BLM and USGS 2002 vector digital data This theme shows the 1: 63,360 quadrangles (30 Minute Quads) 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 1:63,360 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 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

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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 the polygon. The common names were attributed from one of four sources if the quad covered some portion of Oregon. From an existing, or once used, USGS Map name. From an existing, or once used, BLM map name. For the 100k map that covers the same area. For the 7.5 minute map that covers the same area. Source for the map name is noted in the SOURCE attribute. This theme was created by generating the lines at a .500 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. Only quads covering Oregon are attributed with common names. Unknown Unknown BLM 2002 computer program 2002 unknown publication date BLM QUADS30m Lines USGS 199405 24000 paper Unknown Unknown 199405 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 30-minute intervals of latitude and longitude. 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 maps, and where quad names disagreed, the name from the USGS map populated the name field. The BLM archives were search for 30-minute series maps. Where they found the name of those maps, they were used to populate the name field. Where no USGS or BLM map was found, names of the 100k USGS map series were use to populate a quad name. When two quads required names only the quad that covered the feature for which the 100k map was named by was named using that name. For those remaining the name of one 7.5 Minute map within the polygon boundary was use to populate the name field. 200004 000000 0 Oregon Washington Vector G-polygon 324 0.000000001 0.000000001 Decimal degrees North American Datum of 1927 Clarke 1866 6378206 294.9786982 30-Minute Quad Polygons Polygons at intervals of 30 Minutes of latitude and longitude BLM objectid Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. q30 The USGS Ohio code for the 30-minute quad, with the row/column coding listed first. BLM name_ A name up to 30 characters long. This will be the most current name given to a 30M quad, as determined by the source of the name. BLM source source of the name for the quad. 100K 100k Name used Name from nearest USGS 100k map used 15M 15M Name used Name from nearest 15M USGS map used 7.5M 7.5M Name used Name from nearest 7.5M USGS mape used Null No Name used No name assigned Existing Existing Name used Name from existing 30M map used shape Feature geometry. ESRI Coordinates defining the features. The format of the quad code, in attribute q30, 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

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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. 20030101 20080206 Stanley Frazier Bureau of Land Management, Oregon State Office State Data Administrator mailing address

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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