Boreal Forest Monitoring (2000 to 2005) Landsat Supplementary Data Landsat ETM+ (28.5 m spatial resolution) data were sampled and classified to derive area estimates of forest cover and change within the biome. Stratified sampling was implemented to enhance precision by allocating greater sampling effort to areas likely to exhibit change. The strata were determined based on the MODIS-derived forest cover loss hotspot map. The biome was partitioned into a sampling frame consisting of square blocks 18.5 km per side. The 500m forest cover loss hotspot map for 2000-2005 was aggregated per block, yielding percent change for each of the blocks within the biome. The stratum boundaries were chosen guided by the cumulative square root frequency rule and the sample size allocated to each change stratum was initially determined by optimal allocation (Cochran, 1977). Stratified sampling design. Stratum MODIS forest loss hotspot fraction Number of blocks sampled 1 0-0.25% 25 2 0.25-1% 25 3 1-6% 25 4 >6% 43 Each Landsat sample block was classified using a supervised decision tree classifier to yield 2000 forest cover and 2000 to 2005 forest clearing areas. Forest was defined as greater than 25% canopy cover and change was measured without regard to forest land use. Sample block imagery and classification results can be viewed from this page. Asia China, Heilongjiang 47.9° N 128.2° E Stratum 3 Mongolia, Govi-Altay 45.4° N 97.5° E Stratum 1 Russia, Aginskiy Buryatskiy Avtonomnyy Okrug 50.8° N 113.1° E Stratum 4 Russia, Amurskaya Oblast' 53.3° N 131.1° E Stratum 1 Russia, Amurskaya Oblast' 54.1° N 126.3° E Stratum 2 Russia, Chitinskaya Oblast' 51.1° N 108.6° E Stratum 3 Russia, Evenkiyskiy Avtonomnyy Okrug 66.9° N 90.8° E Stratum 2 Russia, Irkutskaya Oblast' 52.1° N 104.0° E Stratum 2 Russia, Irkutskaya Oblast' 55.6° N 99.8° E Stratum 3 Russia, Irkutskaya Oblast' 54.8° N 103.2° E Stratum 3 Russia, Irkutskaya Oblast' 53.4° N 105.0° E Stratum 4 Russia, Irkutskaya Oblast' 57.8° N 102.0° E Stratum 4 Russia, Kamchatskaya Oblast' 55.8° N 159.5° E Stratum 2 Russia, Khanty-Mansiyskiy Avtonomnyy Okrug 65.1° N 61.5° E Stratum 1 Russia, Khanty-Mansiyskiy Avtonomnyy Okrug 59.6° N 65.0° E Stratum 2 Russia, Khanty-Mansiyskiy Avtonomnyy Okrug 61.4° N 64.6° E Stratum 2 Russia, Krasnoyarskiy Kray 61.1° N 85.7° E Stratum 2 Russia, Krasnoyarskiy Kray 54.4° N 95.0° E Stratum 2 Russia, Krasnoyarskiy Kray 57.3° N 96.3° E Stratum 3 Russia, Krasnoyarskiy Kray 51.9° N 91.2° E Stratum 3 Russia, Magadanskaya Oblast' 61.3° N 148.8° E Stratum 1 Russia, Respublika Buryatiya 54.6° N 114.9° E Stratum 3 Russia, Respublika Sakha (Yakutiya) 60.9° N 110.9° E Stratum 1 Russia, Respublika Sakha (Yakutiya) 58.8° N 126.1° E Stratum 2 Russia, Respublika Sakha (Yakutiya) 66.4° N 123.5° E Stratum 3 Russia, Respublika Sakha (Yakutiya) 61.9° N 128.7° E Stratum 4 Russia, Respublika Sakha (Yakutiya) 62.6° N 125.8° E Stratum 4 Russia, Respublika Sakha (Yakutiya) 59.4° N 119.7° E Stratum 4 Russia, Respublika Sakha (Yakutiya) 60.4° N 124.4° E Stratum 4 Russia, Respublika Sakha (Yakutiya) 60.4° N 111.2° E Stratum 4 Russia, Respublika Sakha (Yakutiya) 61.9° N 125.2° E Stratum 4 Russia, Respublika Sakha (Yakutiya) 59.8° N 126.5° E Stratum 4 Russia, Respublika Sakha (Yakutiya) 62.1° N 124.1° E Stratum 4 Russia, Respublika Sakha(Yakutiya) 69.8° N 131.7° E Stratum 1 Russia, Respublika Tyva 50.9° N 94.5° E Stratum 4 Russia, Tomskaya Oblast' 58.3° N 81.6° E Stratum 1 Russia, Tomskaya Oblast' 59.9° N 79.0° E Stratum 2 Europe Finland, Lappi 66.8° N 27.7° E Stratum 2 Finland, Oulu 64.9° N 25.8° E Stratum 1 Norway, Hordaland 59.6° N 5.8° E Stratum 3 Norway, Telemark 59.1° N 9.2° E Stratum 1 Russia, Arkhangel'Skaya