ORTHOPHOTOGRAPHY
What is orthophotography?
Orthophotography is a photo-quality digital image of surface features in their geometrically corrected, true map projection. The orthorectification process ties each pixel in a digital image to its true Earth location. An aerial photograph differs from an orthophoto because it lacks these qualities. Listed below are the different orthophoto layers available on the Jo Daviess County GIS Online Mapping Site.
NAME IN LEGEND IMAGERY
ACQUIRED BY
DATE OF
ACQUISITION
PIXEL
RESOLUTION
MAPPING SCALE
METADATA
Ortho 2011 (NAIP)
USDA/FSA as part of the National Agriculture Imagery Program
(NAIP)
August 13 & 14, 2011
1 meter
1" = 1,000'
Metadata
Ortho 2011 Color
Jo Daviess County Government
April 13, 2011
6 inch
1" = 100'
Metadata
Ortho 2010 (NAIP)
USDA/FSA as part of the National Agriculture Imagery Program
(NAIP)
June 28, 2010
1 meter
1" = 1,000'
Metadata
Ortho 2009 (NAIP)
USDA/FSA as part of the National Agriculture Imagery Program
(NAIP)
July & August, 2009
1 meter
1" = 1,000'
Metadata
Ortho 2006 (Towns/Development)
Jo Daviess County Government
April 10, 2006
6 inch
1" = 100'
Metadata
Ortho 2006 Color
Jo Daviess County Government
April 10, 2006
1 foot
1" = 400'
Metadata
Ortho 2006 Black-White
Jo Daviess County Government
April 10, 2006
1 foot
1" = 400'
Metadata
Ortho 2006 Northern Carroll Co.
Carroll County Government
April 10, 2006
1 foot
1" = 400'
Metadata
Ortho 2005 (NAPP)
Illinois National Aerial Photography Program (NAPP)
May 2005
1.5 foot
1" = 1,000'
Metadata
Ortho 2002 (Towns/Development)
Jo Daviess County Government
March 27, 2002
6 inch
1" = 100'
Metadata
Ortho 2002 Black-White
Jo Daviess County Government
March 27, 2002
1 foot
1" = 400'
Metadata
Ortho 1998-99 (NAPP)
Illinois National Aerial Photography Program (NAPP)
Summers of 1998 & 1999
1 meter
1" = 1,000'
Metadata
Ortho 1988 (NAPP)
Jo Daviess County Government & USDA/FSA as part of the
National Aerial Photography Program (NAPP)
April 1988
2 meter
1" = 1,000'
Metadata
RETURN TO DATA LAYERS PAGE
