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            <gco:CharacterString>**1. Overview**

Pre-CanLaD v2 updates Canada's 1965-1984 forest disturbance history dataset initially published by Correia et al. (2024) with enhanced detection methods and improved temporal accuracy and coverage.

**2. Key Updates in pre-CanLaD v2**


**2.1. Enhanced Detection**

- Fractional land-cover change analysis identifies post-disturbance forest regeneration using 1985-2020 vegetation cover differences
- Dual detection approach combines automated polygon-based classification with manual photo-interpretation
- Incorporates National Burn Area Composite (NBAC; Skakun et al., 2022) 1972-1984 fire perimeters for improved fire year attribution

**2.2. Detection Results**

See **Table 1 in the update report**, available in the download section below. This table presents the total disturbed areas, by disturbance type, for the periods 1950–1964 and 1965–1984.

The “New detection” column represents disturbed areas for which no reliable previous data were available. The “Previously recorded” column represents disturbed areas already documented in the datasets described in Table 3 of Correia et al. (2024) and NBAC, for which the predicted disturbance year was subsequently adjusted.

**3. Dataset description**

   Four raster layers available:

- preCanLaD_disturbanceType_v2_20251126.tif 
    - Pixel values are disturbance type:
        - 2 = Fire
        - 3 = Harvest
        - 4 = Insect
- preCanLaD_disturbanceYear_v2_20251126.tif 
    - Pixel values are disturbance year:
        - 1950-1984 = years
        - 999 = unknown (user should convert this value to 1955)
- preCanLaD_correctionMask_v2_20251126.tif 
    - Pixel values are data provenance codes:
        - 0 = Pre-CanLaD-only disturbance 
        - 1 = Confirmed fire (manual or confirmed by pre-CanLaD v1 in the original publication) 
        - 11 = Canadian National Fire Database (CNFDB) corrected fire 
        - 12 = NBAC-corrected fire
        - 2 = Confirmed harvest 
- preCanLaD_updateMask_v2_20251126.tif 
    - Pixel values are version change indicator:
        - 1 = v1 retained
        - 2 = v2 new/updated

**4. Key Improvements**

- Improved fire-harvest discrimination through provincial harvest polygon integration
- Hierarchical dating system prioritizes NBAC &gt; CNFDB polygons &gt; CNFDB points &gt; model-based dates &gt; manual interpretation and unknown dates
- Better harmonization with current historic disturbance records
- Quality controls: 11-pixel minimum patch size, 1985-2020 disturbance masking

**5. Known Limitations**

- Some temporal uncertainty remains; grouping disturbance years into age classes can help mitigate its effects.High-severity burns preferentially detected; low-severity fires may be missed, along with fires in non-forested and open forest areas with low forest recovery rates
- Some fire-harvest confusion in transition zones
- Harvest detections may be biased toward provinces with publicly available forest inventories because the pre-CanLaD v2 method relies on these inventories to identify additional harvested areas
- No pixel-level dates for insect outbreaks

**6. Data download**

The data can be downloaded from the FTP server (ftp.maps.canada.ca/pub/nrcan_rncan/Forests_Foret/canada_disturbances_1965to1984/v2/), referenced in the “Data and Resources” section, using a browser download manager, such as DownThemAll, or an external client such as FileZilla.

**7. Dataset citation**

- Guindon L., Correia D.L.P. and S. Brisson. 2026. Pre-CanLaD v2: Canada Landsat Disturbance (CanLaD) 30-m resolution disturbance detection prior to 1984. https://doi.org/10.23687/8d49698f-40f9-40da-b097-a3f4c90adf5a

**8. Reference**

- Correia, David L., Luc Guindon, and Marc-André Parisien. 2024. “Extending Canadian Forest Disturbance History Maps Prior to 1985.” Ecosphere 15 (8): e4956.
- Natural Resources Canada. 2023. Canadian National Fire Database Natural Resources Canada. Edmonton: Canadian Forest Service, Northern Forestry Centre. https://cwfis.cfs.nrcan.gc.ca. 
- Skakun, R., G. Castilla, J. Metsaranta, E. Whitman, S. Rodrigue, J. Little, K. Groenewegen, and M. Coyle. 2022. “Extending the National Burned Area Composite Time Series of Wildfires in Canada.” Remote Sensing 14: 3050.

___
For detailed methodology, see download links, file “Pre-CanLaD_v2_Update_report_EN.pdf”</gco:CharacterString>
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                  <gmd:LocalisedCharacterString locale="#fra">**1. Aperçu**

La version 2 de pré-CanLaD met à jour le jeu de données sur l'historique des perturbations forestières au Canada de 1965 à 1984, initialement publié par Correia et al. (2024), avec des méthodes de détection améliorées et une précision temporelle accrue.

