Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Mapping the world beyond web mercator

Mapping the world beyond web mercator

Most popular mapping presentations today, ranging from clients to servers, show and discuss only maps in EPSG:3857, the popular Mercator derived projection used by OSM as well as
most commercial tiles providers.

There is however an interesting, exciting world of map projections out there, that are still being used in a variety of context. This presentation will introduce the advancement made in GeoTools and GeoServer to handle those use cases, where users have a worldwide data set, and need to view all or part of it in multiple projections, some of which valid in a limited area, and requiring the software to perform a proper display of it on the fly, without any preparation.

We’ll discuss GeoTools/GeoServer “advanced projection handling” manages to deal with these cases, wrapping data, dealing with the poles and the dateline, cutting on the fly excess data, densifying on the fly long lines as needed to ensure a smooth reprojection, for a variety of cases, ranging from seemingly innocuous datum shifts, maps having the prime meridian over the pacific, and the various tricks to properly handle stereographic, transverse mercator, Lambert conic and other limited area projections against world wide source data sets.

Simone Giannecchini

September 02, 2018

More Decks by Simone Giannecchini

Other Decks in Programming


  1. GeoSolutions ⚫ Italian SME ⚫ Expertise • Image Processing, GeoSpatial

    Data Fusion • Java, Java Enterprise, C++, Python • JPEG2000, JPIP, Advanced 2D visualization ⚫ Supporting/Developing FOSS4G projects ⚫ GeoServer, MapStore ⚫ GeoNetwork, GeoNode, Ckan ⚫ Clients ⚫ Public Agencies ⚫ Private Companies ⚫ http://www.geo-solutions.it FOSS4G 2018, August 29th/31st, Dar Es Salaam
  2. Equal-area maps to the rescue Lambert azimuthal equal area Mollweide

    Equal Earth FOSS4G 2018, August 29th/31st, Dar Es Salaam
  3. APH step 1: which data to read Requested Read FOSS4G

    2018, August 29th/31st, Dar Es Salaam
  4. No reprojection, but Pacific centered Would really like to see

    Americas here… FOSS4G 2018, August 29th/31st, Dar Es Salaam