1/20,000 scale topographic maps

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Note that topographic maps at a scale of 1/20,000 are no longer updated. For the last update date, see the [metadata] (ftp://transfert.mern.gouv.qc.ca/public/diffusion/RGQ/Documentation/BDTQ/Metadonnees_Topo-20K.xls). The reference map data is now based on a continuous information layer approach: * [AQNetwork+] (https://www.donneesquebec.ca/recherche/fr/dataset/adresses-quebec) * [Quebec Hydrographic Network Geobase (QHRM)] (https://www.donneesquebec.ca/recherche/dataset/grhq) * [Administrative splits at scale of 1/20,000 (SQ) DA)] (https://www.donneesquebec.ca/recherche/fr/dataset/decoupages-administratifs) * [Models Regional coherent hydro terrain numerical (NTM)] (https://www.donneesquebec.ca/recherche/fr/dataset/modeles-numerique-de-terrain-hydro-coherents-a-l-echelle-regionale) * Topographic maps at a scale of 1/20,000 are the official cartographic base of the Government of Quebec. They cover almost the entire territory south of the 52nd parallel. The data are extracted from aerial photographs at a scale of 1/40,000 taken at an altitude of 6,300 metres. They offer an accuracy of approximately four meters in planimetry. In hypsometry, it is about two meters for the quoted points and about five meters for the level curves. Each file covers an area of approximately 250 km2. The main components are: * Hydrography (lakes, rivers, streams, swamps, etc.) . Vegetation (forests, peatlands, nurseries, orchards, etc.) . Human constructions: * transport infrastructure (roads, bridges, airports, etc.); * buildings (mobile homes, silos, greenhouses, etc.); * equipment (docks, power transmission lines, etc.) * Designated areas (golf courses, borrowing benches, etc.) * Relief (level curves are usually at an equidistance of ten meters and in some cases they may vary between eight and twenty metres).

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