geoloc2grid

Convert geolocated data array to regular data grid

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Syntax

[Z,R] = geoloc2grid(lat,lon,A,cellsize)

Description

[Z,R] = geoloc2grid(lat,lon,A,cellsize) converts the geolocated data array A, given geolocation points in lat and lon, to produce a regular data grid, Z, and the corresponding raster reference object R. cellsize is a scalar that specifies the width and height of data cells in the regular data grid, using the same angular units as lat and lon. Data cells in Z falling outside the area covered by A are set to NaN.

Examples

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Open Live Script

Load a geolocated data array into the workspace. 

load("mapmtx.mat","lt1","lg1","map1")

Convert the geolocated data array to a regular data grid with 0.5-degree cells. 

cellsize = 0.5;
[Z,R] = geoloc2grid(lt1,lg1,map1,cellsize);

Display the geolocated data array and the regular data grid in a tiled chart layout. 

latlim = R.LatitudeLimits;
lonlim = R.LongitudeLimits;

figure
tiledlayout(1,2)

nexttile
ax1 = axesm("mercator",MapLatLimit=latlim,MapLonLimit=lonlim, ...
    Grid="on",MeridianLabel="on",ParallelLabel="on");
ax1.Visible = "off";
geoshow(lt1,lg1,map1,DisplayType="texturemap")
demcmap(map1)
title("Geolocated Data Array")

nexttile
ax2 = axesm("mercator",MapLatLimit=latlim,MapLonLimit=lonlim, ...
    Grid="on",MeridianLabel="on",ParallelLabel="on");
ax2.Visible = "off";
geoshow(Z,R,DisplayType="texturemap")
demcmap(Z)
title("Regular Data Grid")

Figure contains 2 axes objects. Hidden axes object 1 with title Geolocated Data Array contains 14 objects of type surface, line, text. Hidden axes object 2 with title Regular Data Grid contains 14 objects of type surface, line, text.

Tips

geoloc2grid provides an easy-to-use alternative to gridding geolocated data arrays with imbedm. There is no need to preallocate the output map; there are no data gaps in the output (even if cellsize is chosen to be very small), and the output map is smoother.

Version History

Introduced before R2006a

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See Also

Functions

Objects