Dear NCL users,
We are very pleased to announce two new major features in NCL with
regard to maps:
1. You can have lat/lon labels automatically generated for
several map projections. This feature has not been incorporated
into the gsn_csm* functions yet.
To generate map tickmarks automatically (if you are not using
gsn_csm functions), set the "pmTickMarkDisplayMode" resource to
"Always" when you are setting the map resources. (See example at
the end of this message.)
For more information, see the resource documentation at:
http://ngwww.ucar.edu/ngdoc/ng/ref/hlu/obj/MapPlot.obj.html#TickMarks
2. You can access the multi-resolution coastline database RANGS
(Regionally Accessible Nested Global Shorelines), developed by
Rainer Feistel from Wessel and Smith's GSHHS (Global
Self-consistent Hierarchical High-resolution Shoreline)
database.
To access the RANGS/GSHHS database, you must first download it
from Rainer Feistel's web site at:
http://www.io-warnemuende.de/homepages/rfeistel/index.html
Right before the section entitled "Some WWW Links", you should
see a little table with ten *.zip files to download:
rangs(0).zip gshhs(0).zip
rangs(1).zip gshhs(1).zip
rangs(2).zip gshhs(2).zip
rangs(3).zip gshhs(3).zip
rangs(4).zip gshhs(4).zip
You must download all ten of these files, unzip them, and
either put them in the default directory
"$NCARG_ROOT/lib/ncarg/database/rangs", or put them somewhere
else and set the environment variable NCARG_RANGS to this
directory. The files take up about 140 megabytes, unzipped.
Once you have the files in the appropriate location, then set
the "mpDataBaseVersion" resource to "RANGS_GSHHS" to create maps
using this database. (See example at the end of this message.)
Note: you should not use this database to plot maximal area plots,
because 1) you will get horizontal lines through your plot, and 2) it
takes a long time. If this is going to be a problem for you, send
me email at haley@ucar.edu.
For more information, see the resource documentation at:
http://ngwww.ucar.edu/ngdoc/ng/ref/hlu/obj/MapPlot.res.html#mpDataBaseVersion
Note: the example below uses the generic "gsn_map" function to plot up
a cylindrical equidistant plot with automatic map labels. The first
plot uses the default resolution, and the second one uses the
RANGS/GSHHS database. Note that if you don't have this database
installed, you will get an error message. Also, the second plot will
take longer to plot.
You must have at least version 4.2.0.a022 of NCL to run this example!
Cheers,
--Mary
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
begin
;
; Create an XWorkstation object.
;
wks = gsn_open_wks("x11","plot")
;
; Set up some map resources.
;
mpres = True
mpres@gsnMaximize = True
mpres@mpLimitMode = "LatLon"
mpres@mpMinLonF = -15.
mpres@mpMaxLonF = 15
mpres@mpMinLatF = 40.
mpres@mpMaxLatF = 70.
mpres@pmTickMarkDisplayMode = "Always"
;
; Draw a cylindrical equidistant map, with the above resources set.
;
map = gsn_map(wks,"CylindricalEquidistant",mpres)
;
; Draw a cylindrical equidistant map using the RANGS/GSHHS database.
;
mpres@mpDataBaseVersion = "RANGS_GSHHS"
map = gsn_map(wks,"CylindricalEquidistant",mpres)
end
This archive was generated by hypermail 2b29 : Tue Feb 19 2002 - 08:48:13 MST