According to the author Philip Burden, Gastaldi's 1548 edition of Ptolemy's Geography, "was the most comprehensive atlas produced between Martin Waldseemüller's Geographia of 1513, and the Abraham Ortelius Theatrum of 1570," because it included regional maps of the Americas. Yet Gastaldi's detailed attention to the new world was not his only contribution to the development of map production.
Author Philip Burden asserts that Gastaldi's 1548 edition of Ptolemy's Geography, "was the most comprehensive atlas produced between Martin Waldseemüller's Geographia of 1513 and Abraham Ortelius Theatrum of 1570," because it included regional maps of the Americas. Yet Gastaldi's focus on the new world was not his only contribution to mapmaking.