Prima di costruire una mappa online it is important to decide on the purpose: to those who serve the map we want to achieve and how it can be used? better if we could shed light on these things, it will be easier the next job.
These two initial applications force us to think about which tools users will use to display the data: we want users to use maps embedded (embedded) in a web page (by example. Google Maps) or offer maps that require the 'installation of a special program (such as Google Earth)? It is not a small matter. The use of such an external program can result in a narrowing of the target of potential users of the map, Due to various reasons, including the following:
- requires that the user stops browsing and use of time (varies depending on the bandwidth) to download the software to install;
- takes time and a minimum expertise to install the program (many are novice users, that once downloaded a program have difficulty even identifying the downloaded installation file!)
- external programs such as Google Earth, involve the availability hardware resources and bandwidth are much higher, for example, what is required for Google Maps, etc.
The use of external programs also means that the user leaves the pagina web, scelta rischiosa se si vuole mantenere l'utente sul sito.
Negli ultimi tempi comunque la differenza, nel mondo dei geobrowser, tra sistemi che funzionano all'interno di una pagina web e sistemi che necessitano l'installazione di software esterno si è andata riducendo: ad esempio in Google Maps, tramite l'installazione di un plugin, è ora possibile utilizzare la modalità Earth, che permette di accedere ad una sorta di Google Earth in formato ridotto. Questo implica tuttavia sempre l'installazione di un software esterno ma certamente più leggero di Google Earth full e in ogni caso funzionante all'interno della pagina web.
D'altra parte fornire mappe tramite Google Earth full permette di sfruttare appieno le funzionalità three-dimensional navigation of the program giving the user a more interactive, but involves, as mentioned previously, is a price to pay.
E 'therefore important to always think of what mode of use may be more suited to the purpose of the map: you can obviously provide more details. Often it is the best choice, but obviously requires more preparation time. The picture presented by the portal is ArcheoVeneto , there are two possibilities: data access through Google Maps and the ability to download KML files for display in Google Earth. 
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