Hello Michael
Thank you for your answer!
About my second question, I want to know if I'm doing the right thing (most
efficient): I want to have the "dynamic" characteristic of Coordinate (ie,
change values) but I also want to have the funcionality of Point, want to
use the geometric operations. So I think I must use Coordinate in my class
and then instantiate a Point/Geometry with the coordinate's value everytime
I need to perform a calculation. Is that right?
Roberto
On Mar 30, 2009 8:05pm, Michael Bedward <[email protected]> wrote:
Hi Roberto,
For your first question, the short answer is that JTS works with
cartesian (planar) geometry so it won't deal correctly with distances
between points on the globe expressed as lat/long coords. There are
various ways to do what you want. See this recent discussion...
http://n2.nabble.com/Lat-lon-coordinate-systems.-td2275815.html
For your second question. If you have created a Coordinate object to
hold current position, you can always change the x and y values
without needing to construct a new object..
Coordinate c = new Coordinate();
cx = ...
cy = ...
// later
cx = ...
cy = ...
But perhaps I don't understand your question correctly. If not,
please say so...
Hope this helps
Michael
2009/3/31 [email protected]>:
> I'ma beginner and have two questions I couldn't find the answer in
> documentation:
>
> - Is it possible to define a projection system for my calculations?
Example,
> I want to calculate the distance in km between two points that has
> coordinates in latitude/longitude degrees in a given projection system
for
> Earth.
>
> - I made a class that represents a moving object, so I used Coordinate
> implement its location (that changes all the time). I wanted to use
Point,
> but Coordinate is the best class for dynamic info. So I'm instantiating
a
> new Geometry everytime I need to perform calculation using this
objects, is
> that right?
>
> Thank you.
> _______________________________________________
> jts-devel mailing list
> [email protected]
> http://lists.refractions.net/mailman/listinfo/jts-devel
>
>
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