Mapping Piedmont Landforms in Arizona Using ArcGIS and the Trimble GeoXT Handheld GPS Receiver
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Transcript of Mapping Piedmont Landforms in Arizona Using ArcGIS and the Trimble GeoXT Handheld GPS Receiver
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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.
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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
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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.
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• Field Verification using ATV-mounted Field Verification using ATV-mounted Trimble GeoXT GIS-based GPS.Trimble GeoXT GIS-based GPS.
Trimble GeoXTTrimble GeoXT
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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
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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.
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• 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
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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
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2003 Aerial Photography, Soils, 2003 Aerial Photography, Soils, and 10-ft Topographyand 10-ft Topography
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
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Surficial Geology Mapping & Surficial Geology Mapping & LandformsLandforms
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
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Flood Hazard Mapping & Flood Hazard Mapping & Stability AssessmentStability Assessment
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
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0 2
miles
0 2
miles
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
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Track LogTrack LogData PointsData Points
Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
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Piedmont Landform DelineationPiedmont Landform Delineationand Stability Assessmentand Stability Assessment
The Track Log
Track Log DBF Table
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Existing Conditions Assessment of Existing Conditions Assessment of Primary WashesPrimary Washes
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Existing Conditions Assessment of Existing Conditions Assessment of Primary WashesPrimary Washes
Marking Waypoints and Photos
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Existing Conditions Assessment of Existing Conditions Assessment of Primary WashesPrimary Washes
Surveying Cross-Sections
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Existing Conditions Assessment of Existing Conditions Assessment of Primary WashesPrimary Washes
Prim ary Wash 23 - Cross Section 47
1384.00
1385.00
1386.00
1387.00
1388.00
1389.00
1390.00
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1392.00
1393.00
1394.00
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1400.00
1401.00
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
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Delineation of Erosion Hazard SetbacksDelineation of Erosion Hazard Setbacks
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Sediment Yield AnalysisSediment Yield Analysis
Sub-Basins, NRCS Soils, Topography, Sub-Basins, NRCS Soils, Topography, Slopes, and 2003 Aerial PhotographySlopes, and 2003 Aerial Photography
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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
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Questions - CommentsQuestions - Comments