Arizona Topographic Relative Moisture Index (TRMI)

The Topographic Relative Moisture Index (TRMI) is a terrain-based index that estimates how wet or dry a location is likely to be based on its topographic attributes. TRMI incorporates several topographic parameters that influence moisture dynamics, including slope gradient, aspect, relative elevation (or topographic position), and landscape convexity or concavity [@parker1982]. Unlike purely hydrologic models (which might require soil or rainfall data), TRMI infers relative soil moisture patterns from topography. It’s based on the idea that topography controls moisture accumulation. This raster data layer was created to assist in mapping suitability for groundwater recharge potential throughout the State of Arizona.

地形相对湿度指数（Topographic Relative Moisture Index, TRMI）是一类基于地形的指数，可通过目标位置的地形属性估算其大概率的干湿状态。TRMI整合了若干影响水分动态的地形参数，包括坡度、坡向、相对高程（或称地形位置）以及景观凸度与凹度[@parker1982]。不同于需依赖土壤或降雨数据的纯水文模型，TRMI可从地形特征中推导相对土壤湿度的分布格局。该指数的核心理论为地形主导了水分的聚集过程。本栅格数据图层的制作目的，是辅助绘制亚利桑那州全域地下水补给潜力的适宜性分布图。