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How To Validate Latitude And Longitude


how to validate latitude and longitude. regex for latitude and longitude


View 3 Replies (Posted: May 12, 2010 12:49 PM)

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Related Forum Messages For ASP.NET category:
Web Forms :: Get Location Name From Latitude And Longitude
I need to display the location name in the lable control based on passing the latitude and longitude values how could i do it

Posted: Feb 18, 2011 12:43 AM

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Posted: Feb 8 10 at 11:59

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Posted: Feb 1 10 at 10:34

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Find Distance By Latitude And Longitude?
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));
c_hold = 2 * Math.Atan2(Math.Sqrt(a_hold), Math.Sqrt(1 - a_hold));
// c_hold = (c_hold * 180) / 3.12;
distance = 6371 * c_hold;

the problem is Math funcation here calculate the things in radian i want it in degree. so i just found a formula to convert radian into degree but that formula does'nt convert the calculation correctly..

what to do bcoz there is'nt any other option to convert radian into degree..

Posted: Nov 13 10 at 16:30

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How To Show Google Map On Webpage Through Longitude And Latitude
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like

<table>
<tr>
<td>

map control here

</td>
<td>

here multiple links like Hyderabad,bangalore

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when user click on hyderabad link i need to show hyderabad area on the map,

but i need to show through longitude and latitude values.

iam working on asp.net with C#

Posted: Oct 06, 2009 07:01 AM

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Posted: Dec 18, 2009 06:14 AM

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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>

Posted: Jun 15 10 at 18:05

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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.

Posted: May 17, 2010 12:27 PM

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Posted: Jul 8 10 at 4:45

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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 enter29.30125 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?

Posted: Sep 07, 2010 09:36 PM

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I have latitudes and longitues in a table but they are in a nvarchar(50) field althought the values are like this -> 39.7355 I need to be able to convert those values to numeric to execute a calculation and update a new field

[Code]....

my radiantlatitude fieldis of type 'float'

Posted: Feb 01, 2011 07:16 PM

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Posted: Mar 03, 2010 10:10 AM

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Posted: Apr 12 10 at 12:02

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Posted: Feb 26, 2010 08:21 AM

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Latitude And Longitude Keep Changing Every Time Convert From Degrees Minutes Seconds To Decimal Degrees In C#
If I enter the a location of: Latitude = 28 Degrees, 45 Minutes, 12 Seconds Longitude = 81 Degrees, 39 Minutes, 32.4 Seconds. It gets converted into Decimal Degrees format to be stored in the database with the following code:

Coordinates coordinates = new Coordinates();
coordinates.LatitudeDirection = this.radLatNorth.Checked ? Coordinates.Direction.North : Coordinates.Direction.South;
coordinates.LatitudeDegree = this.ConvertDouble(this.txtLatDegree.Text);
coordinates.LatitudeMinute = this.ConvertDouble(this.txtLatMinute.Text);
coordinates.LatitudeSecond = this.ConvertDouble(this.txtLatSecond.Text);
coordinates.LongitudeDirection = radLongEast.Checked ? Coordinates.Direction.East : Coordinates.Direction.West;
coordinates.LongitudeDegree = this.ConvertDouble(this.txtLongDegree.Text);
coordinates.LongitudeMinute = this.ConvertDouble(this.txtLongMinute.Text);
coordinates.LongitudeSecond = this.ConvertDouble(this.txtLongSecond.Text);
//gets the calulated fields of Lat and Long
coordinates.ConvertDegreesMinutesSeconds();
In the above code, ConvertDouble is defined as:
private double ConvertDouble(string value)
{
double newValue = 0;
double.TryParse(value, out newValue);
return newValue;
}
and ConvertDegreesMinutesSeconds is defined as:
public void ConvertDegreesMinutesSeconds()
{
this.Latitude = this.LatitudeDegree + (this.LatitudeMinute / 60) + (this.LatitudeSecond / 3600);
this.Longitude = this.LongitudeDegree + (this.LongitudeMinute / 60) + (this.LongitudeSecond / 3600);
//adds the negative sign
if (LatitudeDirection == Direction.South)
{
this.Latitude = 0 - this.Latitude;
}
else if (LongitudeDirection == Direction.West)
{
this.Longitude = 0 - this.Longitude;
}
}

