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A Cartesian grid is a special case where the elements are unit squares or unit cubes, and the vertices are points on the integer lattice. A rectilinear grid is a tessellation by rectangles or rectangular cuboids (also known as rectangular parallelepipeds) that are not, in general, all congruent to each other. The cells may still be indexed by ...
More specifically, all north–south running lines (all range lines and half of all section lines), as with the prime meridian, are always established with reference to true, geodetic north. But it is a physical impossibility to meet this condition and still maintain a rectangular land grid, because such lines converge on the north pole.
A wide variety of such grids have been proposed or are currently in use, including grids based on "square" or "rectangular" cells, triangular grids or meshes, hexagonal grids, and grids based on diamond-shaped cells. A "global grid" is a kind of grid that covers the entire surface of the globe.
The primary grid pattern is of quarter sections (1 ⁄ 2 mi × 1 ⁄ 2 mi (800 m × 800 m)). In U.S. land surveying under the Public Land Survey System (PLSS), a section is an area nominally one square mile (2.6 square kilometers), containing 640 acres (260 hectares), with 36 sections making up one survey township on a rectangular grid. [1]
The grid is rectangular, with a set number of orthogonal coordinates (usually latitude and longitude). At a given latitude (or parallel), the gridpoints are equally spaced. On the contrary along a longitude (or meridian) the gridpoints are unequally spaced. The spacing between grid points is defined by Gaussian quadrature.
a) Structured curvilinear grid arrangements (vertices having similar neighborhood). b) Unstructured grid arrangements (vertices having variation in neighborhood). Structured curvilinear grids. 1) Grid points are identified at the intersection of coordinate line. 2) There are fixed number of neighboring grids for interior grid.
Blocks of 80, 40, and 10 acres establish a street grid at the outskirts which continues into the more finely divided downtown area. A city block , residential block , urban block , or simply block is a central element of urban planning and urban design .
Regular grid, a tessellation of space with translational symmetry, typically formed from parallelograms or higher-dimensional analogs Grid graph, a graph structure with nodes connected in a regular grid; Square grid, a grid of squares; Triangular grid, a grid of triangles; Hexagonal grid, a grid of hexagons