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Is it possible to divide a raster into equal parts based off the sum of its cells?

Anonymous User

I'm working on a project to redraw district boundaries for our police department to help spread the work load more evenly among officers.

I created a raster layer showing overall time spent on calls across the city and was wondering if there is a way to divide the layer into equal value amounts rather than equal areas.

We have 4 districts and I'd like to divide my raster so that the amount of time (sum of the cells) is equally split. The boundaries have been arbitrarily drawn throughout the years as new areas where annexed so completely redrawing the district lines is not a problem.

Any ideas on how to approach this or am I hoping for too much?

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DanPatterson_Retired

Totally untried... but what about Cost Allocation which would be different than

Euclidean Allocation .... suggesting that a cost surface might apportion the space differently than purely distance based.

XanderBakker

Interesting thought to use Cost Distance for this purpose. Will probably not result in areas with an equal sum of the value, but might come close and requires the user to define the starting points.

I have done something (remotely) related to this (vector based) where the objective was to select as many parcels as possible based on a minimum distance between them. A similar approach could be used. Would be interesting to take a look. Brandon Jumonville , would you be able to share (a part of) the time raster or other input data to have a look at what is possible?

Anonymous User

Raster layer displaying total value for CAD call times

Anonymous User

So this is where I'm at right now. I took the total calls for a 5.75 year period, determined the average time officers spent per incident type, applied that value to the calls and created a 250'X250' raster from the points (1.25 million if you were wondering). So now I have these time values ranging from .36 to 4076.57 hours per cell but they aren't evenly divided between the current district boundaries... that's where I'd like to redraw the boundaries to evenly spread, at least reasonably close, the time spent between four districts.

XanderBakker

The image provide some more information on what you have, but is it possible to share some of the actual data?

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