The URLs of vector tile servers look like this:
#Maptiler changing zoom level how to#
There are multiple formats for tiles, but here we’ll just look at the Mapbox vector tiles format, since that is what QGIS can support.īecause vector map tiles are designed to be viewed over the internet, the most basic principle of VMTs is that you typically to have a tile server, which is firing off vector tiles of data, and a GL style fil e that understands what data layers are delivered in this server’s tiles, and tells the browser how to render that data. Imagine your own version of OpenStreetMap, with pink highways, no railroads and emphasized parks, and you begin to get the idea. But now, as vector tiles, this data allows you to control colours, line weight, font, and, of course the visibility of elements. As raster tiles, OpenStreetMap data was ideal for areas where you just could not get decent data-if, say, you were mapping the streets of a city in Turkmenistan. You commonly have a map that’s been embedded in a web page that includes the javascript libraries for mapbox rendering, such as here.īut vector tiles offer the cartographer a lot. Their main use is for people viewing maps through browsers. Vector map tiles (VMTs) were not developed for GIS use. This means the server sends tiles of vector data, which are then styled at the user’s end by QGIS. QGIS 3.14 and above can handle vector tile servers as data sources. This means that if the label is supposed to be 2.5 mm high, it’ll be 2.5 mm high no matter what dpi you export at out of the print layout. If you work instead with vector tiles, the text labels are not baked into the tile: they are rendered by QGIS. In 2018 I described, at the end of a post, a way to work around this, but now there’s a better option.
Text labels and icons, like everything else, are “baked” into the raster tiles at a reasonable size for display at 96 dpi. The print layout also winds up asking for tiles at a higher zoom level. The reason those labels and icons come out so small with raster tiles is that your screen display is something like 96 pixels/inch, but the print layout has to pack them down to 300 pixels/inch.
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