quadrangle (quad) : Typically refers to a map sheet published by the U.S. Geological Survey, a 7.5 minute quadrangle series or the 15 minute quadrangle series. Also known as a topographic or topo map.
About paradigm IT ...
Quadrangle - A standard map size and scale used by the U.S. Geological Survey (TWS).
RS
Raster - Common GIS data model made up of a grid of cells or pixels. Each pixel contains a single value (TWS).
Quadrangle
A four-sided figure, bounded by parallels of latitude and meridians of longitude, used as an area unit in mapping. A well-known map series is the USGS 7.5-minute topographic quadrangle. Each map in this map series covers 7.
quadrangle (quad) maps
A rectangular, or nearly rectangular, area covered by a map. The outline is generally defined by latitude or longitude. Typically refers to USGS topographic maps or to a map sheet published by the U.S. Geological Survey.
Quadrangle - A four-sided region, usually bounded by a pair of meridians and a pair of parallels.
Quality Control - Process of taking steps to ensure the quality of data or operations is in keeping with standards set for the system.
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quadrangle
A quadrangle is a four-sided area bounded by two lines (parallels) of latitude and two lines of longitude (meridians) on a map.
range
A range is a chain of mountains and/or high elevations.
quadrangle (quad) See topographic map. quadtree A spatial index which recursively decomposes a data set (e.g., image) into square cells of different sizes until each cell has a homogeneous value.
5-minute Quadrangle Maps
7.5-minute quads are the most commonly used maps published by the USGS. They cover 7.5 minutes of longitude and latitude and are available for all areas of the United States except for non-urban areas of Alaska.
Within each quadrangle, any point may be located by its distance in meters, east from the central meridian and north from the Equator.
Public land quadrangles (Washington State Dept. of Natural Resources)
PLS
Professional Land Surveyor ...
Each 1� quadrangle is divided into 60� of longitude (numbered eastward from its western meridian) and 60� of latitude (numbered northward from its southern parallel). This direction of numbering is used wherever the 1� quadrangle is located.
The title of the quadrangle is printed in the upper and lower right corners of the map. In addition to the title of the quadrangle itself, the titles of adjacent quadrangles are printed around the edges and at the corners of the map.
USGS topographic quadrangle maps are marked with grid lines and tics around the map collar which make it possible to identify locations on the map by several methods, including the graticule measurements of longitude and latitude, ...
§ Identified on US Quadrangle maps
o Universal Transverse Mercator
§ Transverse (uses longitude as standard line) cylindrical projection ...
8. A "list" of one quadrangle appears. (Other paths to this page may produce lists of more quadrangles.) Select the link to San Francisco North, CA.
Digital orthophoto quadrangles and quarter-quadrangles must meet horizontal National Map Accuracy Standards (NMAS) at 1:24,000 scale and 1:12,000 scale, respectively.
5-minute topographic quadrangle maps. [LINK] This information can be combined and manipulated in a GIS to address planning and natural resource issues.
5-minute quadrangle without over edge. Coverage is for Southwestern Washington up through part of the Puget Sound Basin.
section Unit of subdivision of a township; normally a quadrangle 1 mile square with boundaries conforming to meridians and parallels within established limits, and containing 640 acres as nearly as practicable.
The shape of the ranges also vary from the typical recti-linear ranges to other simplicial objects like triangle, quadrangle, etc., to other objects like circle, sphere, convex objects, simple polygons, complex polygons like polygons with holes, etc.
Later, the USGS used the polyconic projection to create thousands of topographic quadrangles. This projection was used by the USGS until the 1950's. Other agencies began to use the Mercator cylindrical projection in the early twentieth century.
NAPP at 1:40,000-scale, is used for quarter-quadrangle images, while the older NHAP at 1:80,000-scale is used for quadrangle (7.5 minute topographic sheet) coverage.
5- and 15-minute topographic quadrangles include nine thematic categories: (1) boundaries; (2) transportation; (3) hydrography; (4) U.S.
modern systematic use of triangulation networks stems from the work of the Dutch mathematician Willebrord Snell, who in 1615 surveyed the distance from Alkmaar to Bergen-op-Zoom, approximately 70 miles (110 kilometres), using a chain of quadrangles ...
the report of the hearing included a 1:24,000 USGS quadrangle showing the OHWM, and thus the extent of the state's land, defined by the 990 ft contour on the map ...
Sometimes the area you are interested in mapping may not line up exactly with a single USGS quadrangle. In this case You may need to edge match and stitch two or more DEMs to makeone composite DEM.
The US Federal Government has very good information of a level of detail consistent with the 1:25,000 scale USGS Quadrangle maps.
[aerial photography] Acronym for digital orthophoto quadrangle. A computer-generated, uniform-scale image created from an aerial photograph.
Then, using a map (not shown) that plots the mountain ridges between valleys, initially drawn from contours on individual 15 ft topographic quadrangles and then merged into a single regional map, ...
Road network of area covered by the Sugar House quadrangle plotted from USGS digital line graph data, indicating the locations of fire stations and travel times of emergency vehicles.
The polyconic projection was used for most of the earlier USGS topographic quadrangles. The projection is based on an infinite number of cones tangent to an infinite number of parallels. The central meridian is straight.
quarter quad - One-quarter area of a four-sided quadrangle that depicts 7.5 minutes of latitude and 7.5 minutes of longitude on a side. Used as a standard surface area mapping unit by the U.S. Geologic Survey.
Digital Elevation Model (DEM) : Terrain elevation data organized by quadrangle and provided in digital form.
Digital Terrain Model (DTM): A three-dimensional model of the Earth's surface, provided in digital form.
A map containing contours indicating lines of equal surface elevation (relief), often referred to as topo maps.
2. Often used to refer to a map sheet published by the U.S. Geological Survey in the 7.5-minute quadrangle series or the 15-minute ...
I have chosen the easiest way to find free elevation data in grid format: searched for DEM data on the Internet and downloaded the Concrete West quadrangle of Washington state (the first complete quad on the top left of figure 6) from the USGS ...
Geologic Survey came into existence in 1879 and began issuing maps of land surveys, the polyconic was the only projection used for the agency's topographic quadrangles until the mid 20th century. This emphasis on usage by U.S.
Click on an area of the index map to query the Map Lineage data base for "metadata" for National Topographic System (NTS) map sheets within the quadrangle. Metadata includes the sheet name, version, contour interval, datum, etc.
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Quarter-Quad: Refers to a map sheet size that is one-quarter of a 7.5 minute USGS quadrangle. DOQQ is a digital orthophoto quarter quad, a map product @ 1=1,000' used by the USGS and many statewide programs.
This is NOT to be used to generate a vector map of USGS quadrangles, because USGS quads are not exact rectangles.
EXAMPLE
Make a 4x3 grid, cells 20km a side, with lower left corner at 2716500,6447000: ...
DLGs supply users with the digital version of information printed on USGS topographical quadrangle maps. domain System context: A class of systems that have similar requirements and capabilities.
 See also: Information, Geographic, Mapping, Area, Map
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