BLM and USGS 1999 vector digital data Portland, OR OR BLM This theme depicts the 1:24,000 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 1:24,000 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. 1999 unknown publication date Complete Unknown -125 -116 49.5 41.5 None Base Data Lands Quadrangles quads24_poly ISO 19115 boundaries 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 (503) 808-6131 503-808-6190 mhartel@blm.gov Arc/Info, AIX/UNIX The Ohio codes were generated based on the latitude/longitude of the SE corner of the polygon, while the alternative Ohio codes were calculated from the original, moving the first two characters to the end of the string. The common names were attributed by relating a GNIS database to the Ohio codes. The alternative common names were attributed by relating a USGS database to the Ohio codes, using only those names that did not match the original common names. The Q100 Ohio codes were generated based on the latitude/longitude of the SE corner of the 100K quad that the 7.5-minute quad fell in. The results were visually checked for accuracy. This theme was created by generating the lines at a .125 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 BLM 1999 24000 online 1999 unknown publication date BLM QUADS24 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 The source coverage was generated in Arc/Info using a computer program that created the polygons at 7.5-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 Ohio codes were then translated to alternate Ohio codes by moving the first two characters in the string to the end of the string. The GNIS NGNDB was related to the Ohio codes to populate the common names field. GNIS NGNDB was compared to a USGS file, and where quad names disagreed, the name from the USGS file populated the alternate name field. The Q100 Ohio code field was populated from the Ohio code of the 7.5-minute quad in the SE corner of each 100K quad. 199909 000000 Eric Hiebenthal ORSO BLM/Titan Systems GIS Data Specialist mailing address

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Portland OR 97208 USA 503-808-6565 ehiebent@blm.gov Data was reprojected to Geographic NAD83 and loaded into the BLM corporate SDE instances as a stand alone feature class. quads24 2005 quads24_poly Northrop Grumman Bryant Mecklem SDE Administrator mailing address

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Portland OR 97208 USA (503) 808-6506 bmecklem@blm.gov 0 Oregon Washington Vector G-polygon 4657 0.000000001 0.000000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 1980 6378137.000000 298.257222 7.5-minute Quad Polygons Polygons at intervals of 7.5 minutes of latitude and longitude BLM objectid Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. alt_ohiocode The USGS Ohio code for the 24k (7.5-minute) quad, with the row/column coding listed last. BLM Ohio Code for the quad, with the row/column coding listed last; for example, 44117A2 (in which the 44 is the latitude, 117 the longitude of the SE corner of a one degree by one degree block; 'A" refers to the first 7.5' row and '2' refers to the second 7.5' column, as measured from the SE corner. name The name of the 24k quad. BLM A name up to 30 characters long. This will be the most current name given to a 24k quad, as determined by a query of the GNIS database. ohiocode The USGS Ohio code for the 24k (7.5-minute) quad, with the row/column coding listed first. BLM Ohio Code for the quad, with the row/column coding listed first; for example, A244117 (in which the 44 is the latitude, 117 the longitude of the southeast corner of a one degree by one degree block; 'A' refers to the first 7.5' row and '2' refers to the second 7.5' column, as measured from the southeast corner). old_name The alternative name of the 24K quad, usually the old name of a quad that has been renamed. BLM A name up to 30 characters long. A value will only be present if there is a known previous name or alternative name for the quad and that name can be verified with the USGS. q100 The USGS Ohio code for the 100K (1 degree X .5 degree) quad. BLM 100K 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 100K 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 100K quad. shape Feature geometry. ESRI Coordinates defining the features. There are two attributes and descriptions, for the most part identical, of the Ohio code of a quad. The second attribute (ALT_OHIOCODE) is in the format provided by USGS. Translation to the format used in the first attribute (OHIOCODE) was 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 503-808-6565 503-808-6374 ehiebent@blm.gov 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. 20051122 20080205 Stanley Frazier Bureau of Land Management, Oregon State Office State Data Administrator mailing address

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