Latest Contributions by WeifengHe

‎06-26-2012

Don't know much about python, but I think the log is the same as the other language. When you identify 2 polygons overlap, you can get the intersection of the 2 polygons, and get the area of the intersection. Here is the code snippet in ArcObject. ITopologicalOperator to = PADUSGeom; IArea a = to.Intersect(countyGeom, esriGeometry2Dimension); double area = a.Area;

‎06-22-2012

IRelationalOperator does not support ILine as input geometry, but it takes IPolyline. So in your code, try create a polyline using ISegmentCollection or IPointCollection.

‎06-01-2012

ITopologicalOperator6.SimplifyAsFeature simplify the geometry according to the type of the geometry. If the geometry is multipoint type, the method works just like ITopologicalOperator::Simplify. If the geometry is a polygon, it works as IPolygon::SimplifyPreserveFromTo. If the a polyline, it is the same as IPolyline6::SimplifyNonPlanar. ITopologicalOperator6 does not inherit from other versions of ITopologicalOperator.

‎05-11-2012

Glad it works now. Just for curiousity, how did you code to pull a polyline from the layer?

‎05-11-2012

There is a sample here http://edndoc.esri.com/arcobjects/9.2/ComponentHelp/esriGeoDatabase/IFeatureWorkspace_CreateFeatureClass_Example.htm It is coded in VB, but should not be difficult to rewrite in C#.

‎05-10-2012

Just from the code I don't see any problem. Can you also please provide the input parameters?

‎04-19-2012

There are several ways to merge two polyline features. For example: ITopologicalOperator::Union IGeometryCollection::AddGeometry IPointCollection::AddPointCollection also see examples at http://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#//004800000228000000

‎02-22-2012

When you say not accurate, do you mean the area value not accurate? Are you using an equal area projection in this case?

‎02-10-2012

Is it possible that you share the data? You can identify those not work as expected. Thanks.

‎02-08-2012

Just one question, the polylines you used to create those fromPoint and ToPoint, are they from existing database, or you just created on the fly? are the tolerance for the two spatial reference the same?

‎02-07-2012

From ArcObject level, what I can think of is using ITopologicalOperator::Intersect method. However, the output geometry will not be in 3D, means the operation is performed on the footprint of the input multipatch. There are some 3D Analyst Tools can do 3D intersection. You do need special license for that.

‎02-07-2012

Can you please try esriSpatialRelEnum.esriSpatialRelTouches instead of using esriSpatialRelEnum.esriSpatialRelIntersects and see what happen?

‎02-01-2012

This error message means the input point is not on the polygon boundry. Try to change the second parameter to true.

‎01-30-2012

Such kind of data error usually can be caught by calling ITopologicalOperator::IsSimple or ITopologicalOperator3::IsSimpleEx in your code. You can also run the GeoProcessing Tool Check Geometry from Toolbox.

‎01-27-2012

This is getting interesting. Can you please share your data? Not necessary all the features, just some that overlap but not generating area after the call. Thanks.

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My Ideas

Latest Contributions by WeifengHe

Re: area of overlap between polygons in two different feature classes

Re: Problem with create new ILine or IPolyLine

Re: ITopologicalOperator6.SimplifyAsFeature Method

Re: IBufferConstruction

Re: How to create Shapefile with C# ?

Re: IBufferConstruction

Re: merge two line features

Re: GeometryEngine.buffer Problem

Re: FromPoint does not intersect it's own IPolyline5

Re: FromPoint does not intersect it's own IPolyline5

Re: How to intersect 3D using multipatch

Re: FromPoint does not intersect it's own IPolyline5

Re: "The specified splitting distance is not included in the curve to be split."

Re: Area of overlap between two polygons

Re: Area of overlap between two polygons

Re: Joining geodetically correct polyline segments...