Oblast' 61.8° N 38.6° E Stratum 3 Russia, Arkhangel'Skaya Oblast' 63.3° N 38.3° E Stratum 3 Russia, Kirovskaya Oblast' 59.3° N 53.0° E Stratum 2 Russia, Kirovskaya Oblast' 59.4° N 50.9° E Stratum 2 Russia, Kirovskaya Oblast' 59.4° N 50.3° E Stratum 4 Russia, Leningradskaya Oblast' 59.8° N 33.6° E Stratum 1 Russia, Respublika Bashkortostan 53.8° N 57.4° E Stratum 1 Russia, Respublika Bashkortostan 52.4° N 58.3° E Stratum 1 Russia, Respublika Bashkortostan 52.1° N 57.6° E Stratum 1 Russia, Respublika Komi 65.6° N 58.3° E Stratum 3 Russia, Respublika Komi 62.1° N 53.6° E Stratum 3 Russia, Tverskaya Oblast' 56.9° N 36.8° E Stratum 1 Sweden, Norrbottens 66.9° N 16.8° E Stratum 2 Sweden, Vasterbottens 64.4° N 19.5° E Stratum 3 North America Canada, Alberta 55.4° N 114.1° W Stratum 2 Canada, Alberta 56.6° N 119.1° W Stratum 3 Canada, Alberta 56.4° N 111° W Stratum 4 Canada, Alberta 56.4° N 114.9° W Stratum 4 Canada, British Columbia 58.1° N 125.3° W Stratum 1 Canada, British Columbia 55.8° N 127.5° W Stratum 2 Canada, British Columbia 51.6° N 122.7° W Stratum 2 Canada, British Columbia 54.6° N 128.1° W Stratum 2 Canada, British Columbia 55.1° N 126.8° W Stratum 2 Canada, British Columbia 54.3° N 129.9° W Stratum 3 Canada, British Columbia 55.3° N 123.8° W Stratum 3 Canada, British Columbia 54.4° N 126.2° W Stratum 3 Canada, British Columbia 52.9° N 126.2° W Stratum 4 Canada, British Columbia 55.3° N 123° W Stratum 4 Canada, British Columbia 51.9° N 121.2° W Stratum 4 Canada, British Columbia 50.6° N 120.6° W Stratum 4 Canada, Manitoba 56.4° N 101.1° W Stratum 1 Canada, Manitoba 58.1° N 100.7° W Stratum 3 Canada, Manitoba 54.3° N 94.9° W Stratum 4 Canada, Manitoba 52.4° N 95.5° W Stratum 4 Canada, Manitoba 56.1° N 97.8° W Stratum 4 Canada, Newfoundland 54.3° N 61.8° W Stratum 4 Canada, Northwest Territories 62.3° N 114° W Stratum 1 Canada, Northwest Territories 61.3° N 112.8° W Stratum 2 Canada, Northwest Territories 64.6° N 126.8° W Stratum 2 Canada, Nunavut 62.6° N 100.4° W Stratum 1 Canada, Nunavut 60.8° N 99.8° W Stratum 1 Canada, Ontario 52.6° N 90.9° W Stratum 1 Canada, Ontario 51.9° N 86.1° W Stratum 1 Canada, Ontario 51.8° N 87.4° W Stratum 2 Canada, Ontario 47.3° N 83.1° W Stratum 3 Canada, Ontario 47.9° N 84.4° W Stratum 3 Canada, Ontario 49.4° N 79.5° W Stratum 4 Canada, Ontario 50.1° N 87.1° W Stratum 4 Canada, Ontario 48.9° N 82.3° W Stratum 4 Canada, Ontario 50.1° N 93.1° W Stratum 4 Canada, Quebec 57.1° N 65.5° W Stratum 1 Canada, Quebec 46.6° N 77.2° W Stratum 3 Canada, Quebec 49.8° N 68.2° W Stratum 3 Canada, Quebec 50.1° N 73.1° W Stratum 4 Canada, Quebec 50.3° N 76.2° W Stratum 4 Canada, Quebec 47.3° N 78.9° W Stratum 4 Canada, Quebec 50.6° N 76.5° W Stratum 4 Canada, Quebec 49.4° N 77.8° W Stratum 4 Canada, Quebec 51.6° N 77.9° W Stratum 4 Canada, Quebec 48.8° N 77° W Stratum 4 Canada, Saskatchewan 52.9° N 106.6° W Stratum 1 Canada, Saskatchewan 58.1° N 104.5° W Stratum 3 Canada, Saskatchewan 58.8° N 108.1° W Stratum 4 Canada, Yukon Territory 63.4° N 134.3° W Stratum 4 Canada, Yukon Territory 63.6° N 139.9° W Stratum 4 United States, Alaska 64.9° N 154.7° W Stratum 1 United States, Alaska 58.8° N 137.7° W Stratum 2 United States, Alaska 64.4° N 149.2° W Stratum 4 United States, Alaska 66.4° N 149.8° W Stratum 4 United States, Alaska 65.3° N 147.5° W Stratum 4 United States, Alaska 63.8° N 158.5° W Stratum 4 United States, Alaska 62.6° N 155.1° W Stratum 4 United States, Minnesota 48.8° N 94.7° W Stratum 1 United States, Montana 48.4° N 113.9° W Stratum 3 United States, Washington 47.4° N 120.3° W Stratum 2 United States, Washington 48.3° N 120.5° W Stratum 4 United States, Wisconsin 45.1° N 88.2° W Stratum 2