Map GPS Coordinates - GPS Map Coordinates ... - Global Mapper

Global Mapper User's Manual
depression will be filled before it is considered a basin and flow is allowed to terminate there. The depression
fill depth value will automatically be filled in with some guess at a good value based on the range of loaded
elevation values, but you might want to modify this, especially if you have relatively flat terrain with a lot of
depressions. Note that it can take a while to fill particularly deep depressions. When trying to determine a a
good value to use for the depression fill depth you should think about how high of an embankment or 'dam'
that you might encounter that you want to allow water to fill up to the top of and pour over, or also how deep
of a small pond or puddle to fill and allow spilling out of. You can also check the option to Save DEM to
Global Mapper Grid File After Filling Depressions to save the depression-filled terrain to a GMG file so you
can load that for future watershed operations to avoid having to fill depressions again.
The Operations at Selected Point Locations section allows you to perform additional flow and drainage
network delineation based on point locations selected in the Digitizer Tool. The Create Watershed Areas
Showing Drainage to Selected Point(s) option will calculate a drainage (watershed) area for each selected
point features showing which portion of the loaded terrain drains to the immediate vicinity (i.e. within one
sample of the point location) of the selected point. The Trace Flow from Selected Point(s) (Water Drop
Analysis) option will cause a separate arrowed line to be generated starting at each selected point feature
showing where a drop of water placed at that point location will flow to.
The screenshot below shows a watershed created from a collection of USGS DEMs. In it you can clearly see
the stream network as well as the drainage areas for each stream segment.
Map GPS Coordinates - GPS Map Coordinates - GPSCoordinates Map 84