Spherical geometry is the geometry of the two-dimensional surface of a sphere.
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0answers
70 views
Placement of a fixed-radius circle on a sphere to maximize point containment
There are many papers on the "Circle Placement Problem" in 2D Euclidean space, but I haven't been able to find any papers discussing this problem on the sphere. The problem is: given a set of points ...
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1answer
193 views
Lat Long line intersecting with circle
Can anyone help me what's the algorythm to calculate points of intersection whet is given one point p1 [lat,long] , bearing x (let say 137 degrees), arc center [lat,long] and radius?
I woulde like to ...
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2answers
578 views
OpenLayers Circle not visible
I'm trying to draw a circle with OpenLayers with a Google Maps Layer. I'm able to transform a simple marker and have it draw at the correct location, but I can't figure out the circle. I'm trying to ...
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1answer
175 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 ...
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1answer
37 views
How to calculate smallcircle on sphere
I use this python code to calculate a greatcircle:
https://code.google.com/p/pyroms/source/browse/trunk/pyroms/greatcircle.py?r=39
After initializing the greatcircle I can calculate points on the ...
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2answers
3k views
How to convert lat long to meters using Mercator projection in C#
I have set of lat long values and I want their equivalent in meters using Mercator projection in C#. Can you please post some sample code or api example of some library that does exactly this?
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1answer
128 views
Spherical Mercator to Cylinder mercator?
Hello I want to create an overlay for google maps.
As far as I know google maps using Spherical Mercator, so the system where I read the maps use Mercator but is not specified which (spherical or ...
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1answer
56 views
Rhumb lines intersection
I looking for algorithm how to find out whether two rhumb lines given by point1 with azimuth1 and point2 with azimuth2 have intersecting point. Have anyone idea how to find intersection ?
For ...
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1answer
230 views
Convert Lat/Lon to Pixel-XY on cropped map
I've got a little problem.
I have a GPX-Track containing LatLon coordinates based on WGS84. The track should be drawn on a cropped map, and for this, I need the pixel coordinates. The map tiles are ...
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0answers
279 views
Implementing custom (Vincenty/Haversine formula) functions for MySQL vs Using PostGIS?
I currently am using MySQL for all of my relational data. I have hit a crossroads with geo calculations. Since, MySQL does not have good support for spatial functions, I am contemplating on using ...