If I don't make any change to the latitude or longitude and I click Apply Changes which basically does the above calucation again, it generates a different latitude and longitude in the database. This happens every time I go to edit it and don't make a change (I just click Apply Changes and it does the calculation again with a different result). In the above scenario, the new Latitude and Longitude is: Latitude = 28 Degrees, 45 Minutes, 12 Seconds Longitude = 81 Degrees, 40 Minutes, 32.4 Seconds If I do it again, it becomes:
Latitude = 28 Degrees, 45 Minutes, 12 Seconds Longitude = 81 Degrees, 41 Minutes, 32.4 Seconds The other part of this is that when I go into edit, it takes the decimal degrees format of the latitude and longitude and converts it to the degrees minutes seconds format and puts them into their respective textboxes. The code for that is:

public void SetFields()
{
Coordinates coordinateLocation = new Coordinates();
coordinateLocation.Latitude = this.Latitude;
coordinateLocation.Longitude = this.Longitude;
coordinateLocation.ConvertDecimal();
this.radLatNorth.Checked =
coordinateLocation.LatitudeDirection == Coordinates.Direction.North;
this.radLatSouth.Checked = !this.radLatNorth.Checked;
this.txtLatDegree.Text = coordinateLocation.LatitudeDegree.ToString().Replace("-", string.Empty);
this.txtLatMinute.Text = Math.Round(coordinateLocation.LatitudeMinute, 0).ToString().Replace("-", string.Empty);
this.txtLatSecond.Text = Math.Round(coordinateLocation.LatitudeSecond, 2).ToString().Replace("-", string.Empty);
this.radLongEast.Checked =
coordinateLocation.LongitudeDirection == Coordinates.Direction.East;
this.radLongWest.Checked = !this.radLongEast.Checked;
this.txtLongDegree.Text = coordinateLocation.LongitudeDegree.ToString().Replace("-", string.Empty); ;
this.txtLongMinute.Text = Math.Round(coordinateLocation.LongitudeMinute, 0).ToString().Replace("-", string.Empty);
this.txtLongSecond.Text = Math.Round(coordinateLocation.LongitudeSecond, 2).ToString().Replace("-", string.Empty);
}

From the above examples, you can see that the Minute kept increasing by 1, which would indicate why it is generating a different latitude and longitude in decimal degrees in the database, so I guess the problem is more in the above area, but I am not sure where or why it is doing it?

public void ConvertDecimal()
{
this.LatitudeDirection = this.Latitude > 0 ? Direction.North : Direction.South;
this.LatitudeDegree = (int)Math.Truncate(this.Latitude);
if (LatitudeDirection == Direction.South)
{
this.LatitudeDegree = 0 - this.LatitudeDegree;
}
this.LatitudeMinute = (this.Latitude - Math.Truncate(this.Latitude)) * 60;
this.LatitudeSecond = (this.LatitudeMinute - Math.Truncate(this.LatitudeMinute)) * 60;
this.LongitudeDirection = this.Longitude > 0 ? Direction.East : Direction.West;
this.LongitudeDegree = (int)Math.Truncate(this.Longitude);
if (LongitudeDirection == Direction.West)
{
this.LongitudeDegree = 0 - this.LongitudeDegree;
}
this.LongitudeMinute = (this.Longitude - Math.Truncate(this.Longitude)) * 60;
this.LongitudeSecond = (this.LongitudeMinute - Math.Truncate(this.LongitudeMinute)) * 60;
}

Posted: Dec 7 10 at 16:27

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Posted: Jan 07, 2011 04:06 PM

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I have a bunch of events with their location being pulled from the db and I am doing the following:

List<Place> placeList = new List<Place>();
foreach (var item in eventsList)
{
bool coordinateExist= placeList.Where(x => x.latitude == item.Latitude && x.longitude == item.Longitude).Count()>0;
Place place;
if (coordinateExist)
place = new Place() { title = item.Title, latitude = item.Latitude+0.0001, longitude = item.Longitude};
else
place = new Place() { title = item.Title, latitude = item.Latitude, longitude = item.Longitude};
placeList.Add(place);
}

I have a slight issue though. If two locations have the exact same latitude and longitude I want to offset the latitude by the slightest amount (equiv to a few meters maybe?), and then add it to placeList. Hence I will have a list full of unique coordinates.

how can i achieve this nicely? The above works but not nice IMO

Posted: Feb 5 at 19:53

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string hold_latLong = "";
public void calDistance(PropertiesClass pc)
{

[code]...

Posted: Dec 27, 2010 08:20 AM

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Posted: Nov 09, 2009 03:45 AM

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Posted: Feb 14 10 at 17:52

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public class ModelData
{
public string ContactName { get; set; }
public string ContactAddress { get; set; }
public string ContactPhone { get; set; }
public bool RadioPoliceFire { get; set; }
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CONTROLLER...

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Posted: Apr 7 10 at 14:37

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{
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[code]...

Posted: Aug 31 10 at 0:51

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