Tagged Questions
3
votes
0answers
122 views
Bearing/Course/Heading in WGS84 ellipsoid model
There is a common formula for computing the initial bearing for a course from lat1, lon1 to lat2, lon2. (And yes, I'm aware that the course will change when traveling).
atan2( sin(lon2-lon1) * ...
0
votes
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 ...
2
votes
2answers
705 views
ST_Distance versus ST_Distance_Spheroid?
As my client software uses lat/lon coordinates when communicating with my (spherical mercator) postgis database i decided to ST_Transform every geometry to WGS-84.
However i noticed that ST_Distance ...
