2016 Purdue Road School
Introduction to Orthophotography
Jim Stout
GIS Consultant
39 Degrees North,
LLC
[email protected]
Orthos
Example of
an
orthophoto
tile:
5,000 feet
by
5,000 feet
1-foot pixel
resolution.
Leaf-Off
Introduction to Orthophotography
Orthophotography Product
Natural Color Orthophotography
(1-foot)
Color-Infrared Orthophotography
(1-foot)
Introduction to Orthophotography
What is an Orthophotograph?
Definition:
A digital (electronic) aerial photograph
that has been modified to remove
distortion from the camera & airplane
and adjusted to fit the ground surface.
It is a photo that can be used as
a MAP
Introduction to Orthophotography
Cameras Distort Images
All imagery
has
spatial error
due
to the
distorting
nature of
photography.
&
• Parcels
• Buildings
• Pavement
• Railroad
• Streams
Introduction to Orthophotography
Orthophoto Uses
Orthophotography has the geometric
characteristics of a map and the image
qualities of a photograph. These qualities
allow for:
• distance measurements
• area calculations
• determination of feature shape
• direction calculations
• determination of coordinates at a location
Introduction to Orthophotography
Camera: Leica ADS (Airborne Digital
Sensor)
Introduction to Orthophotography
Camera: Leica ADS (Airborne Digital
Sensor)
12 sensors
Introduction to Orthophotography
Camera: Leica ADS (Airborne Digital
Sensor)
Introduction to Orthophotography
Coordinate Systems
• Indiana
East & West
State Plane (feet)
• NAD83, NAVD88
-- or --
• UTM Zone 16
(meters)
• Latitude / Longitude
(degrees)
Introduction to Orthophotography
Indiana Ortho & LiDAR Program
Indiana Ortho & LiDAR Program
Introduction to Orthophotography
• 12” resolution
Introduction to Orthophotography
• 6” Resolution
Introduction to Orthophotography
• 3” Resolution
Introduction to Orthophotography
• Impervious Surface Mapping
Introduction to Orthophotography
• Oblique Imagery
Introduction to Orthophotography
Questions & Comments
Jim Stout
GIS Consultant
39 Degrees North,
LLC
[email protected]