A Digital Ortho Quarter Quad (DOQQs) is a digital image which has the properties of an orthographic projection. It is derived from a digitized perspective aerial photograph by differential rectification so that image displacements caused by camera tilt and relief of terrain are removed.
Our DOQQs are organized by county and have been compressed with Mr.Sid at a 10:1 ratio. There are two files associated with each quarter quad (.sid, .sdw). Make sure to download both files.
These files were produced by USGS and provided by NRCS. For metadata information For fly date information, click on the .jpg file in the county doqq directory.
** Currently we only have UTM doqqs available in merged county sets. We hope to have individual quarter quads available soon. If you do not wish to download the large county mosaics, see the geographic doqs below.**
Tennessee Base Map Imagery
The raw .TIF digital orthophotos and digital terrain models (DTMs) developed from the Tennessee Basemapping Program are available for sale on a per sheet basis. More details about the nature, format and cost of the data can be found here
The digital orthophotos from the Tennessee Basemapping program are available in the MrSID file format on a per-county basis and can befreely downloaded here.
NATIONAL AGRICULTURE IMAGERY PROGRAM (NAIP)
NAIP is administered by the USDA's Farm Service Agency (FSA) through the Aerial Photography Field Office in Salt Lake City. This "leaf-on" imagery is used as a base layer for GIS programs in FSA's County Service Centers, and is used to maintain the Common Land Unit (CLU) boundaries.
NAIP UTM 2007
NAIP State PLane 2007
NAIP UTM 2012
NAIP State Plane 2012