Edit Menu

Menu  choice available with a DEM available for the active map window. 

  • Mask map
  • Mark as missing submenu
  • DEM Holes submenu
  • Reclassify: replace values with a new value
    • Single value: all occurences with the desired value will be reclassified to the selected new value; this should be done with integer and not floating point grids (use range for that)
    • Range to single value: values between a desired min and max will get the desired new value
    • All valid to single value: anything that is not missing data will be converted to the desired new value.
    • +Inf: converts anything coded as positive infinity will be converted to desired new value; missing data will not be affected.
    • NAN: converts anything coded as "not a number" will be converted to desired new value; missing data will not be affected.
    • +/0/- codes: select a tolerance around zero, and all values will be coded as -1 or 0 or 1.
    • From lookup table; only works with an integer grid with no more than 256 distinct values.  You must create a database with "OLD_CODE" and "NEW_CODE" fields, and that will be used as a look up table for reclasification.
    • Replace all possible values from second grid: every valid value in the second, already opened grid will replace the nearest grid posting in the grid being edited.
    • Replace only valid values from second grid:
  • Remove: set a threshold.  If a single point is this much, or more, higher or lower than all eight neighbors, it will be replaced with the average of those eight points.
    • Single point spires
    • Single point pits
  • Flatten tails
    • High end
    • Low end
    • Flatten Lake:
  • Outline regions submenu (below)
  • Single grid arithmetic  (or map algebra)
  • Set z units
  • Vertical datum shift: shift between WGS84 ellipsoid, and EGM2008 geoid
  • Edit point elevations
  • Edit DEM grid
  • Reload DEM: if you have unsaved edits you want to discard, you can reload the original DEM.
  • Edit gazetteer symbology
  • Edit fans
  • Quarter DEM
  • Re-register image
  • Merge all images
 
 
Outline regions options:
  • region of interest--outline a polygon, and the program will subset the DEM to include just the points within it.
  • holes
  • lakes
  • region to fill holes with reference DEM
  • region to replace values with reference DEM

Last revision 10/5/2021