topic Aspect algorithm for cells at the edge of raster?? in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/aspect-algorithm-for-cells-at-the-edge-of-raster/m-p/44235#M553 <HTML><HEAD></HEAD><BODY><SPAN>hi I need compute Aspect without using Aspect Tool in ArcMap i use algorithm which is in help.. </SPAN><A href="http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=How%20Aspect%20works">http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=How%20Aspect%20works</A><SPAN>&nbsp; but question is how can i compute aspect at the edge of the raster where is impossible create matrix 3x3? (or if there is some noData in matrix)&nbsp; At the bottom of help there is example how to compute aspect for center cell in matrix&nbsp; 3 x 3. but i dont´t understand how algorithm works for others cells.. do you have any idea??&nbsp; thanks a lot.</SPAN></BODY></HTML> Fri, 07 Jan 2011 06:39:56 GMT martinmaretta 2011-01-07T06:39:56Z Aspect algorithm for cells at the edge of raster?? https://community.esri.com/t5/arcgis-spatial-analyst-questions/aspect-algorithm-for-cells-at-the-edge-of-raster/m-p/44235#M553 <HTML><HEAD></HEAD><BODY><SPAN>hi I need compute Aspect without using Aspect Tool in ArcMap i use algorithm which is in help.. </SPAN><A href="http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=How%20Aspect%20works">http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=How%20Aspect%20works</A><SPAN>&nbsp; but question is how can i compute aspect at the edge of the raster where is impossible create matrix 3x3? (or if there is some noData in matrix)&nbsp; At the bottom of help there is example how to compute aspect for center cell in matrix&nbsp; 3 x 3. but i dont´t understand how algorithm works for others cells.. do you have any idea??&nbsp; thanks a lot.</SPAN></BODY></HTML> Fri, 07 Jan 2011 06:39:56 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/aspect-algorithm-for-cells-at-the-edge-of-raster/m-p/44235#M553 martinmaretta 2011-01-07T06:39:56Z Re: Aspect algorithm for cells at the edge of raster?? https://community.esri.com/t5/arcgis-spatial-analyst-questions/aspect-algorithm-for-cells-at-the-edge-of-raster/m-p/44236#M554 <HTML><HEAD></HEAD><BODY><SPAN>thanks a lot. very helpfull.</SPAN></BODY></HTML> Mon, 10 Jan 2011 06:54:31 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/aspect-algorithm-for-cells-at-the-edge-of-raster/m-p/44236#M554 martinmaretta 2011-01-10T06:54:31Z