Dynamic Building Extrusion in Electronic Maps

A non-transitory computer-readable storage medium storing computer program instructions executable by one or more processors, the computer program instructions comprising instructions to:

• maintain a style sheet for an electronic map representing two-dimensional electronic map data, wherein the style sheet comprises a plurality of style layers, each style layer comprising a plurality of style layer properties defining visual representations within the electronic map of map features;
• obtain electronic map data representing a specific building;
• generate an extruded building graphical element illustrating the specific building in three dimensions, wherein the plurality of style layers comprises an extrusion style layer comprising a reference to the extruded building graphical element that specifies the extruded building graphical element for rendering in three dimensions;
• and
• render the electronic map such that the extruded building graphical element is rendered within the electronic map in three dimensions as indicated by the extrusion style layer, and such that graphical elements representing buildings other than the specific building are rendered in two dimensions in the electronic map.

A system, comprising:

• one or more processors;
• and
• a non-transitory computer-readable storage medium storing computer program instructions executable by the one or more processors, the computer program instructions comprising instructions to:
• maintain a style sheet for an electronic map representing two-dimensional electronic map data, wherein the style sheet comprises a plurality of style layers, each style layer comprising a plurality of style layer properties defining visual representations within the electronic map of map features;
• obtain electronic map data representing a specific building;
• generate an extruded building graphical element illustrating the specific building in three dimensions, wherein the plurality of style layers comprises an extrusion style layer comprising a reference to the extruded building graphical element that specifies the extruded building graphical element for rendering in three dimensions;
• and
• render the electronic map such that the extruded building graphical element is rendered within the electronic map in three dimensions as indicated by the extrusion style layer, and such that graphical elements representing buildings other than the specific building are rendered in two dimensions in the electronic map.