Orthoimagery

Instructions for downloading from The National Map Viewer are located in a Download and Cart user guide. Orthoimagery is downloaded with the following steps:
Formats available for download of orthoimagery are compressed 10:1, JPEG2000 for NAIP products, and compressed 5:1, JPEG2000 for high resolution orthoimagery (HRO).
Orthoimagery data is offered through our Bulk Data distribution site.
If you click on the orthoimagery product added to the Cart, dashed red bounding boxes will draw on the map indicating the extent of the selected product, which are separated into a maximum number of "chunks."  The amount of imagery data that can be dow
Because orthoimagery can be quite large in size, we currently provide a way to break the file delivered to the user into "chunks" that can be reasonably transported over the Internet.  The maximum file size limit is 1.5 GB per order.  High resolution o
A metadata link is available for each imagery product listed in the USGS Available Data dialog when the Download Data tool is used. FGDC metadata is included in the download archive package for the product.
General information can be found on the USGS Orthoimagery website. More specific status information, such as year and data availability, is found at 
Imagery services were created using the NASA Blue Marble Next Generation (BMNG) product for the smallest scales ranging from a world view to 1:2.3M, and a subset of the Global Land Survey 2000 (Landsat) product for remaining small scales ranging from 1
There are several available imagery services. USGSImageryOnly is a cached (pre-generated tiles) map service from world scale to 1:18K with several imagery sourc
The USGS Imagery Only service is cached using tiles of 256x256 pixels in tile size, and 96 DPI resolution with 75% compression quality. A cached service is one that has been broken down into static tiles, or pre-generated images.