topic Re: Choosing an algorithm to coarsen raster resolution in Data Management Questions https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33020#M1818 <HTML><HEAD></HEAD><BODY><SPAN>I would read through this thread: </SPAN><A href="http://forums.arcgis.com/threads/20607-Need-help-with-slope-algorithms-for-my-internship?p=68499#post68499">http://forums.arcgis.com/threads/20607-Need-help-with-slope-algorithms-for-my-internship?p=68499#post68499</A><BR /><BR /><SPAN>oh....you did....sorry...I thought some of the links in that discussion might lead somewhere</SPAN></BODY></HTML> Fri, 28 Jan 2011 03:09:08 GMT MichaelStead 2011-01-28T03:09:08Z Choosing an algorithm to coarsen raster resolution https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33017#M1815 <HTML><HEAD></HEAD><BODY><SPAN>I currently have a DEM from 1 meter LIDAR elevation data, and I have been tasked with figuring out which is the best algorithm to coarsen the resolution to 3 meter and 5 meter DEMs. I need to provide citation as&nbsp; because I need to write a report about this as well. Someone mentioned generating a roughness index and using that to make a determination? Anyone have any ideas?</SPAN></BODY></HTML> Thu, 27 Jan 2011 18:09:00 GMT https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33017#M1815 MattGray 2011-01-27T18:09:00Z Re: Choosing an algorithm to coarsen raster resolution https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33018#M1816 <HTML><HEAD></HEAD><BODY><SPAN>Can't help you with citation, but my starting point would be the resample tool with resampling technique set to bilinear och cubic convolution.</SPAN></BODY></HTML> Thu, 27 Jan 2011 19:26:43 GMT https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33018#M1816 NiklasNorrthon 2011-01-27T19:26:43Z Re: Choosing an algorithm to coarsen raster resolution https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33019#M1817 <HTML><HEAD></HEAD><BODY><SPAN>Although I could not find anything about a "roughness index", I did read up more on nearest neighbor, bilinear interpolation, and cubic convolution. Many sources have said use bilinear or cubic or continuous data, such as elevation surfaces. I only question now is, which of the two is the best for elevation data? I need documentation as well. Anybody?</SPAN></BODY></HTML> Fri, 28 Jan 2011 01:33:12 GMT https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33019#M1817 MattGray 2011-01-28T01:33:12Z Re: Choosing an algorithm to coarsen raster resolution https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33020#M1818 <HTML><HEAD></HEAD><BODY><SPAN>I would read through this thread: </SPAN><A href="http://forums.arcgis.com/threads/20607-Need-help-with-slope-algorithms-for-my-internship?p=68499#post68499">http://forums.arcgis.com/threads/20607-Need-help-with-slope-algorithms-for-my-internship?p=68499#post68499</A><BR /><BR /><SPAN>oh....you did....sorry...I thought some of the links in that discussion might lead somewhere</SPAN></BODY></HTML> Fri, 28 Jan 2011 03:09:08 GMT https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33020#M1818 MichaelStead 2011-01-28T03:09:08Z Re: Choosing an algorithm to coarsen raster resolution https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33021#M1819 <HTML><HEAD></HEAD><BODY><SPAN>From what&nbsp; I read on ESRI desktop help, I decided that bilinear interpolation is the best for resampling elevation data. Does anyone have a link to a good paper about resampling DEMs that I could cite?</SPAN></BODY></HTML> Thu, 03 Feb 2011 21:37:59 GMT https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33021#M1819 MattGray 2011-02-03T21:37:59Z Re: Choosing an algorithm to coarsen raster resolution https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33022#M1820 <HTML><HEAD></HEAD><BODY><SPAN>I would like to this as well, but I am using a population grid and would like my output to be a sum, any suggestions? Thanks.</SPAN></BODY></HTML> Thu, 19 May 2011 19:19:33 GMT https://community.esri.com/t5/data-management-questions/choosing-an-algorithm-to-coarsen-raster-resolution/m-p/33022#M1820 RoyBurstein 2011-05-19T19:19:33Z