https://community.esri.com/t5/arcgis-pro-questions/weird-checker-pattern-after-raster-re-projection/m-p/1245741#M64007 <P>I took a LiDAR DEM and re-projected it from VT State Plane Meters to US ft. Then I converted the elevation attributes from meters to feet by multiplying by 3.28....</P><P>When I compare the Meters raster to the US ft raster, there is a weird pattern visible. The first screenshot has a bit of a checker-board pattern. The second (original), looks a lot smoother.<BR /><BR /></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="MemphWatershedAssoc_0-1672943465153.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/59812i07CA6B3523F72BB5/image-size/medium?v=v2&amp;px=400" role="button" title="MemphWatershedAssoc_0-1672943465153.png" alt="MemphWatershedAssoc_0-1672943465153.png" /></span></P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="MemphWatershedAssoc_1-1672943481929.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/59813iB24B3599579187FB/image-size/medium?v=v2&amp;px=400" role="button" title="MemphWatershedAssoc_1-1672943481929.png" alt="MemphWatershedAssoc_1-1672943481929.png" /></span><BR />&nbsp;</P><P>Is this an issue, or more of a graphical thing? The pixel size is the same for both (0.7m from the original DEM), but I'm not sure how that might have changed when I re-projected it. Should I have re-sampled and changed the pixel size?</P><P><BR />lastly, If I'm merging this raster with topo-bathymetry data (TIN to raster), do the pixel sizes need to all be the same? Do I need to set the TIN to raster pixel size at 0.7?</P><P>Thanks!</P><P>&nbsp;</P> Thu, 05 Jan 2023 18:33:48 GMT MemphWatershedAssoc 2023-01-05T18:33:48Z https://community.esri.com/t5/arcgis-pro-questions/weird-checker-pattern-after-raster-re-projection/m-p/1245741#M64007 <P>I took a LiDAR DEM and re-projected it from VT State Plane Meters to US ft. Then I converted the elevation attributes from meters to feet by multiplying by 3.28....</P><P>When I compare the Meters raster to the US ft raster, there is a weird pattern visible. The first screenshot has a bit of a checker-board pattern. The second (original), looks a lot smoother.<BR /><BR /></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="MemphWatershedAssoc_0-1672943465153.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/59812i07CA6B3523F72BB5/image-size/medium?v=v2&amp;px=400" role="button" title="MemphWatershedAssoc_0-1672943465153.png" alt="MemphWatershedAssoc_0-1672943465153.png" /></span></P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="MemphWatershedAssoc_1-1672943481929.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/59813iB24B3599579187FB/image-size/medium?v=v2&amp;px=400" role="button" title="MemphWatershedAssoc_1-1672943481929.png" alt="MemphWatershedAssoc_1-1672943481929.png" /></span><BR />&nbsp;</P><P>Is this an issue, or more of a graphical thing? The pixel size is the same for both (0.7m from the original DEM), but I'm not sure how that might have changed when I re-projected it. Should I have re-sampled and changed the pixel size?</P><P><BR />lastly, If I'm merging this raster with topo-bathymetry data (TIN to raster), do the pixel sizes need to all be the same? Do I need to set the TIN to raster pixel size at 0.7?</P><P>Thanks!</P><P>&nbsp;</P> Thu, 05 Jan 2023 18:33:48 GMT https://community.esri.com/t5/arcgis-pro-questions/weird-checker-pattern-after-raster-re-projection/m-p/1245741#M64007 MemphWatershedAssoc 2023-01-05T18:33:48Z https://community.esri.com/t5/arcgis-pro-questions/weird-checker-pattern-after-raster-re-projection/m-p/1245857#M64031 <P>Did you leave the "<SPAN><A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/project-raster.htm#:~:text=Coordinate%20System-,Resampling%20Technique,-(Optional)" target="_self">Resampling Technique</A>" as the default "Nearest neighbor":</SPAN></P><BLOCKQUOTE><P>The Nearest option, which performs a nearest neighbor assignment, is the fastest of the four interpolation methods. It is primarily used for categorical data, such as a land-use classification, because it will not change the pixel values. <EM>It should not be used for continuous data, such as elevation surfaces.</EM></P><HR /></BLOCKQUOTE><P>Use Bilinear instead.</P> Thu, 05 Jan 2023 21:45:20 GMT https://community.esri.com/t5/arcgis-pro-questions/weird-checker-pattern-after-raster-re-projection/m-p/1245857#M64031 Luke_Pinner 2023-01-05T21:45:20Z