SilverStripe NZ Transverse Mercator Projection Conversion

This module is designed to convert New Zealand Transverse Mercator (NZTM) projections to latitude longitude on the New Zealand Geodetic Datum 2000.

Northings and eastings are in metres. Latitudes and longitudes are in radians.

NOTE: that Chatham Islands conversion does not return correct result.

Installation (composer required)

$ composer require "heyday/silverstripe-nztm-location-convertor:~1.0"

Usage

A conversion return a CoOrdinates object and can be done in the following way:

// Ycoord
$northing = 4858564;

// Xcoord
$easting = 1237476;

// The following returns an object using the default constants
$tm = TMProjection::CreateDefaultTMProjection();
$coOrdinates = TMProjection::tm_eod($tm, $easting, $northing);

// Latitude
print $coOrdinates->getFormattedLatitude();

// Longitude
print $coOrdinates->getFormattedLongitude();

Commandline utility

Included is also a sample commandline utility that can be run that prompts for easting and northing and will convert. This can be run as follows:

$ ./bin/nztm-converter

Running Tests

Tests can be run:

$ ./vendor/bin/phpunit tests/TMProjectionTest.php