Overview 5.1 Geospatial Data Quality: Validity, Accuracy, and Precision 5.2 Global Positioning Systems 5.3 GPS Error Sources 5.4 Correcting GPS Errors 5.5 Land Surveying and Conventional Techniques for Measuring Positions on the Earth’s Surface 5.6 Summary 5.7 Glossary 5.8 Bibliography Book traversal links for Chapter 5: How We Know Where We Are: Land Surveying, GPS, and Technology ‹ 4.8 Bibliography Up Overview › Printer-friendly version