topic Re: Find Line Segment Perpendicular to Point in ArcObjects SDK Questions https://community.esri.com/t5/arcobjects-sdk-questions/find-line-segment-perpendicular-to-point/m-p/236963#M6127 <HTML><HEAD></HEAD><BODY><SPAN>Can you merge (union) all the segments inside the buffer into a single polyline?&nbsp; You could use the polyline's IProximityOperator to querynearest on the point and return a point.</SPAN></BODY></HTML> Fri, 20 Apr 2012 19:00:45 GMT AlexanderGray 2012-04-20T19:00:45Z Find Line Segment Perpendicular to Point https://community.esri.com/t5/arcobjects-sdk-questions/find-line-segment-perpendicular-to-point/m-p/236962#M6126 <HTML><HEAD></HEAD><BODY><SPAN>Hi everyone,</SPAN><BR /><SPAN>I am trying to measure distances between points on a river network.&nbsp; In order to get an accurate distance measure, there has to be a vertex on the river line where each of the points are located.&nbsp; Some of my points can be as far as 10 or so metres away from the river, but I have set an arbitrary "snapping" threshold to 6 metres.&nbsp; I use ITopologicalOperator.Buffer to create a 6 metre buffer around the points and then create an ISpatialFilter to catch all of the river segments that intersect the buffer.&nbsp; In the image I've attached, the blue line represents the river, flowing south-east, the big red dot represents the point I am trying to "snap" and the little red dot represents the point on the stream I want to snap it to, and thus, create a vertex at.&nbsp; The line is split into segments.&nbsp; If I create a cursor to loop through the intersecting segments (of which there are 3 in the picture), the bold segment will be the first one selected.&nbsp; I need a way to tell it that it is in fact the second segment that I need because this is closest to the point.</SPAN><BR /><SPAN>I believe that in order to use IProximityOperator.ReturnNearestPoint I already need to have a </SPAN><SPAN style="font-style:italic;">feature </SPAN><SPAN>(segment) and not a feature class (river) as the input.&nbsp; Any suggestion on how to identify the correct line segment?</SPAN><BR /><SPAN>Thanks.</SPAN></BODY></HTML> Fri, 20 Apr 2012 18:49:19 GMT https://community.esri.com/t5/arcobjects-sdk-questions/find-line-segment-perpendicular-to-point/m-p/236962#M6126 LornaMurison 2012-04-20T18:49:19Z Re: Find Line Segment Perpendicular to Point https://community.esri.com/t5/arcobjects-sdk-questions/find-line-segment-perpendicular-to-point/m-p/236963#M6127 <HTML><HEAD></HEAD><BODY><SPAN>Can you merge (union) all the segments inside the buffer into a single polyline?&nbsp; You could use the polyline's IProximityOperator to querynearest on the point and return a point.</SPAN></BODY></HTML> Fri, 20 Apr 2012 19:00:45 GMT https://community.esri.com/t5/arcobjects-sdk-questions/find-line-segment-perpendicular-to-point/m-p/236963#M6127 AlexanderGray 2012-04-20T19:00:45Z Re: Find Line Segment Perpendicular to Point https://community.esri.com/t5/arcobjects-sdk-questions/find-line-segment-perpendicular-to-point/m-p/236964#M6128 <HTML><HEAD></HEAD><BODY><SPAN>If you are still looking for a solution, take a look at this script; it may be what you are looking for.</SPAN><BR /><BR /><A href="http://resources.arcgis.com/gallery/file/arcobjects-net-api/details?entryID=08EE7306-1422-2418-34D2-34CE0061CAE6">http://resources.arcgis.com/gallery/file/arcobjects-net-api/details?entryID=08EE7306-1422-2418-34D2-34CE0061CAE6</A></BODY></HTML> Tue, 01 May 2012 16:00:16 GMT https://community.esri.com/t5/arcobjects-sdk-questions/find-line-segment-perpendicular-to-point/m-p/236964#M6128 KaushikMysorekar 2012-05-01T16:00:16Z