using arcgis to design wetland restorationsskralston.com/usfws/using_arcgis_to_design_wetland... ·...
TRANSCRIPT
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Using ArcGIS to Design Wetland Restorations
By Scott Ralston, USFWS Windom, MN
Available for Download from: SKRalston.com/USFWS/
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How many still use this?
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Probably use this?
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Calculation of Cut/Fill Volumes
• Complex terrain hard to accurately calculate based on station readings
• Poor volume estimates impact cost over or under estimating bid volumes
• Using digital 3D Terrain in GIS can get accurate volumes
• Fast, easy construction staking using GPS• Potential to export to GPS guided grading in construction equipment for finish work
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Need digital elevation data to make a 3‐dimentional model of the landscape in GIS
• Garbage in/Garbage out. Better quality survey data will result in more accurate calculations
• Use survey grade GPS in hand pole method or continuous topo mode on ATV
• Using laser level, tie shots to a GPS point– Use a Geoditic Benchmark to tie to MSL elevation– Or integrate with LIDAR using a common point like center of a road intersection to get MSL
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Using LIDAR Elevation at a road intersection to tie to laser level surveys
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Need digital elevation data
• Use LIDAR Elevations– Download LIDAR for your state/county etc.– Most LIDAR is accurate within 6 inches or less for hard surfaces like crop ground, upland grasslands, particularly good on roads.
– Does not penetrate water or heavy thick vegetation like trees or cattail
– Can easily develop hybrid maps using LIDAR for upland areas and fill in low wet areas with survey data.
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LIDAR usually comes in “Raster” form.
Clip to your Work AreaConvert to 3D TIN or to a
Point File
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Convert your LIDAR to point files
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Buffer the LIDAR data by the Survey Points
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Match the Elevation Units to the units in the coordinate
system.For UTM NAD83 or WGS84
use Meters
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Create Hybrid Landscape For Survey & LIDAR Data
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Create Contour Lines
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Draw dike center line.Over‐draw longer than you think you need it.
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Draw dike center line.Buffer for top width.
Buffer for Slope Length.Slope, over estimate .If 6ft tall dike with 5:1,
Buffer 10ft tall so 5X10=50ft, Overestimate
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Assign elevations to lines.Convert to Meters.
If toe of slope is 50ft at 5:1 then elevation of toe is 10ft lower than the top.
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Create 3D TIN for the dikes
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Use Surface Difference Tool to calculate cut/fill
volumes
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Volumes are in Cubic Meters, Area is Square Meters, Convert
to Cubic Yards & acres.Delete non‐relevent data
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For Sod Stripping, take Depth X Area X Unit conversions.
For Core Trench, measure Length of desired Trench X Width X Depth
X Unit Conversions
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Cut Dike Fill Polygon to divide top from slopes
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Export Dike Shapefile to GPS for construction staking
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Use GPS in field with Shapefile displayed as the Active Map to mark out dike footprint/toe,
centerline or top.
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Use GPS in field with Shapefile displayed as the Active Map to mark out dike footprint/toe,
centerline or top.
![Page 25: Using ArcGIS to Design Wetland Restorationsskralston.com/USFWS/Using_ArcGIS_to_Design_Wetland... · 2018-01-28 · Using ArcGIS to Design Wetland Restorations By Scott Ralston, USFWS](https://reader035.vdocuments.site/reader035/viewer/2022081406/5f11fa921930367f0f712ef7/html5/thumbnails/25.jpg)
Available for Download from:
SKRalston.com/USFWS/
Thank
You!