3.4.10.2. Achievable accuracies

Try these first

1. 1.

   What does DGNSS stand for?

   Hint

   Look for the acronym definition in our discussions.

2. 2.

   What is the typical accuracy range for local surveys?

   Hint

   Recall our detail about local measurements.

3. 3.

   What does DOP stand for?

   • Dilution of Precision
   • Depth of Position
   • Data of Position

   Hint

   Think about how it reflects satellite arrangement.

4. 4.

   True or False: DGNSS can improve accuracy to less than ±1 m.

   • True
   • False

   Hint

   Consider the role of reference stations.

5. 5.

   Given a survey setup where DOP is measured at 10 and known accuracy of the GNSS is ±5m, what would be your expected accuracy based on DOP?

   Hint

   Think about how DOP scales with accuracy.

6. 6.

   If a local survey yields 2 mm accuracy and a regional survey yields 6 mm, what is the total improvement factor in accuracy from regional to local?

   Hint

   Divide regional accuracy by local to find the factor.