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The image below shows the problem I'm facing. I'm trying to align a DEM with the ArcMap Imagery Basemap. Unfortunately, I can't make them to perfectly align. I tried changing the coordinate system to WGS_1984_Web_Mercator_Auxiliary_Sphere as I understand that is what the Basemap is using but without luck. The DEM originally uses WGS_1984.

Alignment Problem

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    How big is the DEM ? Are you doing a small project or a large project area ? – PROBERT Mar 7 '16 at 17:17
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    Ok if you want you can zoom in to where 100 km are you can export the imagery and then re-project the imagery to match to your DEM projection but I am not sure how will the pixel look like. They might be a bit fuzzy but that is what I would do. I do that a lot for my small project like doing digitize on campground sites. The WGS_1984_Web_Auxiliary_Sphere is what ESRI sets their projection for all of their basemap. – PROBERT Mar 7 '16 at 17:35
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    No, I am talking about the basemap. What I am saying here is to zoom in to the DEM area and turn it off and then you have the imagery in front of you and Export it from the File menu from your ArcMap. Get it ? – PROBERT Mar 7 '16 at 18:08
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    The display coordinates look like UTM--what's the data frame's coordinate system? And approximately where is the data location? – mkennedy Mar 7 '16 at 18:38
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    Is it possible the DEM is aligned correctly but just doesn't appear to be because of the land/water interface you are seeing? (I.E. a value of 0 in the DEM may not accurately represent a shoreline) – YoKev7 Mar 7 '16 at 18:46

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