topic Strange triangles occur when rectifying raster in Data Management Questions https://community.esri.com/t5/data-management-questions/strange-triangles-occur-when-rectifying-raster/m-p/60524#M3441 <HTML><HEAD></HEAD><BODY><SPAN>Hi all,</SPAN><BR /><BR /><SPAN>I came across this problem some time ago, but decided I need a solution now as I am rectifying some raster files to extract and quantify some values.</SPAN><BR /><BR /><SPAN>As I was rectifying the raster (created from some png / jpg files, and converted to grid / img / tif in ArcMap), I noticed that some strange triangles started appearing in the raster. This tends to happen when there are bigger RMS error in the rectification process, but I can't help wondering if these artefacts will end up in the rectified image - thereby affecting the subsequent data extraction and quantification process.</SPAN><BR /><BR /><SPAN>Appreciate any advice on this. </SPAN><BR /><BR /><SPAN>Happy New Year in advance! <span class="lia-unicode-emoji" title=":slightly_smiling_face:">🙂</span></SPAN><BR /><BR /><SPAN>[ATTACH=CONFIG]20337[/ATTACH]</SPAN></BODY></HTML> Mon, 31 Dec 2012 02:16:47 GMT CuifenPui 2012-12-31T02:16:47Z Strange triangles occur when rectifying raster https://community.esri.com/t5/data-management-questions/strange-triangles-occur-when-rectifying-raster/m-p/60524#M3441 <HTML><HEAD></HEAD><BODY><SPAN>Hi all,</SPAN><BR /><BR /><SPAN>I came across this problem some time ago, but decided I need a solution now as I am rectifying some raster files to extract and quantify some values.</SPAN><BR /><BR /><SPAN>As I was rectifying the raster (created from some png / jpg files, and converted to grid / img / tif in ArcMap), I noticed that some strange triangles started appearing in the raster. This tends to happen when there are bigger RMS error in the rectification process, but I can't help wondering if these artefacts will end up in the rectified image - thereby affecting the subsequent data extraction and quantification process.</SPAN><BR /><BR /><SPAN>Appreciate any advice on this. </SPAN><BR /><BR /><SPAN>Happy New Year in advance! <span class="lia-unicode-emoji" title=":slightly_smiling_face:">🙂</span></SPAN><BR /><BR /><SPAN>[ATTACH=CONFIG]20337[/ATTACH]</SPAN></BODY></HTML> Mon, 31 Dec 2012 02:16:47 GMT https://community.esri.com/t5/data-management-questions/strange-triangles-occur-when-rectifying-raster/m-p/60524#M3441 CuifenPui 2012-12-31T02:16:47Z