Glossary

Digital map is the basic component of planning system. All the tasks carried out in a planning system are in some way related to the digital map. Digital map for radioplanning describes all types of obstacles on land surface in defined level of details, that will influence wave propagation.

Digital data that represent the geographical location and characteristics of natural or man-made features, phenomena and boundaries of the Earth. Geodata represent abstractions of real-world entities, such as roads, buildings, vehicles, lakes, forests and countries. Geodata refers to such data in any format, including raster, vector, point, text, video, database records, etc.

Geographic Information System. A computer system for capturing, storing, checking, integrating, manipulating, analyzing and displaying data related to positions on the Earth`s surface.

Raster or GRID data showing by means of a coding system the various purposes of land parcels.

Generally refers to a representation of the Earth's surface (or subset of this), excluding features such as vegetation, buildings, bridges, etc.

The emphasis of Spatial Analysis is to measure properties and relationships, taking into account the spatial localization of the phenomenon under study in a direct way.

Represents Earth’s surface including buildings, vegetation, and roads, as well as natural terrain features.

The degree to which information on a map or in a digital database matches true or accepted values. Accuracy pertains to the quality of data and the number of errors contained in a dataset or map. In discussing a GIS database, it is possible to consider horizontal and vertical accuracy with respect to geographic position, as well as attribute, conceptual, and logical accuracy. The effect of inaccuracy and error on a GIS solution is the subject of sensitivity analysis. Accuracy, or error, is distinguished from precision, which concerns the level of measurement or detail of data in a database.

The smallest unit of information available for Land Use Map, DTM and other GRID and raster data supplied as one bundle.

A set of all image features of the same type. As part of the interpretive process, the user names a class to identify the type of material it contains, like "dense urban," "residential", "inland water", or "urban". A class normally corresponds to a specific land cover type that is needed for some particular tasks. In case of Radioplanning – clutter classification is focused on types of obstacles, that influence waves propagation.

A geographic data model representing information on an array of equally sized square cells arranged in rows and columns. Each grid cell is referenced by its geographic X, Y location.

The smallest unit of information in an image or raster map. Referred to as a cell in an image or grid.

The Shuttle Radar Topography Mission - Digital elevation data set that spans the globe from 60° north latitude to 56° south latitude, approximately from the southern tip of Greenland to below the southern tip of South America. It has a horizontal grid spacing of 30 arc-seconds (approximately 1 kilometer). http://www2.jpl.nasa.gov/srtm/ This data is free of charge and due to the nature of radar data has good value of accuracy on flat areas, but for build-up areas, dense forests, canyon and complex topographic situations may have a great uncertainty.

Indications of the degree to which data satisfies stated or implied needs. This includes information about lineage, completeness, currency, logical consistency and accuracy of the data.

A 3D reference coordinate system with well-defined origin and orientation of the coordinate axes. A mathematical system.