Precision Data Services. The growth in the number of precision GNSS users (estimated at more than 300,000 globally in 2008) is encouraging government and the private sector to invest in precision GNSS infrastructure.
GIS Dictionary > precision
GIS Dictionary
Definitions for GIS terms related to operations such as analysis, GIS modeling and web-based GIS, cartography, and Esri software.
Precision Farming Modernizes Conventional Techniques
(Part 2) by Grant Mangold ...
Precision farming aims to optimize the use of soil resources and external inputs(fertilizers and herbicides) on a site specific basis.
Precision is sometimes stratified into:
Repeatability — the variation arising when all efforts are made to keep conditions constant by using the same instrument and operator, and repeating during a short time period; and ...
Precision Valley Communications
Strand and Design Example for Metrocast of Connecticut Upgrade and Rebuild Project."
Precision Valley Communications
Strand and Design Example for Metrocast of Connecticut Upgrade and Rebuild Project.
Precision Editing
Use Selection-Set Selectable Layers to make your buildings layer the only one that is selectable.
Set your buildings layer as your editing target
click one vertex ...
Precision timing
Precise timing is so important, that an error of 1/1000 of a second would result in a positional error of about 300,000 m.
Precision: Refers to the number of significant digits used to store numbers, and in particular, coordinate values. Precision is important for accurate feature representation, analysis and mapping.
Precision refers to the level of measurement and exactness of description in a GIS database. Precise locational data may measure position to a fraction of a unit.
Precision The closeness with which the measurements agree with each other.
Precision 1. If applied to paper maps or map databases, it means exactness and accuracy of definition and correctness of arrangement.
2. If applied to data collection devices such as digitizers, it is the exactness of the determined value (i.e.
Precision - Refers to the quality of the operation by which the result is obtained, as distinguished from accuracy.
precision approach procedure
a standard instrument-approach procedure in which an electronic glide slope is provided or used (for example, ILS and PAR approaches)
precision approach radar ...
3.4 Precision and Accuracy
In incorporating any spatial data source it is crucially important to consider the issues of precision and accuracy.
Precision of Cartesian Coordinates
the number of significant digits required for a specific project when using Cartesian coordinates depends on two measures:
size of the study area
resolution (accuracy) of measurement ...
precision in GIS software The degree to which the software can maintain the detail of a feature's location. The data may be maintained in either "single" or "double" precision.
precision
The closeness of a repeated set of observations of the same quantity to one another. Precision is a measure of the control over random error.
Precision Aerial Survey System (3Di)
PASSIA
Palestinian Academic Society for the Study of International Affairs ...
Precision - (1) The number of digits used to store a numerical value in computers; (2) The number of digits that a measuring device can use to record the numerical values of an observation.
...
The precision estimate provides an initial basis for determining a cell size appropriate to the calculation: to avoid making an error greater than X units, set the cell size no larger than X/1.4142 (X divided by the square root of 2).
double precision
distance measured along the line in LRS map from the beginning of the line to the beginning of the segment (absolute milepost distance)
end_map ...
Even more precision can be obtained by using a roamer (a small transparent card graduated with units of the proper scale) as shown in Figure 6. With the roamer, the reference can now be given as 91559435.
Dilution of Precision (DOP)
an indicator of satellite geometry for a unique constellation of satellites used to determine a position.
Dilution of Precision (DOP)
The total effect of all error sources in locating a GPS position.
Download ...
Accuracy vs. Precision
U.S. National Map Accuracy Standard
National Standard for Spatial Data Accuracy
Accuracy specifications for USGS land use / land cover maps.
USDA SCC soil maps
Cadastre
Attribute data
Sources of Error ...
Degree of precision of the digital topographic information compared to its corresponding reference to the geodetic network.
Dilution Of Precision (DOP)
A measure of the GPS receiver/satellite geometry. A low DOP value indicates better relative geometry and higher corresponding accuracy.
For very high precision calculations, when series expansion convergence becomes too slow, trigonometric functions can be approximated by the arithmetic-geometric mean, ...
Double-Precision Refers to a level of coordinate accuracy based on the possible number of significant digits that can be stored for each coordinate.
single precision Refers to a level of coordinate accuracy based on the number of significant digits that can be stored for each coordinate.
Accuracy, or error, is distinguished from precision, which concerns the level of measurement or detail of data in a database.
LSQR is an iterative solver so it starts with an initial estimate of the solution vector and uses the initial estimate to compute the next iteration of the solution vector, and then repeats until a solution of sufficient precision is achieved.
