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findm

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Latitudes and longitudes of nonzero data grid elements

Syntax

[lat,lon] = findm(Z,refvec)
[lat,lon,val] = findm(Z,refvec)
[lat,lon,val] = findm(Lats,Lons,Z)
mat = findm(...)

[lat,lon] = findm(Z,refvec) returns latitude and longitude vectors lat and lon, which provide the locations of all nonzero entries of the regular data grid Z, with three-element referencing vector refvec.

[lat,lon,val] = findm(Z,refvec) also returns the values val of the data grid corresponding to the lat and lon locations.

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

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

Description

This function works in two modes: with a regular data grid and with a geolocated data grid.

Example

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

load topo
[lat lon] = 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. Find the grid values at these locations with setpostn:

heights = topo(setpostn(topo, topolegend, lat, lon))

heights =
        5559
        5515
        5523
        5731

You must use a regular data grid in order to retrieve the elevations from setpostn.

See Also

find (MATLAB function), setpostn

  

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