We have three layers, income, obesity and fast food restaurants for England and we wanted to find districts where they all intercepted. So we did a combination of two layers at a time to find where all three crossed over, but is there a quicker way of doing this in one step??
[GIS] How to intersect more than two layers? Is there a quick way
arcgis-10.0arcgis-desktopgeoprocessingintersection
Related Solutions
Dissolve (Data Management) is a better solution:
Dissolve will work better > http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000005n000000
(Dissolve by Field is Optional)
If your dataset is huge Dissolve can use the Tiling for Large Datasets module > http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//000800000014000000 (aggregate cannot)
You can use ITopologicalOperator Interface for finding intersections. esriGeometry0Dimension gets you the result in points/multipoints.
List<IPoint> resultPoints = new List<IPoint>();
ITopologicalOperator topOperator = (ITopologicalOperator)poly1;
IGeometry resultGeom = (IGeometry)topOperator.Intersect(poly2, esriGeometryDimension.esriGeometry0Dimension);
IGeometryCollection pointCollection = (IGeometryCollection)resultGeom;
for (int i = 0; i < pointCollection.GeometryCount; i++)
{
resultPoints.Add((IPoint)pointCollection.get_Geometry(i));
}
Best Answer
With ArcGIS for Desktop Basic and Standard licenses, the number of input feature classes or layers is limited to two. (source: arcgis help)
So if you don't have the advanced license, you need to run the tool twice. If you want to have the intersect tool for three layers because you will often need it, you can use model builder to make your own reusable "three layer intersect" tool.