Using maxent output in Arcmap tabulate area tool

[Neil Daniels]

Hi all

I have the ASCII output (logistic) from Maxent which obviously contain probability cells all below 1

My study areas are 17000 square polygons at 5minute resolution( each cells approx. 86km2) 

I plan to use the tabulate areas in order to calculate the amount of Maxent probability grid cells that fall within each of my study areas. These are two approaches below I have used but both are not working:

1. After converting the maxent ASCII file to ESRI GRID float, I projected it into a projected co ordinate system. I then used the build raster attribute table tool since it did not have an attribute table, and I would assume you need one in order to perform the tabulate areas successfully. I was unable to build a raster table because arcmap said that only single band integer raster datasets can be used

2. So, I then converted the ASCII file into a ESRI GRID interger instead. Projected it into a projected co ordinate system, then used the build raster attribute table tool. The problem is the entire map consists of values of 0 and the attribute table consists of  1 row with all the counts summed into the single row

I'm not sure what else to try

If anyone could suggest anything, it would be highly appreciated

Kind regards

Neil Daniels

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[Jamie M. Kass]

You could make a binary raster with the Con tool, then convert it to polygon and run Intersect. Create a new field in the intersected polygon and Calculate Geometry to get the area of each shape. This will only work if it’s projected in meters correctly.

Jamie

[Neil Daniels]

Hey Jamie

Thanks for the suggestion. Will make a note of it

I actually managed to use the raster calculator and convert to integer with values between 0-100

Kind regards

Neil Daniels

On Thu, May 17, 2018 at 6:10 AM, Jamie M. Kass <ndimhy...@gmail.com> wrote:

You could make a binary raster with the Con tool, then convert it to polygon and run Intersect. Create a new field in the intersected polygon and Calculate Geometry to get the area of each shape. This will only work if it’s projected in meters correctly.

Jamie

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[Husam El Alqamy]

Hi Neil 

I would suggest a different approach. From the beginning vectorize your ESRI GRID raster into polygons. then you will have your attributes table and the polygon shape where you can do all the required calculations in a vector domain. Another approach is to use the raster calculator and multiply your raster by 10000 for example then it can be converted to an integer with the values being carried over nicely without being rounded to 0 for all values.

Regards

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[Neil Daniels]

Hi Husam

I actually managed to go the polygon route and so far its looking and working out nicely

Thanks for the suggestion

Kind regards

Neil Daniels