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DPUG Meeting – May 16, 2013
Jerry Corr
Elizabeth Crawley
Habitat Management, Inc.
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Overview• Why we undertook this project
• Need in Market to Improve Cadastral Data but• Limited Budgets
• Help Clients to Improve Land Maps• Find a Better, Faster, Cheaper Way to Improve Coordinates.• Survey Grade not Required• Identify Areas Where Survey is Required
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Current Situation• Increasing Accuracy Requirements• Survey Data of Undefined or Insufficient Accuracy• 200 Year Old Documents• Survey Data Digitized from Topographic Maps• Well Locations Calculated from Footages / QQs• Lease Boundaries and Wells Aligned to Legacy Grids
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GCDB Geoprocessing Issue• GCDB Mismatches between Big Horn and Johnson counties
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Project Objectives• Is this a Feasible Idea?• Rapid Data Acquisition• Timely Data Acquisition• Improved Metadata
• Improve Schema Design• Photographs• Supplemental Information (State Board)• Corner Quality Information
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Business Drivers• Need to Improve Data
• Fit to Imagery• Publish Maps with Ownership on “Right Side” of Street.• Establish Published Corners / Control Points on the Map.• Proper Schema• Photographs• Create a “Regulatory Grid”• Improve Data to Meet Increased Regulatory Spacing
Requirements.
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Phase 1
Littleton:• Out of 49 section corners:• 7 found, 8 unidentified• Discrepancies between 6.5-80ft
East of Boulder• 39 wells• Discrepancies between 0.8-10.5ft• One was plugged and reclaimed
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T 1N R 66W
Ft. Lupton
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Decade # of Records1970 81980 171990 212000 22010 1
https://doraimage.state.co.us/L:Hkq3WH1Y0j12N1ZH/
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Out of 49 section corners:• 30 found• 7 were calculated from witness monuments• Discrepancies between 8.324-103.15ft• Average discrepancy = 32.548ft• 11 out of 55 were outside the error of 40ft• 2 were double marked
Findings
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40 ft
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Oil/Gas WellsFt. Lupton
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Findings• Number of wells used for the study: 49
• Discrepancy Range: 0.336-23.216ft
• Average Discrepancy = 6.564ft
• 20 wells that have been plugged
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Questions
Elizabeth Crawley, Habitat Management, IncEmail: [email protected]
Robert White, WhiteStarEmail: [email protected]