#GOOGLE MAPS OFFLINE FOR PC CODE#

For testing, you can put this latitude and longitude in Google earth and it will show the same position as shown by my application. In my application, when pointing any location on the map, it will display the latitude and longitude on the screen.

#GOOGLE MAPS OFFLINE FOR PC CODE#

In this article, the code example which I provided contains the working functionality for converting mouse position to latitude and longitude. Steps to Translate from 2 Dimensional Co-ordinates to Latitude and Longitude Note that all these screen values are particular to your application only, not to the complete screen. In this way, you can obtain the value of any position in latitude and longitude to in x, y format, and you can show a marker, dot, arrow or anything on that x, y value of computer screen. Hence we find the x, y values at this center.Д¬opy Code aDot.X = ( float)(projection.getXFromLongitude(longitudeInRadian)ДЄDot.Y = ( float)(projection.getYFromLatitude(latitudeInRadian)

In the above figure, the map is center at latitude = 24.846605 and longitude = 67.028379, and the resolution for the image is 800 by 800 pixels.

While taking images from Google map service, you can specify the center of the map and resolution of the map, hence this center is the center of that particular portion of the map. Therefore, in order to work with a portion of the image first, we must know the center of that portion of an image. The limits of the size of the map are bounded by the screen resolution. At higher zoom level, we can only display the map for a particular area. In this step, we have to convert the above-calculated x, y values to screen coordinates. For converting them to our specific map on the screen, we have to perform some translations which are described in the next step. Up to this step, we now have the x and y values, but these x, y values are for the complete Mercator projection. The number of tiles per zoom level is given by: There are different number of tiles for each zoom level. At each zoom level, they have divided the map into tiles. They organize images at different zoom levels. Google people also use the Mercator projection. One is that the formula is not defined for 90-degree values, another is values obtain from these formulas contain some error which is very tiny. There are some limitations to Mercator projection. Mercator projection model can be found on the internet easily and there is a good description of Mercator projection on Wikipedia. In Mercator projection, each and every individual point on the earth is first projected to inside surface of a cylinder and then that cylinder expanded to view the whole globe. Mercator projection is a kind of projection. To define it simply, a projection in the field of cartography is a field in which you draw the map of the whole world which is 3D onto a 2-dimensional surface. You can utilize the information present in this article to apply to different projections methodologies. Similar to Mercator projection, there are more advanced projections available which are more accurate, but for the sake of simplicity, I chose the Mercator projection. I have addressed all these difficulties and implemented the Mercator projection using C#.NET. In order to apply Mercator projection, you need to calculate different parameters such as radius, circumference, and others.

You can easily understand the Mercator projection, but to apply that to Google images and to program that in the computer is a slightly difficult problem. It was the requirement in one of my projects. The main problem is to convert Latitude and longitude values to screen coordinates. The things such as XNA framework, Winforms API, and Mercator projection formulas are easily available. In this way, you can use Google maps offline in Windows. If you run the application file included with this article, you will see that mouse coordinates (X,Y) will be shown on the screen and their real world latitude and longitude values as soon as you move the mouse in the application window. In the upper left corner of the window above X, Y shows the screen co-coordinates for the Yellow pointer and latitude and longitude shows the real world latitude and longitude of the Yellow pointer on to the screen. I have included the code files to demonstrate how you can convert the mouse position on the map to real world latitude and longitude values, which is demonstrated in the figure below: Although I have taken the image data from Google, all the background processing for calculating the latitude and longitude is done by me using Mercator projection method. In this article, I will discuss a problem about how we can calculate the latitude and longitude information for a particular location, without using any online service such as Microsoft, or Google map service.

Google maps offline for pc