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Nathan Mangsen

Geospatial Analyst   Expert Witness   Certified Photogrammetrist

SUMMARY

Nathan specializes in aerial image interpretation, topographic Lidar analysis, and the use of geospatial data in litigation. He has contributed to over 30 cases involving boundary disputes, land-use conflicts, environmental claims and historical evidence reconstruction.

PROFESSIONAL CREDENTIALS

  • 30+ legal cases supported

  • ASPRS Certified Photogrammetrist

  • GISCI GIS Professional

  • 700+ Photogrammetry and Lidar projects processed

  • M.S. in Geographic Information Systems, Penn State University

  • Approved CLE Provider, Colorado Supreme Court Department of Continuing Lawyer and Judicial Education

LEGAL EXPERIENCE

Nathan has provided analysis, expert declarations, reports and testimony for cases in:

  • adverse possession,

  • boundary disputes,

  • easement and access rights,

  • land-use planning and zoning,

  • vegetation disputes,

  • historical land development,

  • grading and drainage issues,

  • environmental change detection.

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WHAT I DO

  • Interpret historic aerial imagery

  • Analyze Lidar and topographic datasets

  • Conduct scene change detection

  • Create photogrammetric and Lidar reconstructions

  • Provide expert witness analysis and testimony

  • Teach lawyers how to use geospatial data for their practice

COMPANY BACKGROUND

Mangsen Mapping grew out of Resource Management Systems, Inc., a small GIS consulting company based in Ashfield, Massachusetts. Founded by Lester Garvin in 1993, the company was built on Lester’s 60+ years of experience in aerial image interpretation with US Naval Intelligence and several civilian firms.  RMS has provided geospatial research and support for more than 200 projects in legal, archaeological and environmental fields.

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Lester’s grandson, Nathan Mangsen, began working with Lester at RMS in 2015. That work coincided with Nathan beginning his Master’s in GIS at Penn State University. With a strong foundation in aerial image interpretation, Nathan’s studies introduced him to more remote sensing techniques and technologies. He began offering photogrammetry and Lidar data processing services in 2018 and took over sole control of RMS operations in 2022. Nathan has processed more than 600 photogrammetry and Lidar projects from both drone and manned aircraft. He has also provided research, documentation and witnessing services for more than 33 legal cases.

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Nathan completed his Master's in GIS in 2022. He also earned his GISP certification through the GIS Certification institute in 2023 and his ASPRS Certified Photogrammetrist rating in April, 2024.

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The legacy website for Research Management Systems can be viewed here.

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