mapping piedmont landforms in arizona using arcgis and the trimble geoxt handheld gps receiver
DESCRIPTION
Arid Regions Conference 2004 PresentationTRANSCRIPT
Mapping Piedmont Landforms in Arizona Using ArcGIS and the Trimble GeoXT
Handheld GPS Receiver
Anthony B. Alvarado, EITAnthony B. Alvarado, EITandand
William J. Spitz, R.G.William J. Spitz, R.G.
TASK 2.6TASK 2.6GEOMORPHIC GEOMORPHIC EVALUATION EVALUATION
ANDANDLANDFORM LANDFORM STABILITY STABILITY
ASSESSMENTASSESSMENTSTUDYSTUDYAREAAREA
(146 mi(146 mi22))
Buckeye/Sun ValleyBuckeye/Sun ValleyArea Drainage Master StudyArea Drainage Master Study
HassayampaRiver
WhiteWhite
TankTank
MountainsMountains
Sun ValleyParkway
WagnerWash
BuckeyeFRS 2
BuckeyeFRS 1
Area 4
Area 3
Granite ReefAqueduct
BuckeyeFRS 3
I-10
TASK 2.6 STUDY AREA
Geomorphic Evaluation andGeomorphic Evaluation andLandform Stability Assessment SubtasksLandform Stability Assessment Subtasks
• Piedmont Landform DelineationPiedmont Landform Delineation– Pediments, Relict Fans, Alluvial Fans, Alluvial PlainsPediments, Relict Fans, Alluvial Fans, Alluvial Plains
• Piedmont Landform Stability AssessmentPiedmont Landform Stability Assessment– Stable vs Unstable AreasStable vs Unstable Areas
• Existing Conditions Assessment of Primary Existing Conditions Assessment of Primary WashesWashes– 160 miles of washes160 miles of washes
• Delineation of Erosion Hazard SetbacksDelineation of Erosion Hazard Setbacks– White Tanks Wash, other channels in Areas 2 & 3White Tanks Wash, other channels in Areas 2 & 3
• Sediment Yield StudySediment Yield Study– 100-year storm event for each Flood Retarding Structure.100-year storm event for each Flood Retarding Structure.
• Field Verification using ATV-mounted Field Verification using ATV-mounted Trimble GeoXT GIS-based GPS.Trimble GeoXT GIS-based GPS.
Trimble GeoXTTrimble GeoXT
Trimble GeoXTTrimble GeoXT
Applications of the Trimble GeoXT– Navigation & Tracking– Georeferencing Field Photos– Marking Waypoints or Hazards– Taking Cross-Sections– Verifying Boundary Delineations– Real Time Mapping
Trimble GeoXTTrimble 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.
• 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 GeoXTTrimble GeoXT
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
• In-house mapping using ArcGISIn-house mapping using ArcGIS• Stage 1: Delineate lateral limits of the various Stage 1: Delineate lateral limits of the various
piedmont landforms using:piedmont landforms using:• Existing Reports and StudiesExisting Reports and Studies
• Soils Maps (NRCS)Soils Maps (NRCS)
• Geologic Maps (AZGS)Geologic Maps (AZGS)
• Flood Hazard Maps (AZGS)Flood Hazard Maps (AZGS)
• FCDMC Topographic Maps (10-ft contour interval)FCDMC Topographic Maps (10-ft contour interval)
• Sequential Aerial Photography (FCDMCSequential Aerial Photography (FCDMC))
• Stage 2: DelineateStage 2: Delineate Stable AreasStable Areas vs vs Unstable AreasUnstable Areas• Use historic aerial photo analysis to modify mapsUse historic aerial photo analysis to modify maps
2003 Aerial Photography, Soils, 2003 Aerial Photography, Soils, and 10-ft Topographyand 10-ft Topography
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
Surficial Geology Mapping & Surficial Geology Mapping & LandformsLandforms
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
Flood Hazard Mapping & Flood Hazard Mapping & Stability AssessmentStability Assessment
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
0 2
miles
0 2
miles
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
Track LogTrack LogData PointsData Points
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
The Track Log
Track Log DBF Table
Existing Conditions Assessment of Existing Conditions Assessment of Primary WashesPrimary Washes
Existing Conditions Assessment of Existing Conditions Assessment of Primary WashesPrimary Washes
Marking Waypoints and Photos
Existing Conditions Assessment of Existing Conditions Assessment of Primary WashesPrimary Washes
Surveying Cross-Sections
Existing Conditions Assessment of Existing Conditions Assessment of Primary WashesPrimary Washes
Prim ary Wash 23 - Cross Section 47
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0 20 40 60 80 100 120 140 160 180
Distance (ft)
Ell
ips
oid
Ele
va
tio
n (
ft)
View Downstream View Upstream
Primary Wash 23 – Cross Section 47
Distance (ft)
Ele
vati
on
(ft
) View Downstream
Delineation of Erosion Hazard SetbacksDelineation of Erosion Hazard Setbacks
Sediment Yield AnalysisSediment Yield Analysis
Sub-Basins, NRCS Soils, Topography, Sub-Basins, NRCS Soils, Topography, Slopes, and 2003 Aerial PhotographySlopes, and 2003 Aerial Photography
SUMMARYSUMMARY
• BSV ADMS Geomorphic Evaluation and BSV ADMS Geomorphic Evaluation and Landform Stability Assessment Mapping Landform Stability Assessment Mapping Using ArcGISUsing ArcGIS
• Field Verification & Data Collection using Field Verification & Data Collection using Trimble GeoXTTrimble GeoXT
• Summary of Results:Summary of Results:– Identified and delineated 16 new active alluvial fansIdentified and delineated 16 new active alluvial fans
– Numerous other unstable areas delineatedNumerous other unstable areas delineated
– Existing conditions assessment of 160 miles of washes Existing conditions assessment of 160 miles of washes
– Field verification of over 20 miles of erosion setbacksField verification of over 20 miles of erosion setbacks
Questions - CommentsQuestions - Comments