Thursday, July 03, 2014

Editing and Topology

1. Create shapefile. Add data, Start editing. Select scale to 1:19,000. (depends)

2. Select Edit tool, Create feature, Select the shapefile on which editing is required, and

Select option for editing. Like:

a. Straight segment for creating vertex each time on 1 click.

b. End point arc segment to create a circular arc

c. Trace to trace the existing features

1. Create Shapefile

2. Add Data

3. Start Editing

4. Select Scale

3. Click on the segment which has to be digitize. Use CtrlZ to go to previous vertex.

4. Always Save Edits and Stop Edit after work has done.

5. The Blue highlighted polygon is showing that it is selected on the run time.

Straight Segment:

Create vertex on

each click

Digitizing vertex

6. For creating topology to check out the errors in digitizing. 1st create a Geo-database

in Arc Catolog.

7. Then create a Feature Datasets. New-Feature Datasets.

Start Edit

Save Edit

Stop Edit

8. Then import the shape-files to Feature class under the Feature datasets.

9. One can import single or multiple feature classes into the Feature dataset.

10. Create topology on the Feature dataset.

11. Add Rule for that particular feature.

12. Open the geo database – feature datasets into the Arc map.

13. Errors are highlighted in Red color. Zoom in to get a close look to error.

14. Errors can be adjusted as per desired option. (Merge, Cut, or Take as exception)

15. Above is a gap error.

a. So, select to create a new feature, then merge or clip.

TIPS:

There are many types of errors, and they can be solved by their given options.

It is best to digitize a major feature, and then cut the polygon.

It is good to clip the feature, after it has been digitized.