topic tif. georeference images not recognised in image analysis in Data Management Questions https://community.esri.com/t5/data-management-questions/tif-georeference-images-not-recognised-in-image/m-p/315472#M18087 <HTML><HEAD></HEAD><BODY><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I have two images a GLOBCOVER and MOD44B image, both have been georeferenced to the same projection of WGS_1984 and i wish to compare the spatial extent of vegetation cover in the two images. However when i attempt to use the image analysis tool in arc map 10. when i select the layers it does not allow me to perform any function such as the difference tool as the icons are not available. Is there a way to make these avaiable? </SPAN><BR /><BR /><SPAN>thanks</SPAN></BODY></HTML> Thu, 03 Mar 2011 09:54:31 GMT SophieCosstick 2011-03-03T09:54:31Z tif. georeference images not recognised in image analysis https://community.esri.com/t5/data-management-questions/tif-georeference-images-not-recognised-in-image/m-p/315472#M18087 <HTML><HEAD></HEAD><BODY><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I have two images a GLOBCOVER and MOD44B image, both have been georeferenced to the same projection of WGS_1984 and i wish to compare the spatial extent of vegetation cover in the two images. However when i attempt to use the image analysis tool in arc map 10. when i select the layers it does not allow me to perform any function such as the difference tool as the icons are not available. Is there a way to make these avaiable? </SPAN><BR /><BR /><SPAN>thanks</SPAN></BODY></HTML> Thu, 03 Mar 2011 09:54:31 GMT https://community.esri.com/t5/data-management-questions/tif-georeference-images-not-recognised-in-image/m-p/315472#M18087 SophieCosstick 2011-03-03T09:54:31Z Re: tif. georeference images not recognised in image analysis https://community.esri.com/t5/data-management-questions/tif-georeference-images-not-recognised-in-image/m-p/315473#M18088 <HTML><HEAD></HEAD><BODY><SPAN>Greetings,</SPAN><BR /><BR /><SPAN>There is certain validation that happens when you select your layers. I believe for difference to work you will need two single band images. So, you could either extract the individual bands that you want to compare, or merge the multispectral into single band products (e.g. using NDVI) and then compare that.</SPAN><BR /><SPAN>Does that help?</SPAN><BR /><BR /><SPAN>Robert</SPAN></BODY></HTML> Thu, 03 Mar 2011 17:31:07 GMT https://community.esri.com/t5/data-management-questions/tif-georeference-images-not-recognised-in-image/m-p/315473#M18088 RobertBerger 2011-03-03T17:31:07Z