[NARCCAP-discuss] coordinate systems for NARCCAP model grids

[Antonia Rosati]

Hailey, your script sounds like an excellent addition to the NARCCAP 
toolbox. I'd love if you would share it with the group!

Thank you!

Toni Rosati
NARCCAP User Community Liaison
National Center for Atmospheric Research (NCAR)
narccap at ucar.edu

On Tue, 21 Jun 2011 11:11:45 -0700
  Hailey Eckstrand <haileye at uvic.ca> wrote:
  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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