2 replies to this topic

[kthouz]

I am a beginner to GIS. I have digitized already topographic contour lines of a certain map using a line shapefile. I am using an old Arcview GIS 3.2a as software.
My main objective is to calculate the slope of that region. However, when I try to transform these lines into grid theme, I get many grid lines separated by large nodata intervals. The map seem to be not continuous.
To overcome this problem, I am thinking about:
1. convert polylines into DEM
2. convert DEM into grid theme
3.calculate slope using model builder.

Can anyone tell me how I can convert that polyline shapefile into a DEM file?
Alternatively, is it possible to convert .aux into DEM files?

[dav]

hi,


unfortunately I don't know arcGIS 3.2a. But at least in newer ArcGIS version (with spatial analyst) there's the function Topo To Raster. You just add the contour line file and select the elevation field and run the process. Global Mapper also offers a function for creating raster data out of contour or point data.

does this help?

[Oleg]

Hello,
Take a look at the following links:

http://bit.ly/dFtSaB http://bit.ly/gfMUbh - ArcView Spatial Analyst
http://bit.ly/hcHqyD - ArcView 3D Analyst

+
http://bit.ly/eAh1uD - DEM: Vector -> TIN -> GRID
http://www.ian-ko.co...e_UserGuide.htm (for 9.x)