Digitizing Polygon (Catchment)

Digitizing Polygon (Catchment)

Digitizing Polygon (Catchment)

in digitizing a map there is an area or region that we call the polygon area, the following are the steps
1. Open the application ILWIS 3.3 Academic
2. Open the file Back_Ground> OK
3. File> Create> Segment Map ..
4. Fill in the folder name with Cathment_Boundary> OK
5. Do not forget to replace the snap and tunnel tolerance to 0 to move the file click> customize
6. Draw a line with an existing image in the map with the pen tool in the main toolbar there. Lines should be connected from the first point and the last point
7. When finished click the image marks the file> Polygonize ...
8. Fill in the catchment polygon output alone
9. add the domain with the click of a button caara its domain sampig field
10. Fill in the Catchment domain Name> OK
11. close the window and click OK
12. Log in polygon editor window to give domain to the polygon attribute that we created earlier
13. Right click> select New
14. And fill in accordance with the data we get from the map

For more details see the following video tutorial

or can be downloaded here

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