Point Selection & Verification
Point selection can be done with the mouse by roaming over the
map, watching the coordinates in the panel at the bottom of the
window, and double clicking at the desired location. The accuracy
with which you can select locations will depend upon:
- The scale of the DEM
- The size of the window on the screen
- Your manual dexterity
With a large DEM or a small window you may not be able to be
very preciseyou can only select those points that exactly
correspond to pixels on the screen. The screen pixel size shown on the Information
menu choice will show you the resolution with which you can graphically
select points--note this is a best case, and assumes you actually can pick the
pixel you want. You can increase your
precision by setting the Verify Coordinates setting on the Coordinates
tab of the
options menu. This offers the following choices:
- None: all coordinates selected with the mouse will be
accepted. This will provide the fastest operation, but potentially
lowest resolution.
- Reasonable: coordinates where you might want to be the
most precise (e.g. weapons fans or line of sight
placement) will be verified. You have two choices,
described below, for verification.
- All: any coordinate will be verified. This will probably
be overkill, but if you wanted two three dimensional
views to cover exactly the same ground you should select
this option.
You have two ways to verify coordinates (also set on the Coordinates tab of
options menu):
- Graphical blowup: you will get
a contoured blowup of the region around the point you
selected with the mouse. Select the
exact point you want by double clicking on the blowup
map.
- Keyboard selection: enter the exact coordinates you want, with the
mouse selection as the default. This does not let you
verify that the hill top coordinates read from your map
or GPS receiver are in fact those in the DEM.
Last revision 12/3/2011