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Environment Settings Raster Analysis Cell Size

NikolaiKirch

I need some kind of "official statement" for this case:

I have a raster with a cell size of 1x1 and one with the cell size of 10x10 and need them to be aligend with each other.

This worked for me so far, but i need to understand what has happend to align them:

I used the Extract by Mask Tool (ArcGIS 10.4.1.5686 License type Basic) like this:

Input: 1x1 raster

feature mask data: 10x10 raster

Environment Settings -> Raster Analysis -> Cell Size: Maximum of Inputs

my result is a raster with the values of the 1x1 raster but with the extent and cell size of my 10x10 raster (so they are aligend?).

The help says about the Cell Size that if you specify a finer cell size the tool will interpolate with the nearest neighbor technique, but in my case I had a coarser cell size and the cells were not aligend before.

With witch technique were the cells of my new raster populated?

Thanks in advance!

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NikolaiKirch

so i just tried this and i got the same result like i did with the extract by mask tool, but again i need to know how these tools/thier environment settings choose to align the pixels or the position of thier values.

i think that while processing something happend to the position of the pixels in order to align with the snap raster?

If thats not right and nothing had to be interpolated or resampled could you please explain it to me?

DanPatterson_Retired

I would run a test case, I think you will find that the aggregation with median and the appropriate extent_handling and snap raster will take care of your needs.. But you will have to compare with the other options and examine the borders of your cell aggregation compared to the inputs behave.

NikolaiKirch

the problem is that I can run into cases where aggregate cant solve my problems:

like having a raster of the cellsize 4.3x4.3 or 10.43x10.43 with not the same extent like my 10x10 raster from the beginning with which i need all of my future rasters to be align.

I need to create a workflow to align a raster with my 10x10 raster for every cellsize and extent.

DanPatterson_Retired

use aggregate before you do anything. I am not sure why you are wanting to skip that step if your output cell size is to be 10x10. Your shortcut is confusing, given that you have full control over the process and the output by Aggregating first. Can you elaborate?

NikolaiKirch

For me it already seems to be align after the Extract by Mask, the resulting raster has the same cell size, extent, rows and columns. Or am i wrong? and Extract by Mask does not fullfil this purpose?

Does Extract by Mask use nearest neighbor? Some kind of algorithm is used to populate my new raster with the values of the 1x1 raster.

DanPatterson_Retired

You can Aggregate the raster your finer raster to a coarser raster... it honors the Snap Raster in the environment settings, and there is no interpolation involved.

JayantaPoddar

In case you want to align the input Raster with the Feature Mask Raster, you could use Copy Raster for the input raster with Snap Raster Environment. Then you could use the Extract by Mask tool.

NikolaiKirch

this sounds like they arent? they seem to be align after the extract by mask, arent they?

JayantaPoddar

You could use Snap Raster (Environment Settings) to align the cells properly.

Environment > Processing Extent > Snap Raster.

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