Capabilities Statement

Principal & credential

Steve Dillon · Principal

Steve Dillon · ASPRS Certified Photogrammetrist since 1989, Certificate #790 · 34 years of experience

Caltrans digital mapping project manager; helped develop digital orthophotography standards; city-wide GIS/LIS mapping.

Core services

• Photogrammetric Mapping
• Digital Orthophotography
• Aerial Photography (B&W, Color & Infrared)
• Aerial Triangulation
• DTM & DEM
• LiDAR Data
• GIS & LIS Mapping
• Historical Aerial Photo Archive (1965–present)
• Precision Photogrammetric Scanning
• Consulting & Wide-Format Plotting

Equipment

• Wild RC30 aerial camera with image motion compensation
• Versamat film processor
• Wehrli precision photogrammetric scanner
• Leica/KLT softcopy stereo instruments

Firm memberships

• California Land Surveyors Association (CLSA)
• American Society for Photogrammetry and Remote Sensing (ASPRS)

Quality control

Flight plans follow map scale and contour specifications, using field control supplied by the client’s surveyor. Photography is checked for overlap, sidelap, tip and tilt; film is processed and precision-scanned. Independent QC review of every stereo model checks completeness and accuracy. A CAD editor consolidates the master DTM and separate planimetrics; contours come from the DTM and final CAD is reviewed in stereo. Orthophotos from the final DTM are checked with a planimetric overlay. Products meet or exceed National Map Accuracy Standards; accuracy is specified per project.