topic Hec Georas - Inputting manning n values from an existing raster file in Data Management Questions https://community.esri.com/t5/data-management-questions/hec-georas-inputting-manning-n-values-from-an/m-p/293416#M16844 <HTML><HEAD></HEAD><BODY><SPAN>Hello. </SPAN><BR /><BR /><SPAN>I want to create a layer with mannings n values on my map. In the manual it seems the only way of doing this is creating a LandUse layer, drawing on polygons manually and assigning them respective mannings n values. </SPAN><BR /><BR /><SPAN>I have a raster file that contains mannings n values for my entire map area and it would be far quicker to extract n values directly from this layer than go through the whole process manually (creating a new land use layer). However, I cannot find an explanation of how to do this anywhere, or if it is possible! Has anyone else tried this? My raster file is not complex and just consists of many shapes with assigned n values (there are only 6 different n values in total on the map). The only alternative I can think of is to trace around these areas and create the LandUse file as in the manual but it will be incredibly time consuming! </SPAN><BR /><BR /><SPAN>Any thoughts would be much appreciated</SPAN><BR /><BR /><SPAN>Many thanks, Kate.</SPAN></BODY></HTML> Thu, 21 Feb 2013 11:56:03 GMT KateFeloy 2013-02-21T11:56:03Z Hec Georas - Inputting manning n values from an existing raster file https://community.esri.com/t5/data-management-questions/hec-georas-inputting-manning-n-values-from-an/m-p/293416#M16844 <HTML><HEAD></HEAD><BODY><SPAN>Hello. </SPAN><BR /><BR /><SPAN>I want to create a layer with mannings n values on my map. In the manual it seems the only way of doing this is creating a LandUse layer, drawing on polygons manually and assigning them respective mannings n values. </SPAN><BR /><BR /><SPAN>I have a raster file that contains mannings n values for my entire map area and it would be far quicker to extract n values directly from this layer than go through the whole process manually (creating a new land use layer). However, I cannot find an explanation of how to do this anywhere, or if it is possible! Has anyone else tried this? My raster file is not complex and just consists of many shapes with assigned n values (there are only 6 different n values in total on the map). The only alternative I can think of is to trace around these areas and create the LandUse file as in the manual but it will be incredibly time consuming! </SPAN><BR /><BR /><SPAN>Any thoughts would be much appreciated</SPAN><BR /><BR /><SPAN>Many thanks, Kate.</SPAN></BODY></HTML> Thu, 21 Feb 2013 11:56:03 GMT https://community.esri.com/t5/data-management-questions/hec-georas-inputting-manning-n-values-from-an/m-p/293416#M16844 KateFeloy 2013-02-21T11:56:03Z Re: Hec Georas - Inputting manning n values from an existing raster file https://community.esri.com/t5/data-management-questions/hec-georas-inputting-manning-n-values-from-an/m-p/293417#M16845 <HTML><HEAD></HEAD><BODY><A href="http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//001200000008000000">Check out the raster to polygon tool.</A><SPAN>&nbsp; </SPAN><A href="http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Raster_to_Polyline/001200000009000000/">Or the raster to polyline tool</A><SPAN>.</SPAN></BODY></HTML> Thu, 21 Feb 2013 17:39:07 GMT https://community.esri.com/t5/data-management-questions/hec-georas-inputting-manning-n-values-from-an/m-p/293417#M16845 JoeBorgione 2013-02-21T17:39:07Z