domenica, marzo 21, 2010

WFS e WMS - Flavio, dal Forum ci spiega cosa sono

Ciao a tutti,
oggi vorrei pubblicare un bell'intervento del forum che ha fatto Flavio di Roma.
In particolare Flavio, ci ha parlato dei servizi WEB, WFS e WMS.
Sicuri di sapere esattamente cosa sono ed in cosa differiscono?
Se non siete sicuri, leggetevi questo post
Grazie Flavio

Il WFS (Web Feature Services), a differenza del WMS (Web Map Services), non riceve immagini generate dal server, ma riceve direttamente le coordinate degli elementi che formano l'oggetto, difatti all'interno del .map (grazie al quale è pubblicato) non c'è simbologia.
Questo permette di poter ricostruire l'oggetto.
Software gratuiti come ADBToolbox (che trovate all'interno del portale cartografico nazionale) carica e ricostruisce un layer in WFS con la possibilità di poterlo salvare come shapefile successivamente alla sua visualizzazione (come se fosse un event layer di ArcMap).
ESRI, a differenza dell'ADBToolbox, permette di fare direttamente il download del dato prima ancora di visualizzarlo, attraverso il quick import del data interoperability e scegliendo appunto il formato WFS.
Fate attenzione però che non tutti gli strati è possibile questa cosa poichè per alcune impostazioni di sicurezza, è stato impostato un limite massimo di oggetti in download per ogni Feature Class.

Tutto questo vale per gli oggetti Feature Class, mentre per gli strati Raster esiste il WCS (Web Coverage Services).

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