Mapping Toolbox

findm

Find latitude and longitude coordinates for nonzero map entries

Syntax

• [lat,lon] = findm(map,maplegend)
  [lat,lon,val] = findm(map,maplegend)
  [lat,lon,val] = findm(latin,lonin,map)
  mat = findm(...)  
  

Description

This function works in two modes: with a regular matrix restriction and without.

[lat,lon] = findm(map,maplegend) returns latitude and longitude vectors lat and lon, which provide the locations of all nonzero entries of the regular matrix map, map, with three-element map legend vector maplegend.

[lat,lon,val] = findm(map,maplegend) also returns the values, val, of the matrix map corresponding to the lat and lon locations.

[lat,lon,val] = findm(latin,lonin,map) removes the regular matrix restriction. Two matrices, latin and lonin, the same size as map, must provide cell-by-cell latitude and longitude coordinates matched with the corresponding entries of map.

mat = findm(...) returns a single output mat of the form [lat,lon].

Examples

The entered map can also be the result of a logical statement. Where is elevation greater than 5500 meters?

• load topo
  mat = findm((topo>5500),topolegend)
  mat =
     34.5000   79.5000
     34.5000   80.5000
     30.5000   84.5000
     28.5000   86.5000
  

These points are in the Himalayas.

See Also

find	Find indices and values of nonzero elements (see online MATLAB Function Reference)

filterm

flat2ecc