BLM and USGS20030101BLM OR Quads 1:250,000 Polygonvector digital dataPortland, OregonOR BLMQuads250khttp://www.blm.gov/or/gis/data.phpQUADS250_POLY: 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 PlanningBLM (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.20020101publication dateUnknown-125-1164941ISO 19115imageryBaseMapsEarthCoverBLMManagementNoneBase DataQuadranglesLandsindexBLM-StateWashingtonOregonPUBLIC DATA: None, these data are considered public domain.These data are provided by Bureau of Land Management (BLM) “as is” and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User’s intended use. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived, and both scale and accuracy may vary across the data set. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated with these data. These data are neither legal documents nor land surveys, and must not be used as such. Official records may be referenced at most BLM offices. Please report any errors in the data to the BLM office from which it was obtained. The BLM should be cited as the data source in any products derived from these data. Any Users wishing to modify the data should describe the types of modifications they have performed. The User should not misrepresent the data, nor imply that changes made were approved or endorsed by BLM. This data may be updated by the BLM without notification.Bureau of Land ManagementCorey PlankLead Cartographermailing
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PortlandOR97201US(503) firstname.lastname@example.orgArc/Info, AIX/UNIXThe 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.UnknownUnknownUSGS19980301National Geographic Names DataBaseNoneUSGS NGNDBAttributesUSGS19940501USGS 250K QuadrangleshardcopyPaperUSGS Map NameAttributesThis 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.20010901NoneVectorGT-polygon composed of chains451x2-degree Quad PolygonsPolygons at intervals of 1x2-degree of latitude and longitudeBLMobjectidInternal feature number.ESRISequential unique whole numbers that are automatically generated.q250The USGS Ohio code for the 250K (1 degree X .5 degree) quad.BLM250K 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.shapeFeature geometry.ESRICoordinates defining the features.SHAPE_LengthLength of feature in internal units.ESRIPositive real numbers that are automatically generated.SHAPE_AreaArea of feature in internal units squared.ESRIPositive real numbers that are automatically generated.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.
--------------------------------------------------------------------------------Bureau of Land ManagementEric HiebenthalGIS Data Management Specialistmailing
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PortlandOR97208US503email@example.com instructionsDownloadable DataThe BLM assumes no responsibility for errors or omissions. No warranty is made by the BLM as to the accuracy, reliability, or completeness of these data for individual use or aggregate use with other data; nor shall the act of distribution to contractors, partners, or beyond, constitute any such warranty for individual or aggregate data use with other data. Although these data have been processed successfully on computers of BLM, no warranty, expressed or implied, is made by BLM regarding the use of these data on any other system, or for general or scientific purposes, nor does the fact of distribution constitute or imply any such warranty. In no event shall the BLM have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of the use or reliance on the geographic data or arising out of the delivery, installation, operation, or support by BLM.Contact distributor.Data are only available through the Oregon/Washington State office of the Bureau of Land Management.2003010620141114Bureau of Land Management, Oregon State OfficeRoger MillsGIS Specialistmailing
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PortlandOR97208US(503) 808-6340tdd/tty phone(503) firstname.lastname@example.org:00-4:00NoneFGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998local time