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Service Description: The original disturbance mapping was conducted on 30-m resolution Landsat-5 imagery for 2008-2010. Since then, anthropogenic disturbances within the 51 caribou ranges (Federal RS 2012) across Canada were remapped every five years, using the 2015 and 2020 Landsat-8 imagery, to provide the most up to-date data possible. Interpretation was carried out based on the most recent cloud-free imagery available up to mid fall for a given year. Each disturbance feature type was represented in the database by a line or polygon depending on their geometric description. Linear disturbances included: roads, railways, powerlines, seismic exploration lines, pipelines, dams, air strips, as well as unknown features. Polygonal disturbances included: cut blocks, mines, built-up areas, well sites, agriculture, oil and gas facilities, as well as unknown features.
For each type of anthropogenic disturbance, a clear description was established (Appendix 7.2 of the science assessment) to maintain consistency in identifying the various disturbances in the imagery by the different interpreters. Features were only digitized if they were visible in the Landsat imagery at the prescribed viewing scale of 1:50,000. The data collection process accelerated considerably with the advancement of technology however the mapping protocol stayed consistent throughout the years. For the 2020 update, harvest polygons (Ref: NRCan-CFS NTEMS; Wulder 2020) were added to the database prior to interpretation, to speed up the data collection. Post interpretation, a 2nd interpreter quality control phase was carried out to ensure high quality, complete and consistent data collection. The attached dataset for linear and polygonal data, includes disturbances from 2010 that were visible in 2015 along with newly identified disturbances in 2015 and 2020. Each disturbance feature was marked with the study year it was first identified in. Subsequently, the vector data (including the lines and polygons) for each of the 51 caribou ranges, were buffered by a 500-metre radius, representing their extended zone of impact upon boreal caribou herds. In addition, forest fire polygons for the past forty years (CNFDB 1981-2020) were merged into the buffered anthropogenic footprint in order to create an overall disturbance footprint.
Map Name: DisturbanceFootprintUpdatedFor2020
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Description: The original disturbance mapping was conducted on 30-m resolution Landsat-5 imagery for 2008-2010. Since then, anthropogenic disturbances within the 51 caribou ranges (Federal RS 2012) across Canada were remapped every five years, using the 2015 and 2020 Landsat-8 imagery, to provide the most up to-date data possible. Interpretation was carried out based on the most recent cloud-free imagery available up to mid fall for a given year. Each disturbance feature type was represented in the database by a line or polygon depending on their geometric description. Linear disturbances included: roads, railways, powerlines, seismic exploration lines, pipelines, dams, air strips, as well as unknown features. Polygonal disturbances included: cut blocks, mines, built-up areas, well sites, agriculture, oil and gas facilities, as well as unknown features.
For each type of anthropogenic disturbance, a clear description was established (Appendix 7.2 of the science assessment) to maintain consistency in identifying the various disturbances in the imagery by the different interpreters. Features were only digitized if they were visible in the Landsat imagery at the prescribed viewing scale of 1:50,000. The data collection process accelerated considerably with the advancement of technology however the mapping protocol stayed consistent throughout the years. For the 2020 update, harvest polygons (Ref: NRCan-CFS NTEMS; Wulder 2020) were added to the database prior to interpretation, to speed up the data collection. Post interpretation, a 2nd interpreter quality control phase was carried out to ensure high quality, complete and consistent data collection. The attached dataset for linear and polygonal data, includes disturbances from 2010 that were visible in 2015 along with newly identified disturbances in 2015 and 2020. Each disturbance feature was marked with the study year it was first identified in. Subsequently, the vector data (including the lines and polygons) for each of the 51 caribou ranges, were buffered by a 500-metre radius, representing their extended zone of impact upon boreal caribou herds. In addition, forest fire polygons for the past forty years (CNFDB 1981-2020) were merged into the buffered anthropogenic footprint in order to create an overall disturbance footprint.
Copyright Text: National Wildlife Research Centre's Geomatics Lab, Science & Technology, Environment and Climate Change Canada
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Title: DisturbanceFootprintUpdatedFor2020
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Comments: The original disturbance mapping was conducted on 30-m resolution Landsat-5 imagery for 2008-2010. Since then, anthropogenic disturbances within the 51 caribou ranges (Federal RS 2012) across Canada were remapped every five years, using the 2015 and 2020 Landsat-8 imagery, to provide the most up to-date data possible. Interpretation was carried out based on the most recent cloud-free imagery available up to mid fall for a given year. Each disturbance feature type was represented in the database by a line or polygon depending on their geometric description. Linear disturbances included: roads, railways, powerlines, seismic exploration lines, pipelines, dams, air strips, as well as unknown features. Polygonal disturbances included: cut blocks, mines, built-up areas, well sites, agriculture, oil and gas facilities, as well as unknown features.
For each type of anthropogenic disturbance, a clear description was established (Appendix 7.2 of the science assessment) to maintain consistency in identifying the various disturbances in the imagery by the different interpreters. Features were only digitized if they were visible in the Landsat imagery at the prescribed viewing scale of 1:50,000. The data collection process accelerated considerably with the advancement of technology however the mapping protocol stayed consistent throughout the years. For the 2020 update, harvest polygons (Ref: NRCan-CFS NTEMS; Wulder 2020) were added to the database prior to interpretation, to speed up the data collection. Post interpretation, a 2nd interpreter quality control phase was carried out to ensure high quality, complete and consistent data collection. The attached dataset for linear and polygonal data, includes disturbances from 2010 that were visible in 2015 along with newly identified disturbances in 2015 and 2020. Each disturbance feature was marked with the study year it was first identified in. Subsequently, the vector data (including the lines and polygons) for each of the 51 caribou ranges, were buffered by a 500-metre radius, representing their extended zone of impact upon boreal caribou herds. In addition, forest fire polygons for the past forty years (CNFDB 1981-2020) were merged into the buffered anthropogenic footprint in order to create an overall disturbance footprint.
Subject: This map represents the latest 5-year update (using Landsat-8 2020 imagery) to the anthropogenic disturbances identified for 2010 and 2015.
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Keywords: anthropogenic disturbance,boreal forest,species at risk,caribou,habitat,mapping,landcover,landuse,perturbation,disturbance footprint
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