Hi don ..We can Approach Like this this..See we can assume earth as a
Sphere there n points lies on that sphere so if any points lie on
that it must satisfy equation of sphere. okk.. then find the distance
of all the points from the center of sphere find the distance of
location form center .
Two Step Process:
1) Finding the distance to every point for the requestion point
2) Finding the min among those.
(n+n) -- O(n).
I think it cannot be this simple.. more inputs please...
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@sravanreddy001
u r not at plain surface its sphere :P :D. u have to go by angle
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Anshuman Mishra
IIIT Allahabad
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anshumishra6...@gmail.com
rit2007...@iiita.ac.in
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I think that calculating the three Dimentional distance should be fine
right?
The distance between two points on the sphere will be proportional to the
chord connecting them.
Which is nothing but the three dimentional distance. and then going with the
2nd step of finding the min, value among
@sravanreddy001
no u will go from point A to point B by walking on the surface not by making
the tunnel in the earth.
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yeah...sravan is absolutely rite. Assuming makin a tunnel wont affect affect
d result as far as finding relative closeness is needed.
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Mind it...its given the database stores latitude and longitudes...We
need to devise a formula that calculates distances between two points
based on latitudes and longitudes of two points..HOW CAN U FIND CHORD
LENGTHS BASED ON LATITUDES AND LONGITUDES
On 5/24/11, bhavana bhavana@gmail.com
@piyush
suppose A is latitude
nd B is longitude, R is raduis of earth
z = Rsin(A);
r' = Rcos(A); radius of circle at z height;
x = r'cos(B);
y = r'sin(B);
(x,y,z) is coordinate of point assuming (0,0,0) is the center of earth;
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@anshu.. I wanted to say to that.. even though I couldn't think of the
trignometic stuff..
thanks.. :)
--Sravan.
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I'm more interested in finding a good data structure to store the
points so that it is quick to narrow down the search to the points
which are fairly close. Think of a database with millions of points,
and there is not time to compute a distance to each one.
Don
On May 24, 8:15 am,
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