Tuesday 06/29/2010

• First day conducting final differential georeferencing in the field with new methods and tools. A bit rainy and cold, but otherwise a good day.

Step 1. Set up tripod over stake. Use plumb bob and bubble levels on tripod to make sure it is directly vertically over the stake.

  View from above. See bolt and nuts used to modify a standard camera tripod for static GPS measurements.

Step 2. Mount GPS antenna on tripod.

Step 3. Measure vertical height from base of antenna (phase center model adjusts for actual vertical distance) to the ground. Input this value into the GPS configuration file.

 

Step 4. Run GPS for 1-3 hours per location collecting differential data every 5 seconds. Back at home run post-processing using base station data collected from Mauna Kea.