Print 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 ‹ 4.8 Bibliography up Overview ›