[Marble-devel] Review Request 122989: Adding the path calculation method in annonate plugin for polyline

[hardik beladiya]

> On March 17, 2015, 6:36 p.m., Torsten Rahn wrote:
> > You are reinventing lots of wheels here - we have similar methods in place already. Please check GeoDataLineString::length(). Make sure that whatever you implement based on that also works for other planets and not only for the Earth :-)
> 
> Torsten Rahn wrote:
>     Hi, can you please use the reviewboard for replies? :-)
>     
>     > Thank you for reply Torsten and i want to implement a part in which we export a map in high resolution image so my 
>     > plan is to after we get the value from the image that he want to export in particular pixel we download that region and 
>     > joins the small fragment of image and make it large.
>     
>     Adding support for higher resolutions in Marble is a good goal and in fact I thought about adding it as a GSoC Project already.
>     However I still don't understand how you want to accomplish this. Can you explain it in more detail? Then I will be able to tell you whether the approach is good or whether there are better means in place in Marble to reach that goal.

Hi sorry i didnt see the upper part of the message i start reply using gmail :)


- hardik


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On March 17, 2015, 3:45 p.m., hardik  beladiya wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/122989/
> -----------------------------------------------------------
> 
> (Updated March 17, 2015, 3:45 p.m.)
> 
> 
> Review request for Marble and Torsten Rahn.
> 
> 
> Bugs: 345263
>     http://bugs.kde.org/show_bug.cgi?id=345263
> 
> 
> Repository: marble
> 
> 
> Description
> -------
> 
> Objective : Integration of marble with haversine formula  for calculation of path distance .
> 
> 
> Research: There are few method from which we can calculate distance between two latitude and longitude point or we can say geographic coordinate . Some of the method are given here
> 1. haversine method
> 2.Spherical Law of Cosines
> 3.Equirectangular approximation
> 4.Bearing
> 
> Choosing right Method
> I choose haversine  method because haversine formula   calculate the great-circle distance between two points – that is, the shortest distance over the earth’s surface – giving an ‘as-the-crow-flies’ distance between the points (ignoring any hills ) and  remains particularly well-conditioned for numerical computa­tion even at small distances’ – unlike calculations based on the spherical law of cosines
> 
> 
> Distance calculation using the 'haversine' formula which is basically calculate the shotrtest distance between two point in earth surface
> 
> Haversine A  = sin²(??/2) + cos ?1 ? cos ?2 ? sin²(??/2) ;
> c = 2 ? atan2( ?A, ?(1?A) )
> d = R ? c 
> 
> A= is the square of half the chord length between the points.
> R=mean radius of earth =6371
> c =is the angular distance in radians
> 
> solution.
> 1). First of all we make function to calculate the distance between two point 
> 	eg. pointdistance(  lon,  lat , lon1,  lat1)
> 2)After we call this pointdistace() function  in the fuction pathdistance() and pass the value of       parameter and calculate the distance iterative.
> 	eg. Pathdistance(){
> 		for size of the vector -1 {
> 	distance +=pointdistance(  lon,  lat , lon1,  lat1);
> 	}	
> }
> 
> 
> Diffs
> -----
> 
>   src/plugins/render/annotate/EditPolylineDialog.h 4d383b8 
>   src/plugins/render/annotate/EditPolylineDialog.cpp a99a3e9 
> 
> Diff: https://git.reviewboard.kde.org/r/122989/diff/
> 
> 
> Testing
> -------
> 
> yes tested with the google map and the distance coming from the google map and our marble are same :)
> 
> 
> Thanks,
> 
> hardik  beladiya
> 
>

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