Accuracy and precision standards for the production of spatial digital data have also been defined by several organizations and institutions in Europe and USA.
thematic map See: map, thematic theodolite Precision surveying instrument for measuring horizontal and vertical angles. tide Periodic rise and fall of the water resulting from gravitational interactions between the Sun, Moon, and Earth.
precision and patience matter most. Small errors can accumulate and prevent fitting the last faces
using a dull blade (or a spent ballpoint pen) guided by ruler or straightedge, lightly and carefully score all folding lines before cutting.
This improved level of precision may encourage continued adoption of GPS as a preferred means of acquiring Universal Coordinated Time (UTC) and for synchronizing everything from electrical power grids and cellular phone towers to telecommunications ...
/* Function: ST_Buffer_Meters(geometry, double precision) DROP FUNCTION ST_Buffer_Meters(geometry, double precision); Usage: SELECT ST_Buffer_Meters(the_geom, num_meters) FROM sometable; */ CREATE OR REPLACE FUNCTION ST_Buffer_Meters(geometry, ...
In fact, a new term has sprung up - Precision Agriculture - which carries with it the essentual components of remote sensing and GIS.
Vector data provide for high precision in representing the location of features. Aronoff (1989) described how vector data can be used to define the location of a point, a line, and an area. A point is represented by a simple pair of coordinates.
To pass from a polyhedral surface to a smooth surface and to define curvature with mathematical precision, one needs to use integration in the definition for . But the conceptual idea is still the same.
The next two layers of precision are the ZIP+2 centroids and the 5-digit ZIP Code centroids. The ZIP+2 and the 5-Digit ZIP Codes vary widely in geographic size based upon natural features (such as rivers and mountains) and population densities.
Surveyors and map makers use GPS for precision positioning. GPS is often used to map the location of such facilities as telephone poles, sewer lines, and fire hydrants. Surveyors use GPS to map construction sites and property lines.
The classic Snapping environment is also supported as are precision-creation options such as parallel, perpendicular, deflection, and absolute XYZ.
Create and delete individual features.
in precision farming) etc. The basic concept of geostatistics is that of scales of spatial variation. Data which is spatially independent show the same variability regardless of the location of data points.
GIS provides the analytical capabilities that form the hub of a successful precision agriculture system. GIS lets farmers perform site-specific spatial analyses of agronomic data.
For instance, if you want your data to include decimal points, you will need to specify a 'precision factor'.
The Wherifone combines GSM voice technology and precision on-demand Enhanced-Global Positioning Satellite (E-GPS) technology enabled by Wherify to provide emergency 911 and other location services that will bring added safety and peace-of-mind for ...
Geodetic surveys are typically carried out with great precision, often over long distances, and are used not only to determine the size, ...
To achieve the precision necessary for accurate location, the Earth cannot be assumed to be a sphere. Rather, the Earth's shape more closely approximates an ellipsoid (oblate spheroid): flattened at the poles and bulging at the Equator.
Because of map resolution and the limits of precision in digitizing, the very small polygons (areas) may not have all of the characteristics analyzed, so another GIS function was used to screen out areas smaller than 10 acres.
area centroids (points used to represent areas) and related associated attribute information such as area names, identification numbers, latitude/longitude coordinates, polygon area calculation, demographics, inventories relating to area, precision ...
High Accuracy Reference Network (HARN) or High Precision Geodetic Network (HPGN) ...
Using modern satellite systems and surveying techniques, contemporary cartographers are now able to measure and map with very high precision and consistency. As a result, maps have become absolutely critical to most fields of human endeavour.
Atmospheric data analysis
Petroleum and mining exploration
Environmental analysis
Precision agriculture
Fish and wildlife studies ...
Global Positioning System (GPS) - a system of satellites and receiving devices used to compute positions on the Earth. GPS is used in navigation, and its precision supports cadastral surveying.
Accuracy relates to the exactness of the result, and is distinguished from precision which relates to the exactness of the operation by which the result was obtained" (Gittings & Patterson, 1999).
The inverse equations are more complicated and require either an iterative calculation of the latitude and ellipsoidal height, or it makes use of approximating equations like those of Bowring. These last have millimetre precision for 'earth-bound' ...
JPEG - Popular format of raster file, very efficient but lossy compression makes it more suitable for snapshots than precision aerial photographs (ITT Space systems).
Using too small a cell size will significantly increase the storage space and processing time required, without adding precision to the map.
 See also: Information, Analysis, GIS, Location, Software
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