I'm trying to calculate the slope (in %) in ArcGis 9.3, but don't remember how it works.
I already did it some time ago, but this time it doesn't work... I used a shapefile with Isolines (see picture).. This is how i did it the first time :
Spatial Analyst Tools -> Interpolation -> From Topo to Raster
I use my Shapefile and under "Field" i select "Altitude", and under "Outpull cell size" i chose 5. All the other settings i don't change.
With my Output Raster : Spatial Analyst Tools -> Surface -> Slope (i select "Percent")
With this Output Raster : Spatial Analyst Tools -> Reclass -> Reclassify
My question: is this the right way to calculated the slope?
The problem is that i can't do it this way this time. When i try to do the first step "From Topo to Raster", i have an ERROR message (ERROR 010067).
I hope you guys can help me and tell me what i'm doing wrong!