grid - [cartography]
(1) In cartography, any network of parallel and perpendicular lines superimposed on a map and used for reference.
See Also: ESRI Grid
[cartography] In cartography, any network of parallel and perpendicular lines superimposed on a map and used for reference.
A grid system allows the location of a point on a map (or on the surface of the earth) to be described in a way that is meaningful and universally understood.
A discretely uniform unit that represents a portion of the Earth. such as a square meter or square mile.
Grid-based map analysis is increasingly used to characterize conditions and impacts of infrastructure networks, such as pipe and power lines.
Grid Generation and GIS
Grid generation is a broad field with applications in aerodynamics, material science, biology, earth science, chemistry and physics, for example.
Grid templates available with the installation
A number of grid templates are delivered with ArcGIS and are located under the ArcGIS installation directory (\ArcGIS\Desktop10.1\GridTemplates).
The UTM Grid - Section 3
Section 3 - Rectangular Grid References
At one time or another, most of us have used a city map to find the location of a street. Such maps are usually divided by vertical and horizontal grid lines.
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The grid drawing may be turned off by using the -n flag.
The border drawing may be turned off by using the -b flag.
The coordinate text may be turned off by using the -t flag.
Grid layers are graphical representations of the ArcGIS and ArcInfo implementation of the raster data model. Grid layers are stored with a numeric value for each cell.
GIS data layer in raster format (cell-based representation)
Grid Snaps: It is difficult to put your mouse exactly on (90,90,0) isn't it? Right now, our drawing has a resolution down to the inch. Our life would be simpler if we could make out mouse snap to even increments of 10 feet.
grid -- (1) a set of grid cells forming a regular, or nearly regular, tessellation of a surface; (2) a set of points arrayed in a pattern that forms a regular, or nearly regular, tessellation of a surface.
A pattern of regularly spaced horizontal and vertical lines forming square zones on a map used as a reference for establishing points. Grid examples are UTM, MGRS, and Maidenhead.
GRID: A United Nations program to assemble, use, and disseminate data sets of global extent of use to United Nations and other agencies.
grid cell: A single cell in a rectangular grid.
Grid: A geographic data model representing information as an array of equally sized square cells arranged in rows and columns. Each grid cell is referenced by its geographic x,y location.
GRIDA fully integrated grid(cell-based) geoprocessing system for use with ARC/INFO. GRID supports a Map Algebra spatial language that allows sophisticated spatial modeling and analysis.
Grid and Map Overlays
Silva Navimap -- electronic map reading / overlay device
U.K.: Yeoman PLC's Navigator Pro is a plotting table with GPS inputs that works with Admiralty charts. Quite impressive.
The grid represents lines having constant rectangular coordinates (x, y). The grid is almost always a rectangular system and is used on large and medium scale maps to enable detailed calculations and positioning.
The Arc/Info Binary Grid format is the internal working format of the ESRI Arc/Info Grid product. It is also usable and creatable within the spatial analyst component of ArcView 3.x.
4 Grid references
Store grid references in an appropriate notation for easy transition to a GIS or conversion to an appropriate map projection (e.g.
The UTM Grid
The best known use of the transverse Mercator projection is the specialized form called Universal Transverse Mercator (UTM) projection system.
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Attributes Coded with Image
Other Forms of Coding
Image and Attribute Distinction
The graphic side of a map is the lines and descriptors. Examples of these lines are rivers or roads.
Grid data sets come from many sources: remote sensing devices, converted topographic maps, interpolated point data, conversion from vector features, and derived from other features (through distance, proximity, and density calculations, for instance).
Grid placement tools for ceiling mounted equipment
Bi-directional Lighting Analysis interface to Visual Pro in design mode ...
Grid Cell Map
Map displaying spatial information in the form of color coded, equal sized rectangle, squares, equilateral triangles or hexagons.
A network of uniformly spaced horizontal and vertical lines employed to allow an exact reference to any point on a map.
Grid Index Features
Creates a grid of rectangular of polygon features that can be used as an index to specify pages for a map book using Data Driven Pages. A grid can be created that only includes polygon features that intersect another feature layer.
Grid Cell - An element of a raster data structure (see raster).
GUI - See Graphical User Interface.
Grid Referenced Information Display System; Gridded Resource Inventory Data System
Geodetic Reference System ...
The grid-zone designation.
