How To Validate Latitude And Longitude

May 12, 2010

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

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I need to display the location name in the lable control based on passing the latitude and longitude values how could i do it

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how can i raise event just after user change his position in google map using dragging map and get the latitude and longitude of center of google map and the miles its showing from center. i have got lots of pages on google related to it.. but not able to solve this.. please give me solution (i am using and javascript)

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Feb 1, 2010

I want to get latitude and longitude from address in one of my application, i know it s possible using google apis but i want to do it without showing google map. How can i do that? I also want to get distance between two pairs of latitude and longitude.

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Find Distance By Latitude And Longitude?

Nov 13, 2010

i am trying to find distance by latitude and longtitude by using this formula mentioned in this site.


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..

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i want to show map on my webpage,i have multiple locations on oneside and another side i have map area,

when user click on the link on one side that area i need to display on googlemap.



map control here


here multiple links like Hyderabad,bangalore


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 with C#

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Dec 18, 2009

I have big trouble in getting latitude and longitude from android2.0 operating system mobiles. In later versions i m using google gears and getting lat long. But android 2.0 Operating system did not support Google gears. How do i know get lat long from android 2.0 operating system mobiles.Does any body know about that please reply with solution?

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Get The Latitude And Longitude From The Gmap Control Into Textboxes

Jun 15, 2010

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" "">
<html xmlns="" >
<head runat="server">
<title>Untitled Page</title>
<form id="form1" runat="server">
<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>
<script type="text/javascript">
var txtlat=document.getElementById('TextBox1').value=GMap1.getCenter().lat();
var txtlong=document.getElementById('TextBox2').value=GMap1.getCenter().lng();

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i have a requirement, to find out user ipaddress and latitude and lagitude in .

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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:


I feed data into my heatpoint function using these 2 functions above like this. Here's a set of 4 points:


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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How to get latitude and longitude from windows mobile browser without using any external GPS device.

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C# - Future Local Time Of A Place Using Longitude Latitude And Datetime

Jul 8, 2010

i am developing a travel application. for that I need to calculate the future local datetime of a location using Datetime (a future date),longitude and latitude. (for Eg: i want to calculate the local datetime of a location on August-10- 2010 11.23 AM . Due to the day light saving time the datetime offset may change so i need to convert the august-10- 2010 11.23 AM to local time of the location) I have the inputs longitude, latitude and Date time. i can calculate the current local date using Longitude and latitude but cannot calculate accurately for *future date because of the day light saving time off set* . off set may varies on future dates. i am using and c# .

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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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SQL Server :: Converting A Latitude / Longitude Nvarchar(50) Of A Decimal Representation To A Numeric

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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


my radiantlatitude field is of type 'float'

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Mar 3, 2010

How to Track the Vehicles using Virtual earth control based on longitude and latitude.Every 5 seconds longitude and latitude values are coming from the database.based on these values vehicle position has to be changed. How to do it. Please give me complete code for this.

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I have Postcode in my large database, which contains values like SL5 9JH, LU1 3TQ etc. Now when I am pasting above postcode to it's pointing to a perfect location.. My requirement is like I want to pass post codes to and it should return a related latitude and longitude of that pointed location, that I want to store in my database. So, most probably there should be some javascript for that If anybody have another idea regarding that please provide it

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Architecture :: Need A Function Or Store Procedure Which Returns Only Locations Near By 10kms Of Given Longitude/latitude Parameters?

Feb 26, 2010

I have many locations stored with addresses and longitude/latitude information in my database.I need a function or store procedure which returns only locations near by 10kms of given longitude/latitude parameters.It is not neccesary to be a sql query but I am fine with any other solution.

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Latitude And Longitude Keep Changing Every Time Convert From Degrees Minutes Seconds To Decimal Degrees In C#

Dec 7, 2010

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
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;
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;

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Maps Based On Longitude & Latitude - Google Maps Or Bing Maps?

Jan 7, 2011

I need your advice to use Google Maps or Bing Maps with my form ASP.NET, and I wanaa the location based on Longitude & Latitude NOT by address.

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C# - Offset Latitude Slightly If Not Unique?

Feb 5, 2011

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};
place = new Place() { title = item.Title, latitude = item.Latitude, longitude = item.Longitude};

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

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Dec 27, 2010

I am working on Dating Site where i have to show most closest user's near to u on the basis of latitude and longtitude around the distance of 200 what i am doing currently . i just find all the users latitude and longtitude and then convert them into the distance and then checkingwheather they are under the distance of 200 k.m . if out of 500 , 10 are under the 200 k.m distance they are displayed with No Issue :).As I am from london so the closest users should be from london as i myself frm london than other users which are under the boundry of 200 k.m.But it shows according to users id. not according to there closness to me The Coding that i did is show below.

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


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Nov 9, 2009

I have used below code for validating email id using RegularExpressionValidator....but the below code only validate email id...I want validatate empty textbox also..

ErrorMessage="Enter Valid Email ID" ControlToValidate="txtemailaddress"

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<div id="locale">
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<div id="label">
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<%= Html.TextBox("label", null, new { @class = "required" })%>
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<%= Html.TextBox("sessionInput", null, new { @class = "required" })%>
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I am using MS MVC HTML Helpers to render this form. The resulting markup looks fine. IE each input and selection element contains the attribute 'class' with the value 'required'. When I submit this form the validation does noting.

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