|
|
|
|
|
|
County
Boundaries
|
Digital Ortho Quarter Quads (DOQQs)
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.**
This set are quarter quads that have been merged into complete quad coverages. Note the projection change.
|
