topic Finding the centroid of a multipart polyline in ArcGIS 9.2, Arcview License in ArcGIS Network Analyst Questions https://community.esri.com/t5/arcgis-network-analyst-questions/finding-the-centroid-of-a-multipart-polyline-in/m-p/281999#M2773 <HTML><HEAD></HEAD><BODY><SPAN>Hi folks,</SPAN><BR /><BR /><SPAN>I'm attempting to find the centroid of a multipart polyline while using ArcGIS 9.2, with the ArcView license. I have access to Network Analyst and Spatial Analyst extensions.</SPAN><BR /><BR /><SPAN>I have used Network Analyst on a river network, and used x/y coordinates of existing fish locations with a dispersal estimate to extract the river segments within a 1km network of each of my data points, resulting in several discrete "clouds" of line segments. My goal is to find the total length of the cloud and x/y coordinate for each of the clouds. </SPAN><BR /><BR /><SPAN>When the clouds are close enough together, they merge together. I merged them by creating a buffer around each of the line segments, dissolving the buffers, assigning an ID to each resulting buffer, performing a spatial join of the buffer to the river line segments to assign the segments their ID, and then dissolving by ID to result in multipart polylines. I have been able to calculate length of these polylines, but I have not been able to adequately calculate&nbsp; centroids. I have used the x/y coordinate code from Ian-ko, and used the "Tools for Graphics and Shapes" by Jenness, to no avail. They calculate the middle of a polyline perfectly for polylines with no branches, but give strange results for when a polyline branches in the manner that rivers typically do. I have attached an example of what I mean, where the dark lines are my overall river network, the lighter lines are the discrete "clouds", and the dots are the currently calculated centroids. </SPAN><BR /><BR /><SPAN>What I am looking for is a way to calculate a weighted centroid, so that the point is in the middle of the multipart polyline with a roughly equal length on both sides, useble with an ArcView license. Does such a method exist?</SPAN><BR /><BR /><SPAN>Josh Mailhiot</SPAN><BR /><SPAN>Aquatic Science Biologist</SPAN><BR /><SPAN>Fisheries and Oceans Canada</SPAN></BODY></HTML> Mon, 31 May 2010 19:45:50 GMT JoshuaMailhiot 2010-05-31T19:45:50Z Finding the centroid of a multipart polyline in ArcGIS 9.2, Arcview License https://community.esri.com/t5/arcgis-network-analyst-questions/finding-the-centroid-of-a-multipart-polyline-in/m-p/281999#M2773 <HTML><HEAD></HEAD><BODY><SPAN>Hi folks,</SPAN><BR /><BR /><SPAN>I'm attempting to find the centroid of a multipart polyline while using ArcGIS 9.2, with the ArcView license. I have access to Network Analyst and Spatial Analyst extensions.</SPAN><BR /><BR /><SPAN>I have used Network Analyst on a river network, and used x/y coordinates of existing fish locations with a dispersal estimate to extract the river segments within a 1km network of each of my data points, resulting in several discrete "clouds" of line segments. My goal is to find the total length of the cloud and x/y coordinate for each of the clouds. </SPAN><BR /><BR /><SPAN>When the clouds are close enough together, they merge together. I merged them by creating a buffer around each of the line segments, dissolving the buffers, assigning an ID to each resulting buffer, performing a spatial join of the buffer to the river line segments to assign the segments their ID, and then dissolving by ID to result in multipart polylines. I have been able to calculate length of these polylines, but I have not been able to adequately calculate&nbsp; centroids. I have used the x/y coordinate code from Ian-ko, and used the "Tools for Graphics and Shapes" by Jenness, to no avail. They calculate the middle of a polyline perfectly for polylines with no branches, but give strange results for when a polyline branches in the manner that rivers typically do. I have attached an example of what I mean, where the dark lines are my overall river network, the lighter lines are the discrete "clouds", and the dots are the currently calculated centroids. </SPAN><BR /><BR /><SPAN>What I am looking for is a way to calculate a weighted centroid, so that the point is in the middle of the multipart polyline with a roughly equal length on both sides, useble with an ArcView license. Does such a method exist?</SPAN><BR /><BR /><SPAN>Josh Mailhiot</SPAN><BR /><SPAN>Aquatic Science Biologist</SPAN><BR /><SPAN>Fisheries and Oceans Canada</SPAN></BODY></HTML> Mon, 31 May 2010 19:45:50 GMT https://community.esri.com/t5/arcgis-network-analyst-questions/finding-the-centroid-of-a-multipart-polyline-in/m-p/281999#M2773 JoshuaMailhiot 2010-05-31T19:45:50Z