Parent Layer: Unbuffered Human Disturbance 2020 (ECCC)

Name: Linear Human Disturbance 2020

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Description: Linear (line) human (anthropogenic) disturbance features mapped by ECCC in 2020 based on features visible on 1:50,000 Landsat imagery, clipped to the 2016 ENR, GNWT version of the NT1 boreal caribou rangeAnthropogenic disturbance footprint within boreal caribou ranges across Canada - As interpreted from 2020 Landsat satellite imagery as part of a scientific assessment of critical habitat for boreal woodland caribou (Environment Canada 2011, see full reference in accompanying documentation), Environment Canada's Landscape Science and Technology Division was tasked with providing detailed anthropogenic disturbance mapping across known caribou ranges. This data allowed researchers to better understand the attributes that have a known effect on caribou population persistence. The mapping process was established to create a nationally consistent, reliable and repeatable geospatial dataset that followed a common methodology. The methods developed were focused on mapping disturbances at a specific point of time, and were not designed to identify the age of disturbances, which can be of particular interest for disturbances that can be considered non-permanent, for example cutblocks. The resultant datasets were used for caribou resource selection function, habitat modeling, and assess overall disturbance levels on each caribou ranges. Anthropogenic disturbances within 51 caribou ranges across Canada were mapped. The ranges were defined by individual Provinces and Territories across Canada. Disturbances were mapped across these ranges using 2008-2010 Landsat-5 satellite imagery to provide the most up to date data possible. Within the context of this project, anthropogenic disturbance was defined as any human-caused disturbance to the natural landscape that could be visually identified from Landsat imagery at a viewing scale of 1:50,000. A minimum mapping unit (MMU) of 2 ha or approximately 22 contiguous Landsat pixels was selected. Each disturbance feature type was represented in the database by a line or polygon depending on their geometric description. Polygonal disturbances included: cutblocks, mines, reservoirs, built-up areas, well sites, agriculture, oil and gas facilities, as well as unknown features. Linear disturbances included: roads, railways, powerlines, seismic exploration lines, pipelines, dams, air strips, as well as unknown features. For each anthropogenic feature type, a clear description was established (see Appendix 7.2 of the science assessment) to maintain consistency in identifying the various disturbances in the imagery by the different interpreters. Various ancillary vector datasets were used as aids in detecting, classifying and digitizing disturbances on the Landsat imagery (a table listing these datasets and their sources has been included in a separate file). Ancillary data was used to guide interpretation and feature labelling since the ancillary data was often variable across the country in terms of completeness as well as scale. As a result, features were only digitized if they were visible in the Landsat imagery at a viewing scale of 1:50,000. A 2nd interpreter quality control phase was carried out to ensure high quality, complete and consistent data collection. This dataset provided an update to the previous 2008-2010, and 2015 mapping efforts. 2020 Landsat 8 imagery was used, and features were added to the original database; however, features previously digitized that were no longer visible were not removed. A 2nd interpreter was again used for quality assurance purposes.For a more detailed description of the methods seePasher, J., E. Seed, and J. Duffe. 2013. Development of a boreal ecosystem anthropogenic disturbance layers for Canada based on 2008 to 2010 Landsat imagery. Canadian Journal of Remote Sensing 39(1): 42-58

Copyright Text: Source: Environment and Climate Change Canada. https://open.canada.ca/data/en/dataset/63e1cda6-debe-4b9b-b075-3666443e30b4 Pasher, J., E. Seed, and J. Duffe. 2013. Development of a boreal ecosystem anthropogenic disturbance layers for Canada based on 2008 to 2010 Landsat imagery. Canadian Journal of Remote Sensing 39(1): 42-58 Edited by R.Abernethy, Wildlife Division, ENR, GNWT -The original dataset was clipped to the 2012 and 2022 versions of NT1. These datasets needed to be merged, then clipped to the official 2016 NT1 boundary.

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