Web Forms :: Converting Latitude And Longitude Into X / Y Pixel Coordinates
May 17, 2010
I've been struggling for the past couple of days to get this right. I'm in the process of building something that takes a whole bunch of geographic points, builds a heat map from the data, then overlays it as a tile on Google Earth / Google Maps. A bit like this: [URL]
I have all the heatmap functionality nailed using random xy points. The last part is doing the actual conversion to convert my real lat/lng pairs into x/y pixels to be rendered onto the heatmap image. Lets say I the image is 500px x 500px. I know the min and max values for the lat/lng points, so technically I need to divide the spread between the pixels to get a pixel value for each degree based on the top left pixel of the image (0,0). I've been through so many examples, but I just cant get them to work. The last one I tried was this:
[Code]....
I feed data into my heatpoint function using these 2 functions above like this. Here's a set of 4 points:
[Code]....
The problem I get is that the result is the same for all the points - they all get plotted to exactly the same point. Now, the data is fairly localised, so I dont really need to take the curvature of the earth into consideration.
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i am trying to find distance by latitude and longtitude by using this formula mentioned in this site.
[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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I tried with the following but it doesn't work
var txtlat=document.getElementById('TextBox1').value=GMap1.getCenter().lat();
var txtlong=document.getElementById('TextBox2').value=GMap1.getCenter().lng();
It gives a JavaScript error as "Object doesn't support this property or method". How can i do this?
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication5._Default" %>
<%@ Register assembly="GMaps" namespace="Subgurim.Controles" tagprefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<cc1:GMap ID="GMap1" runat="server"
Key="ABQIAAAAs98ZVKM_IHFkRP_EavW_DhT2yXp_ZAY8_ufC3CFXhHIE1NvwkxQGoS16N7wYnBPhgtjTxMaUVN58kA" />
<br />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
<br />
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
</div>
<script type="text/javascript">
var txtlat=document.getElementById('TextBox1').value=GMap1.getCenter().lat();
var txtlong=document.getElementById('TextBox2').value=GMap1.getCenter().lng();
</script>
</form>
</body>
</html>
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var w = [], wp;
var rleg = directionsDisplay.directions.routes[0].legs[0];
data.start = {'lat': rleg.start_location.lat(), 'lng': rleg.start_location.lng()}
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var items = new Array();
[Xode] ....
Above code Output :
{"start":{"lat":22.3038548,"lng":70.80213219999996},"end":{"lat":22.470967,"lng":70.05772219999994},"waypoints":["jamnagar","kalavad"]}
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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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[Code] ....
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[CODE]...
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