Peut-on extraire un quartier individuel d'un shapefile ?

Question

<\/HEAD>Bonjour ! Je suis assez nouveau en GIS et j'apprends encore à m'y retrouver. J'essaie d'utiliser l'outil intersect pour trouver l'intersection entre deux couches de fonctionnalités, mais je voudrais cartographier l'intersection d'un quartier avec son bassin versant qui se chevauche. Le shapefile original contient des comtés délimités et je voudrais en extraire un du shapefile original pour utiliser l'outil intersect dessus. Chaque comté est un polygone et possède un GlobalID.<\/P> <\/P> Quelqu'un peut-il m'aider s'il vous plaît ?<\/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!