Difference Change Map Display Options

If you have an old change map created before version 2023.2.16, it did not correctly record change for the z units in the grid.  You can fix with with Edit,    Set z units.

For a grid recorded as a change grid, you can selected the change display:

• When creating the difference map
• When change the display parameter.

Three color classes:

• Green above the high cutoff
• No color
• Red below the low cutoff

Control the display with the three tabs: Single cutoff use plus and minus the value High and low cutoffs can be any desired values Percentiles: allows specifiction of the cutoffs by percentiles within the difference distribution Change percentiles show below.  If the Positive change is the 80th percentile, 20% of the points fall there. Change category map  will have byte values and a lookup table to create a legend.  It will also allow creating statisitcs with the points in the DEM in each category (Geomorphometry by categories).

An effective display uses one of the DEMs being compared and

• Select the Reflectance/Hillshade map with a grayscale coloring.
• Overlay, Mulitple map interactive comparisons, Variable opaque merge (two maps)

last modified 3/25/2023