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An example of a tourist Location Based Service (LBS) with Open Source Software
No full textLocation-based services (LBS) provide information and data to the
user based on geographical position. These services are usually
based on a communication network and one or more positioning
technologies, combined with geographical information systems
which collect the information and present it to the end user. An
LBS service is implemented within an infrastructure which must
contain at least these five elements: a mobile device (e.g. a cell
phone or PDA), a communications network (GSM, GPRS, UMTS), a
positioning component (GPS receiver), a service provider and
finally, a data provider. On an international level, both the ISO
Technical Committee 211 and the Open Geospatial Consortium
(OGC) issued standards and specifications regarding the LBS
services. This work concerns the development of a client–server
framework compliant with the OpenLS OGC standard and built
entirely with free and/or open-source software. The LBS service is a
tourist information application for the city of Cagliari in Sardinia
(Italy)
Real Time Mapping with DGPS-Enabled Navigation Equipment
No full textToday, differential GPS techniques allow common GPS receivers to achieve the precision levels required for mapping purposes. The development of systems for mobile Internet access (mainly GPRS) provides a fast and reliable method for feeding differential corrections to a GPS receiver in any area covered by a cell telephone network. With the increase in the available bandwidth, and the
example of data streaming applications like Internet-Radio or Internet-TV, the researchers are now trying to use the Internet as a medium for transmitting GNSS code and phase corrections for real-time surveys, and examining advantages and limitations of this approach. In this context the EUREF (EUropean REference Frame) started in June 2002 a project named EUREF-IP, with the purpose of developing a stable and robust infrastructure for broadcasting differential corrections via Internet. Inside this project the
Topography Section of the University of Cagliari has settled up a permanent station, which since July 2002 sends differential
corrections over the Internet for DGPS and RTK positioning. The permanent station, identified as “CAGZ”, is part of the IGLOS network and, since October 2003, of the EPN network. This paper describes the CAGZ permanent station, the servers software and
the field tests performed during this two years of uninterrupted GNSS data transmission, to evaluate the performances of the two servers activated. Also different network connections (LAN, GSM-Internet, GPRS-Internet) were compared in order to assess the improvements achieved by transmission medium. We present also some DGPS ant RTK surveys, performed with geodetic and handheld receivers for updating medium-scale and large-scale cartography
An example of a touristic Location Based Service (LBS) with Open Source software
No full textLocation Based Services (LBS) provide information and data to the user based on geographical
position. These services are usually based on a communications network and one or more
positioning technologies, combined with geographical information systems (GIS) which collect the
information and present it to the end user. An LBS service is implemented within an infrastructure
which must contain at least these five elements: a mobile device (e.g. a cell phone or PDA), a
communications network (GSM, GPRS, UMTS), a positioning component (GPS receiver), a
service provider and lastly a data provider.
On an international level, both the ISO Technical Committee 211 and the Open Geospatial
Consortium (OGC) issued standards and specifications regarding the LBS services.
This work concerns the development of a client-server framework compliant with the OpenLS
OGC standard and built entirely with Free and/or Open Source software. The LBS service is a
tourist information application for the city of Cagliari in Sardinia (Italy)
Esempio di Implementazione di PostgreSQL-PostGIS per l'analisi di immagine satellitare tramite WEB-GIS
No full textA tourist Location Based Service (LBS) for the Cagliari city
No full textLocation Based Services (LBS) provide information and data to the user based on geographical position. These services are usually
based on a communications network and one or more positioning technologies, combined with geographical information systems
(GIS) which collect the information and present it to the end user. An LBS service is implemented within an infrastructure which
must contain at least these five elements: a mobile device (e.g. a cell phone or PDA), a communications network (GSM, GPRS,
UMTS), a positioning component (GPS receiver), a service provider, and lastly a data provider.
On an international level, both the ISO Technical Committee 211 and the Open Geospatial Consortium (OGC) issued standards and
specifications regarding the LBS services. ISO/TC 211 handled the LBS standards in the ISO 19132 (Location based services
possible standard), 19133 (Location based services tracking and navigation) and 19134 (Multi-modal location based services for
routing and navigation) documents, while the OGC did the same with the OGC 05-016 (Open Location Services) specification.
This work concerns the development of a client-server framework compliant with the OpenLS standard, and built entirely with Free
and/or Open Source software. The LBS service is a tourist information application for the city of Cagliari in Sardinia. The client
application obtains its position from its integrated GPS receiver and sends it to the LBS server. The server (written in the Python
programming language) answers with information on interest points near the client. The system's architecture includes a cartography
server (using the GeoServer open source software) for sending map data to the client.
For the needs of this work, we implemented a variant of the Reverse Geocoding operation (part of the Location Utility service). Of
all the request described in the standard, thus, the server only answers the Reverse Geocode reques
IL SISTEMA PER LA TRASMISSIONE DI CORREZIONI DIFFERENZIALI VIA INTERNET DALLA STAZIONE PERMANENTE DI CAGLIARI. PRIMI RISULTATI
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