Adaptive Composite Map Projections

We develop adaptive composite map projections that combine several projections and adapt the map's geometry to scale, to the map's height-to-width ratio, and to the central latitude of the displayed area. Multiple projections are combined and their parameters adjusted to create seamless transitions.

Unlike the web Mercator projection, which is currently used by all major web mapping services, composite projections show the entire globe including poles; they portray continents or larger countries with less distortion (optionally without areal distortion); and they can morph to the web Mercator projection for maps showing small regions.
2016 National Science Foundation NSF Vizzies Visualization Challenge – Interactive

2015 Avenza Award for Electronic Mapping Highly Commended (2nd place) by the British Cartographic Society

2015 Cartography and Geographic Information Science Map Design Competition: Interactive Digital

Jenny, B. (2012).
Adaptive composite map projections.
IEEE Transactions on Visualization and Computer Graphics (Proceedings Scientific Visualization / Information Visualization 2012), 18-12, p. 2575–2582.

Šavrič, B. and Jenny, B. (2014).
A new pseudocylindrical equal-area projection for adaptive composite map projections.
International Journal of Geographic Information Science, 28-12, p. 2373–2389.

Jenny, B., Šavrič, B. and Patterson, T. (2015).
A compromise aspect-adaptive cylindrical projection for world maps.
International Journal of Geographical Information Science, 29(6), p. 935-952.
DOI: 10.1080/13658816.2014.997734

Jenny, B., Šavrič, B. and Liem, J. (2016).
Real-time raster projection for web maps.
International Journal of Digital Earth, 9(3), p. 215–229.
DOI: 10.1080/17538947.2014.1002867

Jenny, B., Liem, J., Šavrič, B. and Putman, W. M. (2016).
Interactive video maps: A Year in the Life of Earth’s CO2.
Journal of Maps.
DOI: 10.1080/17445647.2016.1157323

Šavrič, B. and Jenny, B. (2016).
Automating the selection of standard parallels for conic map projections, 90, p. 202–212.
Computers & Geosciences.
DOI: 10.1016/j.cageo.2016.02.020

The interactive Projection Wizard helps cartographers select a map projection that is optimized for the geographical area and the map format. Programming by Bojan Šavrič.

Šavrič, B., Jenny, B. and Jenny, H. (2016).
Projection Wizard – An online map projection selection tool.
The Cartographic Journal, 53(2), 177–185.
DOI: 10.1080/00087041.2015.1131938

Šavrič, B. and Jenny, B. (in press).
Automating the selection of standard parallels for conic map projections.
Computers & Geosciences.
DOI: 10.1016/j.cageo.2016.02.02
Stacks Image 642

Wagner's Transformation for the Lambert Azimuthal Equal-Area Projection

Bounding Parallel
Bounding Meridian
Equator / Central Meridian Ratio
  1. Lambert Azimuthal
  2. Hammer
  3. Eckert-Greifendorff
  4. Quartic Authalic
  5. Wagner VII
  6. Lambert Cylindrical
  7. Pseudocylindrical
Adaptive composite projections use the Lambert azimuthal equal-area projection for maps showing a continent or a smaller area. For world maps, other projections with less shape distortion must be used. To create a seamless transition between the Lambert azimuthal and a variety of world map projections, we use Wagner's transformation method.
Adjust the three parameters of Wagner's transformation method to create a variety of world map projections. All projections are equal-area.

The map above uses our CanvasMap library.