ABoVE: Distribution Maps of Wildland Fire Fuel Components across Alaskan Tundra, 2015

This dataset provides maps of the distribution of three major wildland fire fuel types at 30 m spatial resolution covering the Alaskan arctic tundra, circa 2015. The three fuel components include woody (evergreen and deciduous shrubs), herbaceous (sedges and grasses), and nonvascular species (mosses and lichens). Multi-seasonal and multispectral mosaics were first developed at 30 m resolution using Landsat 8 surface reflectance data collected from 2013 to 2017. The spectral information from Landsat mosaics was combined with field observations from representative tundra vegetation plots collected during multiple field trips to model the fractional cover of fuel type components. An improved vegetation mask for shrub and graminoid-dominated tundra was developed using random forest classification and is also included. The final fractional cover maps were developed using the trained model with the multi-seasonal and multi-spectral Landsat mosaics across the entire Alaskan tundra.

本数据集提供了覆盖阿拉斯加北极苔原地区，空间分辨率为30米的三大主要野地火灾燃料类型分布图，时间约为2015年。燃料成分包括木质（常绿和落叶灌木）、草本（莎草和草本植物）以及非维管植物（苔藓和地衣）。首先利用2013年至2017年间收集的Landsat 8地表反射率数据，在30米分辨率下开发出多季节和多光谱镶嵌图像。将Landsat镶嵌图像的光谱信息与多次实地考察期间收集的代表性地表植被样地的实地观测数据相结合，以模拟燃料类型成分的分数覆盖率。利用随机森林分类技术，开发出适用于灌木和禾草类苔原的改进植被掩膜，并予以包含。最终，通过训练模型，使用跨整个阿拉斯加苔原的多季节和多光谱Landsat镶嵌图像，开发了燃料类型成分的最终分数覆盖率图。