Re: KURVP1DP, KURVP2DP, ezmaps and the North Pole

From: john.prinos AT aero.bombardier.com
Date: Wed Dec 22 2004 - 07:01:25 MST

  • Next message: Farooqui, Zuber: "ncargpath"

    Hello again all,

    It appears my problem was that I was doing my interpolations with KURVP1DP,
    KURVP2DP in a lat/long coordinate system as opposed to a cartesian one.

    The immediate solution was to transform my initial lat/long coordinates to
    cartesian through the MAPTRN subroutine and then do all of the remaining
    interpolations afterwards.

    The bizarre behavior at the poles has disappeared.

    Lots of thanks to Dave Kennison for the extensive help he gave. It says
    alot for the product!

    John

    John Prinos
    Analyst, Airline Industry Analysis and Strategy
    Marketing, Bombardier Regional Aircraft
    jprinos@dehavilland.ca
    (416) 373-5590

    ----------------------------------------------------------------------

    Message: 1
    Date: Mon, 20 Dec 2004 14:13:05 -0500
    From: john.prinos@aero.bombardier.com
    Subject: KURVP1DP, KURVP2DP, ezmaps and the North Pole
    To: ncarg-talk@ucar.edu
    Message-ID: <OF8A3B511D.56E007F3-ON85256F70.0068C83C@dehavilland.ca>
    Content-Type: text/plain; charset="us-ascii"

    Hello all,

    Great to hear about the new NCARG version, can't wait to try it out.

    but first....

    I'm drawing closed curves pumped out of KURVP1DP, KURVP2DP onto orthogonal
    projection maps drawn by EZMAP.

    Everything works great generally until the curves get close to the North
    Pole (haven't tested the South Pole yet).
    The curves bend out of the way of the pole. If the closed curve is supposed
    to encompass the pole, it actually draws in such a way as to disclude the
    North Pole. It is quite comical looking. I wish I could upload the images
    because my description really isn't doing it justice.

    I've played around with the SIGMA variables to no avail. Has anyone else
    encountered this? More importantly, has anyone found a fix?

    Thanks in advance, Happy Holidaze

    John Prinos
    jprinos@dehavilland.ca
    (416) 373-5590


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