topic Spatial Analyst -- Viewshed Problems in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/spatial-analyst-viewshed-problems/m-p/31898#M415 <HTML><HEAD></HEAD><BODY><SPAN>Hello, this is my first post on these forums (they have been very, very helpful so far).</SPAN><BR /><BR /><SPAN>Posted this on the Geoprocessing forum as well.</SPAN><BR /><BR /><BR /><SPAN>I need to get viewsheds for multiple tower locations in an area, so that our Field Wireless team can decide where is the best place to put a tower in order to get the best coverage.</SPAN><BR /><BR /><SPAN>We would like to automate this process, so the Field Wireless guys can run this on their own (without being GIS savvy) and so a GIS Support member doesn't have to stop his/her work to create one of these for the FW people (very time consuming, labor intensive, etc.)</SPAN><BR /><BR /><BR /><SPAN>1. So I am in the process of building a Viewshed model/script that will take an input .csv file from the user (with a list of tower names, latitude, longitude, OFFSETA (tower height), OFFSETB (receiver height), RADIUS1 (minimum radius), RADIUS2 (maximum radius)). </SPAN><BR /><BR /><SPAN>2. Then it will turn that .csv into a shapefile containing all the locations. </SPAN><BR /><BR /><SPAN>3. Then it will break apart that shapefile into a seperate .shp for each location. (I used Dan Patterson's shapefile break Python code for this) THANKS!</SPAN><BR /><BR /><SPAN>4. Then loop through each new .shp and run viewshed analysis on it. Then to account for trees I MINUS the areas with tree cover from the viewshed output to get the final result. (I repeat this process for all locations inputed)</SPAN><BR /><BR /><BR /><SPAN>This model works fine, but I am now getting odd results when running Viewshed Analysis through the model or through the tool in ArcMap. </SPAN><BR /><BR /><SPAN>I get an expected result when using my original .shp files from a few weeks ago.</SPAN><BR /><BR /><SPAN>When using the .shp that I create in the model though, I get for some locations a result that is way off. For some locations it is much better, but still is not the exact same as when using the old shapefiles. </SPAN><BR /><BR /><SPAN>I am baffled by this because when examining the attribute tables of both, they are identical.</SPAN><BR /><SPAN>Does anyone think that they can help me?? I am really struggling with what the problem could be.</SPAN><BR /><BR /><BR /><SPAN>Sorry about being so lengthy, but if anyone has any ideas about the problem I would really appreciate some help. (I am working in 9.3 by the way)</SPAN></BODY></HTML> Tue, 13 Jul 2010 11:55:28 GMT CharlieRoberts 2010-07-13T11:55:28Z Spatial Analyst -- Viewshed Problems https://community.esri.com/t5/arcgis-spatial-analyst-questions/spatial-analyst-viewshed-problems/m-p/31898#M415 <HTML><HEAD></HEAD><BODY><SPAN>Hello, this is my first post on these forums (they have been very, very helpful so far).</SPAN><BR /><BR /><SPAN>Posted this on the Geoprocessing forum as well.</SPAN><BR /><BR /><BR /><SPAN>I need to get viewsheds for multiple tower locations in an area, so that our Field Wireless team can decide where is the best place to put a tower in order to get the best coverage.</SPAN><BR /><BR /><SPAN>We would like to automate this process, so the Field Wireless guys can run this on their own (without being GIS savvy) and so a GIS Support member doesn't have to stop his/her work to create one of these for the FW people (very time consuming, labor intensive, etc.)</SPAN><BR /><BR /><BR /><SPAN>1. So I am in the process of building a Viewshed model/script that will take an input .csv file from the user (with a list of tower names, latitude, longitude, OFFSETA (tower height), OFFSETB (receiver height), RADIUS1 (minimum radius), RADIUS2 (maximum radius)). </SPAN><BR /><BR /><SPAN>2. Then it will turn that .csv into a shapefile containing all the locations. </SPAN><BR /><BR /><SPAN>3. Then it will break apart that shapefile into a seperate .shp for each location. (I used Dan Patterson's shapefile break Python code for this) THANKS!</SPAN><BR /><BR /><SPAN>4. Then loop through each new .shp and run viewshed analysis on it. Then to account for trees I MINUS the areas with tree cover from the viewshed output to get the final result. (I repeat this process for all locations inputed)</SPAN><BR /><BR /><BR /><SPAN>This model works fine, but I am now getting odd results when running Viewshed Analysis through the model or through the tool in ArcMap. </SPAN><BR /><BR /><SPAN>I get an expected result when using my original .shp files from a few weeks ago.</SPAN><BR /><BR /><SPAN>When using the .shp that I create in the model though, I get for some locations a result that is way off. For some locations it is much better, but still is not the exact same as when using the old shapefiles. </SPAN><BR /><BR /><SPAN>I am baffled by this because when examining the attribute tables of both, they are identical.</SPAN><BR /><SPAN>Does anyone think that they can help me?? I am really struggling with what the problem could be.</SPAN><BR /><BR /><BR /><SPAN>Sorry about being so lengthy, but if anyone has any ideas about the problem I would really appreciate some help. (I am working in 9.3 by the way)</SPAN></BODY></HTML> Tue, 13 Jul 2010 11:55:28 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/spatial-analyst-viewshed-problems/m-p/31898#M415 CharlieRoberts 2010-07-13T11:55:28Z