The Global Positioning System

The Global Positioning System

GPS is a satellite navigation system that allows users to locate their approximate position on Earth. There are 27 satellites orbiting Earth, as shown in the below picture, for use with GPS units. The satellites are positioned around Earth, and are constantly orbiting so that signals from at least three or four satellites can be picked up at any given moment by a GPS receiver.

To use GPS to find your location on Earth, you need a GPS receiver. The receiver calculates your approximate latitude and longitude — usually within 10 m — by processing the signals emitted by the satellites. If enough information is present, these satellites can also relay information about elevation, direction of movement, and speed.With signals from three satellites, a GPS receiver can calculate location on Earth without elevation, while four satellite signals will allow a GPS receiver to calculate elevation also. For more information on how the satellites are used to determine location, see as picturized below.

The Geographic Information System

The Geographic Information System (GIS) combines many of the traditional types and styles of mapping described in this chapter. GIS mapping uses a database of information gathered by scientists, professionals, and students like you from around the world to create layers, or “themes,” of information that can be placed one on top of the other to create a comprehensive map. These “themes” are often maps that were created with information gathered by remote sensing.

Scientists from many disciplines use GIS technologies. A geologist might use GIS mapping when studying a volcano to help track historical eruptions. An ecologist might use GIS mapping to track pollution or to follow animal or plant population trends of a given area.

GIS mapsmight contain many layers of information compiled from several different types of maps, such as a geologic map and a topographic map.As shown in the below picture,layers such as rivers, topography, roads,and landforms from the same geographic area can beplaced on top of each other to create a comprehensive map. One major difference between GIS mapping and traditional mapping is that a GIS map can be updated as new information is loaded into the database. Once a map is created, the layers are still linked to the original information. If this information changes, the GIS layers also change. The result is a map that is always up-to-date — a valuable resource for people who rely on current information.

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Comments ( 17 )
  1. The Global Positioning System « Hourly Book
    October 19, 2012 at 6:16 pm
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  2. Md Aslam Ali
    January 1, 2013 at 11:12 am
    Reply

    GPS is a satellite navigation system & it’s verry usefull to anyone for findout location.a valuable resource for people who are willing to get correct information.

  3. Imran
    January 1, 2013 at 12:23 pm
    Reply

    WOW Thanks you for this blog really it is a great post. i will be Bookmarking your Blog and also subscribed via Email.

    Thanks
    Imran

  4. rahul
    January 2, 2013 at 7:49 pm
    Reply

    This post is really informative. gives us an insight on how the GPS works which is a very helpful technology. i will visit this site again.

  5. Adnaan Bheda
    January 3, 2013 at 12:08 pm
    Reply

    Wow great article , i had much interest reading this article than other articles 🙂

  6. manik
    January 6, 2013 at 11:11 am
    Reply

    actually this article is very good information article .the peoples can be acquire knowledge about satellite from here.GPS system is perfectly system for find the fixed location.

  7. kamal magar
    January 8, 2013 at 9:36 am
    Reply

    this is a good blog and this is a very importance artical i like this blog and website very much.

  8. Habib
    January 8, 2013 at 10:53 pm
    Reply

    Thanks author to posting such a good and informative article. I collect acquire knowledge about satellite from here.

  9. Harriet
    January 10, 2013 at 6:44 pm
    Reply

    Wow, i love this website, it’s great and really informative, keep up the good work and i will back on a regular basis.

  10. suyog
    January 11, 2013 at 11:31 am
    Reply

    superb article.really good one

  11. kamall
    January 11, 2013 at 10:22 pm
    Reply

    Really interested article. I really wasn’t aware that these satellites were so powerful and that it is as many as 27 of them being lunched into space.

  12. Leights Reid
    January 13, 2013 at 10:53 pm
    Reply

    Great article and website. I actually found these articles quite interesting.

  13. paulyn
    January 16, 2013 at 11:06 pm
    Reply

    Thanks for this informative post. Now I know there is different number of satellites are being used for different functions.

  14. bikx
    January 17, 2013 at 9:28 pm
    Reply

    I cant travel without GPS system,Good article

  15. Bjorn Karlman
    January 20, 2013 at 12:57 am
    Reply

    Great post! What is it that happens when your car GPS can’t find the signal? What is it that causes that kind of disturbance?

  16. Prasad Vylale
    January 20, 2013 at 1:35 pm
    Reply

    A good insight to Global Positioning System. Thank You for the article.

  17. sanjay
    January 25, 2013 at 8:43 pm
    Reply

    GPS to find any area…

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