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Telecommunication Application
An example over Tokyo, Japan

### Overview

As the cellular telephone industry booms, there is a great demand for geographic information used in Radio Frequency engineering, drive and site acquisition.

Because SPOT imagery is directly compatible with most geographic information systems (GIS), it also finds applications in such areas as telecommunications. Siting studies for cellular telephone networks demand accurate knowledge on both relief and land use. SPOT imagery can be stored in a database to give service providers a reliable source of geographic information at all times. Network engineers and business planners alike can now access the most current and accurate geographic information, including satellite imagery, three-dimensional digital elevation models, transportation and clutter/morphology databases.

Map of Tokyo, Japan |

### Telecom Products

In order to answer to such a growing demand suppliers designed specific products covering cities and regions for areas targeted for GSM or PCS networks. A typical product will includes four elements:

- DTM (digital terrain model) are 3-D models of the earth's surface. They give information about the location and characteristics of all obstacles to wave propagation.

- Satellite Imagemaps (Orthoimages) are highly detailed images that have been corrected for geometric distorsion.

- Linear Features Files identify transportation networks and landscape boundaries (roads, rivers, highways,...)

- Land Use Maps (also called clutter maps) reveal geographic distribution of natural features and buildings. Categories are identified in 5 or 12 "classes": building, parks, suburbs, lakes, ...)

These products are provided on digital files with specific formats directly compatible with existing Radio Frequency Planning Software.

© CNES 1996 . Orthorectified SPOT image over Tokyo, Japan |

### Sample

The samples shown on this page include a conventional map of Tokyo (Japan), and three satellite data products: a satellite orthoimage, a DTM and a Clutter map. These three products are based on the information extracted from a SPOT image stereo pair. They had been produced by ISTAR, a French company with a leading position in digital cartography applied to the design of cellular networks.

Digital Elevation Model derived from SPOT stereopair, Tokyo, Japan | 12-Class Clutter Image, Tokyo, Japan