From: Sam Wormley Newsgroups: sci.geo.satellite-nav Subject: USGS: DRGs On-Line (It's a beginning) Date: 9 Sep 1998 19:33:27 GMT Organization: Iowa State University Message-ID: <6t6l67$v2o$3@news.iastate.edu> Ref: ftp://ftp.emtc.usgs.gov/pub/gis_data/ ftp://ftp.emtc.usgs.gov/pub/gis_data/drg_data/ 11/27/96 ftp.emtc.nbs.gov:/pub/gis_data directory structure Please read the index files in the directories. |-100k_sections-----------------|-a--|-ada_mn | |-. |-. |-aerial_photos-umrs-|-alton |-. |-. gis_data-| |-. |-. |-. | |-. |-y |-ava_mo | |-. | |-starved_rock | |-graphics--|-example_gifs | |-map_products---|--umrs |-metadata |--msp_atlas | |-umrs_floodplain--|-alton | |-. |-gps_basestation |-. |-. |-starved_rock 100k_sections: 100k_sections contains GIS data tiled to either 1:100,000-scale or 1:24,000-scale USGS quadrangle boundaries. Types of data contained within these directories are, USGS DLG data, scanned and rectified USGS quadrangle images, and Landsat Thematic Mapper data. aerial_photos: Aerial_photos contains scanned images of 1994 1:15,000-scale color infrared aerial photographs of the Upper Mississippi River System's floodplain. graphics: Graphics contains two types of data, example .GIF images, and map products. The example .GIF images are used by the EMTC Web site to provide users with an idea of what the various data sets look like. The map_products directory currently contains images, ARC/INFO graphic files (.GRA), and acrobat reader files (.PDF) for selected EMTC map products. metadata: Metadata contains the individual coverage's metadata files. umrs_floodplain: UMRS_floodplain contains GIS data files created for Upper Mississippi River System. Most of the coverages contained within this directory do not contain data for outside the river's floodplain. Types of data contained within this directory are, land cover/land use data, aquatic areas, bathymetric data, navigation structures, and habitat data. Note: Some of the files are compressed using the GNU compression utility "gzip". You will need the GNU utility to uncompress them. The gzip utilities are available via anonymous ftp from prep.ai.mit.edu:/pub/gnu. Files with the .gz extension are double precision coverages, compressed with the gzip utility. Files with the .exe extension are single precisions coverages, compressed with a PC-based self extracting pkzip utility.