Portrayal Specifications

USGS US Topo Product Standard, https://pubs.usgs.gov/tm/tm11b2/downloads/tm11b2_v2.pdf

German AdV, https://www.adv-online.de/GeoInfoDok/Signaturenkataloge/AAA-Signaturenkatalog-2.1-ATKIS/

Ordnance Survey Open Zoomstack / OS MasterMap, https://github.com/OrdnanceSurvey/OS-Open-Zoomstack-Stylesheets/tree/master

International Hydrographic Organization (IHO) S-52, https://iho.int/uploads/user/pubs/standards/s-52/S-52%20Edition%206.1.1%20-%20June%202015.pdf

Multinational Geospatial Co-production Program (MGCP), https://portal.dgiwg.org/files/10819

Joint Command & Control Symbology, http://everyspec.com/MIL-STD/MIL-STD-2000-2999/MIL-STD-2525_20727/

International Civil Aviation Organization (ICAO) Annex 4 - Aeronautical Charts, https://store.icao.int/en/annexes/annex-4

Geoscience Australia Topographic Data and Map Specifications - Annex S for Symbol Dictionary, https://www.ga.gov.au/mapspecs/topographic/v6/useofspecifications.html

Canadian Chart 1 Symbols, https://www.charts.gc.ca/publications/chart1-carte1/index-eng.html