Geospatial Evidence
Expert Witnessing
Attorney CLE Courses
Aerial & Drone Mapping​
ASPRS Certified Photogrammetrist, GISP
Practical, Litigation-Focused Instruction
These CLE courses are developed and taught by a practicing geospatial expert witness and focus on how geospatial evidence is actually used in litigation—not theory, software training, or abstract concepts.
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Instruction emphasizes:
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How historic imagery and elevation data are created
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What geospatial evidence can and cannot show
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Common pitfalls and misinterpretations
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How courts evaluate imagery-based evidence
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How attorneys can work effectively with geospatial experts
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The goal is to give attorneys confidence when evaluating, presenting and challenging geospatial evidence.
Upcoming Live CLE
Foundations of Geospatial Evidence (Module 1)
A practical introduction to using aerial imagery, topographic Lidar and other geospatial data in land-use litigation.
Format: Live webinar
Date: January 22nd, 2026
Credit: 1.0 credit hours, CLE approved (Colorado)
Instructor: Nathan Mangsen
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This course introduces the core concepts attorneys need to understand geospatial evidence, including a brief history of data collection, data sources and evidentiary limitations.
On-Demand CLE Access (Coming Soon)
An on-demand version of this course will be available following the live webinar. Additional modules will be released through 2026-2027.
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If you prefer self-paced learning or are unable to attend the live session, you may request notification when on-demand access becomes available.
CLE Course Series Roadmap
These courses are part of a growing CLE series focused on geospatial evidence in litigation.
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Module 1 — Foundations of Geospatial Evidence
Live: January 22 • On-demand coming soon -
Module 2 — Historic Aerial Imagery in Litigation
In-depth training on historic aerial photography, modern imaging programs, and their application in property and land-use disputes
(Planned for 2026) -
Module 3 — Lidar, Elevation & Obstruction Analysis
Lidar-based elevation, drainage, terrain change, and obstruction analysis for litigation
(Planned for 2026) -
Additional Modules
Advanced courses on change detection, case-specific geospatial analysis, and ethical best practices for evidentiary work
(Planned for 2026–2027)
Who These CLEs Are For
These courses are designed for attorneys who encounter spatial, land-based or imagery-driven issues, including:
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Real-property and boundary attorneys
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Land-use and zoning attorneys
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Environmental and natural resource attorneys
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Trial attorneys handling site-specific disputes
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Attorneys working with expert witnesses or technical evidence
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No technical background is required.
Instructor
Nathan Mangsen is a geospatial analyst and expert witness specializing in historic aerial imagery, Lidar analysis, and photogrammetry for litigation. He has supported more than 30 legal matters involving land-use, boundary, and environmental disputes and teaches CLE courses focused on the practical use of geospatial evidence. He is an ASPRS Certified Photogrammetrist (CP), a GISP, and holds a Master’s degree in GIS from Penn State University.