topic Re: Feature to Raster in ArcGIS Pro Questions

Feature to Raster

RichardMorris — Sun, 05 Jun 2022 01:27:41 GMT

I am trying to convert a feature layer to a raster. The feature layer contains 3 classes, but only 2 of the classes are converting across to the raster. Please see attached (one image showing the resulting purple raster, the other showing the feature class (AE4) that is not converting.

Any pointers much appreciated. This follows a previous issue with merging feature layers, that came up with layer I'm now trying to convert to a raster @DanPatterson

Cheers, Richard

Re: Feature to Raster

DanPatterson — Sun, 05 Jun 2022 02:24:14 GMT

When you merged the orchards (the multipart features were merged last), you now have overlapping polygons,

Remove Overlap (multiple) (Analysis)—ArcGIS Pro | Documentation

should "burn" the orchards into the surrounding landscape, if not examine some of the overlay tools (like update) to get what you need prior to converting to raster.

An alternative would be to combine two rasters (orchards and the other)

Re: Feature to Raster

RichardMorris — Sun, 05 Jun 2022 05:12:27 GMT

Hi Dan - thanks, but when I try Remove Overlap the error message tells me that the Geometry cannot have Z-values. Previously, when merging these features, I had changed the Elevation properties for these features to 'On the ground. I assumed this had flattened them i.e. removed Z-values. Online instructions about removing Z-values talk about changing the GDB... would appreciate hearing if there are any quicker ways to deal with this.

Thanks, Richard

Re: Feature to Raster

SteveLynch — Sun, 05 Jun 2022 14:54:16 GMT

is class 33 obscured by class 40, i.e do you have overlapping polygons?, or

is the raster cell too large to show class 33?

...and have you looked at rather using PolygonToRaster?

Re: Feature to Raster

RichardMorris — Sun, 05 Jun 2022 18:19:11 GMT

Hi Steve

I tried these two suggested options, thanks. The PolygontoRaster options yields the same result (ie: AE4 not included). The raster cell size should be fine - the minimum width of the polygon is c. 7m. I tried the cell size at 1m to check, but still the same result.

Any other suggestions much appreciated.

Re: Feature to Raster

SteveLynch — Sun, 05 Jun 2022 19:56:32 GMT

but does the cell center of the raster cell fall within class 40?

Try using a priority field (PolygonToRaster) and specify positive values for class 40, see Maximum area method

Re: Feature to Raster

RichardMorris — Sun, 05 Jun 2022 21:54:39 GMT

Hi Steve

- the cell centre of the polygon I'm trying to include (AE4) I presume falls inside 40 - please see attached 'crosshairs' - is this what is meant by centre of the cell??

- would like to try Maximum Area but how do you specify positive values for a specific class?

Re: Feature to Raster

DanPatterson — Sun, 05 Jun 2022 22:41:02 GMT

The cells must fit within the squiggle orchards. what is the width of those? Your cell size should be at least 1/2 the average width if you have any chance of retaining those features (my rule of thumb).

Re: Feature to Raster

RichardMorris — Sun, 05 Jun 2022 23:33:56 GMT

Thanks

They squiggle orchards min width c. 7m; I tried 1m cell size but the result was the same.

Re: Feature to Raster

DanPatterson — Mon, 06 Jun 2022 01:52:44 GMT

You didn't try....

An alternative would be to combine two rasters (orchards and the other)

using the same cell size, extent and alignment, then combining them with the Con statement

Re: Feature to Raster

MorrisR2 — Mon, 06 Jun 2022 03:23:06 GMT

Hi Dan - sorry, I forget to try this option.

In the attached is the result. While the Combine has completed OK, the resulting raster (ae124a_pol8) is not what I was expecting:

only the ae4 raster is visible in the combined raster. This is possibly due to my lack of Symbology skills?
the attribute tables of the two combined rasters don't seem to have merged as expected. Previously LULC were listed as Values, now they are shown as Fields, and one of the classes (52) has dropped off.

Any further suggestions much appreciated.

Cheers

Richard

Re: Feature to Raster

DanPatterson — Mon, 06 Jun 2022 09:37:32 GMT

How to change NoData cells to a value—ArcGIS Pro | Documentation

raster calculator

syntax, means if the area surrounding the squiggles is nodata, assign the values from the other raster, else, use the orchards

Con(IsNull("orchards"), "other_raster", "orchards")