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Coordinate Transformer by Gridded Correction Parameter (par file)

Project description

jgdtrans for Python

Unofficial coordinate transformer by Gridded Correction Parameter which Geospatial Information Authority of Japan (GIAJ, formerly GSIJ) distributing for Python.

国土地理院が公開しているパラメータファイル(par ファイル)による座標変換(順逆変換)の非公式な実装です。

Features:

  • Supports offline transformation (no web API)
    • オフライン変換(web API 不使用)
  • Supports both original forward and backward transformation
    • 順変換と逆変換の両方をサポート
  • Supports verified backward transformation
    • 精度を保証した逆変換のサポート
  • Supports all TKY2JGD, PatchJGD, PatchJGD(H), HyokoRev, SemiDynaEXE and POS2JGD (geonetF3 and ITRF2014)
  • Clean implementation
    • 保守が容易な実装

Usage

You can install jgdtrans from PyPI:

pip install jgdtrans

jgdtrans depends on typing-extensions only, and requires Python >=3.9.

This package does not contain parameter files, download it from GIAJ.

このパッケージはパラメータファイルを提供しません。公式サイトよりダウンロードしてください。

Sample code:

import jgdtrans

with open('SemiDyna2023.par') as fp:
    tf = jgdtrans.load(fp, format='SemiDynaEXE')

# Geospatial Information Authority of Japan
origin = (36.10377479, 140.087855041, 2.34)

# forward transformation
result = tf.forward(*origin)
# prints Point(latitude=36.103773017086695, longitude=140.08785924333452, altitude=2.4363138578103)
print(result)

# backward transformation
point = tf.backward(*result)
# prints Point(latitude=36.10377479, longitude=140.087855041, altitude=2.34)
print(point)

# backward transformation compatible to GIAJ web app/APIs
p = tf.backward_compat(*result)
# prints Point(latitude=36.10377479000002, longitude=140.087855041, altitude=2.339999999578243)
print(p)

Licence

MIT

Reference

  1. Geospatial Information Authority of Japan (GIAJ, 国土地理院): https://www.gsi.go.jp/, (English) https://www.gsi.go.jp/ENGLISH/.
  2. TKY2JGD for Windows Ver.1.3.79 (reference implementation): https://www.gsi.go.jp/sokuchikijun/tky2jgd_download.html released under 国土地理院コンテンツ利用規約 which compatible to CC BY 4.0.
  3. Other implementation: Rust https://github.com/paqira/jgdtrans-rs, Java https://github.com/paqira/jgdtrans-java, JavaScript/TypeScript https://github.com/paqira/jgdtrans-js.

Project details


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