High Accuracy GIS Data Collection Using Current GPS Technologies
Kevin Brown 1m
1cm
5m
10cm 50 m
GPS accuracy — Many accuracies can be achieved — Accuracy depends on many variables — GPS accuracy is dynamic
Variables — Design of receiver and antenna — recreational, mapping grade, survey grade, etc…
— Relative positions of satellites — PDOP, HDOP, VDOP
— Quality of signal (SNR) — Local/Regional/Global sources of error — SA Removed May 1st 2000 — ionosphere, troposphere, multipath
— Occupation time — Use of differential techniques — Real-time, post-processed
Achievable accuracy: 0.01-50m 1m
1cm
5m
10cm 50 m
How is High-Accuracy Achieved? — Dual frequency — Better/more base stations — Better field software — Better processing software — Better hardware — Real-time corrections — VRS in real time!! — Floodlight!!!!
Evolution!
… and now
Trimble GeoExplorer 6000 Series with Floodlight Satellite Shadow Reduction Technology
Floodlight only available on Trimble GeoExplorer 6000 Series Handhelds
How Does Floodlight Work? • GPS + GLONASS • New satellite tracking algorithms • Altitude constrained positioning • It just works!
Before Floodlight and After…
How can having higher GPS accuracy help you?
GPS Applications in Forestry — Acquire, Organize and Manage Information — Forest Type and Management Scheduling and Analysis — Soil Type Categorization and Forest Management
Planning — Wetlands Categorization and Analysis — Roads/Trails Access Efficiency and Planning — More accurate data is better data!!
That’s all folks! If you have any questions feel free to contact me: Kevin Brown- CSDS San Diego Office GPS/GIS Rep Phone: 619-534-1118 Email: [email protected] Thanks and have a great day!
1cm
5m
10cm 50 m
GPS accuracy — Many accuracies can be achieved — Accuracy depends on many variables — GPS accuracy is dynamic
Variables — Design of receiver and antenna — recreational, mapping grade, survey grade, etc…
— Relative positions of satellites — PDOP, HDOP, VDOP
— Quality of signal (SNR) — Local/Regional/Global sources of error — SA Removed May 1st 2000 — ionosphere, troposphere, multipath
— Occupation time — Use of differential techniques — Real-time, post-processed
Achievable accuracy: 0.01-50m 1m
1cm
5m
10cm 50 m
How is High-Accuracy Achieved? — Dual frequency — Better/more base stations — Better field software — Better processing software — Better hardware — Real-time corrections — VRS in real time!! — Floodlight!!!!
Evolution!
… and now
Trimble GeoExplorer 6000 Series with Floodlight Satellite Shadow Reduction Technology
Floodlight only available on Trimble GeoExplorer 6000 Series Handhelds
How Does Floodlight Work? • GPS + GLONASS • New satellite tracking algorithms • Altitude constrained positioning • It just works!
Before Floodlight and After…
How can having higher GPS accuracy help you?
GPS Applications in Forestry — Acquire, Organize and Manage Information — Forest Type and Management Scheduling and Analysis — Soil Type Categorization and Forest Management
Planning — Wetlands Categorization and Analysis — Roads/Trails Access Efficiency and Planning — More accurate data is better data!!
That’s all folks! If you have any questions feel free to contact me: Kevin Brown- CSDS San Diego Office GPS/GIS Rep Phone: 619-534-1118 Email: [email protected] Thanks and have a great day!
