A suite of global, cross-scale topographic variables for environmental and biodiversity modeling

Topographic variation underpins a myriad of patterns and processes in hydrology, climatology, geography and ecology and is key to understanding the variation of life on the planet. We provide a fully standardized and global multivariate product of different terrain features has the potential to support many large-scale research applications. The product is based on the digital elevation model products of global 250 m GMTED2010 and near-global 90 m SRTM4.1dev. We provide the following topographic variables: elevation, slope, aspect, eastness, northness, roughness, terrain roughness index, topographic position index, vector ruggedness measure, profile/tangential curvature, first/second order partial derivative, and 10 geomorphological landform classes. Each variable is provided at different aggregations from 1, 5, 10, 50 to 100 km spatial grains.

地形变异构成了水文、气候学、地理学和生态学中诸多模式和过程的基石，对于理解地球上生命的多样性至关重要。本数据集提供了一套全面标准化且全球性的多变量地形特征产品，该产品具有支持众多大规模研究应用的潜力。该产品基于全球250米GMTED2010数字高程模型产品和近全球90米SRTM4.1dev数字高程模型产品。我们提供了以下地形变量：高程、坡度、方位、东向度、北向度、粗糙度、地形粗糙度指数、地形位置指数、矢量崎岖度测量、剖面/切向曲率、一阶/二阶偏导数，以及10种地貌地形分类。每个变量均以1至100公里不等的空间分辨率（1、5、10、50、100公里）提供。