You can verify that the datum is set correctly.
• File Metadata. Opens popup menu, select data type, pick file, and see metadata.
• Create
  • New global grid, Greenwich
  • New global grid, IDL
  • Landsat browse index
  • Landsat full scene index

• Geomorphometry analysis  (requires geomorphometry menu option set)
• Cluster grids (unsupervised classification): done with all open DEMs
• Trim deviations: remove points from the original DEM that are outside a specified deviation from the trend surface
• Correlation Matrix
• Distance matrix 
• Satellite predictions

These options may not be available, and may not work even if they are available.  They were developed for specific research projects, and some of the project flow may have been hard wired in the code.

• Batch processing--some of these can use multiple processors/cores, and operate on global data sets
  • Remove SRTM water bodies.  Select an input series from the map library, and and output directory.  All DEMs in the input series will have the SRTM water bodies removed, and the new DEMs will be saved in the output directory.  This should be SRTM, or SRTM-like data sets, in 1º (or multiple of  1º) tiles.
  • Geomorph atlas
    • Block statistics for series from the map library.  Landform wavelength/height can be done as part of this computation.  Uses threads for multiple processors.  Pick the DEM series to use, and the output directory for the DBF files.  Because of the threading, each DEM will have its results put into a separate DBF file which can be combined in another step.
    • Merge block statistics DBFs.  For SRTM-3", this will combine the dBase tables created by the block statistics options into global grids. 
  • Drainage basin statistics
  • Series differences

Last revision  4/3/2016