GeoMapApp© Help
What does the Profile Tool Do?
The Profile tool makes a graph of the value of the currently-loaded grid along a user-defined line. For example, clicking on the Profile button will load the Topography (DEM) grid and then wait for the user to draw a line between two points on the map.
Once the user draws the line, a graph will be displayed showing the elevation at each point along the line, from a distance of 0 (the first point selected) to a distance denoting the end of the line (the second point selected).
Choosing a different grid than the Topography grid and then using the Profile tool will graph the values contained in that grid for each point along the user-defined line. Other grids to choose from include the Gravity grid and the Geoid grid.
How to Make a Profile
Step 1 - Click the Profile button 
or select Tools -> Make Relief Profile. The Topography (DEM) grid will be loaded by default, however, to load another grid for use with the profile tool, select the desired grid from the View -> Grids... menu or open the Grid Options window by clicking on the Grid button 
and select a grid from the drop down menu. Deselecting the Profile button will dispose any grid that is currently loaded if no other part of GeoMapApp that uses the grid is open (i.e. the grid dialog window or the Digitizer tool).
Step 2 - Press the mouse button (left or right) and drag the cursor from your start point to your end point and then release the mouse button. In the banner above the Main Map window, location, elevation, zoom factor and distance are displayed. Location of the cursor in latitude and longitude is shown in both degrees and minutes as well as decimal degrees. Elevation is given in meters; depth below sealevel is shown as a negative value. Distance is from the starting point of your line to the end point, in kilometers.
Step 3 - Once you release the mouse button the Profile window will appear: Note that as you move your cursor along the graph, the corresponding location on the map is shown by a circle.
Additional Options
Save menu - This menu gives users the option to copy the graph to the clipboard, save the graph as a .jpg or .png image, save the graph as an ASCII (text) table, or print the graph.
Great Circle, Straight Line - Great Circle chooses the shortest actual (spherical) distance between the two points, Straight Line simply selects the straight line (shortest planar distance) between the two points on the given projection. This not the shortest actual distance because Earth is (basically) a sphere.
X-Scale, Y-Scale - The X-Scale and Y-Scale of the graph each have an Auto-fit check box associated with them. These are selected by default to fit the graph within the viewing window. Unchecking Auto-fit for either the x-axis or the y-axis will allow the user to manually set the scale for that axis by entering the desired value in the text box to the right.