Tagged Questions
12
votes
2answers
206 views
What is the approximate error of the Pythagorean Theorem vs. Haversine Formula in measuring distances on a sphere at various scales?
Many people when first trying to calculate distances between two longitude / latitude pairs ask if Pythagorean theorem works as an appropriate distance function.
Most often people answer "no, the ...
8
votes
1answer
162 views
Great-circle lines in Equirectangular projection
Just to check that I'm on the right track:
Are all great-circles on the sphere and in equirectangular projection (i.e. latitude, longitude pairs) either:
meridians (i.e. going pole to pole)
of the ...
11
votes
2answers
798 views
Calculate distortion outside a UTM zone
One of my colleagues is working with data that is spread across two UTM zone. The majority of the data is in one zone, with a few outliers in another zone. He would like to know what the area ...
1
vote
1answer
172 views
Lambert cylindrical projection support in PostGis
Does PostGis support Lambert cylindrical projection or is there a way to add support for it? I'm probably searching the wrong terms, but google isn't bringing up anything useful. Any help is ...
5
votes
2answers
222 views
Does the Chamberlin trimetric projection map (some) great circles to straight lines?
I know that, in general, the Chamberlin trimetric projection maps most great circles on the sphere to some sort of non-straight curve on the flat map.
But what about the 3 special great circles ...
34
votes
5answers
3k views
Why is the 'straight line' path across continent so curved?
This is the result of mapping the straight line path from a point in US to Poland using Distance Measurement Tool.
Also, planes from Asia to US would travel almost over North Pole.
Why is the path ...
7
votes
3answers
393 views
Method to generate points in any projection
I am writing an application in ArcMap to generate a grid of points. These points have a very defined layout and I have worked out an algorithm that works great under a projected coordinate system. ...
