Why Google earth has developed in Qt, because of which quality of Qt.
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Why Qt is best suited for developing a GIS application?
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Hi and welcome to devnet,
Question best asked to the Google Guys ;)
Anyway, you have several applications/framework in that field already written with Qt like KDE's "Marble":https://marble.kde.org or "QGIS":http://en.wikipedia.org/wiki/QGIS