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I have two shapefiles and two rasters (dem), and while I put them in the same coordinate system (Greek grid), it seems that they don't overlap. But one is the boundaries of a county, and another the polygon layer with the drought statistics of the same area.. So they should overlap but don't.

marked as duplicate by Aaron Jan 10 '16 at 18:02

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    "Same coordinate system" is the boner here. I don't think it's true. – mdsumner Jan 10 '16 at 13:56
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    "while I put them in the same coordinate system" . You cannot do "put" data from differing datasets into the same coordinate system. You need to reproject (not project) them. Most likely this, gis.stackexchange.com/questions/20572/… – If you do not know- just GIS Jan 10 '16 at 14:59
  • At first i didn't understand what you wrote.. But now i see.. You mean that in this case, we're having two shp files and two rasters. You're saying that we can't have the same coordinate system in different datasets. But what can i do? i mean, the rasters and everything are about the same thing. So they need to be overlapped.. Can you help me if i send you the data? – Jenny Kem Jan 10 '16 at 15:29
  • This is not what I mean but this is your final exam so you should work it out. – If you do not know- just GIS Jan 10 '16 at 16:09
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Using QGIS, You have to use Save as ... for vector data and Raster -> Projections -> Warp (Reproject) for raster data to reproject the data to the same CRS, under a new filename for each dataset. Arcgis and other GIS software might be similar.

Set Layer CRS is not the same, and will corrupt your data. You better start with a fresh copy of the original data.

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