About Map Images
All maps digitized for the American Shores - Maps of the Middle Atlantic Region to 1850 project were scanned on two types of camera at The New York Public Library: the Leica S1 Pro and the PhaseOne PowerPhase FX. All maps were captured with a resolution of at least 300 dpi (dots per inch). The resulting TIFF files are very large, from 60 to 100 megabytes in size. Files of this size are difficult to serve over the Web. Therefore, the Digital Library Program of The New York Public Library has created a set of web-ready derivatives in GIF and JPG formats that are more easily accessed over the Web.
The JPG files on this site have a resolution of 72 dpi, which is the resolution at which most computer monitors display. Because maps can have such acute detail, which may not fully display in a smaller JPG file, the Digital Library Program has also encoded images in the SID (Multi-resolution Seamless Image Database) file format. When viewed with MrSID software, these wavelet-based files allow one to see the fineness of detail that is stored in the large, uncompressed TIFFs. To order copies of the high-resolution TIFF files, note the Image ID Number for each image to be ordered and contact Photographic Services & Permissions. Please allow time for order processing.
As part of its public service mission, The New York Public Library reproduces items from its collections in a range of formats including various size b/w and color prints, digital scans on CD, 35mm slides, and color transparencies for personal or research use only. You must apply to The Library for permission to use reproductions for all other uses including, but not limited to, commercial or scholarly publication, exhibition, commercial or public television broadcast, home video/DVD, non-broadcast documentaries, online/Web sites and promotion, which are all subject to a use fee. Please note that in most cases The Library only holds the physical rights to the images in its collections and it is up to the patron to clear copyright.