Kann ein einzelner Wahlbezirk aus einer Shapefile extrahiert werden?

Question

<\/HEAD>Hallo! Ich bin ziemlich neu im Bereich GIS und lerne noch, mich zurechtzufinden. Ich versuche, das Intersect-Werkzeug zu verwenden, um die Schnittmenge zwischen zwei Feature-Layern zu finden, aber ich möchte die Schnittmenge eines Wahlbezirks mit seinem überlappenden Einzugsgebiet kartieren. Die ursprüngliche Shapefile enthält abgegrenzte Landkreise und ich möchte einen davon aus der ursprünglichen Shapefile extrahieren, um das Intersect-Werkzeug darauf anzuwenden. Jeder Landkreis ist ein Polygon und hat eine GlobalID.<\/P> <\/P> Kann mir bitte jemand dabei helfen? <\/P><\/DIV><\/BODY><\/HTML>

LukasFalk · Accepted Answer

Hello Jamie!

Welcome to the wonderful world of GIS!  So it sounds like you would like to export a feature class containing only one specific county polygon from the greater county polygon layer.  I'll outline this workflow as it pertains to ArcGIS Pro although the workflow is essentially the same within ArcMap.

In order to export a single county polygon, you would first want to do a select by attributes on your county polygon layer.  You can find information about how to select by attributes at the URL below. You will want to open the Select Layer by Attribute pane first, this can be done by clicking the Map tab, going to the Selection group and clicking Select by Attributes.  Next you will want to set the selection type to New Selection.  Finally you will want to create a clause.  In your case, this will look something like Where County_Name is equal to "_____".  The blank space there would then be filled with the desired county.  You mentioned that the counties have global ID's so you could also do something like Where Global_ID is equal to "____".  After authoring the clause, run the tool.

Select features using attributes—ArcGIS Pro | Documentation

This will select the desired county.  Next, right click the counties layer in the Contents pane, go to Data, and Export Features.  This will open the Feature Class to Feature Class tool.  Simply specify an output name and location and your golden!

Hopefully this helps you out!