https://community.esri.com/t5/arcmap-questions/dem-quality/m-p/1171963#M3723 <P><a href="https://community.esri.com/t5/user/viewprofilepage/user-id/581284">@StephanieParadis</a>, were you able to work through the problem with your DEM?</P> Mon, 09 May 2022 14:01:02 GMT ThomasHamill 2022-05-09T14:01:02Z https://community.esri.com/t5/arcmap-questions/dem-quality/m-p/1167410#M3697 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="StephanieParadis_0-1650879349892.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/39729i50BF2A7E25C00466/image-size/medium?v=v2&amp;px=400" role="button" title="StephanieParadis_0-1650879349892.png" alt="StephanieParadis_0-1650879349892.png" /></span></P><P>Hello everyone. I merged several DEMs to make a map for a watershed. However, the quality seem off, showing some weird grid lines when I try to make any transformation. For example here is when I try to convert into slopes (notice the lines?) How can I fix this?</P><P>Thank you,</P><P>Stéphanie</P><P>&nbsp;</P> Mon, 25 Apr 2022 09:37:39 GMT https://community.esri.com/t5/arcmap-questions/dem-quality/m-p/1167410#M3697 StephanieParadis 2022-04-25T09:37:39Z https://community.esri.com/t5/arcmap-questions/dem-quality/m-p/1167511#M3698 <P><a href="https://community.esri.com/t5/user/viewprofilepage/user-id/581284">@StephanieParadis</a>, this usually happens if the <EM><STRONG>Pixel Type</STRONG></EM> (8 Bit unsigned integer, 32 Bit float, etc.) <EM><STRONG>Projection</STRONG></EM>, or <EM><STRONG>File Format with Extension</STRONG></EM> (Erdas Imagine/.img, GeoTiff/.tif, Jpeg/.jpg) changes between the source datasets and the final result during a mosaic.</P><P>&nbsp;</P><P>Have you checked to make sure your resulting mosaic raster has the same properties as the input datasets?<BR /><BR /></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="ThomasHamill_0-1650896963230.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/39765i845EF759D431667B/image-size/medium?v=v2&amp;px=400" role="button" title="ThomasHamill_0-1650896963230.png" alt="ThomasHamill_0-1650896963230.png" /></span></P><P>&nbsp;</P> Mon, 25 Apr 2022 14:29:36 GMT https://community.esri.com/t5/arcmap-questions/dem-quality/m-p/1167511#M3698 ThomasHamill 2022-04-25T14:29:36Z https://community.esri.com/t5/arcmap-questions/dem-quality/m-p/1171963#M3723 <P><a href="https://community.esri.com/t5/user/viewprofilepage/user-id/581284">@StephanieParadis</a>, were you able to work through the problem with your DEM?</P> Mon, 09 May 2022 14:01:02 GMT https://community.esri.com/t5/arcmap-questions/dem-quality/m-p/1171963#M3723 ThomasHamill 2022-05-09T14:01:02Z