Changing a Raster's Extent

[JordanKramer]

A friend of mine sent me some raster files. The raster files are good in every way, except for the extent. The extent of the raster file is completely off. I know what the new extents need to be, but I have no idea how to change them. If you know how to change a raster's extent, please post it.

[MelitaKennedy]

A friend of mine sent me some raster files. The raster files are good in every way, except for the extent. The extent of the raster file is completely off. I know what the new extents need to be, but I have no idea how to change them. If you know how to change a raster's extent, please post it.

Hi,

There are two issues that may be occurring.

1) the rasters are not georeferenced. The extents reflect the number of cells in the raster like 0.5,0.5 to 999.5,999.5.

If this is the case, see

Fundamentals for georeferencing a raster dataset

2) The raster has no coordinate system information, so ArcMap isn't able to project it on-the-fly (in memory) to match your other data. In this case, you need to define the coordinate system. Once that's done, you can use the Project Raster tool to create a copy in a different coordinate system.

Defining or modifying a rasters coordinate system

Melita