The 100,000-meter-square letter identification.
The grid coordinates (also referred to as rectangular coordinates) of the numerical portion of the reference, expressed to a desired refinement.
tax grid, roads, major utility lines, schools, churches, recreation centers, county boundary
watersheds, WSSC grid, roads, major utility lines, schools, churches, recreation centers, county boundary ...
e.g. grid cells covering large areas
historically, natural resource GIS have been raster-based ...
7. 3D grid file creation and real time 3D display of the generated vector data. Animate the 3D display at any angle specified and see the vector data in a brand new way.
Such a grid can be placed anywhere on a map and used to assign locations to points on the map.
T-in-O maps ...
UTM Map grid and the Australian Map Grid
As is explained in the section tiled Explaining Some Jargon - Graticules and Grids there is a significant difference between the two. This is ...
Military Grid Reference System
Maine Geological Survey; Maryland Geological Survey; Minnesota Geological Survey; Mars Global Surveyor (satellite) ...
Creating a grid across the view can help to better reference the view. This can be especially important when printing out a map for later use.
After initialization the user is presented with a world map showing the currently defined Loran-C transmitters. Using zoom tools the user selects an area for coverage prediction.
in a regular grid of values, one for each cell,
a regular lattice of points or
a 'triangulated irregular network' (TIN) of points.
Digital Exchange Format (DXF)
ASCII text files defined by Autodesk, Inc.
grid - Network of uniformly spaced parallel lines intersecting at right angles.
See the Universal Transverse Mercator (UTM) Grid System. Recumbent Fold A fold in which the axial plane is almost horizontal.
Graticule - The grid of latitudes and longitudes drawn on a map or a globe.
GRS80 (Geodetic Reference System of 1980) - A standard defining the size and shape of the Earth as adopted by the International Union of Geodesy and Geophysics in 1979.
41 a framework for recording spot elevations in a regular rectangular grid (matrix); an acronym originally created from Digital Elevation Model at US Geological Survey.
A GIS database includes data about the spatial location and shape of geographic features recorded as points, lines, areas, pixels, grid cells, or tins, as well as their attributes.
Geocoding: The cross-referencing between specifically recorded x,y co-ordinates of a location, relative to a standard reference grid such as the NC State Plane Grid, and non-geographic data such as addresses or Zip codes.
point to grid interpolation Source: GETIS glossary The conversion from a geospatial data set that represents a surface with points and their attributes (e.g. terrain heights) to a grid (raster) data structure that represents the same surface.
The grid is defined by identifying one of its corners (lower left usually), the distance between nodes in both the X and Y directions, the number of nodes in both the X and Y directions, and the grid orientation.
Recorded x, y coordinates of a location are cross-referencing between a standard reference grid and non-geographic data such as addresses or zip codes to accurately map that location. In order to geocode, a geocoding service must first be defined.
For example if we want to deliver the data in a regular grid, but the samples are measured in scattered points we have to calculate the values of grid points from the samples using interpolation procedures.
For example an aerial photograph may need to be stretched (orthorectified) using photogrammetry so that its pixels align with longitude and latitude gradations (or whatever grid is needed).
This system is broken down into grid zones. For states extending predominantly east-west, this system uses the Lambert conformal conic projection.
The first is called "Calculations involved in preparing a grid of graticule" and is heavily math oriented, containing formulas for several projections. The second section is concerned with accurately drawing a graticule manually.
In contrast, the "raster" or "grid-based" format generalizes map features as cells or pixels in a grid matrix (figure 3.3). The space is defined by a matrix of points or cells, organized into rows and columns.
Value Attribute Table. A table containing attribute for a grid. In addition to user defined attributes, the VAT contains the values assigned to cell in the grid and a count of the cells with those values.
E00 - Is ArcInfo's interchange format. It is used to enable a coverage, grid, TIN and associated INFO tables to be transferred between different machines. (ESRI website - March 2010) ...
For centuries, both Greek and Chinese scientists attempted several different methods but a reliable one did not develop until the ancient Greek geographer, astronomer and mathematician, Ptolemy, created a grid system for the Earth.
A raster image comprises a collection of grid cells rather like a scanned map or photograph. Both the vector and raster models for storing geographic data have unique advantages and disadvantages. Modern GIS systems are able to handle both models.
See also: Information, Map, Geographic, Feature, Location