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## land_or_ocean.m

version 1.0.0.0 (42.4 KB) by
Determine if input points (lat/lon) are over land or ocean

Updated 27 Jan 2014

File takes as input vector of points (lat/lon) and coastal resolution and returns vector of indicators for whether these points are over land or ocean. Makes geographic plot too, if desired.

Primary code was given in a response to a question by Brett Shoelson in Feb 2011: http://www.mathworks.com/matlabcentral/answers/1065-determining-whether-a-point-on-earth-given-latitude-and-longitude-is-on-land-or-ocean
As far as I can tell, this code has not been put into a function file for public use.

### Cite As

Dan Chavas (2021). land_or_ocean.m (https://www.mathworks.com/matlabcentral/fileexchange/45268-land_or_ocean-m), MATLAB Central File Exchange. Retrieved .

LR

Great function!
I found some of locations that produce the following error message:

---------------------------------------
Error using delaunayTriangulation/pointLocation
The triangulation is empty.

Error in inpolyfast (line 20)
si = dt.pointLocation(x(:),y(:));

Error in vec2mtx>cellCentersInPolygon (line 157)
in = inpolyfast(glon, glat, lon, lat);

Error in vec2mtx (line 109)
Z(~cellCentersInPolygon(lat, lon, sizeZ, R1)) = 2;

Error in land_or_ocean (line 65)
[Z, R] = vec2mtx(coast.lat, coast.long, ...
---------------------------------------

Some instances are the (lat,lon) couples (-19,41), (-68,163), (47,-127), (74,-72).
It looks like these locations might be at the same (or very close to same) distance from two different shores.

##### MATLAB Release Compatibility
Created with R2013b
Compatible with any release
##### Platform Compatibility
Windows macOS Linux