These T-Sheet was collected from the NOAA National Ocean Service (NOS). The imagery was originally obtained as GeoJPEGs.
GeoJPEG - These are JPEG images with an associated world file (.jgw) holding georeferencing information and a metadata file.. These are intended for use in a GIS. These files are zipped for download purposes.
JPEG images are files between 1 to 5 MB. The quality of these images have been reduced in Photoshop to "high 80" to meet an array of public needs and bandwidth demands.
For more information, please refer to the metadata file.