topic Re: Conversion from Point to Raster in Geoprocessing Questions

Conversion from Point to Raster

stefaniadi_tommaso — Tue, 03 Sep 2013 22:58:19 GMT

Hello,
I am new to ArcMap and I would really appreciate some help. I want to create a new raster using a value in a column of a point shapefile.
I had a 8bands raster image and used the 'raster to point' tool to extract all points from the raster, in this way I obtained a point shapefile with a number of points equal to the number of pixels in the raster and with the points placed in the center of each pixel.
I extracted the values from the 8band raster and run (with other software) some analysis on each point (= each pixel) and joined it to the point table in a new column.
Now I want to create a raster with the same resolution of the original 8band raster but using as value the new column in the table. How can I do that?

I tried running 'Point to raster' but it's not doing what I am looking for.
Thank you for your help!

Re: Conversion from Point to Raster

DanPatterson_Retired — Wed, 04 Sep 2013 00:11:07 GMT

did you set the cell size and raster extent to ensure that the points fall within middle of each cell (assuming your points are equally spaced)

Re: Conversion from Point to Raster

stefaniadi_tommaso — Wed, 04 Sep 2013 01:02:21 GMT

did you set the cell size and raster extent to ensure that the points fall within middle of each cell (assuming your points are equally spaced)

Thank you for your answer!
The points fall at the center of each cell of the original raster(2x2m resolution) and are equally spaced at 2m.
In attachment what happens if I set the cell size to 2m in the 'point to raster' tool.
how can I create the new raster with the points in the middle?

Re: Conversion from Point to Raster

DanPatterson_Retired — Wed, 04 Sep 2013 15:55:38 GMT

cell size is one thing, raster extent is another, did you set the extent of the latter to match the former? it is done with the Environments tab of every tool in ArcToolbox

Re: Conversion from Point to Raster

stefaniadi_tommaso — Wed, 04 Sep 2013 17:26:54 GMT

cell size is one thing, raster extent is another, did you set the extent of the latter to match the former? it is done with the Environments tab of every tool in ArcToolbox

Thanks Dan! I set the correct extent using the Environments tab.

Re: Conversion from Point to Raster

DanPatterson_Retired — Thu, 05 Sep 2013 05:10:00 GMT

Stephania...close the thread by selecting the correct answer so that people know that the problem was resolved...also it would be nice to show the resultant image so that people know what worked... ciao