1. Updating Statistical maps with GPS

2. Global Positioning System Space segment Control segment Users Segment

3. GPS Satellites Name: NAVSTAR Manufacturer: Rockwell International Altitude: 10,900 nautical miles Weight: 1900 lbs (in orbit) Size:17 ft with solar panels extended Orbital Period: 12 hours Orbital Plane: 55 degrees to equatorial plane Planned Lifespan: 7.5 years Current constellation: 24 Block II production satellites Future satellites: 21 Block IIrs developed by Martin Marietta Space segment

5. Users Segment

7. Projection

10. Errors: Atmospheric error Clock & Orbit Error Multi path Error S.A. (Selective Availability) A.S. (Anti Spoofing) DOP(Dilution Of Precision)

11. Differential GPS

12. Positioning Methods: Static method Kinematic method Stop & Go method

13. Choosing suitable receiver:

14. Updating Statistical maps with GPS 1- Rural Maps (Scale 1:50000) 2-Urban Maps (scale 1:2000)

15. مرغداري حيدري Rural Maps:

16. Updating Roads:

17. Urban Maps:

27. Problems: in the urban areas the high buildings and trees were caused cycle slip and slowness the work.

28. Result: updating the urban and rural maps of 2 provinces.