[GRASS-user] fill in null areas equal to nearest value

Hello GRASS community,
I have two maps - where one map is slightly larger than the other - so that the smaller map is missing data just around the edges based on the outline of the larger map.
The smaller map is a map of floating point values, the larger map has a single value of 1.
I would like to fill in the missing edge data of the smaller map based on the outline of the larger map - setting the null areas to the nearest value in the smaller map.

Thank you for any advice!

Janet

If I understand correctly, 1) set the computational region to match the larger map, 2) use r.grow.distance with input=smaller map and option ‘value’, 3) use r.mapcalc to trim the values based on the larger map.

Best,
Anna

On Mon, Feb 13, 2023 at 11:06 AM Janet Choate <jsc.eco@gmail.com> wrote:

Hello GRASS community,
I have two maps - where one map is slightly larger than the other - so that the smaller map is missing data just around the edges based on the outline of the larger map.
The smaller map is a map of floating point values, the larger map has a single value of 1.
I would like to fill in the missing edge data of the smaller map based on the outline of the larger map - setting the null areas to the nearest value in the smaller map.

Thank you for any advice!

Janet


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