Geo::Coordinates::Converter::LV03 - Convert Swiss LV03 coordinates to WSG84 and vice versa
VERSION
Version 0.03
SYNOPSIS
use Geo::Coordinates::Converter::LV03;
my ($x, $y) = Geo::Coordinates::Converter::LV03::lat_lng_2_y_x($φ, $λ);
my ($φ, $λ) = Geo::Coordinates::Converter::LV03::y_x_2_lat_lng($x, $y);EXPORT
On request, lat_lng_2_y_x and y_x_2_lat_lng are exported:
use Geo::Coordinates::Converter::LV03 qw(lat_lng_2_y_x y_x_2_lat_lng);
my ($x, $y) = lat_lng_2_y_x($φ, $λ);
my ($φ, $λ) = y_x_2_lat_lng($x, $y);SUBROUTINES/METHODS
lat_lng_2_y_x($lat, $lng)
Convert a latitude/longitude tuple to a Swiss LV03 datum.
Note: the Swiss seem to name the east-west axis by Y and the the north-south axis by X. Hence the strangly order of y and x in the sub's name.
y_x_2_lat_lng($y, $x)
Convert a Swiss LV03 datum to a latitude and longitude tuple.
Note: the Swiss seem to name the east-west axis by Y and the the north-south axis by X. Hence, the first argument is named y, the second x.
WARNING
The document from which I derived the formulas (see LINKS) contains this friendly warning; »Diese Formeln haben eine reduzierte Genauigkeit und sind vor allem für Navigationszwecke vorgesehen. Sie dürfen nicht für die amtliche Vermessung oder für geodätische Anwendungen verwendet werden!« (that is: only to be used for navigational purposes, not of exact (or even official) measurements or geodatic applications).
WHY
Why was I not using the already existing Geo::Coordinates::Converter?
I tried, but that module's code seemed too hard and esoteric to extend. So I made this module a seperate one.
AUTHOR
René Nyffenegger, <rene.nyffenegger at adp-gmbh.ch>
SEE ALSO
https://asciich.ch/wordpress/koordinatenumrechner-schweiz-international/: A converter in javascript.
Fabien Fivaz's wgs84_to_lv03.pl. Apparently, his script uses the online service at http://geodesy.geo.admin.ch/reframe/ to convert the coordinates.
BUGS AND CAVEATS
The common order of using lattitude and longitude is first: lattitude, the longitude. lattitude goes in y-direction, longitude in x-direction. So, they're in a different order than the usually known X then y. More gravely is the fact, that the x in "lat_lng_2_y_x" and in "y_x_2_lat_lng" is what usually is the y, and vice versa. I should and might change that once. Then again, I might not find the time.
Please report any bugs or feature requests to bug-geo-coordinates-converter-lv03 at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Geo-Coordinates-Converter-LV03. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
SOURCE CODE
The source code is in a github repository. Meaningful pull requests are welcome.
LICENSE AND COPYRIGHT
Copyright 2017 René Nyffenegger.
This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:
http://www.perlfoundation.org/artistic_license_2_0
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