topic Re: Curvature raster map problem in 3D Questions https://community.esri.com/t5/3d-questions/curvature-raster-map-problem/m-p/736810#M4439 <HTML><HEAD></HEAD><BODY><SPAN>The problem is still unsolved.</SPAN><BR /><SPAN>I think it's not a fail DEM problem.</SPAN><BR /><BR /><SPAN>Fig. 1. DEM</SPAN><BR /><SPAN>[ATTACH=CONFIG]23440[/ATTACH]</SPAN><BR /><BR /><SPAN>Fig. 2. Total curvature grid layer</SPAN><BR /><SPAN>[ATTACH=CONFIG]23441[/ATTACH]</SPAN><BR /><BR /><SPAN>Fig. 3. Topographic Wetness Index (TWI) / Compound Topographic Index (CTI) / Catchment Wetness Index (CWI)&nbsp; (DEM derivative) - the same problem with pixels with extreme values which looking like chess board.</SPAN><BR /><BR /><SPAN>[ATTACH=CONFIG]23442[/ATTACH]</SPAN><BR /><BR /><SPAN>maybe there is an intelligent way to smooth the grids? any ideas?</SPAN></BODY></HTML> Fri, 12 Apr 2013 12:09:25 GMT TomaszBartus 2013-04-12T12:09:25Z Curvature raster map problem https://community.esri.com/t5/3d-questions/curvature-raster-map-problem/m-p/736809#M4438 <HTML><HEAD></HEAD><BODY><SPAN>Hi!</SPAN><BR /><BR /><SPAN>I have posted the question about my curvature tool problem to raster subforum (</SPAN><A href="http://forums.arcgis.com/threads/79818-Curvature-raster-map">http://forums.arcgis.com/threads/79818-Curvature-raster-map</A><SPAN>).</SPAN><BR /><BR /><SPAN>I do not want to multiply messages and therefore, please to use the external link</SPAN><BR /><BR /><SPAN>Tomasz Bartu�?</SPAN></BODY></HTML> Thu, 14 Mar 2013 09:42:31 GMT https://community.esri.com/t5/3d-questions/curvature-raster-map-problem/m-p/736809#M4438 TomaszBartus 2013-03-14T09:42:31Z Re: Curvature raster map problem https://community.esri.com/t5/3d-questions/curvature-raster-map-problem/m-p/736810#M4439 <HTML><HEAD></HEAD><BODY><SPAN>The problem is still unsolved.</SPAN><BR /><SPAN>I think it's not a fail DEM problem.</SPAN><BR /><BR /><SPAN>Fig. 1. DEM</SPAN><BR /><SPAN>[ATTACH=CONFIG]23440[/ATTACH]</SPAN><BR /><BR /><SPAN>Fig. 2. Total curvature grid layer</SPAN><BR /><SPAN>[ATTACH=CONFIG]23441[/ATTACH]</SPAN><BR /><BR /><SPAN>Fig. 3. Topographic Wetness Index (TWI) / Compound Topographic Index (CTI) / Catchment Wetness Index (CWI)&nbsp; (DEM derivative) - the same problem with pixels with extreme values which looking like chess board.</SPAN><BR /><BR /><SPAN>[ATTACH=CONFIG]23442[/ATTACH]</SPAN><BR /><BR /><SPAN>maybe there is an intelligent way to smooth the grids? any ideas?</SPAN></BODY></HTML> Fri, 12 Apr 2013 12:09:25 GMT https://community.esri.com/t5/3d-questions/curvature-raster-map-problem/m-p/736810#M4439 TomaszBartus 2013-04-12T12:09:25Z Fourier Noise Removal https://community.esri.com/t5/3d-questions/curvature-raster-map-problem/m-p/736811#M4440 <HTML><HEAD></HEAD><BODY><SPAN>How to perform a smoothing of the grid surface by the Fast Fourier Transform (FFT) (Preferably using free applications)?</SPAN><BR /><SPAN>I know that this can not be done directly in ArcGIS.</SPAN><BR /><BR /><SPAN>- It'll be probably possible to do with Oasis Montaj (I do not have the app) and Surfer (</SPAN><A href="http://www.cas.umt.edu/geosciences//faculty/sheriff/495-applied%20magnetics/sources/threshold%20filters%20with%20surfer.pdf">http://www.cas.umt.edu/geosciences//faculty/sheriff/495-applied%20magnetics/sources/threshold%20filters%20with%20surfer.pdf</A><SPAN>),</SPAN><BR /><SPAN>- Idrisi?</SPAN></BODY></HTML> Mon, 15 Apr 2013 10:35:07 GMT https://community.esri.com/t5/3d-questions/curvature-raster-map-problem/m-p/736811#M4440 TomaszBartus 2013-04-15T10:35:07Z Re: Curvature raster map problem https://community.esri.com/t5/3d-questions/curvature-raster-map-problem/m-p/736812#M4441 <HTML><HEAD></HEAD><BODY><SPAN>It may be useful to someone!</SPAN><BR /><SPAN>The problem was caused by the irregular boundaries of the DEM area. When I change it to the rectangular, the problem has resolved.</SPAN></BODY></HTML> Wed, 05 Jun 2013 06:04:06 GMT https://community.esri.com/t5/3d-questions/curvature-raster-map-problem/m-p/736812#M4441 TomaszBartus 2013-06-05T06:04:06Z