Mapping Piedmont Landforms in Arizona Using ArcGIS and the Trimble GeoXT Handheld GPS Receiver
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The document describes using ArcGIS and a Trimble GeoXT GPS receiver to map landforms and assess stability in a study area in Arizona. Key tasks included delineating landforms like pediments, fans and plains; identifying stable vs. unstable areas; assessing washes; and delineating erosion hazard setbacks. Field data including waypoints, photos and cross-sections were collected using the Trimble GeoXT and integrated with ArcGIS maps. The analysis identified 16 new active fans and numerous other unstable areas, and field verified over 20 miles of erosion setbacks.
Mapping Piedmont Landforms in Arizona Using ArcGIS and the Trimble GeoXT Handheld GPS Receiver
- 1. Mapping Piedmont Landforms in Arizona Using ArcGIS and the Trimble GeoXT Handheld GPS Receiver Anthony B. Alvarado, EIT and William J. Spitz, R.G.
- 2. TASK 2.6 GEOMORPHIC EVALUATION AND LANDFORM STABILITY ASSESSMENT STUDY AREA (146 mi 2 ) Buckeye/Sun Valley Area Drainage Master Study Hassayampa River White Tank Mountains Sun Valley Parkway Wagner Wash Buckeye FRS 2 Buckeye FRS 1 Area 4 Area 3 Granite Reef Aqueduct Buckeye FRS 3 I-10 TASK 2.6 STUDY AREA
- 3. Geomorphic Evaluation and Landform Stability Assessment Subtasks Piedmont Landform Delineation Pediments, Relict Fans, Alluvial Fans, Alluvial Plains Piedmont Landform Stability Assessment Stable vs Unstable Areas Existing Conditions Assessment of Primary Washes 160 miles of washes Delineation of Erosion Hazard Setbacks White Tanks Wash, other channels in Areas 2 & 3 Sediment Yield Study 100-year storm event for each Flood Retarding Structure.
- 4. Field Verification using ATV-mounted Trimble GeoXT GIS-based GPS. Trimble GeoXT
- 5. Trimble GeoXT Applications of the Trimble GeoXT Navigation & Tracking Georeferencing Field Photos Marking Waypoints or Hazards Taking Cross-Sections Verifying Boundary Delineations Real Time Mapping
- 6. Trimble GeoXT Free Real-Time GPS Correction: WAAS Wide Area Augmentation System created by FAA Helps guide aircraft in reduced weather conditions http://gps.faa.gov/ Accuracy Statistics from work in Arizona: HDOP: 81% of the time, 1.5m accuracy or better VDOP: 44% of the time, 1 – 2m accuracy The more time at a location, the better the accuracy.
- 7. ArcPad 6.0.3 Runs like a simpler version of ArcView 8. File Types: Shapefiles (GIS info), and MrSID or JPEG images (not Tiffs) GPS Photolink Runs separate from GeoXT Uses the Track Log along with a time synch photo. Trimble GeoXT
- 8. Piedmont Landform Delineation and Stability Assessment In-house mapping using ArcGIS Stage 1: Delineate lateral limits of the various piedmont landforms using: Existing Reports and Studies Soils Maps (NRCS) Geologic Maps (AZGS) Flood Hazard Maps (AZGS) FCDMC Topographic Maps (10-ft contour interval) Sequential Aerial Photography (FCDMC ) Stage 2: Delineate Stable Areas vs Unstable Areas Use historic aerial photo analysis to modify maps
- 9. Piedmont Landform Delineation and Stability Assessment 2003 Aerial Photography, Soils, and 10-ft Topography
- 10. Piedmont Landform Delineation and Stability Assessment Surficial Geology Mapping & Landforms
- 11. Piedmont Landform Delineation and Stability Assessment Flood Hazard Mapping & Stability Assessment
- 12. Piedmont Landform Delineation and Stability Assessment 0 2 miles 0 2 miles
- 13. Piedmont Landform Delineation and Stability Assessment Track Log Data Points
- 14. Piedmont Landform Delineation and Stability Assessment The Track Log Track Log DBF Table
- 15. Existing Conditions Assessment of Primary Washes
- 16. Existing Conditions Assessment of Primary Washes Marking Waypoints and Photos
- 17. Existing Conditions Assessment of Primary Washes Surveying Cross-Sections
- 18. Existing Conditions Assessment of Primary Washes View Downstream View Upstream Primary Wash 23 – Cross Section 47 Distance (ft) Elevation (ft) View Downstream
- 19. Delineation of Erosion Hazard Setbacks
- 20. Sediment Yield Analysis Sub-Basins, NRCS Soils, Topography, Slopes, and 2003 Aerial Photography
- 21. SUMMARY BSV ADMS Geomorphic Evaluation and Landform Stability Assessment Mapping Using ArcGIS Field Verification & Data Collection using Trimble GeoXT Summary of Results: Identified and delineated 16 new active alluvial fans Numerous other unstable areas delineated Existing conditions assessment of 160 miles of washes Field verification of over 20 miles of erosion setbacks
Editor's Notes
- #3: Purpose of this task: Quantify the extent of drainage, flooding, and erosion problems, sources, and hazards in the BSV area, and develop preliminary solutions to mitigate the identified concerns. My purpose in this presentation is to give a picture of how we used ArcGIS in combination with the use of the Trimble GeoXT Handheld and ATVs in the field to more accurately and efficiently map the BSV area.
- #4: Key Points: size of the area, length to cover of the washes – how to do this efficiently and accurately
- #5: Decided to use the Trimble GeoXT and use ATVs to cover more ground in less time.
- #8: There is a lot of other mobile software out there for the Trimble and other mobile PDA like devices.
- #9: Stage 2 analysis also used all of the above data
- #12: Purple areas are active alluvial fans.
- #13: Maps before field verification.
- #14: Gaps are due to crashing the Trimble because of the large Landforms shapefile (from driving so quickly) or just losing the signal.
- #15: This tracklog can then be used to georeference your photos so you know exactly where your photos were taken.
- #16: 160 miles along 34 primary washes. Point out where Phoenix is and where I-10 is. Note the location of White Tanks Wash, also Wagner Wash.
- #17: Other Key Points: Navigating to each primary wash
- #18: Here is me with our makeshift “survey rod” with the Trimble attached using a mount.
- #19: Example cross section
- #20: Red Lines are the Erosion Hazard Setbacks, The Blue lines are the Floodplain, and the yellow dots are our tracklog as we verified the floodplain limits + 50ft versus the Erosion Setbacks based on the low flow banklines & flow rates.
- #21: 3 drainage basins above the three flood retarding structures (or levees), roughly 100 sq miles in size total.