Selection by polygon doesn't work very well

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07-17-2014 10:33 AM
EstelleWuilliez1
New Contributor II

Hello everybody,

 

I am currently working on ArcMap and I am trying to select elements on my map. To do this, I use the tool "Select by polygon" in the toolbar called "Tools". But when I draw the polygon, it selects more elements than I want and I don't know why. Does anyone know what is the problem?

 

Thank you!

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2 Replies
DarrenWiens2
MVP Honored Contributor

Selections work on the entire piece of geometry, so even if you want to select just a portion of a very long line (e.g. a highway) it will select the whole line, if that's how it was digitized. You need to change the geometry, either through editing (cut the line) or geoprocessing (e.g. clip) tools if you want to select a portion of a feature.

EstelleWuilliez1
New Contributor II

Clip seems to be what I need ! But my clip_feature (polygon) is not always the same, it can change and it depends on the user's clicks. Can I use a python script even if my polygon will change?

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