I am working with some .flt files from Whitebox. When I try to extract values to points, it spits out a layer that says "null" for all of my raster values. The layers definitely overlap, and I think my problem is that my .flt file doesn't have attributes. Here are things that I hhave tried:
1) convert my .flt file to a raster, and then give it some attributes. This breaks down at the "Build Raster Attribute Table" because if I follow directions completely and turn it into a 32 bit signed integer there are only two entries in my new attribute table; and if I don't follow those directions and choose the 32 bit float option, it tells me that only "single band integers" are valid.
2) I have also tried straight up converting the float file to a raster in ArcGIS, which tells me it can't because I don't have an attribute table.
Suggestions?
1) convert my .flt file to a raster, and then give it some attributes. This breaks down at the "Build Raster Attribute Table" because if I follow directions completely and turn it into a 32 bit signed integer there are only two entries in my new attribute table; and if I don't follow those directions and choose the 32 bit float option, it tells me that only "single band integers" are valid.
2) I have also tried straight up converting the float file to a raster in ArcGIS, which tells me it can't because I don't have an attribute table.
Suggestions?
Do the float values appear when you click on the raster with the identify tool in ArcMap? Do the statistics look correct? You may have to build raster statistics for your raster (right click in the catalog window) for everything to work okay.
The Extract Values To Points, Extract Multi-Values to Points and Sample tools all pretty much do the same thing. Sometimes I use one when the others will not work right with a certain data format, projecting on the fly, whatever. So, try the Sample tool and see if you have better luck.