Create DEM

Create DEM

Create DEM

1. Open the application ILWIS 3.3 Academic
2. Click the All Object to remove all objects
3. Click to view the segment Segment Maps folder file we created earlier
4. Right click on the file and select Open Topo
5. A check on the info> OK
6. trying to navigate the mouse pointer over the lines and going out info neighbor topology of a map> close the window when finished
7. Right click on Topo again> select Contour Interpolation ...
8. Add GeoReference click the button beside the field georefence
9. Give it a name like Best_GeoRef
10. Fill Pixel Size with 5> OK
11. Click Show if you want to see results
12. You will see a map of the results to be colored contour map and there are no lines anymore
13. Close window DEM> Click the Raster Map TopoRasterized file that appears
14. double click or right click open on TopoRasterized> OK
15. The lines will look tepotong topography into pieces when brought near
16. Close window> click the folder back segment> Right click on the topo
17. Select Rasterize> Segment to Raster ...
18. Choose GeoReference be Best_GeoRef> Show> OK
19. Select Point folder> right click on the Pick> select Rasterize> point to raster> GeoReference> Besk_GeoRef> show> OK
20. If nothing happens, add a layer by clicking the Add Layer icon> select Pick the top> OK
21. Back click Rater folder to check what we have made earlier
22. Write "Topo_pick = iff (isundef (pick), topo, pick)" in Command line
23. Then click Show to see the results> OK
24. Write "DEM_topo_pick = mapinterpolcontour (topo_pick)"> show
25. Contour map will appear that looks more presentable and will appear as well DEM_topo_pick file
26. DEM_topo_pick right click> Image Processing> filter ...
27. Filter Type> Average, Output fill with DEM_av> show> OK
28. Delete all files and folders raster except Back_ground DEM_av


For more details see the following video tutorial

or can be downloaded here

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