Measure Distance
MICRODEM provides a number of ways to compute distance:
 Buttons on map toolbar

Measure distancestraight
line segments. Double click to select points.

Measure distancecurved
trajectories picked with the mouse and stream
mode digitizing. Move to the first point, depress the left mouse
button, and move to the end location and the move the mouse button up.
Other ways to measure distance.
Distance algorithms
 Vicenty formula: ellipsoidl earth, more accurate, and the only one
recommended
 Haversine formula assumes spherical earth, and has errors over very
small distances
 Cosine formula assumes spherical earth, and has errors over very long
distances (opposite side of the earth)
Last revision 5/8/2019