Plotting on a Map using latitudes/longitudes(GPS)
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:( Can anyone help me in plotting on a map using latitudes and longitudes. Am doing a project in using GPS. The methods i used doesn't give enough accuracy. Can anyone give suggestions to improve accuracy. sibish
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:( Can anyone help me in plotting on a map using latitudes and longitudes. Am doing a project in using GPS. The methods i used doesn't give enough accuracy. Can anyone give suggestions to improve accuracy. sibish
Define 'accuracy' and 'plot'. What method did you use? What is its purpose? I have experience of plotting lat/long country outlines and GPS data onto a computer screen. Treat the lat/long as a coordinate in 3D space (polar coords with constant Radius - or is this the inaccuracy you talk about? Do you want a more accurate geoid(earth-shape)?). Convert to Cartesian coords (X, Y, Z) Then project onto a 2D surface. Which projection do you want to use? There are hundreds, but probably less than a dozen that cover 99% of needs. Each projection has its own strengths and weaknesses (read: inaccuracies). e.g. a Mercator allows sailors (& others) to travel at a constant bearing to reach their destination, but distorts shapes. To allow 'autosizing' of the display, I just used the min/max lat/long rectangle diagonal & scaled it - fine unless you're working near the poles (I was using Europe, US & Canada - Canada was almost a problem!). Give more specific details of what you're doing & want to achieve, and you could receive more specific help. Regards Brewman
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:( Can anyone help me in plotting on a map using latitudes and longitudes. Am doing a project in using GPS. The methods i used doesn't give enough accuracy. Can anyone give suggestions to improve accuracy. sibish
Dear Sir, i have already write an application for that issue, first of all you have to calibrate the map by putting thin point on it, by this way you can relate the coordinates oof the map with the UTM coordinates by this control points you will get an accurate tracking, the tracking error will be not more that 2-3 meters if you have any other Q you can ask me Regards Mhmoud Rawas ------------ Software Eng.
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:( Can anyone help me in plotting on a map using latitudes and longitudes. Am doing a project in using GPS. The methods i used doesn't give enough accuracy. Can anyone give suggestions to improve accuracy. sibish
If you're plotting simple Lat/Long as X/Y (or is that Y/X?) and your Long is too short(?!) on the map (i.e. if you 'walk' in a square and an oblong appears) ... then if: - area is small (less than say 100 miles/kilometres) - not a polar region then let LonAdj = Lon/cos(LatOfMapMidPoint) and plot that. If a polar region, plot as polar (radius = 90-abs(Lat) & theta/angle = Long * sign(Lat)) Regards Brewman
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Dear Sir, i have already write an application for that issue, first of all you have to calibrate the map by putting thin point on it, by this way you can relate the coordinates oof the map with the UTM coordinates by this control points you will get an accurate tracking, the tracking error will be not more that 2-3 meters if you have any other Q you can ask me Regards Mhmoud Rawas ------------ Software Eng.
Hi,:) Can you send me your application source code.Send to sibbsnb@yahoo.com Thank you sibish
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Hi,:) Can you send me your application source code.Send to sibbsnb@yahoo.com Thank you sibish