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.
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
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: TBA
Time: TBA
Credit: 1.0 credit hours, CLE approved (Colorado)
Instructor: Nathan Mangsen
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.
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: February 5, 2026 • 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
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.