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colormap of temperature for a country only having about 79 locations (coordinates) and temperature at that site.

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hello,
i have a 3 column matrix, lat,long, temperature. I need to display this over the area of the country from which these temperature readings were taken. I know i need to interpolate somehow so that the whole region is covered with a colormap. I really need help. I am able to load the outline of the country using
worldmap({'Haiti','Dominican Republic'})
load coast
plotm(lat, long)
this gives me the desired country outline. I really need help, i have been googling for about 5 hours and i cant find anyone with this specific example, most people have the data for the whole country at every lat and lon.
thank you
any help is helpful.

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