Re: identifying coordinates on lambert conformal data

http://mathworld.wolfram.com/LambertConformalConicProjection.html
http://pubs.er.usgs.gov/usgspubs/pp/pp1395

Be careful about your data units. Lat and Lon are in radians. X
and Y are relative to the radius of the sphere, e.g. the earth's
radius. If you are trying to match an existing data set, you will
need the radius that was assumed to create that set.

If you are matching hi-rez satellite data, then I recommend double
precision math.

Dave Allured
CU/CIRES Climate Diagnostics Center (CDC)
http://cires.colorado.edu/science/centers/cdc/
NOAA/ESRL/PSD, Climate Analysis Branch (CAB)
http://www.cdc.noaa.gov/

Micah Sklut wrote:
> Hi NCL,
>
> I have a question that isn't directly related to NCL, but regards to
> dealing with a lambert conformal data set.
> I hope this is a kosher question to ask to the group?
>
> I have a given lat/lon, and I want to find the coordinates on a given
> lambert conformal dataset of the CONUS.
>
> The grid has the following attributes:
>
> xgrid = 1073
> ygrid = 689
>
> lat1: 20.192
> lon1: 238.446
> Dx: 5.079406
> Dy: 5.079406
>
> lat corners (20.192, 20.33182, 50.10547, 49.93959)
> lon corners (-121.554, -69.2084, -60.88594, -130.1034)
>
> So, the conus is defined by some trig equation, and I'm looking for the
> algorithm to determine the coordinates for a given lat/lon.
> If someone could help me out here, I'd be very appreciative.
>
> Thank you.
>
> Micah
>
>
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Received on Thu Jun 05 2008 - 20:03:12 MDT