I downloaded from internet a shp. File containing only one contour line layer. When I was trying to generate slope analysis using “Slope” Tool, an error message “One or more dropped items were invalid and will not be added to the control” popped out and I could not proceed from this point on. I googled and approached couple of attempts:
- Drag dataset into “input raster”, rather the layer itself;
- Convert the dataset to interger data type by using “ArcToolbox / Spatial Analyst Tools / Math / Int” tool;
- Rasterize the polylines to raster by using “Polyline to Raster” tool;
- Export the shp. File to CAD and attempted to use sketchup plugin to do the slope analysis ——GIS showed the exporting is successful while the CAD file is not showing up in the output folder….
None of them worked ….Running out of ideas…..let me know if this explains my question clearly and if you guys know where could the problem be?