topic How to compute surface of raster or any point using ARCOBJECTS? in ArcObjects SDK Questions https://community.esri.com/t5/arcobjects-sdk-questions/how-to-compute-surface-of-raster-or-any-point/m-p/437060#M11828 <HTML><HEAD></HEAD><BODY><SPAN>I have a raster image whose values are a digital elevation model of terrain.</SPAN><BR /><BR /><SPAN>I need to know the surface type (topographic characterization) of particular points along transects of this DEM.</SPAN><BR /><BR /><SPAN>How to find it?</SPAN><BR /><BR /><SPAN>(In my application I have two points: a transmitter end and receiver end. I find the highest point between the transmitter end and receiver end: see the figure below. I would like to know whether the highest point is smooth or is a knife edge; that is, to within the resolution of the image it appears to be non-differentiable.)[ATTACH=CONFIG]31719[/ATTACH]</SPAN></BODY></HTML> Tue, 25 Feb 2014 05:00:25 GMT neerajbharti 2014-02-25T05:00:25Z How to compute surface of raster or any point using ARCOBJECTS? https://community.esri.com/t5/arcobjects-sdk-questions/how-to-compute-surface-of-raster-or-any-point/m-p/437060#M11828 <HTML><HEAD></HEAD><BODY><SPAN>I have a raster image whose values are a digital elevation model of terrain.</SPAN><BR /><BR /><SPAN>I need to know the surface type (topographic characterization) of particular points along transects of this DEM.</SPAN><BR /><BR /><SPAN>How to find it?</SPAN><BR /><BR /><SPAN>(In my application I have two points: a transmitter end and receiver end. I find the highest point between the transmitter end and receiver end: see the figure below. I would like to know whether the highest point is smooth or is a knife edge; that is, to within the resolution of the image it appears to be non-differentiable.)[ATTACH=CONFIG]31719[/ATTACH]</SPAN></BODY></HTML> Tue, 25 Feb 2014 05:00:25 GMT https://community.esri.com/t5/arcobjects-sdk-questions/how-to-compute-surface-of-raster-or-any-point/m-p/437060#M11828 neerajbharti 2014-02-25T05:00:25Z Re: How to compute surface of raster or any point using ARCOBJECTS? https://community.esri.com/t5/arcobjects-sdk-questions/how-to-compute-surface-of-raster-or-any-point/m-p/437061#M11829 <HTML><HEAD></HEAD><BODY><SPAN>This is an interesting problem but you actually have two questions, it seems to me.</SPAN><BR /><SPAN>1. how to determine if the high point between two point is smooth or sharp(?)&nbsp; Which really depends on how you distinguish either in terms of your wave diffraction equation.&nbsp; Seems like a directional slope change problem, 2nd polynomial or running slope tool twice.</SPAN><BR /><SPAN>2. how to do this in ArcObjects.&nbsp; You really can't tackle this until you'v answered question 1.</SPAN></BODY></HTML> Wed, 26 Feb 2014 18:56:51 GMT https://community.esri.com/t5/arcobjects-sdk-questions/how-to-compute-surface-of-raster-or-any-point/m-p/437061#M11829 AlexanderGray 2014-02-26T18:56:51Z