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            <gco:CharacterString>**Attention: there is a new version of this product (Pre-CanLaD v2)**
Pre-CanLaD v2 can be found here: 
https://doi.org/10.23687/8d49698f-40f9-40da-b097-a3f4c90adf5a

This data product aimed to extend the existing pre-1985 disturbance history record by mapping wildfire, harvest, and insect outbreaks in Canadian forests between 1965 and 1984. Our geospatial data processing methodology relied on multi-layer perceptrons (MLP) trained on spectral recovery signatures to map and age these disturbances. Specific years were not assigned to insect outbreaks due to the lack of dependable training and validation data. In order to provide a more accurate data product that is compatible with existing datasets (e.g. provincial forest inventories), we used these reliable, but incomplete datasets to correct our predictions of disturbance type and year whenever they were available. Coupled with the updated Canada Landsat Disturbance (CanLaD) data product (Guindon et al. 2017), we are thus able to obtain a pan-Canadian 30m resolution disturbance history record from 1965 until 2023. The full description of the methodology and the exhaustive validation analyses are described in detail in Correia et al. (2024).

The following limitations should be taken into account when using this dataset:
•   It is recommended to group disturbance age predictions into age classes, as this should reduce the noise present in the disturbance age estimation models.
•   Fire-harvest misclassification seems to be particularly common in transition zones like the southern edge of the Boreal Shield, where fires and harvest are both relatively common. 
•   There seems to be an overestimation of 1965 fires due to a misclassification of burnt areas older than 1965 in northern, less productive areas as belonging to the beginning of our time series. 
•   We likely detected mostly high-severity burnt areas that depict complete mortality, since the faster recovery of low-severity burns makes them more challenging to detect. 
•   Insect outbreak detections were mostly associated with the historic eastern spruce budworm outbreak of the 1970s. Even though pixel-level insect disturbance year was not predicted, realistic estimates can be obtained by cross-checking our data product with historic reports. 

The following raster layers are available:
•   canlad_1965_1984_disturbanceType: Estimated disturbance type 
   o	2 = Fire
   o	3 = Harvest
   o	4 = Insect
•   canlad_1965_1984_disturbanceYear: Estimated disturbance year
   o	Numeric value from 1965 to 1984
•   canlad_1965_1984_correctionMask: Raster indicating which predictions have been corrected with external datasets
   o	0 = Unconfirmed disturbance
   o	1 = Confirmed fire
   o	2 = Confirmed harvest

Please cite this data product as:
Correia, D. L. P., L. Guindon, and M. A. Parisien. 2024. Canada-wide Landsat-based 30-m resolution product of disturbance detection prior to 1984. https://doi.org/10.23687/660b7c6a-cdec-4c02-90c7-d63e91825c42 

References:
Correia, D. L. P., L. Guindon, and M. A. Parisien. 2024. Extending Canadian forest disturbance history maps prior to 1985. Ecosphere [in press].

Guindon, L., P. Villemaire, R. St-Amant, P.Y. Bernier, A. Beaudoin, F. Caron, M. Bonucelli and H. Dorion. 2017. Canada Landsat Disturbance (CanLaD): a Canada-wide Landsat-based 30-m resolution product of fire and harvest detection and attribution since 1984. https://doi.org/10.23687/add1346b-f632-4eb9-a83d-a662b38655ad</gco:CharacterString>
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                  <gmd:LocalisedCharacterString locale="#fra">**Attention: Il existe une version plus récente de ce produit (Pré-CanLaD v2)**
Pour plus d'information sur Pré-CanLaD v2, voir: 
https://doi.org/10.23687/8d49698f-40f9-40da-b097-a3f4c90adf5a

Ce produit de données vise à étendre l'historique des perturbations existant avant 1985 en cartographiant les feux de forêt, les coupes forestières et les dommages causés par les insectes dans les forêts canadiennes entre 1965 et 1984. La méthodologie de traitement des données géospatiales repose sur des perceptrons multicouches (MLP) entraînés sur des signatures de récupération spectrale afin de cartographier et dater ces perturbations. En raison du manque de données d'entraînement et de validation fiables, les années exactes des zones affectées par les insectes n'ont pas été identifiées. Afin de fournir un produit de données plus précis et compatible avec les ensembles de données existants, plus fiables mais incomplets (par exemple, les inventaires forestiers provinciaux), ceux-ci ont été utilisés, lorsque disponibles, afin de corriger les prédictions de type et d'année de perturbation. Lorsqu'utilisé conjointement au produit de données Canada Landsat Disturbance (CanLaD) mis à jour (Guindon et al. 2017), il est possible d'obtenir l'historique des perturbations à résolution de 30 m pour l'ensemble du Canada de 1965 à 2023. La description complète de la méthodologie et des analyses de validation est détaillée dans Correia et al. (2024).

Les limitations suivantes doivent être prises en compte lors de l'utilisation de cet ensemble de données :
•   Il est recommandé de regrouper les prédictions d'âge des perturbations en classes d'âge, ce qui permet de réduire le bruit présent dans les modèles d'estimation de l'âge des perturbations.
•   Une confusion dans l'identification des feux et des coupes est possible dans les secteurs, tel qu'au sud du bouclier boréal, où la présence simultanée de ces types de perturbations est courante.
•   La mauvaise classification des zones brûlées avant 1965, dans les zones forestières improductive du nord, semble avoir causé une surestimation des feux de 1965, en raison de leur présence au début de la série de données temporelles qui a servi à entrainer le modèle.
•   Il est probable que ce soit surtout les feux sévères, qui causent une mortalité complète, qui ont été principalement détectés. La rapidité de la récupération après feu à faible sévérité rend la détection plus difficile.
•   Les détections des zones affectées par les insectes peuvent être principalement associées à l'épidémie historique de la tordeuse des bourgeons de l'épinette des années 1970. Même si, au niveau des pixels, l'année de perturbation due aux insectes n'a pas été prédite, des estimations réalistes peuvent être obtenues en croisant notre produit de données avec des rapports historiques.

Les couches de données matricielles suivantes sont disponibles :
•   canlad_1965_1984_disturbanceType : Type de perturbation prédite 
   o 2 = Feu
   o 3 = Coupe
   o 4 = Insecte
•   canlad_1965_1984_disturbanceYear : Année de perturbation prédite
   o Valeur numérique de 1965 à 1984
•   canlad_1965_1984_correctionMask : Couche matricielle indiquant quelles prédictions ont été corrigées avec des ensembles de données externes
   o 0 = Perturbation non confirmée
   o 1 = Feu confirmé
   o 2 = Coupe confirmée

Veuillez citer ce produit de données comme suit :
Correia, D. L. P., L. Guindon, and M. A. Parisien. 2024. Canada-wide Landsat-based 30-m resolution product of disturbance detection prior to 1984. https://doi.org/10.23687/660b7c6a-cdec-4c02-90c7-d63e91825c42 

References:
Correia, D. L. P., L. Guindon, and M. A. Parisien. 2024. Extending Canadian forest disturbance history maps prior to 1985. Ecosphere [in press].

Guindon, L., P. Villemaire, R. St-Amant, P.Y. Bernier, A. Beaudoin, F. Caron, M. Bonucelli and H. Dorion. 2017. Canada Landsat Disturbance (CanLaD): a Canada-wide Landsat-based 30-m resolution product of fire and harvest detection and attribution since 1984. https://doi.org/10.23687/add1346b-f632-4eb9-a83d-a662b38655ad</gmd:LocalisedCharacterString>
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      </gmd:MD_Distribution>
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</gmd:MD_Metadata>