5.1             Polygon To Line

 

The geo-data feature can exist as point, line or polygon objects. In order to merge all the data features together before it can be used by a domain decomposition code, the object properties for all the features should be same. So polygons like lake feature and subsheds are converted to polylines before they can be merged with already existing line features like river. Figure x.x shows a schematic of the steps involved in the algorithm.

 

Representative Polygon

Identify Junction Points

Ignore common polylines

Final Polylines

 

First of all add shape file(s) of “polygon” type using the + button on the top right of the dialog. A default output file name for the corresponding polyline file is generated which is editable if desired. - button can be used to remove any file from the simplification routine by selecting the file from the left bar of the spread sheet. x button clears everything from the dialog setting it afresh. After adding the polygon files module is ready to execute using Run button. The text browser provides information regarding any error or processing. After the operation is complete for all the files it is required to Close the dialog to processed to next step.