ASC to ASC: Difference between revisions
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*A second grid with a “_wd” suffix is output to indicate which .asc grid cells were either previously wet and are now dry or vica versa. Importing this grid into Vertical Mapper creates a .grc (grid classification) grid that has two categories: “Was Wet Now Dry” and “Was Dry Now Wet”. This grid is particularly useful for displaying areas that were previously inundated or previously flood-free.
<li><tt>asc_to_asc.exe -out difference.asc -dif after_h.asc before_h.asc</tt><br>
Creates new grids comparing the differences in flood levels and extents for: "difference.asc" = "after_h.asc" - "before_h.asc"</li
Secondary options:
*"-nowetdry" does not carry out a wet/dry test. If both cells are active a difference is calculated.
*"-change" calculates change even if one cell is null (wet / dry areas). Assumes a "dry" cell has a value of zero. Can be used to calculate depth change.
*"-src" for -min,-max or various stat options to supress the source grid output. Will only output the minimum, maximum, mean, median, frac grid. The src_legend.csv is also supressed.
==Cutoff Depth==
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