Leveraging D3 for converting NZTM2000 coordinates to WGS84

I've been having some difficulties converting NZTM2000, a variant of the Transverse Mercator projection used in New Zealand (), to WSG84 latitude/longitude coordinates.

The specifications for NZTM2000 state that the TM is set up with the following parameters:

  • Origin latitude: ° 00' 00" South
  • Origin longitude / central meridian:173° 00' 00" East
  • False Northing:10,000,000 meters North
  • False Easting:1,600,000 meters East
  • Central meridian scale factor:0.9996

I attempted to apply them in S3:

var projection = d3.geo.transverseMercator()
    .rotate([origin_lat, origin_lng])
    .scale(scale_factor)
    .center([false_northing, false_easting])

(as well as other methods).

I was working with a small dataset containing known WGS84 values:

NZTM2000                WSG84
---------------------   -------------------------------
Northing     Easting     Latitude        Longitude
5771280.5   1900560.5   38 09 22.691 S  176 25 48.538 E
5771280.5   1900570.5   38 09 22.679 S  176 25 48.948 E
5771280.5   1900571.5   38 09 22.678 S  176 25 48.989 E
5771280.5   1900572.5   38 09 22.677 S  176 25 49.030 E

Any assistance would be greatly appreciated.

Many thanks

javascriptmap-projections

Answer №1

I recently discovered a helpful solution on the LINZ site. They have already developed the algorithm in C, which can be found at .

Furthermore, someone has converted it to C# and shared it on GitHub at https://github.com/leighghunt/nztm/blob/master/nztm/nztm.cs.

I took this latest version and successfully ported it to JavaScript.

If you're interested, feel free to reach out to me for my version.

========= Would you mind sharing the JavaScript version on GitHub? I could really use it.

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