Supplement 1. Time series of annual fire extent in the U.S. northern Rockies.

File List Northern_Rockies_fire_extent_ha.csv Description Northern_Rockies_fire_extent_ha.csv contains a time series of annual fire extent in hectares from 12 national forests and 1 national park in Idaho and Montana west of the Continental Divide. In addition to total fire extent, it includes fire extent by vegetation type (environmental site potential, ESP). The column headings are self explanatory (year,total_fire_extent_ha,cold_forest_extent_ha,mesic forest_extent_ha,dry forest_extent_ha,woodland_extent_ha,mesic shrub_extent_ha,dry_shrub_extent_ha,grassland_extent_ha,other_extent_ha,sum_of_extent_by_ESP). total_fire_extent_ha is not exactly equal to sum_of_extent_by_ESP because the values by ESP were computed within the fire-atlas recording area only whereas a small percentage of total fire extent occurred outside the fire-atlas recording area. Checksum values for the columns are: -- TABLE: Please see in attached file. --

文件列表：Northern_Rockies_fire_extent_ha.csv
数据集描述：Northern_Rockies_fire_extent_ha.csv 收录了大陆分水岭以西爱达荷州与蒙大拿州境内12处国家森林及1处国家公园的年度过火面积（公顷）时序数据集。除总过火面积外，该数据集还按植被类型——环境立地潜力（Environmental Site Potential，ESP）——分类统计了过火面积。各列标题含义明确，具体包括：year（年份）、total_fire_extent_ha（总过火面积/公顷）、cold_forest_extent_ha（寒带森林过火面积/公顷）、mesic forest_extent_ha（中生森林过火面积/公顷）、dry forest_extent_ha（旱生森林过火面积/公顷）、woodland_extent_ha（疏林过火面积/公顷）、mesic shrub_extent_ha（中生灌丛过火面积/公顷）、dry_shrub_extent_ha（旱生灌丛过火面积/公顷）、grassland_extent_ha（草原过火面积/公顷）、other_extent_ha（其他类型过火面积/公顷）、sum_of_extent_by_ESP（按ESP分类的过火面积总和/公顷）。需注意，total_fire_extent_ha 与 sum_of_extent_by_ESP 的数值并不完全相等，原因是按ESP分类的过火面积仅统计了火灾图集记录区域内的数值，而总过火面积中有极小一部分发生在火灾图集记录区域之外。各列的校验和值详见附件文件。