topic Re: Point to Raster - how it works in ArcGIS Pro Questions

Point to Raster - how it works

AmyOKeefe — Mon, 04 Apr 2022 13:16:46 GMT

I've been using the Point to Raster tool to convert XYZ bathymetry data.

I have selected the Cell Assignment Type as Minimum, but have just noticed in the Environments section that the raster storage resampling technique is Nearest Neighbour.

I'm just wondering are 2 interpolation methods going on in the background then? I'm trying to determine how accurate the raster is.

Re: Point to Raster - how it works

SteveLynch — Mon, 04 Apr 2022 13:30:51 GMT

Please see the tool's help

Re: Point to Raster - how it works

AmyOKeefe — Mon, 04 Apr 2022 13:44:16 GMT

This doesn't really answer my question. Thank you though

Re: Point to Raster - how it works

SteveLynch — Mon, 04 Apr 2022 13:49:52 GMT

PointToRaster does not do any interpolation in the background.

Re: Point to Raster - how it works

AmyOKeefe — Mon, 04 Apr 2022 13:51:07 GMT

I'm not quite sure how it works then, would you mind clarifying please?

Re: Point to Raster - how it works

SteveLynch — Mon, 04 Apr 2022 13:57:29 GMT

if you've picked Minimum and say 3 points with values 5,6,7 fall within a raster cell, then that cell will be assigned a value of 5.

Have you looked at How Point To Raster works

Re: Point to Raster - how it works

AmyOKeefe — Mon, 04 Apr 2022 14:05:03 GMT

Yes but where does the nearest neighbour come in with the pyramids?

I'm confused by the gridding process which creates the raster

Re: Point to Raster - how it works

SteveLynch — Mon, 04 Apr 2022 14:13:08 GMT

https://pro.arcgis.com/en/pro-app/2.8/tool-reference/environment-settings/pyramid.htm

PointToRaster will not use interpolation.

Re: Point to Raster - how it works

AmyOKeefe — Mon, 04 Apr 2022 15:20:26 GMT

interpolation was the wrong word used by myself. I meant proximity search. Your answer still isn't answering my question about are 2 processes going on

Re: Point to Raster - how it works

SteveLynch — Mon, 04 Apr 2022 16:11:29 GMT

Have you looked at How Point To Raster works

Re: Point to Raster - how it works

Luke_Pinner — Wed, 06 Apr 2022 09:18:54 GMT

Nearest Neighbour resampling doesn't come into it at all. There's no proximity search, interpolation or resampling going on.

The only applicable environments are:

Auto Commit, Cell Size, Cell Size Projection Method, Compression, Current Workspace, Extent, Geographic Transformations, Output CONFIG Keyword, Output Coordinate System, Pyramid, Scratch Workspace, Snap Raster, Tile Size

As to how it works, that's explained in detail in the link @SteveLynch provided. You specify a cell size and extent and values are assigned to each cell according cell assignment type and the points that fall inside that cell. (with some rules to handle points right on cell boundaries)

Are you using ArcMap? I think, ArcMap shows you all environment settings, even those that don't apply. Pro only shows applicable environments. But the ArcMap help also states that only the above environments apply.