topic Polgon to raster issue in Science Questions

Polgon to raster issue

BruceMiller1 — Mon, 25 Nov 2019 17:39:48 GMT

Seems unlike the older Email ESRI list no one responds to Geonet questions.

I need to update ASCII files with new data for spatial distributions mapping of critters.

I have created the new polygons, in this example distance from caves as a buffered set of polys. Using 100 m intervals from 0 to 5K m. The new shp file looks fine with the concentric buffers at 100 m intervals.

I can not seem to follow up to create teh ASCII layers that match existing ASCII cell size, col & rows.

When I try the varied tools to create teh raster first from the shp file it only creates a single value of 5k distance and not the 100-meter increments needed.

I have tried virtually every tool I have in ArcMap 10.4 or ArcPro to no avail. There used to be a way to do this using an existing "Mask" or bounding poly for the area of interest and all would be the same number of rows and columns with the same coordinate reference.

Any guidance on why I am missing the goal welcomed.

Re: Polgon to raster issue

SteveLynch — Mon, 25 Nov 2019 18:08:08 GMT

Bruce

You have a polygon feature class that you want to convert to a raster, correct?

- what coordinate system are you using, projected in meters I guess?

- what is the default cell size that appears in the PolygonToRaster tool?

- what cell size should the output raster have?

-Steve

Re: Polgon to raster issue

BruceMiller1 — Mon, 25 Nov 2019 19:54:14 GMT

Hi Steve,

Whoohoo Tnx for taking to to reply.

This is all in ArcMap 10.4 as I am still navigating and trying to find

previously obvious tools which now like MS are "hidden"under layers of

stuff

DF and layers are UTM zone 16N using NAD1983.

Yes all layers are in meters.

Default cell = 410

Existing old ASCII file parameters that I need to match are:

ncols 213

nrows 306

xllcorner 254158

yllcorner 1748000

cellsize 1000

NODATA_value -9999

Thanks again for offing to assist.

Seems eons ago with ArcMap 9.X-10.1 this was not an issue

Bruce

Re: Polgon to raster issue

SteveLynch — Mon, 25 Nov 2019 20:15:54 GMT

and if you set the cell size=1000 in the PolygonToRaster tool, what is wrong with the output?

Re: Polgon to raster issue

BruceMiller1 — Mon, 25 Nov 2019 21:01:41 GMT

It creates a raster with only a single value 5000!

Which is the max of all of the buffered polys that range from 100-5000

meters.

I am assuming cell size = meters so 1000 would be 1K meters? Rethinking

this ... it may be an issue as I need to evaluate distance from caves

at a finer scale. I will need to do the same thing with distance from

water bodies/rivers.

Perhaps best to change the cell size to 500 and then only buffer eh

distances from each feature by 500 m intervals.

I would also need to extract the 12 climate variables with a new cell

size so all match to run the subsequent modeling.

Seems when I tried that no mater what "Mask" I used the varied layers

did not have the same row/column values.