Mosaic to New Raster

[SarahNiemczura]

Morning Everyone,

I'm currently working on creating datasets with a uniform extent. This means some of the datasets I have need to be clipped down, and some need to grow and incorporate no-data fill values.

How does one go about this? I cannot seem to get a raster with an extent of -19,38,52,-36 to change to a raster with an extent 90,-180,180,-60.

Any thoughts on how to go about doing this?

[DanPatterson_Retired]

Only if the file is saved to a new one

[SarahNiemczura]

I have tried that, copy raster and raster to new mosaic using the environmental settings extent to the 90,-180,180,-60 and it doesn't create the no data values to fill the extent. Yes I do save them to a new file.

[DanPatterson_Retired]

did you determine the actual extents of the files?  Did you try some of the other suggestions?

[DanPatterson_Retired]

Sol...the environment settings should be set in the Environments tab for each tool used in Arctoolbox...there are many cases where the general raster settings were not honored by the tools

[MikeBallard]

Have you tried running ypur rasters through the raster calculator? You can set the desired output extent, and coordinate system. Ypu might also try the raster snap option too, which I believe will ensure each raster starts at the same coordinate position. You can have one input and one output raster. Failing that I would create a new "allones" raster of the desired dimensions and values all = 1, and in raster calculator try input raster * allones = desiredoutput.

[SarahNiemczura]

How would one put the coordinate system and extent into raster calculator? I'm not familiar with that.

I did however come up with a work around in case I can't find any programming; I've made a model that will copy out the raster in the proper extent, copy will then be * 0 to make it blank, I will then mosaic the smaller rasters to the copy. Tedious but it's a fix for now.

[MikeBallard]

These Environment settings all effect the output of raster calculator. You can set environments before running raster calculator:

Cell Size, Current Workspace, Mask, Output Coordinate System, Extent, Scratch Workspace, Snap Raster

http://resources.arcgis.com/en/help/main/10.2/index.html#//001w00000034000000

Your workaround sounds like a normal approach. The basic concept for geoprocessing is input> tool> output. Moat often they way to 'change' data is to process it into a new form.

Mike Ballard, Professor

Geographic Information Systems

Algonquin College

http://lyceum.algonquincollege.com/roomfinder/index.html?poi=t336b

Sent from my TU65 dual DECTape