问题
The Problem
I have downloaded the Master Stations Names File from the UK's Rail Delivery group. I'm trying to map the dataset and would like to extract the locations. I tried using pyproj in my Python script, but the results are wrong. The "Eastings" and "Northings" they provide don't seem to fit the National Grid. For example:
York station is given as "14596 64517". If these were epsg:27700, they would translate to -7.420284219986337 50.35401717940486, which is somewhere off the coast of Cornwall.
The documentation for the file says the following:
"Easting in units of 100m. Stations too far south (Channel Islands) or too far north (Orkneys) or too far west (west of Carrick on Shannon) have both their Easting and Northing set to 00000. The most westerly station in range, Carrick on Shannon, has value 10000. The most easterly station, Amsterdam, has value 18690."
and
"Northing in units of 100m. Stations too far south (Channel Islands) or too far north (Orkneys) or too far west (west of Carrick on Shannon) have both their Easting and Northing set to 00000. The most southerly station in range, Lizard (Bus), has value 60126. The most northerly station in range, Scrabster, has value 69703."
but that still doesn't tell me the actual format they are in. Google didn't help - I'm not even sure what to look for.
Question
What format are these coordinates in and how can I transform them into epsg:4326?
回答1:
One would think that such a seemingly custom format would be better documented but there you go. After much experimenting and playing with the coordinates given, I came up with the formula:
realEastings = (eastingsInData - 10000) * 100
realNorthings = (northingsInData - 60000) * 100
Why anyone would use this is beyond me, but hopefully this post can be useful for somebody else.
来源：https://stackoverflow.com/questions/54555623/what-format-are-atoc-master-stations-file-eastings-and-northings-in