Results 1 to 6 of 6

Thread: Programmer wanted...

  1. #1

    Post Programmer wanted...

    I wanted a utility the other day, and couldn't find it...

    I'd like to be able to load a rectangular map (equirectangular, or not) image, and specify the latitude and longitude of the four edges (in the case of a full world equirectangular mapping, that would be +90, -90 (north to south) and +180, -180 (east to west)) and the planet radius/diameter in "units".

    Now let the user pick zoom in/out and pick any two points, to calculate and display the great circle distance

    If I had a programming environment more recent than VB3.0, I'd try putting this together my self 'cause I don't think it is too complicated.

    -Rob A>

  2. #2
    Community Leader jfrazierjr's Avatar
    Join Date
    Oct 2007
    Location
    Apex, NC USA
    Posts
    3,057

    Post

    Rob, you can actually download a lite version of VisualStudio if your interested and no one else beats you to it first.

    Joe
    My Finished Maps
    Works in Progress(or abandoned tests)
    My Tutorials:
    Explanation of Layer Masks in GIMP
    How to create ISO Mountains in GIMP/PS using the Smudge tool
    ----------------------------------------------------------
    Unless otherwise stated by me in the post, all work is licensed under a Creative Commons Attribution-Noncommercial 3.0 United States License.

  3. #3
    Administrator waldronate's Avatar
    Join Date
    Mar 2007
    Location
    The High Desert
    Posts
    3,549

    Default

    FT will do what you're asking, I think.

    1) Load the map as an image overlay (equirectangular only, but ReprojectImage at http://www.ridgenet.net/~jslayton/ReprojectImage.zip will convert the projections)
    2) Zoom and pan to get the desired area(s).
    3) Use the ruler tool to measure distances (it does great circle distances).

    If you don't have a retail copy of FT then you can download the demo from ProFantasy. It won't export things at high resolution or save things past the initial demo period but it will still measure things even after it's expired.

  4. #4
    Administrator waldronate's Avatar
    Join Date
    Mar 2007
    Location
    The High Desert
    Posts
    3,549

    Default

    As an aside, I like the Aviation Formulary for general great-circle computations. http://williams.best.vwh.net/avform.htm gives the forumulae that you'll want ot know for general navigation on a spherical earth. It's quite similar to navigation on an ellipsoidal earth, but the 1 part in 300 deviation isn't usually that important unless you're trying to enter a harbor or not fly into a mountain or suchlike.

  5. #5
    Guild Artisan su_liam's Avatar
    Join Date
    Aug 2007
    Location
    Port Alberta, Regina(IRL: Eugene, OR)
    Posts
    798

    Default

    If java works for you, I should be able to put something like that together for you. Hopefully the deadline isn't too short...

  6. #6

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •