[NARCCAP-discuss] Projection problem

[Seth McGinnis]

Hi Risa,

It's always helpful to specify what software you're using, and which data
(models, runs, and variables) you're working with.  I'm guessing a little with
these answers, but:

Some CRCM files have projection metadata that's off by half a gridbox.  The
CRCM output should have false_easting=3450000 and false_northing=7450000.  If
it doesn't, change those values and see if it solves the problem.  We're
working on fixing this in the published data, but republishing the corrected
data is time-consuming, and it tends to get back-burnered.  Apologies.

If you're using ArcGIS, the problem with the HRM3 data is that ArcMAP doesn't
understand the Rotated Pole projection.  We've inquired with ESRI about this
issue, but haven't heard any response.

The WRFG-cgcm3 run should have data for 2070.  You may have a truncated
download; try downloading one of the 2066 files again to make sure you got it
all.

Cheers,

--Seth



On Thu, 23 Aug 2012 13:15:22 -0400
 Risa Patarasuk <risajook at ufl.edu> wrote:
>Dear NARCCAP users:
>
>I am just wondering if anyone has any problems projecting some NARCCAP
>models to another. Our research group has aggregate the data into monthly
>and we want to project all of the NARCCAP models to Albers NAD 83. Here are
>the parameters:
>
>PROJCS["NAD_1983_Albers",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],
>
>PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],
>
>PARAMETER["Central_Meridian",-96.0],PARAMETER["Standard_Parallel_1",29.5],PARAMETER["Standard_Parallel_2",45.5],PARAMETER["Latitude_Of_Origin",23.0],UNIT["Meter",1.0]]
>
>The models that we are having the problems with are:
>
>1) CRCM_CCSM model. When I opened it in ArcGIS, the layers don't line with
>with other data sets that we have.
>
>2) HRM3_HADCM3 model. When I converted it to raster, it says the projection
>is 'undefined.' Shouldn't it be Rotated Pole?  I noticed in Panoply Win
>that there are some coordinate information missing compared to other models.
>
>Another question: has anyone worked with WRFG_CGCM3 model? I don't see any
>data in 2070.
>
>Any idea/thoughts would be every much appreciated. Thank you.
>
>Risa
>
>
>-- 
>********************************************
>Risa Patarasuk, Ph.D.
>GIS Specalist, Pinemap Project
>Soil and Water Science Department
>GIS-Pedometrics Lab
>University of Florida
>Gainesville, FL 32611
>********************************************
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