I have a database of lat/long positions. What I want to be able to do is to
be able to filter that database based on a selection by the user. In other
words the user picks point X and I want to know all the locations in my DB
that are within say, 50 feet or 500 feet of that point.
I am told there are several ways to do this. One way is to use a database
with spatial query support and write spatial queries. I'm told the other,
Old Skool way to do this is to use something called "haversign functions" --
sorry if I'm mangling the spelling -- and loop through your dataset (or
filter it in some more efficient way).
I will be using a spatially aware DB in the future. I would like to know how
to do this "manually", in programming, using the Haversign functions. I am
competent with working with C# and VS.NET. Can someone point me to a port of
these functions for C#?
Thanks,
-KF
2  2469 
Ah, good. I was baffled why my Googling offered only a few esoteric results.
For the benefit of anyone else going down the same path, this will get you
started: http://www.codeproject.com/KB/cs/dis...select=1309714
This includes a SQL function you could use in a non-spatially aware DB: http://megocode3.wordpress.com/2008/...-formula-in-c/
JavaScript implementation: http://groups.google.com.jm/group/Go...f089ac7277e828
PHP http://www.go4expert.com/forums/showthread.php?t=339
Wikipedia: http://en.wikipedia.org/wiki/Haversine_formula
-KF
"MC" <fo************ **@www.ai.uga.e du.slash.mcwrot e in message
news:#V******** ******@TK2MSFTN GP06.phx.gbl...
It's "haversine" and is well covered in Wikipedia.
"Ken Fine" <ke*****@newsgr oup.nospamwrote in message
news:8E******** *************** ***********@mic rosoft.com...
>>
I have a database of lat/long positions. What I want to be able to do is
to
be able to filter that database based on a selection by the user. In
other
words the user picks point X and I want to know all the locations in my
DB
that are within say, 50 feet or 500 feet of that point.
I am told there are several ways to do this. One way is to use a database
with spatial query support and write spatial queries. I'm told the other,
Old Skool way to do this is to use something called "haversign
functions" --
sorry if I'm mangling the spelling -- and loop through your dataset (or
filter it in some more efficient way).
I will be using a spatially aware DB in the future. I would like to know
how
to do this "manually", in programming, using the Haversign functions. I
am
competent with working with C# and VS.NET. Can someone point me to a port
of
these functions for C#?
Thanks,
-KF
Hi KF,
Thanks for sharing the resources with us. Really interesting and
informative.
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
--------------------
>From: "Ken Fine" <ke*****@newsgr oup.nospam>
References: <8E************ *************** *******@microso ft.com>
<#V************ **@TK2MSFTNGP06 .phx.gbl>
>Subject: Re: Looking for C# libraries of "Haversign" spatial functions
Date: Mon, 16 Jun 2008 16:45:17 -0700
>
Ah, good. I was baffled why my Googling offered only a few esoteric
results.
>For the benefit of anyone else going down the same path, this will get you
started:
http://www.codeproject.com/KB/cs/dis...x?df=100&forum
id=245892&exp=0 &select=1309 714
>
This includes a SQL function you could use in a non-spatially aware DB:
http://megocode3.wordpress.com/2008/...-formula-in-c/
JavaScript implementation:
http://groups.google.com.jm/group/Go...ad/thread/2ef0
89ac7277e828
>
PHP
http://www.go4expert.com/forums/showthread.php?t=339
Wikipedia:
http://en.wikipedia.org/wiki/Haversine_formula
-KF
"MC" <fo************ **@www.ai.uga.e du.slash.mcwrot e in message
news:#V******* *******@TK2MSFT NGP06.phx.gbl.. .
>It's "haversine" and is well covered in Wikipedia.
"Ken Fine" <ke*****@newsgr oup.nospamwrote in message
news:8E******* *************** ************@mi crosoft.com...
>>>
I have a database of lat/long positions. What I want to be able to do
is
>>to
be able to filter that database based on a selection by the user. In
other
words the user picks point X and I want to know all the locations in my
DB
that are within say, 50 feet or 500 feet of that point.
I am told there are several ways to do this. One way is to use a
database
>>with spatial query support and write spatial queries. I'm told the
other,
>>Old Skool way to do this is to use something called "haversign
functions" --
sorry if I'm mangling the spelling -- and loop through your dataset (or
filter it in some more efficient way).
I will be using a spatially aware DB in the future. I would like to
know
>>how
to do this "manually", in programming, using the Haversign functions. I
am
competent with working with C# and VS.NET. Can someone point me to a
port
>>of
these functions for C#?
Thanks,
-KF
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