Full US Mosaic reference for RIDGE:
http://atlas.resources.ca.gov/ArcGIS/rest/services/Atmosphere_Climate/RIDGE_Precip_Radar/MapServer
Interesting that it's a California reference, and not an NWS reference!
Ah. Note the bottom of the page, where you can select your data and it
talks about the worldfiles.
http://www.srh.noaa.gov/jetstream/doppler/gis.htm
gerry
James Jolin wrote:
Alex Carver wrote:
--- On Sun, 12/6/09, James Jolin <jjo...@itol.com> wrote:
Alex,
How did you set up the geo file? Did you take an
existing file and change the url or did you start from
scratch? I know next to nothing about geo files.
Jim
WA9ARB
The easiest way is to follow along with one of the default GEO files
and make the appropriate modifications.
Here's an example of my GEO for the Atlanta area RIDGE radar (watch
out for word wraps):
# X Y
Long Lat
URL http://www.srh.noaa.gov/ridge/RadarImg/N0R/FFC_N0R_0.gif
TIEPOINT 0 0
-87.37500 35.58083
TIEPOINT 620 620
-82.00217 31.14133
IMAGESIZE 620 620
REFRESH 60
TRANSPARENT 0x0
PROJECTION LatLon
The TIEPOINT directives will assign a specific pixel coordinate (X,Y)
to a specific lat/long. Pixel 0,0 is upper left, and 620x620 is the
lower right most pixel on my RIDGE image (the image itself is also
620x620 in this case). You need two TIEPOINTs so that Xastir can
appropriately place the image. The IMAGESIZE tells Xastir how big the
radar file is in pixels (again 620x620 for the Atlanta RIDGE).
After that, just fix the URL accordingly.
The more accurate the points, the better the radar will line up with
your maps. I used Delorme Street Atlas to find a couple known points
in the RIDGE data and then worked my way back to the corners. You
don't have to use the corners of the image file, any two points will
do since Xastir knows about the overall image size using the IMAGESIZE
directive.
You may have to play around with the TRANSPARENT directive which tells
Xastir what color is defined to be transparent for overlay purposes.
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thanks, Alex...looks like a nice evening project.
Jim
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