ltln2val (Mapping Toolbox)

Determine matrix map entries or interpolated values associated with latitude-longitude points

Syntax

value = ltln2val(map,maplegend,lat,lon)
value = ltln2val(map,maplegend,lat,lon,method)

Description

value = ltln2val(map,maplegend,lat,lon) returns the values of the regular matrix map, map, corresponding to the locations specified by the vectors lat and lon.

value = ltln2val(map,maplegend,lat,lon,method) specifies the method for determining the returned value. The entry values of a matrix map are actually vertex values. The default method is 'nearest', which returns the unaltered value of the cell containing the coordinates lat and lon. Using a method of 'linear' or 'cubic' results in values that are linearly and cubically interpolated between vertices, respectively.

Examples

Find the elevations in topo associated with three European cities - Milan, Bern, and Prague (topo elevations are in meters):

load topo

The city locations, [Milan Bern Prague]:

lats = [45.45; 46.95; 50.1];    
longs = [9.2; 7.4; 14.45];

elevations = ltln2val(topo,topolegend,lats,longs)
elevations =
    94
   902
   545