This article explains how to calculate the centroid of a polygon in ESRI ArcMap 9.3. Before calculating a centroid, ensure your shapefiles are projected properly.
- Skill level:
- Moderately Challenging
Things you need
- ESRI ArcMap 9.3
- Projected shapefiles
Open ArcMap 9.3.
Click "Add Data" and add the shapefile you wish to calculate a centroid for (this tool can calculate the centroid for multiple polygons at the same time as long as they are in one data file; if you have more than one data file, you will need to repeat the process for each file).
Click "Show/Hide ArcToolbox Window" to display the ArcToolbox if it is not already active.
Open the "Data Management" Toolbox by clicking the minus sign next to the Toolbox.
Open the "Features" Toolbox by clicking the minus sign next to the Toolbox.
Double-click the "Feature To Point" Toolbox to open its dialogue box.
Click the drop-down arrow on the "Input Features" box in the "Feature To Point" dialogue window.
Locate the shapefile in the drop-down list for which you would like to calculate the centroid and select it by clicking on it.
Change the name of the output shapefile, if necessary, in the "Output Feature Class" drop-down box in the "Feature To Point" dialogue window.
Click "OK." The process will run and automatically add the new shapefile to the existing data layer, and display the centroid of the polygon as a point.
Right-click on the newly created centroid shapefile and select "Open Attribute Table" to view the latitude and longitude coordinates of the centroid.
Calculating a Centroid
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