Canada Landsat Disturbance (CanLaD) 2017
This data publication contains a set of files in which areas affected by fire or by harvest from 1984 to 2015 are identified at the level of individual 30m pixels on the Landsat grid. Details of the product development can be found in Guindon et al (2018).
The change detection is based on reflectance-corrected yearly summer (July and August) Landsat mosaics from 1984 to 2015 created from individual scenes developed from USGS reflectance products (Masek et al, 2006; Vermote et al, 2006). Briefly, the change detection method uses a six-year temporal signature centered on the disturbance year to identify fire, harvest and no change. The signatures were derived from visually-interpreted disturbance or no-change polygons that were used to fit a decision tree model.
The method detects about 91% of the areas harvested and 85% of the areas burned across Canada’s forests over the study period, but overestimates areas disturbed in the two initial and mostly in the two final years of the 1985 to 2015 time series. This is caused by the absence of appropriate pre-disturbance and post-disturbance data for the model-based detection and attribution. Disturbance coverage in those four years should therefore be used with caution. As in Guindon et al (2014), the method was designed to minimize commission errors and has a disturbance class attribution success rate of about 98%. The attribution success rate of disturbance year for fire is of about 69% for the exact year and of about 99% when attribution to the following year is also considered as a success. This common one-year lag is mostly due to the use of mid-summer Landsat mosaics for the analysis that will cause spring and fall events of the same year to be attributed to successive years. For example, a fire that occurred in the fall of 2004 (after July and August), will be detected and attributed to 2005, while for a fire that occurred in the spring of 2004 will be detected and attributed to 2004. The presence of clouds and shadows or image availability causes 10% of missing data annually and therefore can too delay the capture of events.
The data provides uniform spatial and temporal information on fire and harvest across all provinces and territories of Canada and is intended for strategic-level analysis. Since no attention was given to other minor disturbances such as mining, road or flooding, the product should not be used for their identification. Finally, calibration datasets were developed for only three major forest pests (mountain pine beetle, eastern spruce budworm and forest tent caterpillar), but were folded within the “no-change” class in order to minimize commission errors for fire and harvest . Less common pests for which validation datasets are hard to develop were not considered and therefore could in rare circumstances generate false fire events.
Considering that area having two (3.3%) to three disturbances (less than 1%) events are not common, only the most recent disturbance is provided, overlapping older disturbances in these rare case.
## Please cite this dataset as:
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
## Scientific article citation:
The creation, validation and limitations of the CanLaD product are described in the Supplementary Material file associated with the following article: Guindon, L.; Bernier, P.Y.; Gauthier, S.; Stinson, G.; Villemaire, P.; Beaudoin, A. 2018. Missing forest cover gains in boreal forests explained. Ecosphere, 9 (1) Article e02094. doi:10.1002/ecs2.2094.
## Cited references:
Masek, J.G., Vermote, E.F., Saleous N.E., Wolfe, R., Hall, F.G., Huemmrich, K.F., Gao, F., Kutler, J., and Lim, T-K. (2006). A Landsat surface reflectance dataset for North America, 1990–2000. IEEE Geoscience and Remote Sensing Letters 3(1):68-72. http://dx.doi.org/10.1109/LGRS.2005.857030.
Vermote, E., Justice, C., Claverie, M., & Franch, B. (2016). Preliminary analysis of the performance of the Landsat 8/OLI land surface reflectance product. Remote Sensing of Environment. http://dx.doi.org/10.1016/j.rse.2016.04.008.
Simple
- Date ( RI_367 )
- 2017-11-09
- Date ( RI_366 )
- 2017
1 (418) 648-5849
http://www.nrcan.gc.ca/forests/research-centres/lfc/13473
- Presentation form
- mapDigital;carteNumérique RI_391
- Status
- completed; complété RI_593
- Maintenance and update frequency
- asNeeded; auBesoin RI_540
- Keywords ( RI_528 )
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- harvesting
- woodland fire
- boreal forest
- forest cover
- remote sensing database
- deforestation
- reforestation
- Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( Theme )
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- Forest fires
- Forestry
- Use limitation
- This product should not be used for the identification of linear disturbances such as roads and rights-of-ways, the detection of new infrastructure such as new buildings or mining sites, or the occurrence of floods. The algorithm has not been trained for these types of disturbances that can then be classified as fire or harvest. In addition, some linear disturbances are finer than a pixel, thus leading to possible classification errors. Finally, small groups of pixels less than one hectare (12 pixels) have been removed.
- Use limitation
- Some severe disturbances such as large windthrow areas may be confused with fire or harvest. In addition, salvage logging operations may have occurred in these areas, contributing to the confusion.
- Use limitation
- The method detects approximately 91% of area harvested and 85% of area burned in Canada's forests during the study period, but overestimates the area disturbed of the first and last two years of the time series due to incomplete pre-disturbance or post-disturbance data, which is necessary for the detection and attribution model. Results for these four years should therefore be used with caution.
- Use limitation
- CanLaD does not assess the permanence of the changes. A harvest activity leading to deforestation, such as an expansion of the agricultural zone, will therefore only be detected as a harvest.
- Use limitation
- Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)
- Access constraints
- license; licence RI_606
- Use constraints
- license; licence RI_606
- Spatial representation type
- grid; grille RI_636
- Metadata language
- fre
- Character set
- utf8; utf8 RI_458
- Topic category
-
- Imagery base maps earth cover
- Environment description
- R (rGdal, raster), utilitaires et librairies GDAL, see5, cubist
- Description
- national coverage at 30m resolution
))
- Begin date
- 2001-05-31
- End date
- 2011-09-30
- Reference system identifier
- http://www.spatialreference.org/ref/sr-org/8787/ / SR-ORG:8787 /
Spatial representation info
- Distribution format
-
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GeoTIF
(
N/A
)
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ESRI REST
(
10.3.1
)
-
WMS
(
1.3.0
)
-
GeoTIF
(
N/A
)
1 (418) 6485849
http://www.nrcan.gc.ca/forests/research-centres/lfc/13473
- OnLine resource
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Year of the latest forest disturbance, 1984 to 2015
(
HTTPS
)
Dataset;TIFF;zxx
- OnLine resource
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Type of the latest forest disturbance (fire=1 or harvest=2), 1984 to 2015
(
HTTPS
)
Dataset;TIFF;zxx
- OnLine resource
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Year of the latest forest disturbance
(
OGC:WMS
)
Web Service;WMS;eng
- OnLine resource
-
Year of the latest forest disturbance
(
OGC:WMS
)
Web Service;WMS;fra
- OnLine resource
-
Type of the latest forest disturbance
(
HTTPS
)
Web Service;WMS;eng
- OnLine resource
-
Type of the latest forest disturbance
(
HTTPS
)
Web Service;WMS;fra
- OnLine resource
-
Canada Landsat Disturbance (CanLaD) 2017
(
HTTPS
)
Web Service;ESRI REST;eng
- OnLine resource
-
Canada Landsat Disturbance (CanLaD) 2017
(
HTTPS
)
Web Service;ESRI REST;fra
- File identifier
- add1346b-f632-4eb9-a83d-a662b38655ad XML
- Metadata language
- eng; CAN
- Character set
- utf8; utf8 RI_458
- Hierarchy level
- dataset; jeuDonnées RI_622
- Date stamp
- 2020-11-18T14:42:34
- Metadata standard name
- North American Profile of ISO 19115:2003 - Geographic information - Metadata
- Metadata standard version
- CAN/CGSB-171.100-2009
1 (418) 648-5849
http://www.nrcan.gc.ca/forests/research-centres/lfc/13473
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Spatial extent
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