topic Re: Area Solar Radiation - Parameter in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/area-solar-radiation-parameter/m-p/202656#M2861 <HTML><HEAD></HEAD><BODY><SPAN>I would say you should study "Diffuse Proportion" and "Transmittivity" before you use the tool since they refer to parameters associated with the atmosphere.&nbsp; You can vary these parameters to see their affect, but using the defaults would not be appropriate unless they apply to your circumstances</SPAN></BODY></HTML> Fri, 04 Mar 2011 18:47:47 GMT DanPatterson_Retired 2011-03-04T18:47:47Z Area Solar Radiation - Parameter https://community.esri.com/t5/arcgis-spatial-analyst-questions/area-solar-radiation-parameter/m-p/202655#M2860 <HTML><HEAD></HEAD><BODY><SPAN>Hi!</SPAN><BR /><BR /><SPAN>I´m going to use the tool area solar radiation for the first time. To know exactly what I do, I have to understand the used parameters. Maybe some of you can help me to understand them.</SPAN><BR /><BR /><SPAN>Especially the parameters "Diffuse Proportion" and "Transmittivity" are not clear. These parameters are explained very brief. Is there a possibility to determine the values of these parameters in an easy understandable way? How big is the influence if I us the default values?</SPAN><BR /><BR /><SPAN>Are the any other important things I should know before using the tool? </SPAN><BR /><BR /><SPAN>I´m looking forward to many answers.</SPAN><BR /><BR /><SPAN>Thanks</SPAN></BODY></HTML> Fri, 04 Mar 2011 18:03:38 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/area-solar-radiation-parameter/m-p/202655#M2860 TimothyWeyrer 2011-03-04T18:03:38Z Re: Area Solar Radiation - Parameter https://community.esri.com/t5/arcgis-spatial-analyst-questions/area-solar-radiation-parameter/m-p/202656#M2861 <HTML><HEAD></HEAD><BODY><SPAN>I would say you should study "Diffuse Proportion" and "Transmittivity" before you use the tool since they refer to parameters associated with the atmosphere.&nbsp; You can vary these parameters to see their affect, but using the defaults would not be appropriate unless they apply to your circumstances</SPAN></BODY></HTML> Fri, 04 Mar 2011 18:47:47 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/area-solar-radiation-parameter/m-p/202656#M2861 DanPatterson_Retired 2011-03-04T18:47:47Z Re: Area Solar Radiation - Parameter https://community.esri.com/t5/arcgis-spatial-analyst-questions/area-solar-radiation-parameter/m-p/202657#M2862 <HTML><HEAD></HEAD><BODY><SPAN>Sorry, maybe I have explained it a little bit confused. I already know the meaning of them, but how to determine them is not clear for me.</SPAN></BODY></HTML> Fri, 04 Mar 2011 19:10:20 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/area-solar-radiation-parameter/m-p/202657#M2862 TimothyWeyrer 2011-03-04T19:10:20Z Re: Area Solar Radiation - Parameter https://community.esri.com/t5/arcgis-spatial-analyst-questions/area-solar-radiation-parameter/m-p/202658#M2863 <HTML><HEAD></HEAD><BODY><SPAN>You would have to troll the academic papers on methods of estimating diffuse radiation and atmospheric transmissivity to get answer for you particular area, I suspect the provided defaults are global estimates.</SPAN></BODY></HTML> Fri, 04 Mar 2011 19:22:06 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/area-solar-radiation-parameter/m-p/202658#M2863 DanPatterson_Retired 2011-03-04T19:22:06Z