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

数据集说明
Northern_Rockies_fire_extent_ha.csv 包含了大陆分水岭以西爱达荷州与蒙大拿州境内12座国家森林及1座国家公园的年度过火面积（单位：公顷）时间序列数据。除总过火面积外，该数据集还包含按植被类型（立地环境潜力，environmental site potential，缩写ESP）划分的过火面积。列标题含义清晰明了，分别为：year（年份）、total_fire_extent_ha（总过火面积，单位：公顷）、cold_forest_extent_ha（寒带森林过火面积，单位：公顷）、mesic forest_extent_ha（中生森林过火面积，单位：公顷）、dry forest_extent_ha（旱生森林过火面积，单位：公顷）、woodland_extent_ha（疏林过火面积，单位：公顷）、mesic shrub_extent_ha（中生灌丛过火面积，单位：公顷）、dry_shrub_extent_ha（旱生灌丛过火面积，单位：公顷）、grassland_extent_ha（草原过火面积，单位：公顷）、other_extent_ha（其他类型过火面积，单位：公顷）、sum_of_extent_by_ESP（按ESP划分的过火面积总和，单位：公顷）。total_fire_extent_ha 与 sum_of_extent_by_ESP 并不完全相等，原因在于按ESP划分的过火面积仅统计了火灾图集（fire-atlas）记录范围内的区域，而总过火面积中有一小部分发生在该记录范围之外。

各列校验和如下：

-- 表格：详见附件文件。 --