topic Lightning Data Analysis in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/lightning-data-analysis/m-p/250294#M8570 <HTML><HEAD></HEAD><BODY><SPAN>Hi I am new to model builder in GIS.&nbsp; I have two shapefiles, one is a polygon shapefile of all lightning caused fire in Alaska sine 1939 (~1500 polygons) and the second is a point shapefile with all recorded lightning strike since 1986 in Alaska (~10000 points).&nbsp; What I want to do is create a data/attribute table that outputs the following for varying time scale (1 day through 16 weeks):</SPAN><BR /><SPAN>1)If the fire had a lightning strike within it on the timescale specified and latitude/longitude of strike</SPAN><BR /><SPAN>2)If not what is the nearest strike and its distance (point (lightning) to centroid (fire polygon)or point to nearest edge)</SPAN><BR /><SPAN>3)Polarity of strike</SPAN><BR /><SPAN>4)Multiplicity of strike</SPAN><BR /><SPAN>The attribute table I have for the lightning data has all strike lat/long, polarity, multiplicity.&nbsp; This is a flow chart of the analysis I want to do:</SPAN><BR /><BR /><SPAN>select lightning and fire that falls in specified time (I have dates of both strikes and fire) --&gt;&nbsp; determine if a strike was in the fire --&gt; if yes then put the specified value from the lightning table into the new table along with fire ID --&gt;&nbsp; If no find the nearest strike to the fire and its distance to the fire --&gt; add specified values for this strike to same table </SPAN><BR /><BR /><SPAN>What would the basic outline for a model that performs this flow look like? Are there any alternate methods to achieve this with such a large data set? I know this is a lot but any help would be greatly appreciated.&nbsp; Thanks</SPAN></BODY></HTML> Thu, 21 Feb 2013 17:35:05 GMT ZacharyOsterholz 2013-02-21T17:35:05Z Lightning Data Analysis https://community.esri.com/t5/geoprocessing-questions/lightning-data-analysis/m-p/250294#M8570 <HTML><HEAD></HEAD><BODY><SPAN>Hi I am new to model builder in GIS.&nbsp; I have two shapefiles, one is a polygon shapefile of all lightning caused fire in Alaska sine 1939 (~1500 polygons) and the second is a point shapefile with all recorded lightning strike since 1986 in Alaska (~10000 points).&nbsp; What I want to do is create a data/attribute table that outputs the following for varying time scale (1 day through 16 weeks):</SPAN><BR /><SPAN>1)If the fire had a lightning strike within it on the timescale specified and latitude/longitude of strike</SPAN><BR /><SPAN>2)If not what is the nearest strike and its distance (point (lightning) to centroid (fire polygon)or point to nearest edge)</SPAN><BR /><SPAN>3)Polarity of strike</SPAN><BR /><SPAN>4)Multiplicity of strike</SPAN><BR /><SPAN>The attribute table I have for the lightning data has all strike lat/long, polarity, multiplicity.&nbsp; This is a flow chart of the analysis I want to do:</SPAN><BR /><BR /><SPAN>select lightning and fire that falls in specified time (I have dates of both strikes and fire) --&gt;&nbsp; determine if a strike was in the fire --&gt; if yes then put the specified value from the lightning table into the new table along with fire ID --&gt;&nbsp; If no find the nearest strike to the fire and its distance to the fire --&gt; add specified values for this strike to same table </SPAN><BR /><BR /><SPAN>What would the basic outline for a model that performs this flow look like? Are there any alternate methods to achieve this with such a large data set? I know this is a lot but any help would be greatly appreciated.&nbsp; Thanks</SPAN></BODY></HTML> Thu, 21 Feb 2013 17:35:05 GMT https://community.esri.com/t5/geoprocessing-questions/lightning-data-analysis/m-p/250294#M8570 ZacharyOsterholz 2013-02-21T17:35:05Z Re: Lightning Data Analysis https://community.esri.com/t5/geoprocessing-questions/lightning-data-analysis/m-p/250295#M8571 <HTML><HEAD></HEAD><BODY><SPAN>Seems like you just need to run the </SPAN><A href="http://resources.arcgis.com/en/help/main/10.1/index.html#/Intersect/00080000000p000000/">Intersect </A><SPAN>tool (or </SPAN><A href="http://resources.arcgis.com/en/help/main/10.1/index.html#/Spatial_Join/00080000000q000000/">Spatial Join</A><SPAN>).&nbsp; The output will be a point feature class with all the attributes of the lighting strikes and the attributes of the fire polygons they fall within.&nbsp; You could then run attribute queries on this output.&nbsp; </SPAN><BR /><BR /><SPAN>If a fire polygon doesn't have a lighting strike within it, then the output feature class from Intersect won't contain any features that have that polygon's OBJECTID or attributes.&nbsp; You could then select these "no strikes within" polygons and run </SPAN><A href="http://resources.arcgis.com/en/help/main/10.1/index.html#/Generate_Near_Table/00080000001n000000/">Generate Near Table</A><SPAN> to find the closest strike.</SPAN></BODY></HTML> Thu, 21 Feb 2013 23:44:16 GMT https://community.esri.com/t5/geoprocessing-questions/lightning-data-analysis/m-p/250295#M8571 DaleHoneycutt 2013-02-21T23:44:16Z