Determine if a point is over land or water

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Mike D. 2021-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/1437824-determine-if-a-point-is-over-land-or-water

回答： John 2024-9-9

Given a point (latitude, longitude), is there a function or easy way to determine if the point is over land or over water?

I could download coastline data from NOAA and determine if a point falls inside a polygon, but I'd rather not develop an algorithm myself if it already exists.

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Mike D. 2021-8-24

I see that File Exchange has a function gebconetcdf that someone created, and then I discovered the code that I need:

gebconc = netcdf.open('gebco_2021_n60.0_s10.0_w-90.0_e-40.0.nc', 'NOWRITE');

XGRID = netcdf.getVar(gebconc,0);

YGRID = netcdf.getVar(gebconc,1);

BATHY = netcdf.getVar(gebconc,2);

netcdf.close(gebconc);

KSSV 2021-8-24

ncread is simple to use.

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KSSV 2021-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/1437824-determine-if-a-point-is-over-land-or-water#answer_771679

Download GEBCO bathymetry data.... https://www.gebco.net/data_and_products/gridded_bathymetry_data/

For a given lon, lat; use interp2 and get the elevation/ bathymetry value, if the value is negative it is depth and lies in the ocean or water and if the value is positive it lies in the land.

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KSSV 2021-8-24

Read about ncdisp. This function will give you variables from there you give the variable name.

Mike D. 2021-8-24

Yes, I can see that both ncdisp and ncinfo tell me all about the structure, what I wanted was the few lines of code that allow me to read the binary file into Matlab variables.

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