WELCOME

Denny Sauers, Jr, CP

Bill Faunce, CP

LOCATIONS

PO Box 535

Lake Odessa, MI 48849

616-902-0516 T

Dsauersjr@aerocon.com

4515 Glenbrook Road

Willoughby, Ohio 44094

800-717-1342 T

440- 946-2646 F

www.aerocon.com

PHOTOGRAMMETRY“Photogrammetry is the art, science, and technology of obtaining reliable

information about physical objects and the environment through the

processes of recording, measuring, and interpreting photographic

images. (ASPRS)

Historical Photogrammetry

Talbert Abrams – The Father of

Photogrammetry MSU Abrams Planetarium

Abrams Explorer AircraftPhoto Mosaic

Analog Stereoplotter WILD A-7 Stereoplotter

Pre and Post Photography

Pearl Harbor

Photo Interpretation GuadalcanalPhoto Interpretation Lab

Statue of Liberty

Niagara Falls

Jacobs Field constructionPROJECT PLANNING

Project Type

Accuracy

Feature Detail

Contour Interval

Mapping Limits

Customizable to YOUR Layers and Symbols

Map Scale Planimetric Accuracy for Well-Defined Points limiting RMSE (feet)

ASPRS Class 1 NMAS ASPRS Class 2

1"=20’ 0.2 0.30 0.4

1”=50' 0.5 0.75 1.0

1"=100' 1.0 1.5 2.0

1"=200' 2. 3.0 4.0

1"=400' 4.0 6.0 8.0

1"=800' 8.0 12.0 16.0

Target Scale” = x ft. ASPRS Class 1 NMAS ASPRS Class 2

50 1"=350' 1"=375' 1"=400'

100 1"=700' 1"=750' 1"=800'

200 1"=1,400' 1"=1,500' 1"=1,600'

400 1"=2,800' 1"=3,000' 1"=3,200'

Horizontal Accuracy TableTopographic Elevation Accuracy Requirements

For Well-Defined Points

ASPRS Limiting RMSE (ft)

Target

Contour

Interval

Breaklines/Contours Spot or DTM Elevation Points

ft. ASPRS Class 1 NMAS ASPRS Class 2 ASPRS Class 1 NMAS ASPRS Class 2

0.5 0.17 0.25 0.33 0.08 0.12 0.16

1 0.33 0.495 0.66 0.17 0.25 0.33

2 0.67 1.0 1.33 0.33 0.5 0.67

5 1.67 2.5 3.33 0.83 1.25 1.67

Target

Contour

Interval

ASPRS Class 1 NMAS ASPRS Class 2

½ 1"=167' 1"=175' 1"=183'

1 1"=333' 1"=350' 1"=367'

2 1"=667' 1"=700' 1"=733'

4 1"=1,333' 1"=1,400' 1"=1,467'

Vertical Accuracy Table

Phases to the Mapping Process

Flight Planning / Aerial Photography

Ground Control Survey

Aerial Triangulation / Stereomodel Setup

Stereomodel Digitizing

Cartographic Editing

Digital Orthophotography

AERIAL PHOTOGRAPHY

CAMERA SYSTEM

FILM

DIGITAL

ABGPS

AERIAL PHOTOGRAPHY

Clear skies

30 degree sun angle

Leaf-off vegetation

No snow cover

Nov. – Apr. Acquisition

Cloudless DaysClear Skies

Partly Cloudy Cloudy Skies

Leaf off conditions 30 Degree Sun Angle

Low Sun Angle Shadows Trace of snow

Snow in the ditches Tall grass

Grass flattened by snowGROUND CONTROL

Accurate, well placed ground control is an essential

element for photogrammetric projects.

Two standard types of ground control points

Photo Identifiable Points

Pre-marked Targets/Panels

Advantages / Disadvantages

TARGETED GROUND CONTROLTARGETED GROUND CONTROL

PHOTO ID GROUND CONTROL ANALYTICAL TRIANGULATION

SETUP & MEASURE CONTROL Corridor Mapping Control Plan

Feature

Collection

Digital Planimetric Mapping

Mass Points1”=50’ – 25’ GRID

1”=100’ – 50 ‘ GRID

Auto Correlation

Breaklines

Contours

Spot Height Elevations

DTM/DEM Surface Generation

Customized to Client CAD Standards

& Software Formats

Cartographic Edit / QA QC

Digital Imagery, Aerial Triangulation, DEM/DTM

Digital Orthophotography

Orthophoto Draped Over TINImage plotting

Types of projects that use

Photogrammetry

Engineering/Design

Strip mapping for sewer/roads

Stockpiles/Volumes

Landfills Golf course design/development

Industrial site mapping Colleges/Universities

Colleges/Universities Airports

Windfarms Planning

Mobile LiDAR

THANK YOU

THE END