Mapping Stream Habitats with a Global Positioning System: Accuracy, Precision, and Comparison with Traditional Methods

摘要: We tested the precision and accuracy of Trimble GeoXT™ global positioning system (GPS) handheld receiver on point area features compared estimates stream habitat dimensions (e.g., lengths areas riffles pools) that were made in three different Oklahoma streams using GPS a tape measure. The differentially corrected (DGPS) points was not affected by number position fixes (i.e., geographic location estimates) averaged per DGPS point. Horizontal error ranged from 0.03 to 2.77 m did differ with measurements 0.1% 110.1% but decreased as increased. Again, independent polygon corner. lengths, widths, when measured two methods data collection (GPS measure), nor differences among change at sites contrasting morphologies. Measuring up 3.3 times faster average than measure, although signal interference high streambanks or overhanging vegetation occasionally limited satellite availability prolonged receiver. There also no mapped continuous versus fix method. Despite there being some disadvantages studies, measuring habitats resulted spatially referenced allowed assessment relative changes over time, often For most spatial scales interest, are adequate have logistical advantages traditional measurement.