EEA grid 'unknown'

[Anonymous User]

Hi,

I am hoping someone out there will be able to help me with a solution for my problem.

What I have is a grid shp, which I donwloaded from EEA (https://www.eea.europa.eu/data-and-maps/data/eea-reference-grids-2). There are three for Ireland, 1sqkm, 10sqkm and 100sqkm.

I now want to spatial join the 10sqkm grid with my data points (XYTableToPoint).

I have selected the ETRS 1989 LAEA as projection on the map. The data points however only show correctly when I use WGS1984.

I noticed, that when I enter the 100km grid into the map, it defaults to the LAEA projection. But the 10km grid doesn't do that, but seems to be in the correct position on the map. It shows as 'unknown' projection and I have no idea how to change that, as I think that is what is causing the issue when spatial joining.

When I spatial join the 100km with the data points, it works fine. But when I do the same thing with the 10km grid, all data points disappear.

So now I am wondering, if I do something fundamentally wrong (and if so, what) or how I (hopefully) can fix this easily. Any help or suggestions are very much appreciated.

Chris

[DavidPike · Accepted solution]

For some reason they've not attached a .prj file in with the shapefile (this specifies the projection info).

You can either use the 'define projection' tool or get the .prj file and readme guide from the site on the 'additional information' tab.  

[Anonymous User]

That is brilliant, David! And so simple! Thanks so much. I am obviously still pretty new to this whole mapping stuff, but love using ArcGIS and playing around with it for any project I can find. This 'define projection' is a really handy tool!!! Thanks again!