topic Hi! I am trying to use ArcMap 10.4 scatterplot matrix to show the correlation between tornado strength and elevation. I have a 10m DEM (32-bit floating point) for the state, along with survey points. I'm having trouble converting the DEM raster values to in Alabama GIS Users Questions https://community.esri.com/t5/alabama-gis-users-questions/hi-i-am-trying-to-use-arcmap-10-4-scatterplot/m-p/865622#M14 <HTML><HEAD></HEAD><BODY><P>Hi! I am trying to use ArcMap 10.4 scatterplot matrix to show the correlation between tornado strength and elevation. I have a 10m DEM (32-bit floating point) for the state, along with survey points. I'm having trouble converting the DEM raster values to point values, in order to graph them on the scatterplot. When I use Spatial Analyst's "Extract Values by Points" tool, and it keeps giving me -9999 placeholders for the elevation column. I checked and both of my spatial references are NAD83 UTM, so it's not a spatial/projection issue. I can't figure it out. HELP!</P></BODY></HTML> Mon, 24 Oct 2016 03:12:12 GMT WhitneyHenson 2016-10-24T03:12:12Z Hi! I am trying to use ArcMap 10.4 scatterplot matrix to show the correlation between tornado strength and elevation. I have a 10m DEM (32-bit floating point) for the state, along with survey points. I'm having trouble converting the DEM raster values to https://community.esri.com/t5/alabama-gis-users-questions/hi-i-am-trying-to-use-arcmap-10-4-scatterplot/m-p/865622#M14 <HTML><HEAD></HEAD><BODY><P>Hi! I am trying to use ArcMap 10.4 scatterplot matrix to show the correlation between tornado strength and elevation. I have a 10m DEM (32-bit floating point) for the state, along with survey points. I'm having trouble converting the DEM raster values to point values, in order to graph them on the scatterplot. When I use Spatial Analyst's "Extract Values by Points" tool, and it keeps giving me -9999 placeholders for the elevation column. I checked and both of my spatial references are NAD83 UTM, so it's not a spatial/projection issue. I can't figure it out. HELP!</P></BODY></HTML> Mon, 24 Oct 2016 03:12:12 GMT https://community.esri.com/t5/alabama-gis-users-questions/hi-i-am-trying-to-use-arcmap-10-4-scatterplot/m-p/865622#M14 WhitneyHenson 2016-10-24T03:12:12Z Re: Hi! I am trying to use ArcMap 10.4 scatterplot matrix to show the correlation between tornado strength and elevation. I have a 10m DEM (32-bit floating point) for the state, along with survey points. I'm having trouble converting the DEM raster values https://community.esri.com/t5/alabama-gis-users-questions/hi-i-am-trying-to-use-arcmap-10-4-scatterplot/m-p/865623#M15 <HTML><HEAD></HEAD><BODY><P><A class="link-titled" href="http://desktop.arcgis.com/en/arcmap/latest/tools/spatial-analyst-toolbox/extract-multi-values-to-points.htm" title="http://desktop.arcgis.com/en/arcmap/latest/tools/spatial-analyst-toolbox/extract-multi-values-to-points.htm">Extract Multi Values to Points—Help | ArcGIS for Desktop</A>&nbsp;</P><P>As long as you haven't used the Define Projection tool during your workflow... you are probably good..</P><P>Always examine the extents of your rasters in the properties dialog to confirm that the extents do indeed overlap. &nbsp;If one file looks like it is in geographic coordinates and the others in projected, make sure you use the Project Tool to get them both in projected coordinates.</P></BODY></HTML> Mon, 24 Oct 2016 03:18:48 GMT https://community.esri.com/t5/alabama-gis-users-questions/hi-i-am-trying-to-use-arcmap-10-4-scatterplot/m-p/865623#M15 DanPatterson_Retired 2016-10-24T03:18:48Z Re: Hi! I am trying to use ArcMap 10.4 scatterplot matrix to show the correlation between tornado strength and elevation. I have a 10m DEM (32-bit floating point) for the state, along with survey points. I'm having trouble converting the DEM raster values https://community.esri.com/t5/alabama-gis-users-questions/hi-i-am-trying-to-use-arcmap-10-4-scatterplot/m-p/865624#M16 <HTML><HEAD></HEAD><BODY><P>-9999 sounds like no data values in any event</P></BODY></HTML> Fri, 27 Oct 2017 13:14:35 GMT https://community.esri.com/t5/alabama-gis-users-questions/hi-i-am-trying-to-use-arcmap-10-4-scatterplot/m-p/865624#M16 DanPatterson_Retired 2017-10-27T13:14:35Z