some of my data gets re-align every time i re-add it in within the QGIS Table of contents ( like a good 5-10 feet off). I have no idea what could be the cause, I may have the given layer in a different projection compared to the basemap but i don't think that is the case. suggestions?

  • What basemap are you using? – DPSSpatial Dec 4 '17 at 20:52
  • ... and what CRS is the data layer in? – AndreJ Dec 5 '17 at 6:25

If you know the CRS of your vector layer then add that to a new map document. Next, open the layer properties and define the CRS, if necessary. After that, make sure that on-the-fly projection is enabled in the document properties, then add your basemap. All should line up if your basemap's projection is known and/or if you are using a served raster.

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  • its strange. so i'm working with the zoning vector layer(the one that wasn't matching up), but it has a different projection than my basemap and the other vector layers. When i make the same CRS as the other basemap layers for the zone layer, it doesn't show up or its way out in the middle of nowhere. I do have on-the-fly projection enabled in both cases. – Greg Jones Dec 5 '17 at 15:03
  • Given what you describe in your comment, my guess is the CRS was defined incorrectly at the start; thus, any subsequent reprojection will be incorrect. Have you reached out to the data provider/creator to make sure you know the CRS? And have you tried loading all your vector layers without the basemap - if so, do they all line up then? An additional note, if you're doing any analyses among your various vector layers, a best practice is to have them all in the same CRS. [gis.stackexchange.com/questions/232567/… – pdavis Dec 5 '17 at 18:49

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