Map Style Formalization: Rendering Techniques Extension for Cartography

International audienceCartographic design requires controllable methods and tools to produce maps that are adapted to users' needs and preferences. The formalized rules and constraints for cartographic representation come mainly from the conceptual framework of graphic semiology. Most current Geographical Information Systems (GIS) rely on the Styled Layer Descriptor and Semiology Encoding (SLD/SE) specifications which provide an XML schema describing the styling rules to be applied on geographic data to draw a map. Although this formalism is relevant for most usages in cartography, it fails to describe complex cartographic and artistic styles. In order to overcome these limitations, we propose an extension of the existing SLD/SE specifications to manage extended map stylizations, by the means of controllable expressive methods. Inspired by artistic and cartographic sources (Cassini maps, mountain maps, artistic movements, etc.), we propose to integrate into our system three main expressive methods: linear stylization, patch-based region filling and vector texture generation. We demonstrate how our pipeline allows to personalize map rendering with expressive methods in several examples

ICDAR 2021 Soutěž v segmentaci historických map

Soutěž se zabývá zpracováním historických map, které obsahují často detailní a geometricky přesné informace. Pro zpracování je vyžadována jejich vektorizace. Řešeny jsou úlohy segmentace mapové oblasti, průsečíků mapové mřížky a segmentace stavebních bloků.This competition consists in solving several challenges which arise during the processing of images of historical maps. In the Western world, the rapid development of geodesy and cartography from the 18th century resulted in massive production of topographic maps at various scales. City maps are of utter interest. They contain rich, detailed, and often geometrically accurate representations of numerous geographical entities. Recovering spatial and semantic information represented in old maps requires a so-called vectorization process. Vectorizing maps consists in transforming rasterized graphical representations of geographic entities (often maps) into instanced geographic data (or vector data), that can be subsequently manipulated (using Geographic Information Systems). This is a key challenge today to better preserve, analyze and disseminate content for numerous spatial and spatio-temporal analysis purpose

A GIS reconstruction of the Cassini "Carte de France" sheet No. 52

The Cassini Carte de France provides a detailed description of French territory in the mid-18th century. This dataset is the result of an experiment conducted on map sheet number 52, centered on the city of Clermont-Ferrand in France. The goal was to digitise the geographical content of the map in a comprehensive way for two purposes: (1) to build a large-scale vector geographical database on the space of the 18th century and (2) to thoroughly investigate the map to carry out detailed critical analysis. This resulted in the creation of a renewed version of sheet 52. A renewed map (enlarged to a scale of 1:69000) mimicking the original style has been built from the extracted vector geographical data. This digital map is supplemented with an index of all the places it contains, for an easier reading. This dataset is composed of an archive containing: - all vector geographical data extracted from geo-referenced plate number 52; - the QGIS project to create the digital map; - the sources of a poster presented at International Cartographic Conference in 2019; - the sources of the full version of the digital map (with legend and title) and its index