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The maps are usually named after local physiographic features. The shorthand "quad" is also used, especially with the name of the map; for example, "the Ranger Creek, Texas quad". A quadrangle is defined by north and south boundaries of constant latitude (which are not great circles so are curved), and by east and west boundaries of constant ...
A topographic survey is typically based upon a systematic observation and published as a map series, made up of two or more map sheets that combine to form the whole map. A topographic map series uses a common specification that includes the range of cartographic symbols employed, as well as a standard geodetic framework that defines the map ...
The Quad [3] [4] is a grouping of Australia, India, Japan, and the United States that is maintained by talks between member countries. The grouping follows the "Tsunami Core Group" and its "new type of diplomacy" developed in response to the 2004 Indian Ocean earthquake and tsunami. [5]
A digital orthophoto quadrangle [1] (DOQ) is aerial photography or satellite imagery that has been corrected so that its pixels are aligned with longitude and latitude lines, and have a narrowly defined region of coverage.
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 ...
The polygonal map quadtree (or PM Quadtree) is a variation of quadtree which is used to store collections of polygons that may be degenerate (meaning that they have isolated vertices or edges). [ 9 ] [ 10 ] A big difference between PM quadtrees and edge quadtrees is that the cell under consideration is not subdivided if the segments meet at a ...
What is the quad-demic? Although the trifecta of flu, COVID-19 and respiratory syncytial virus (RSV) are commonly paired, norovirus outbreaks around the U.S. have added to concerns of a quad-demic.
A quad chart is a form of technical documentation used to briefly describe an invention or other innovation through writing, illustration and/or photographs. [1] Such documents are described as "quad" charts because they are divided into four quadrants laid out on a landscape perspective.