BLM and USGS 2003 vector digital data Portland, Oregon OR BLM 1:250,000 quadrangles for Oregon and Washington as defined in North American Datum 1927 (NAD27). These quads show the approximate extent of and align with the NAD27 corner ticks as displayed on USGS Topoquads. Resource Management Planning BLM (Bureau of Land Management), USGS (United States Geological Survey), GNIS (Geographical Names Information System), NGNDB (National Geographic Names DataBase) As described in the process steps these data were created on a regular grid of latitude/longitude to depict the 1:250,000 quadrangles covering Oregon and Washington and the surrounding areas as defined in North American Datum 1927 (NAD27). Due to the fact the dataset was originally created in NAD27 the values of coordinates defining the corners of the quads will only be those of the definition in the original datum. Once data is projected to a different datum the values will be correctly modified mathematically to reflect the change to the new projection. These quads show the approximate extent of the USGS topographic quadrangles. Since this data is constructed from corner points with straight lines connecting the corners, it does not take into account the curve between corner points introduced by the use of the UTM projection used to produce the topoquad maps. Thus this dataset is only a depiction of the extent of the topoquad. The corners of each of these quadrangles should align with the NAD27 ticks displayed on USGS topoquads in any projection used. 2002 unknown publication date Complete Unknown -125 -116 49 41 None Base Data Lands Quadrangles index ISO 19115 imageryBaseMapsEarthCover None Oregon Washington Discretionary, contains no sensitive information - generally considered releasable. None. Mary Hartel Bureau of Land Management, OR/WA State Office Chief - Branch of Geographic Sciences mailing address

P.O. Box 2965

Portland OR 97208 USA (503) 808-6131 503-808-6190 mhartel@blm.gov 8am - 5pm Arc/Info, AIX/UNIX The Ohio codes were generated based on the latitude/longitude of the SE corner of each polygon. The common names were attributed by relating a GNIS database to the Ohio codes. The Q250 Ohio codes were generated based on the latitude/longitude of the SE corner of the 250K quad. The results were visually checked for accuracy. This theme was created by generating the lines at a 1 degree by 2 degree interval. There are no node errors or open polygons. This theme was built with polygon topology. The original defined datum is NAD27. This theme covers all lands in Oregon and Washington as well as parts of California, Nevada, Idaho, British Columbia, Alberta and the Pacific Ocean. Unknown Unknown USGS 199405 paper unknown unknown unknown publication date USGS Map Name Attributes USGS 199803 Unknown Unknown Unknown publication date USGS NGNDB Attributes This coverage was generated in Arc/Info using a computer program that created the polygons at 1 by 2 degree intervals of latitude and longitude respectively. Another computer program used the latitude/longitude of the SE corner of the polygons to calculate their Ohio codes. The GNIS NGNDB was related to the Ohio codes to populate the common names field. GNIS NGNDB was compared to a USGS file. 200109 0 None Vector G-polygon 45 0.000000001 0.000000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 1x2-degree Quad Polygons Polygons at intervals of 1x2-degree of latitude and longitude BLM objectid Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. q250 The USGS Ohio code for the 250K (1 degree X .5 degree) quad. BLM 250K Ohio code for the quad; for example, E145120 (in which the 45 is the latitude, 120 the longitude of the southeast corner of a one degree by one degree block; 'E' refers to the fifth 7.5' row and '1' refers to the first column in a 1 degree x 1 degree quad, as measured from the southeast corner). All 250K Ohio codes begin with either 'A1' or 'E1', as this is derived from the 7.5-minute quad located in the southeast corner of the 250K quad. shape Feature geometry. ESRI Coordinates defining the features. The format of the quad code, in attribute q250, is translated from the format typically provided by USGS. Translation is required for use in many database programs (e.g. Informix, Oracle) because often, when dealing with a character field, the database program will not accept a numeral in the first space. -------------------------------------------------------------------------------- Eric Hiebenthal Bureau of Land Management/Northrop Grumman Data Administration Supervisor mailing address

P.O. Box 2965

Portland OR 97208 USA 503-808-6565 503-808-6374 ehiebent@blm.gov 7:30 a.m. to 4:00 p.m. Downloadable Data No warranty is made by the Bureau of Land Management as to the accuracy, reliability, or completeness of these data for individual use or aggregate use with other data. Contact distributor. Data are only available through the Oregon/Washington State office of the Bureau of Land Management. 20030106 20060427 20040106 Stanley Frazier Bureau of Land Management, Oregon State Office State Data Administrator mailing address

P.O. Box 2965

Portland OR 97208 USA (503)808-6009 (503)808-6419 sfrazier@blm.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time