I am wondering how to or if it is possible to crop a SPOT satellite image (the image has black edges) using ArcMap 10 and if so how do you do this.
Keep in mind that all imagery will have a bounding box based on the rectangular extent of data. Even the results from Extract by Mask have a rectangular bounding box where values outside of the region of interest are assigned NoData values. In other cases, data outside of your area of interest, yet within the bounding box are often assigned either 0 or NoData values. How you display these data is up to you. If there is a black collar around your dataset, I recommend two approaches:
- Reassign "collar" values to NoData using the Con (Spatial Analyst) command.
Or choose a different display color for the zone outside of your area of interest
Select the "blue identify" button on the dashboard. Then select the black background to determine the pixel value.
Right click on your raster layer in the table of contents, select Properties > Symbology.
Choose the color display you want.
Check the "Display Background Value" "YOUR_VALUE_HERE" as No Color.
Alternatively, in the same symbology window, "Display NoData as" No Color.
@MAJ742 may be right---but before you run a long geoprocessing task on a big SPOT raster, go into the raster layer's properties, and try setting the Display Background Value to transparent/No Color.
This site at geosoft.com provides some tips (including the image, below), but your looking for the following screen:
Here's another page with some tips, scroll down to the heading "Raster Layer tab".