Question

我有一个geojson文件，表明蒙特利尔的一些兴趣点，但坐标不是lat和lng，而是MTM nad83，区域8中的X，Y坐标。

我想在谷歌地图中加载文件，但需要转换坐标..

我在互联网上搜索了很多，但我发现的所有内容都是能够转换它的网站：twcc.fr。在js源代码中，我没有找到任何东西，所以它可能是服务器端。

知道坐标转换的任何人？

提前感谢

**编辑：**来自json文件的样本：

{"name":"json_sortie","type":"FeatureCollection"
,"features":[
{"type":"Feature","geometry":{"type":"Point","coordinates":[294079.844,5044618.5]},"properties":{"POTEAU_ID_POT":122476,"DATE_CONCEPTION_POT":20101216000000,"DESCRIPTION_REP":"Enlevé","DESCRIPTION_RTP":"2- Tige et manchon","X":294079.844,"Y":5044618.5,"ID_ARRONDISSEMENT":"25","TRC_ID":1110499}}
,{"type":"Feature","geometry":{"type":"Point","coordinates":[296910.375,5045914.5]},"properties":{"POTEAU_ID_POT":5766,"DATE_CONCEPTION_POT":20090707000000,"DESCRIPTION_REP":"Réel","DESCRIPTION_RTP":"3- Fût","X":296910.375,"Y":5045914.5,"ID_ARRONDISSEMENT":"25","TRC_ID":1090130}}
,{"type":"Feature","geometry":{"type":"Point","coordinates":[296908.938,5045915.5]},"properties":{"POTEAU_ID_POT":66342,"DATE_CONCEPTION_POT":20090707000000,"DESCRIPTION_REP":"Enlevé","DESCRIPTION_RTP":"1- Tige et base","X":296908.938,"Y":5045915.5,"ID_ARRONDISSEMENT":"25","TRC_ID":1090130}}
,{"type":"Feature","geometry":{"type":"Point","coordinates":[296481.188,5045804]},"properties":{"POTEAU_ID_POT":5030,"DATE_CONCEPTION_POT":20121108000000,"DESCRIPTION_REP":"Réel","DESCRIPTION_RTP":"1- Tige et base","X":296481.188,"Y":5045804,"ID_ARRONDISSEMENT":"25","TRC_ID":1100117}}

Answer 1

我找到了怎么做。如果您知道如何将UTM转换为WMI84纬度，经度，则可以转换MTM。将UTM转换为WGS84（lat，long）的公式为here on Wikipedia。

MTM就像UTM，但更精确。对于UTM，区域为3°大而不是6°。 scaleTM是0.9999而不是0.9996。假东移是304.8公里（而不是UTM的500公里）。

要在UTM中使用参考子午线，你可以refMeridian = Zone * 6° - 183°，但是对于MTM，我使用了一系列与他们的参考经线相对应的区域（我在互联网上找到）：

var zone_to_refmeridian =  // MTM zone to reference meridian
  [0, 53, 56, 58.5, 61.5, 64.5, 67.5, 70.5, 73.5,
   76.5, 79.5, 82.5, 81, 84, 87, 90, 93, 96, 99,
   102, 105, 108, 111, 114, 117, 120, 123, 126,
   129, 132, 135, 138, 141];

// For instance for Montreal city which is in zone 8:
zone_to_refmeridian[8] // for zone 8

Answer 2

这个网站对我将MTM转换为WGS84非常有用 http://leware.net/geo/utmgoogleapp.htm

如何将MTM（加拿大）坐标转换为纬度和经度

2 个答案: