Land Boundary Information System
Mapping Data
DOQQ
Albers MrSID
Digital Orthographic Quarter-Quads
1995 Albers - HPGN - MrSID
You are about to enter an FTP site. The folders are organized by county and the
files are identified by DEP quad numbers.
Enter FTP Site
About the Data
Check the Fly Dates to see
when a photograph was taken.
| Projection: | | Albers |
| Datum: | | HPGN (NAD83) |
| Units: | | Meters |
| 1st standard parallel: | | 24 00 00 |
| 2nd standard parallel: | | 31 30 00 |
| Central Meridian: | | -84 00 00 |
| Latitude of projection's origin: | | 24 00 00 |
| False easting (meters): | | 400000.0 |
| False northing (meters): | | 0.0 |
| Graphics Type: | | MrSID |
| World File: | | SDW |
| Resolution: | | 1-Meter |
The files are in MrSID format. MrSID is a proprietary file format that compresses large images to a fraction of their original file
size without quality loss.
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Determining the File Name
Use the Quad Name Locator to find the
DEP quad number.
The file names begin with "Q", followed by the DEP quad number, followed by "NW", "NE", "SW", or "SE" to indicate quarter-quad position within the quad.
A "1" follows to indicate 1-meter resolution.
Each MrSID quad has up to 5 image files: one for each quarter-quad and one containing a mosaic of the individual pieces.
Downloading Instructions
FTP
is recommended for large downloads.
These images are available on CD, DVD, or portable hard drive for a fee.
Special Software Needed
GIS software that can read a MrSID file is recommended. Be sure to download the SDW file and place it in the same directory as the SID.
ESRI's ArcView supports MrSID format (be sure to turn the extension on).
The
MrSID Viewer and
MrSID GeoExpress View
are stand-alone applications designed to optimize the viewing of imagery
that is in the MrSID imaging format.
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