March 6, 2017
By George Demmy
We recently got a question from a customer asking how to create GeoPDF maps that have features that turn on or off as you zoom in like the USGS US Topos do. Maps for America! I love it! But I digress. This behavior is something that most Web mapping or GIS types understand intuitively – when you’re zoomed out at a continental view, you don’t see Buford, Wyoming but you do see states and the like. However, when you zoom in, at some point, you see Buford and its Ames Brothers Pyramid. Some features in the US Topos have this scale-dependent property and it’s essential for the usability of those maps. Cartography is not the art and science of putting stuff at the geographically correct position relative to each other on a map – it’s making that geo-contextualized information useful. For the creation of PDF maps, this is where TerraGo Publisher really helps.