13 votes
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What is the shortest path between two points on Earth's surface?

If you don't want to do the calculation yourself, you can use an online calculator like the one provided by NOAA. Alternatively, if you do want to do the calculation yourself you can use the ...
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9 votes

What is the shortest path between two points on Earth's surface?

45E is directly opposite 135W. It's therefore obvious (hopefully) that the shortest path is straight over the North pole (which is at 90 degrees North). The path takes us round 120 degrees of the ...
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  • 91
8 votes
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How do I convert between different east longitude coordinates?

The database with the negative longitude angles is storing longitude as eastings and westings, whereas the other database is storing everything as eastings. It appears you prefer your data as ...
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6 votes

In geology, what is apparent dip and how is it related to true dip?

From https://en.wikipedia.org/wiki/Strike_and_dip Apparent dip is the name of any dip measured in a vertical plane that is not perpendicular to the strike line. True dip can be calculated from ...
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3 votes

How do I convert between different east longitude coordinates?

In Matlab if you have the mapping toolbox you can simply do: lon2=wrapTo180(lon2); And your approach is totally right, but if you have to do it more often or with ...
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1 vote

Recommend books on Lat Long

https://www.amazon.com/Longitude-Genius-Greatest-Scientific-Problem/dp/080271529X I think you should read the book by Dava Sobell. It will give you perspective and lead you to original source ...
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