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 2012 (NAIP) USDA/FSA as part of the National Agriculture Imagery Program (NAIP) August 8, 2012 1 meter 1" = 1,000' 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