User`s guide

R2007a
17-2
Performance Improvements for los2 and viewshed
This release includes a faster los2 function (which computes intervisibility between
locations on or above a terrain grid). The viewshed function (which computes the portions
of a terrain grid that can be seen from a given viewpoint) has also been accelerated as a
result.
Utility Functions for Computing Distance and Position Along Meridians
Two functions that reckon position and distance along a meridian on the ellipsoid are
now available:
• meridianarc — Computes distance along a meridian between two latitudes
• meridianfwd — Reckons position along meridian given a starting point and distance
Some GUIs Are No Longer Available from the Command Line
In prior releases, when you typed certain Mapping Toolbox function names with
no argument list, a specialized GUI appeared that enabled you to interactively set
parameters related to the function. This feature was seldom used and sometimes raised
errors when users attempted to operate the GUIs. Starting in this release, a GUI will no
longer appear when you issue the following commands:
• comet3m
• cometm
• contourfm
• contour3m
• contourm
• demcmap
• fill3m
• fillm
• lightm
• limitm
• linem
• meshlsrm
• meshm