For users who would like additional GNN attributes or years
(currently 1986-2017), we will consider requests to expanded
access on a case-by-case basis.
To process additional data requests, we require knowledge of the
use being proposed so that we can both determine what data
are needed and the appropriateness of proposed analyses.
Please be explicit, especially with respect to the mapped
variables and years of data.
Once we have reviewed and accepted your request, we will
give you authenticated access to these additional rasters
through this same download site. Please allow one week
for us to review your request.