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Geometry

GIS  Geometric transformation  Geoprocessing

Geometry Portal
Geometry (Greek γεωμε"ρία; geo = earth, metria = measure) is a part of mathematics concerned with questions of size, shape, and relative position of figures and with properties of space.


geometry -
(1) [Euclidean geometry] The measures and properties of points, lines, and surfaces. In a GIS, geometry is used to represent the spatial component of geographic features.

Geometry and the Imagination in Minneapolis
John Conway Peter Doyle Jane Gilman Bill Thurston
June 1991
Version 0.91 dated 12 April 1994 ...

Geometry-symbol layer combinations
For example, adding a fill layer to a line representation rule would generate a warning because there is no polygon geometry to fill.

Close the geometry_columns table and right click the spatial_ref_sys table and select View Data View All Rows.

coordinate geometry traverse
[ESRI software] In Survey Analyst, a process of computing a sequence of survey point locations starting from an initial known point.

Coordinate Geometry
Used to construct mathematical/geometric models of a design and its environment. See also COGO.

Geometry Converters
PostGIS with shp2pgsql:
shp2pgsql -D lakespy2 lakespy2 test lakespy2.sql
e00pg: E00 to PostGIS filter, see also v.in.e00.

geometryGeometry deals with the measures and properties of points, lines and surfaces. In ARC/INFO, geometry is used to represent the spatial component of geographic features.

Civil Geometry tools are coordinate geometry (COGO) tools that utilize a heads-up interface, preserving user input and design intent. Results of these tools are intelligent graphic elements stored in the DGN. Civil Geometry includes: ...

Link (geometry): An element of geometry that connects nodes. In a polygon topology, a link defines a polygon edge. Links can contain vertices and true arcs, and can be represented as a line, polyline, or arc.

Geometry > Projective Geometry > Map Projections >
Conic Projection
A conic projection of points on a unit sphere centered at consists of extending the line for each point until it intersects a cone with apex which tangent to the sphere along a ...

Geometry Alignment removes discrepancies between geometries.
Information Transfer involves updating one dataset with information from the other.

Geometry of color elements of various CRT and LCD displays; phosphor dots in a color CRT display (top row) bear no relation to pixels or subpixels.

Geometry ratio
numeric values are proportional to the original area or length of the feature
Each field in the layer attribute table can have split policies applied.

Geometry Output functions - these are important particular for web-development when using the various javascript, flash apis ...

Geometry is complex. The geometrical algorithms needed for polygon overlay and the calculation of distances, depending on the projection/coordinate system used, require experienced programmers.

Geometry and topology; Greater than; Geologian Tutkimuskeskus = Geological Survey of Finland
G.T.
Gas tank ...

Geometry; Imperial guards
G&M
Geography and Map; geography and Map Div.

The geometry of the earth has been discussed, studied, and imagined forever. The ancient Greek philosophers tried to picture a pure geometrical model.

The geometry of the thematic data is entirely or partially described by the base geometry dataset.
The thematic dataset holds information that also describes objects of the base dataset.

The geometry of GIS data is referenced in coordinates that are embedded in the data file. Shape files that you get from ESRI StreetMap and from the ESRI Data CDs use Latitude and Longitude as the coordinate system.

In the geometry of the sphere, great circles play the part of straight lines. They represent the shortest distance between two points. Every great circle is determined by a plane that contains the center of the sphere.

About the Geometry of Datums
In order to calculate where latitudes and longitudes occur on the surface of the Earth a number of fundamental geometric concepts and practices need to be applied. In simple terms these include: ...

coordinate geometry (COGO) This refers to a data conversion process in which a digital map is constructed from written descriptions, such as legal descriptions of land parcel boundaries.

Coordinate geometry - The methods used to construct graphics mathematically in engineering design. It is usually referred to as COGO.

Coordinate system - A system used to register and measure horizontal and vertical distances on a map.

Coordinate Geometry - COGO
A method of defining geometric features through the input of bearing and distance measurements.

Coordinate Geometry
A third technique for the input of spatial data involves the calculation and entry of coordinates using coordinate geometry (COGO) procedures.

Computational Geometry
This is the discipline of developing efficient algorithms to solve problems of spatial analysis.

Figure 5-9. Geometry of an EDM (Basic Example)
OBSERVATION PRECAUTIONS ...

While the vector geometry has a large amount of models the raster model even with the newly added extensions [16] does not contain conceptually new ideas (not even the tesseral indexing is allowed).

COGO: CO-ordinate GeOmetry. Algorithms for handling basic two and three dimensional vector entities built into all surveying, mapping and GIS software. Co-ordinate Numbers representing the position of a point relative to an origin.

In ArcCatalog the geometry and data model is identified by an icon. Only file formats recognized by ArcCatalog as geographic data will be displayed.

AGG Anti-Grain Geometry A high quality graphics rendering engine that MapServer 5.0+ can use. It supports sub-pixel anti-aliasing, as well as many more features. CGI Wikipedia provides excellent coverage of CGI. EPSG ...

COGO - Coordinate Geometry: A set of procedures for encoding and manipulating bearings, distances and angles of survey data into co-ordinate data. COGO is frequently a subsystem of GIS.

