Geocaching Travel Planner

[+911turbos]

Hi All,

 

This is my first post.

 

I'm currently programming a "Geocaching Travel Planner" windows app (written in c++). It's kind of a mix between GSAK, N-Route and maps.google.com. It currently supports loading in GPX files and running filters on them, and viewing the waypoints on a google map ( it also tracks your position if you have a Garmin GPS18 connected). I'm just adding support for OZI explorer maps as well. I have them loading and displaying but not displaying the caches in the right positions. I need the math for converting a pixel coord into a lat/lon ( and vice versa ) using the 4 arbitrary pixel points on the map and their 4 lat/lons. Can anyone help me with the math?

 

MMPXY,1,99,117

MMPXY,2,1066,116

MMPXY,3,1067,1045

MMPXY,4,95,1044

 

MMPLL,1,-173.695056, 66.379964

MMPLL,2, -5.492876, 66.519704

MMPLL,3, -62.044177, 33.988929

MMPLL,4,-117.511879, 33.912850

 

Plans for the future are to load MapSource and CitySelect maps as well and do street routing between waypoints. I've found some docs for their secret format but any additional info would be greatly appreciated.

 

Thanks

Kevin Pickell

911Turbos

[+Red90]

I have emailed you, but to help bump your topic. First you need to know the projection method used to make the map. For the sake of going somewhere, I would assume "Universal Transverse Mercator".

 

Equations for converting for X, Y to Lon/Lat and back are at this link.

[+Red90]

UTM to Lat/Lon source code in C here: http://www.gpsy.com/gpsinfo/geotoutm/

[+Old Sailor]