Le SMC (Service météorologique du Canada) recueille des données atmosphériques depuis 1850 et continue de le faire. Pour collecter les données atmosphériques, on mesure les vitesses des vents, la pression atmosphérique, la vitesse de déplacement du système et l'information sur les coordonnées de l'emplacement des mesures, de même que la date et l'heure à toutes les six heures. Ces données sont classées par catégorie de perturbation et chaque perturbation se voit attribuer un nom et une classification d'après la vitesse maximale de ses vents, à toutes les lectures effectuées aux six heures. Ce service fournit toutes les données de mesure des perturbations disponibles.

__The link: *Access the data directory* is available in the section*Dataset Description Sheets; Additional Information*__. The mapping of insect epidemics, windfalls (trees knocked down by the wind) and ice is produced as part of the ecoforestry inventory of southern Quebec in order to maintain an up-to-date portrait of the forest. It covers the commercial territory of public and private forests in Quebec. The minimum mapping area is 0.1 ha. This portrait is useful, among other things, for evaluating the intensity and extent of damage associated with insects, windfalls and ice. In each case, the mapping represents the loss of forest cover in the form of disturbances ranging from severe (over 75% of dead trees) to slight disturbances (from 25 to 75% of dead trees). The disturbances in this map date back to the beginning of the century (when information is available) to the present day. They are the result of collaboration between the Directorate of Forest Protection and the Directorate of Forest Inventories. The outlines come from forest inventories (first and second decennial inventories) and ecoforestry inventories (third and fourth decennial inventories). Mortality is dated using defoliation layers from the Directorate for Forest Protection. For the epidemic of TBE (spruce budworm), mortality is considered to occur after a succession of five years or more of severe or moderate defoliation. In the case of the surveyor, a single year is enough to decimate a forest stand. The other elements in the layer are dated using LANDSAT imagery, sample plots, and archival documents.**This third party metadata element was translated using an automated translation tool (Amazon Translate).**

__The link: *Access the data directory* is available in the section*Dataset Description Sheets; Additional Information*__. The updated ecoforest map (formerly “with disturbances”) is the result of the interpretation of aerial photographs and control points in the field as part of the ecoforest inventory of southern Quebec. This mapping presents the various forest and ecological characteristics of the forest territory and corresponds to the portrait of the forest up to the year in which the aerial photograph was taken (mapping cycle of about 10 years). Next, the outlines and nature of recent disturbances (forest interventions, fires and other disturbances) are then integrated annually. The fifth mapping cycle has been under way since 2015. This map covers almost all of the territory south of the 52nd parallel of Quebec's public and private forest. It is distributed by map sheet at a scale of 1/250,000. The minimum mapping area is 4 ha for stands and 0.1 ha for disturbances. __Note 1__: The disturbance maps used to update the updated ecoforest map are also distributed separately on Data Quebec. Here is the list of these maps: + [Forest fires] (https://www.donneesquebec.ca/recherche/dataset/feux-de-foret) + [Harvesting and other silvicultural interventions] (https://www.donneesquebec.ca/recherche/dataset/recolte-et-reboisement) + [Epidemics, windfalls and ice storms] (https://www.donneesquebec.ca/recherche/dataset/epidemies-chablis-et-verglas) + [Forest infrastructures] (https://www.donneesquebec.ca/recherche/dataset/infrastructures-en-milieu-forestier) () __Note 2__: Disturbances are prioritized according to the nature of the layer and respect for the chronology of events. Only the last original or partial disturbance is kept in the updated ecoforest map. You should refer to the annual update layers, listed in __Note 1__, to have access to the full history of disturbances.**This third party metadata element was translated using an automated translation tool (Amazon Translate).**