Nav library

[derez]

Nav is a library with some algorithms for use in a navigation application.

The names of the main methods are:

• GeoDistanceBearing
• GeoDistance
• UTMDistanceBearing
• FlatArea
• FlatArea2
• SphericalArea
• SphericalArea2
• GeoRouteLength
• GeoRouteLength2
• UTMRouteLength
• UTMRouteLength2

Tha attached file includes Help, example program and the cs file.

Edit: version 1.1 includes the function Atan2 which helps to define azimuth (the same as Atan but for the whole circle).

Edit: version 1.2 includes Map method for getting the x-y coordinates for image map, based on four points data. enables the use of large maps which are not rectangular , or even rotated.

Edit: Version 1.31 includes MagneticData class, provides magnetic declination (variation), Inclination and Grid-Variation for point defined by its coordinates.

[derez]

Updated to ver. 1.1

[Erel]

Thanks. I'm sure that it will be extremely useful.

[Zambody]

Thanks for the lib,

looks vy good. I'm new in this forum and to Basic4ppc. Got my licence a few days ago.
Back to Basic after more than 15 years of teaching C++.

[derez]

The library is updated to ver 1.2, with the addition of Map method. It enables the use of large maps in navigation programs.
The map is calibrated by dual (lat-long + x-y ) coordinates of four points, and returns the x - y of a input lat-long, the local rotation from north, and the horizontal and vertical ratios of the map (map/real).

I'll be glad to further explain if this + the help isn't clear enough.

[derez]

Attached to the first post - a desktop program to help in performing the four-point calibration of a map, for use with Map method.
Operation is simple:
1.prepare the map as a photo
2.run the program
3.load the map
4.go to "map" form and mark the four points, moving by mouse clicks and marking by the buttons there.
5.return to "input" form and fill the lat-long coordinates for the points (Google Earth may help here...)
6.check with another point coordinates to see if it appears in the map form in the center.
7.save a text file for use in the navigation program.

[mjcoon]

I have a suggestion for what I think is an appropriate extension: deriving magnetic variation for any point on Earth. The C code is available free at World Magnetic Model - Software Download.

Mike.

[derez]

It looks as too much work to translate it to the library. sorry.
If anyone would do the translation I'll be glad to include it in Nav.

[mjcoon]

Originally Posted by derez

It looks as too much work to translate it to the library. sorry.

Sorry to hear that. Is the problem that plain "C" (as the NOAA code is) is not compatible with a C# environment (as it is with C++)?

(I was able to build and run the older 2005-era code under Visual C++ 2005 Express Edition.)

Mike.

[derez]

I shall try to work on the fortran version, it is more understandable to me.
It will take time.