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Radius around an origin - Raster

YaserSadafi

Hi,

I have a raster map with 1sqr kilometre cells with categorise different land covers (Total 9 categories). My goal is to find a specific area demand of land type around an origin which is a city and then find the radius around the city that covers this demand. I'm not sure how can I do this in ArcMap.

For example I have to figure out what radius satisfies the Forest land demand around my city.

Thanks,

Yaser

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Accepted answers

curtvprice

There are many approaches to doing this. Here's an idea:

1. Run Euclidean DIstance with your city centroid (or perhaps polygon)

2. Run Slice to create integer distance ranges.

3. Do a selection on your land cover raster for forest land (raster layer selection , or use Set Null)

4. Run Zonal Geometry As Table to tabulate forest land by distance range.

5. Load the table into an excel spreadsheet (or equivalent) and doing a running sum of area.

6. At some point you'll hit your area cutoff. Interpolate the values between those on either side of your threshhold.

All comments

YaserSadafi

Hi Sephe,

No, the 99 is the example radius in km. That is an example of what my result is supposed to be. I mean a 27290 km^2 area of forestland around the city is the demand (is known, input of question) and I have to find the radius which satisfies the area. I have to do this for some other land-covers as well.

Cheers

SepheFox

In your example of forestland demand, is it 99 SQUARE kilometers you are looking for?

YaserSadafi

Hi Curtis,

Thanks for your reply. But the problem is I still don't know what is my distance. I mean I only know the demand area, each cell is a 1sqr kilometre, I have to select that number of cells around my specific origin according to area demand and then calculate the radius around the origin. Do you still recommend the same approach?

Regards,

curtvprice

There are many approaches to doing this. Here's an idea:

1. Run Euclidean DIstance with your city centroid (or perhaps polygon)

2. Run Slice to create integer distance ranges.

3. Do a selection on your land cover raster for forest land (raster layer selection , or use Set Null)

4. Run Zonal Geometry As Table to tabulate forest land by distance range.

5. Load the table into an excel spreadsheet (or equivalent) and doing a running sum of area.

6. At some point you'll hit your area cutoff. Interpolate the values between those on either side of your threshhold.

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