[NARCCAP-discuss] coordinate systems for NARCCAP model grids

Hailey Eckstrand haileye at uvic.ca
Tue Jun 21 12:11:45 MDT 2011


Hi Shuang-Ye,
I use the PROJ.4 - Cartographic Projections Library to define each RCM projection. 

http://trac.osgeo.org/proj/

Here are my projection definitions:

crcm = "+proj=stere +lat_0=90.0 +lat_ts=60.0 +lon_0=263.0 +y_0=7475000.0 +x_0=3475000.0 +a=6371000 +b=6371000 +units=m"
ecp2 = "+proj=stere +lat_0=90.0 +y_0=8400000 +x_0=4700000 +lat_ts=60.0 +lon_0=263.0 +a=6371205 +b=6371205 +units=m"
mm5i = "+proj=lcc +lat_0=47.5 +lat_1=30.0 +lat_2=60.0 +lon_0=-97.0 +y_0=3200000.0 +x_0=3825000.0 +a=6370000 +b=6370000 +units=m"
rcm3 = "+proj=somerc +lat_0=47.5 +y_0=3150000.0 +x_0=3900000.0 +lon_0=-97.0 +a=6371229.0 +b=6371229.0 +units=m"
wrfg = "+proj=lcc +lat_0=47.5 +lat_1=30.0 +y_0=2700000.0 +lat_2=60.0 +x_0=3325000.0 +lon_0=-97 +a=6370000 +b=6370000 +units=m"

I also have the definitions (except hrm3) in ESRI's .prj format if that is helpful.
Please note however that this library isn't very equipped to deal with Hadley's rotated pole projection (hrm3).
I have not found a way to define the rotated pole projection in ESRI & have layers overlay properly.

However, I have found a workaround to transform other layers (shapefiles) into the rotated pole projection within R (for things like spatial subsets).
If anyone is interested, I can send out my script.

Hailey


-----Original Message-----
From: narccap-discuss-bounces at mailman.ucar.edu [mailto:narccap-discuss-bounces at mailman.ucar.edu] On Behalf Of Shuang-Ye Wu
Sent: Tuesday, June 21, 2011 7:19 AM
To: Discussion of NARCCAP data - uses and questions
Subject: [NARCCAP-discuss] coordinate systems for NARCCAP model grids

Hi,

Would you mind providing me with some information on the coordinate systems
used for xc and yc values for each of the NARCCAP model grids?

Thanks a lot.

Shuang-Ye

-- 



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Shuang-Ye Wu, PhD
Assistant Professor
Geology Department
University of Dayton
300 College Park
Dayton, Ohio 45469-2364
Tel: 937-229-1720
Fax: 937-229-2889
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