Photogrammetry

Art, Science & Technology

The American Society for Photogrammetry and Remote Sensing (ASPRS) defines Photogrammetry as ‘the art, science, and technology of obtaining reliable information about physical objects and the environment, through processes of recording, measuring, and interpreting images and patterns of electromagnetic radiant energy and other phenomena.’ We use this technology to provide high-detail surface models and planimetric feature layouts to our clients. By collecting information with a technician in an office rather than being collected by a land surveyor in the field, aerial photogrammetry can provide more quick, safe, and cost-effective solution for large and/or hazardous project areas than using traditional land surveying methods.

Close-Range Photogrammetry

Close-range photogrammetry (CRP) involves acquiring imagery with a camera that is flying low, or in the near vicinity of the study area. Any type of camera (metric or non-metric) is capable for use with CRP and can be mounted to a vehicle, such as an Unmanned Aerial System (UAS), attached to a tripod, or even hand-held during acquisition. Triangulation is performed on the resulting overlapping images to create three-dimensional (3-D) environments from which CADD drawings, surface models, spatial models, point clouds and/or digital orthophotos can be created. We are currently perfecting workflows for quick and effective deployment of our UAS systems.

CRP has several indoor and outdoor applications, including measuring and modeling buildings, bridges, and other structures; calculating stockpile quantities; and creating a permanent 3-D record of accident scenes, artwork, and/or archaeological artifacts.

Surface Collection

We have been providing clients with premium aerial mapping and related services for over four decades, and has successfully completed strip and block mapping projects varying in size from a single stereo model to more than 1,000 models using vertical aerial imagery acquired from both aerial film cameras and digital sensors with photo scales ranging from 1”=80’ to 1”=2,500’. Building on a tradition of genuine client relationships, consistent protocols, and personalized services, we always promise excellence in product quality and customer service from the initial planning stage through the entire duration of the project.

Martinez Geospatial’s aerial services include:

    • Flight Mission Planning
    • Ground Control Layout / Survey
    • Image Processing / Dodging
    • Full Analytical Aerotriangulation (FAAT)
    • Orthophotography Production
    • Planimetric / Topographic Mapping
    • Terrain / Surface Modeling
    • Contour Generation
    • Quantity Calculations
    • Airspace Analysis / Obstruction Surface Surveys
    • GIS Attribution and Formatting
    • Land Use / Environmental Change Analysis
    • Expert Witness Testimony
    • Graphics & Visualization Services

    Markets

    Aerial photogrammetry is utilized by both public and private engineers, surveyors, planners, developers, lawyers, archeologists, and scientists for a wide range of analysis, design, and mapping applications.

    Among the various industries serviced by Martinez Geospatial are:

    • Agriculture
    • Airports
    • Cartography & GIS
    • Flood Risk Assessment
    • Forestry
    • Landfills / Mines / Quarries
    • Military Intelligence / Reconnaissance
    • Pipelines
    • Railways (Heavy & Light)
    • Roadways
    • Shoreline Erosion
    • Site Development
    • Transmission / Distribution Lines
    • Wind Farms Services

    Deliverables

    We use aerial and ground-based imagery to create a wide variety of customized two-dimensional (2-D) and three-dimensional (3-D) products in numerous industry-standard formats specially designed to meet the unique requirements of each project. The digital mapping files are compiled to meet the accuracy standards developed by the American Society for Photogrammetry and Remote Sensing (ASPRS), the Federal Geographic Data Committee’s (FGDC) National Standard for Spatial Data Accuracy (NSSDA), and/or United States National Map Accuracy Standards (NMAS).

    Typical aerial mapping deliverables include:

    • 2-D Digital Orthophotography
    • Planimetric / Topographic CADD Drawings
    • Digital Terrain Models (DTM) / Digital Elevation Models (DEM) / Triangulated Irregular Network (TIN) Files
    • GIS Shapefiles
    • Quantity Calculations
    • Land Use / Environmental Change Analysis Reports
    • Legal Exhibits
    • Aerotriangulation Support Files

    Martinez Geospatial

    2915 Waters Road, Suite 100
    Eagan, MN 55121
    Phone: 651-686-8424
    Fax: 651-686-8389