Mapping Toolbox

Matrix Map Data Operations
Table 9-24 Manipulation

Function	Description
changem	Substitute codes throughout matrix map.
findm	Lat/lon values of non-zero map entries.
ltln2val	Map code value for latitude and longitude point.
maskm	Mask out specified matrix entries.
resizem	Resize matrix map.

Table 9-25 Regular Matrix Maps

Function	Description
country2mtx	Matrix map for a country in the worldlo database.
encodem	Fill in indexed maps with specified seeds.
getseeds	Get seed locations for indexing regular matrix map.
gradientm	Gradient, aspect and slope of regular or general matrix map.
imbedm	Encode vector data points into regular matrix map.
limitm	Latitude and longitude limits for regular matrix map.
los2	Visibility between two points on a Digital Elevation Map.
mapprofile	Matrix map values along a path
maptrims	Trim matrix map to a region
meshgrat	Construct map graticule for surface object display.
neworig	Transform matrix map to new coordinate system origin.
setltln	Matrix coordinates to Greenwich frame.
setpostn	Greenwich coordinates to matrix map coordinates.
sizem	Row and column dimensions for regular matrix map.
vec2mtx	Regular matrix map from vector data.
viewshed	Area visible from a point on a Digital Elevation map.

Table 9-26 Special Regular Matrix Maps

Function	Description
nanm	Full matrix map of NaNs.
spzerom	Sparse regular matrix map of zeros.
onem	Full matrix map of ones.
zerom	Full matrix map of zeros.

Data Operations

Reference Data