A feature is not defined in terms of a single geometry, but rather as a conceptually meaningful object within a particular domain of discourse, one or more of whose properties may be geometric.

31 basic components that are sufficient to build a larger system; the primitives of two-dimensional geometry are points, lines, and areas. projection p.

COGO See coordinate geometry. Colour composite In remote sensing, a colour image composed of three bands projected in the red, point and green guns. Column A vertical field in a relational database management system data file.

Abbreviation of the term COordinate GeOmetry. Land surveyors use COGO functions to enter survey data, to calculate precise locations and boundaries, to define curves, and so on.
2. The name of the ArcInfo coordinate geometry software product.

The shape of Earth's surface or the geometry of landforms in a geographic area.
Trace Element:
An element that is present in very small quantities.
Traction: ...

Geodatabases support large collections of objects in a database table and features with geometry. The feature classes and tables contained in geodatabases can be related to one another.

Such a map database is a vector representation of a given road network including road geometry (segment shape), network topology (connectivity) and related attributes (addresses, road class, etc).

- GML parser that handles complex feature data and metadata, including support for multiple geometry types in a nested structure. As any developer can tell you, parsing GML can be a challenge and this tool takes care of the work for you.

In GIS the shapes and locations of things are stored as coordinate geometry. GIS data is often stored in a database, either storing the coordinates as numbers or using special geometry data types.

TopologyA set of rules that models the relationship between neighboring points, lines, and polygons and determines how they share geometry.

View angle is an important component of the imaging geometry. View angle and illumination geometry (solar zenith and azimuth angles) are important determinants of the measured reflectance since adjustments in observation and illumination geometry ...

Because of the alignment limitations of the squares and cubes used in Cartesian geometry, ...

By 1980, the Loran-C User Handbooks provided separate charts of coverage for each chain based on geometry, noise, and signal strength. These charts assumed a three station, Master-Secondary- Secondary receiver.

Event features, the segmentation points, are not stored in the geometry of the coverage but are derived as needed.

DOP is an indicator of the quality of the geometry of the satellite constellation. Your computed position can vary depending on which satellites you use for the measurement.

Geodatabases store geometry, a spatial reference system, attributes, and behavioral rules for data.

" These databases contain first the geometry element layer of the roadway that contains links, nodes, shape points, relative elevations, and connectivity.

GIS data used in the model can be raster, vector, textual and hybrid types from many diverse sources using state-of-the-art techniques: geometry from CAD systems; video and slide images; commercially available digital data (vector and/or raster); ...

A measure of the GPS receiver/satellite geometry. A low DOP value indicates better relative geometry and higher corresponding accuracy.

Acronym for Coordinate Geometry, COGO is a subsystem of CAD or GIS made up of a set of standard procedures for processing survey data such as bearings, ...

helpful in studying the effects of geometry and spatial arrangement of habitat
e.g. size and shape of woodlots on the animal species they can sustain
e.g. value of linear park corridors across urban areas in allowing migration of animal species ...

The earth is actually best approximated as an oblate spheroid, meaning that it is flattened at the poles, although this geometry does not quite describe its shape exactly either.

A specific kind of area that involves a complex geometry. This type of area is formed of inclusive and exclusive lines. Inclusive lines define the external delimitation of the area, while exclusive lines delimit the internal zones to be excluded.

" The first half of this chapter is devoted to geodesy and coordinate geometry, both plane and earth. The second half of the chapter begins with an introduction to map projections.

a collective noun to describe any GIS geometry object (point, line or polygon)
don't use it
generalisation ...

[graphics (computing)] The process of drawing to a display; the conversion of the geometry, coloring, texturing, lighting, and other characteristics of an object into a display image.
Map element ...

void polygon -- defines a part of the two-dimensional manifold that is bounded by other GT-polygons, but otherwise has the same characteristics as the universe polygon. The geometry and topology of a void polygon are those of a GT-polygon.

The measure of how much the geometry of the satellites affects the horizontal position estimate.
L
LOI ...

Attribute labeling is another issue here. GIS and mapping data requires extensive attribute labeling to link graphical items to database, while CAD drawing are mostly shape and geometry oriented and spatial analysis is hardly done.

Implement in-process quality assurance by leveraging relational geodatabase models, extended attribute validation rules, and automated geometry validation.

The orthographic, stereographic and gnomonic projections are all based on solid principles of perspective and Euclidean geometry, while the azimuthal equidistant dates from the 15th century and is constructed arbitrarily.

This allows end users in different parts of the world to make more accurate predictions of GPS performance in their particular location, taking into account regional effects of the atmosphere and satellite geometry, ...

As discussed earlier, the amount of insolation being received by a location on the Earth varies both spatially and temporally because of Sun-Earth geometry, Earth rotation, and spatial differences in the Earth's atmospheric transparency.

This field represents the geometry of the features in the GeoDataset. The programmer can use "Shape" to get the collected spatial data and display it by the Map.DrawShape method. The attribute data can be displayed by Map.DrawText method.

Several optional extension products add application-specific tools to ARC/INFO, including: NETWORK (network modeling), TIN (surface modeling and terrain analysis), COGO (interactive coordinate geometry data entry and management), ...

See also: See also: Feature, Information, Model, Map, Analysis

GIS  Geometric transformation  Geoprocessing

 
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