**2. Nouveautés**


**2.1. Détection améliorée**

- L'analyse des changements fractionnels du couvert terrestre identifie la régénération forestière post-perturbation en utilisant les différences de couvert végétal entre 1985 et 2020
- Une approche de détection en deux volets combine une classification automatisée basée sur des données polygonales avec une photo-interprétation manuelle
- Intègre les périmètres d'incendie de 1972 à 1984 du Composite national des superficies brûlées (NBAC; Skakun et al., 2022) pour une meilleure attribution de l'année d'incendie

**2.2. Résultats de détection**

Voir le **Tableau 1 du rapport de mise à jour**, disponible dans la section de téléchargement ci-dessous. Ce tableau présente les superficies totales perturbées, par type de perturbation, pour les périodes 1950–1964 et 1965–1984.

La colonne « Nouvelles détections » correspond aux superficies perturbées pour lesquelles aucune donnée fiable n’était disponible auparavant. La colonne « Perturbations déjà enregistrées » correspond aux superficies perturbées déjà consignées dans les jeux de données décrits au tableau 3 de Correia et al. (2024) et dans le CNSB, pour lesquelles l’année de perturbation prédite a été ajustée en conséquence.

**3. Description du jeu de données**

    Quatre couches matricielles disponibles :

- preCanLaD_disturbanceType_v2_20251126.tif 
    - Valeur des pixels correspond au type de perturbation:
        - 2 = Feu
        - 3 = Récolte
        - 4 = Insecte
- preCanLaD_disturbanceYear_v2_20251126.tif 
    - Valeur des pixels correspond à l'année de perturbation:
        - 1950-1984 = Années
        - 999 = inconnue (il est suggéré que l'utilisateur convertisse cette valeur à 1955)
- preCanLaD_correctionMask_v2_20251126.tif 
    - Valeur des pixel identifie la provenance des données:
        - 0 = Perturbation non confirmée
        - 1 = Feu confirmé (manuel ou confirmé par pré-CanLaD version 1 dans la publication originale)
        - 11 = Feu corrigé par la Base nationale de données sur les feux de forêt du Canada (BNDFC)
        - 12 = Feu corrigé par le NBAC
        - 2 = Coupe forestière confirmée
- preCanLaD_updateMask_v2_20251126.tif 
    - Valeur des pixels est un indicateur de changement de version: 
        - 1 = v1 conservée
        - 2 = v2 nouvelle/mise à jour

**4. Améliorations clés**

- Amélioration de la discrimination feu-coupe forestière grâce à l'intégration de polygones de récolte provinciaux
- Système de datation hiérarchique priorisant NBAC &gt; polygones BNDFC &gt; points BNDFC &gt; dates basées sur des modèles &gt; dates manuelles et inconnues
- Meilleure harmonisation avec les jeux de données de perturbation historiques existants
- Contrôles de qualité : taille minimale de perturbation de 11 pixels, masquage des perturbations entre 1985 et 2020

**5. Limites connues**

- Regrouper les années de perturbation en classes d'âge pour réduire l'incertitude temporelle
- Détection préférentielle des feux de forte intensité; les feux de faible intensité peuvent être manqués, ainsi que les feux dans les zones non forestières et les forêts ouvertes avec de faibles taux de récupération forestière
- Certaines confusions feu-récolte dans les zones de transition
- Les détections de récolte peuvent être biaisées vers les provinces disposant d'inventaires forestiers accessibles au public, car la méthode de la version 2 s'appuie sur ces inventaires pour identifier des zones récoltées supplémentaires
- Aucune date au niveau du pixel pour les épidémies d'insectes

**6. Téléchargement des données**

Les données sont disponibles sur le serveur FTP (ftp.maps.canada.ca/pub/nrcan_rncan/Forests_Foret/canada_disturbances_1965to1984/v2/) et peuvent être téléchargées à l’aide d’une extension de téléchargement pour navigateur, telle que downThemAll, ou d’un client FTP externe, tel que FileZilla.

**7. Citation pour ce jeux de données**

- Guindon L., Correia D.L.P. and S. Brisson. 2026. Pre-CanLaD v2: Canada Landsat Disturbance (CanLaD) 30-m resolution disturbance detection prior to 1984. https://doi.org/10.23687/8d49698f-40f9-40da-b097-a3f4c90adf5a

**8. Références**

- Correia, David L., Luc Guindon, and Marc-André Parisien. 2024. “Extending Canadian Forest Disturbance History Maps Prior to 1985.” Ecosphere 15 (8): e4956.
- Natural Resources Canada. 2023. Canadian National Fire Database Natural Resources Canada. Edmonton: Canadian Forest Service, Northern Forestry Centre. https://cwfis.cfs.nrcan.gc.ca. 
- Skakun, R., G. Castilla, J. Metsaranta, E. Whitman, S. Rodrigue, J. Little, K. Groenewegen, and M. Coyle. 2022. “Extending the National Burned Area Composite Time Series of Wildfires in Canada.” Remote Sensing 14: 3050.

___
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