This page is intended to help users with DOQQ CDs. Originally, 26 counties were delivered on CD with the images, header files, and documentation in a specific format. The rest of the 74 counties were delivered on CD with changes to the header file and documentation formats. Additional "world files" have also been included on these revised-format CDs, which make their use with some geographic information systems (GIS) simpler. The map below shows which counties were produced in original- or revised-format CDs. A text list of counties showing which CD format can be viewed here. A comparison of the original CD format and the revised CD format is available here.
![[Click on map for list of counties]](doqform.gif)