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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?

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Accepted answers

DanPatterson_Retired

Set the desired extent in the Environments tab of the Copy Raster tool and create a new raster of the desired extent. You cannot change the extent of an existing raster, you can only create new ones that meet your criteria

All comments

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

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

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

MODIS ET extent is 90,-180,180,-60

CHIRPS extent is 50, -180, 180, -50

HAIN extent is 37, -18, 553, -40

I'm guessing it's the, there's nothing I can do option.

DanPatterson_Retired

Possible issues...One of them isn't or it has been defined incorrectly, or they differ in extent. If it is the latter, then there is nothing you can do since the coverage is what it is. Reporting on the 3 file extents would be useful as well projection information.

SarahNiemczura

GCS_WGS_1984

DanPatterson_Retired

what coordinate system/projection are your tiff files in?

SarahNiemczura

Hi Sol,

Good idea.

ArcHelp1.tif

I have to essentially have the rasters have the same starting point for someone who wants to use these in MatLab. So the Chirps and Hain ET need to have the same extent and UL as the MODISET. Does that help?

DanPatterson_Retired

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