Historical forest airborne imagery corresponds to an annual collection of orthophotographs, acquired by aerial overview in order to meet the needs of the ecoforest inventory of southern Quebec (IEQM) and the global forest planning cycle (operational forest planning, forest planning, forest monitoring and forest activity controls). These images serve, among other things, to feed the process of photo-interpretation and production of the ecoforest map essential for sustainable forest management, as well as the overall forest planning cycle. Historical orthophotographs are assembled into mosaics. Each mosaic groups together the images from an acquisition project that have the same shooting year, the same spatial resolution and the same spectral bands. Mosaics have been produced since 2002 for ecoforest inventory and since 2004 for planning, monitoring and control images. The spatial resolution is generally 20, 21 or 30 cm (with a few exceptions of 50 and 63 cm) for the images that make up the mosaics of the ecoforest inventory, while it is much more variable for the planning, monitoring and control images (from 4 to 150 cm). Spectral bands and colors of images vary: black and white (panchromatic [PAN]), infrared (IRP), or natural (red, green, and blue colors [RGB]). The images used to produce the mosaics are spread over almost all of Quebec, south of the 52nd parallel. They are acquired in a cycle of about 10 years for the IEQM and annually for the needs of the global forest planning cycle. Note that imagery acquired through partnerships has been excluded due to their more restrictive broadcast license. The orthophotography mosaics of the ecoforest inventory are available for download in three formats depending on the territory (JPEG 2000, ECW and GeoTIFF) and are also accessible for visualization using a web mapping service (WMTS). Note that the orthophotography mosaics for planning, monitoring and controls are only available for viewing and not for download. **This third party metadata element was translated using an automated translation tool (Amazon Translate).**

Created in the late 1980s, the Network for the Study and Monitoring of Forest Ecosystems (RESEF) is a network for the long-term monitoring of natural forests, including more than forty stations spread across Quebec. It aims to characterize the main components of these forest ecosystems, to monitor their evolution and to study their functional interactions. Each station consists of a sample plot of 0.5 hectares in deciduous stands and 0.25 hectares in coniferous stands. In order to carry out a detailed monitoring of the characteristics of the vegetation, these plots are subdivided into plots of 100 m2 (10 m × 10 m). Each tree with a diameter at chest height (DHP, measured 1.3 m from the ground) greater than or equal to 11 mm present in the plot is numbered and georeferenced, then its DHP and its height are measured. The dimensions of the crown are noted for trees whose DHP is greater than or equal to 91 mm, and the regeneration is inventoried. Each plot is surrounded by a 100 m protection zone, in which the physicochemical properties of soils and foliage are measured. Analysis of growth rings complete the follow-up. Since 1986, data has been collected at regular intervals of 5 or 10 years according to standardized protocols. **This third party metadata element was translated using an automated translation tool (Amazon Translate).**

Following the execution of forest work, the holders must, each year, prepare and submit to the Minister a Technical and Financial Activity Report (RATF) for each of the elements of the authorized annual programming (PRANA). The technical and financial activity report includes several geometric entities allowing the verification of development works on public forest territory. Here is the list: forest roads, point infrastructure, drainage completed, drainage completed, sample plot, intervention polygons, bridge and culvert, reforested species, intervention monitoring results, intervention sector, intervention sampling unit, intervention follow-up sampling unit.**This third party metadata element was translated using an automated translation tool (Amazon Translate).**