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  2. Quadrangle (geography) - Wikipedia

    en.wikipedia.org/wiki/Quadrangle_(geography)

    From approximately 1947–1992, the USGS produced the 7.5 minute series, with each map covering an area one-quarter of the older 15-minute quad series, which it replaced. [1] A 7.5 minute quadrangle map covers an area of 49 to 70 square miles (130 to 180 km 2 ). [ 2 ]

  3. Digital orthophoto quadrangle - Wikipedia

    en.wikipedia.org/wiki/Digital_orthophoto_quadrangle

    DOQs produced by the USGS cover an area measuring 7.5-minutes longitude by 7.5-minutes latitude (the same area covered by a USGS 1:24,000-scale topographic map, also known as a 7.5-minute quadrangle) or 3.75-minutes by 3.75-minutes.

  4. List of GIS data sources - Wikipedia

    en.wikipedia.org/wiki/List_of_GIS_data_sources

    This is a list of GIS data sources (including some geoportals) that provide information sets that can be used in geographic information systems (GIS) and spatial databases for purposes of geospatial analysis and cartographic mapping. This list categorizes the sources of interest.

  5. The National Map - Wikipedia

    en.wikipedia.org/wiki/The_National_Map

    The National Map is a significant contribution to the U.S. National Spatial Data Infrastructure (NSDI) from the Federal Geographic Data Committee (FGDC) and currently is being transformed to better serve the geospatial community by providing high quality, integrated geospatial data and improved products and services including new generation ...

  6. National mapping agency - Wikipedia

    en.wikipedia.org/wiki/National_mapping_agency

    Topographic sheets at 1:25,000 scale covering 7.5 minutes latitude and longitude map the densely populatedTerai and Middle Mountain regions. Less populated high mountain regions are on 15-minute sheets at 1:50,000. JPG scans can be downloaded. [35] Currently, Survey Department is updating it's topographical base map using ZY-3 imagery.

  7. Topographic map - Wikipedia

    en.wikipedia.org/wiki/Topographic_map

    These signs are usually explained in the margin of the map, or on a separately published characteristic sheet. [17] [18] [19] Topographic maps are also commonly called contour maps or topo maps. In the United States, where the primary national series is organized by a strict 7.5-minute grid, they are often called or quads or quadrangles.

  8. Cleveland Heights, Ohio - Wikipedia

    en.wikipedia.org/wiki/Cleveland_Heights,_Ohio

    Cleveland Heights is located at (41.509652, -81.563301 [23]According to the United States Census Bureau, the city has a total area of 8.13 square miles (21.06 km 2), of which 8.11 square miles (21.00 km 2) is land and 0.02 square miles (0.05 km 2) is water. [24]

  9. Sea level - Wikipedia

    en.wikipedia.org/wiki/Sea_level

    Sea level measurements from 23 long tide gauge records in geologically stable environments show a rise of around 200 millimetres (7.9 in) during the 20th century (2 mm/year).

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