SQL Server :: Query To Return Results Based On Latitude / Longitude Within Certain Radius
Sep 7, 2010
I cant seem to find a good example of how to build the query logic. We are allowing users to search based on lat/long and need to add radius as another parameter. So you enter 29.30125 as the latitude and -95.04590 as the longitude and pick say 15miles as the radius, i need to return all records that fall within that radius.. can someone suggest a good site to review this type of query?
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[URL]
every thing is Ok there when i do it by calculator but when i started doing it by programmatically there is a diiference in result.
here is my part of code
lat = Convert.ToDouble( (s3[a]));
longt =Convert.ToDouble( (s4[a]));
Avg_lat = pc._Latitude - lat;
Avg_longt = pc._Longitude - longt;
a_hold =( Math.Sin(Avg_lat / 2) * Math.Sin(Avg_lat / 2) )+ (Math.Cos(pc._Latitude) * Math.Cos(lat)) * (Math.Sin(Avg_longt / 2) * Math.Sin(Avg_longt / 2));
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<%@ Register assembly="GMaps" namespace="Subgurim.Controles" tagprefix="cc1" %>
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<head runat="server">
<title>Untitled Page</title>
</head>
<body>
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<div>
<cc1:GMap ID="GMap1" runat="server"
Key="ABQIAAAAs98ZVKM_IHFkRP_EavW_DhT2yXp_ZAY8_ufC3CFXhHIE1NvwkxQGoS16N7wYnBPhgtjTxMaUVN58kA" />
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<br />
<br />
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
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[Code]....
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[Code]....
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var w = [], wp;
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var items = new Array();
[Xode] ....
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{"start":{"lat":22.3038548,"lng":70.80213219999996},"end":{"lat":22.470967,"lng":70.05772219999994},"waypoints":[[22.224905,70.62623409999992],[22.509108,70.22394120000001]]}
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