Flow Direction from Land Surface - Parker and Ipswich Watersheds - ASCII Raster File

This datalayer is a gridded flow direction (i.e. river network) of the watersheds draining to Plum Island Sound. The resolution is 120 m x 120 m. This layer gives the direction of each cell to the next downstream grid cell. The gridded river network is used to explore scientific questions regarding the role of different land uses in defining nutrient loading, and the role of river systems in controlling exports to the coastal zone. Provide the flow direction of materials from source areas on land to downstream aquatic systems for general mapping and display, nutrient loading and routing analysis, and aquatic ecosystem modeling.

本数据图层为汇入普拉姆岛湾（Plum Island Sound）的流域的格网流向数据（即河网），空间分辨率为120米×120米。该图层定义了每个格网单元至其下游相邻格网单元的流向。这套格网河网可用于探究不同土地利用方式在调控养分负荷中所发挥的作用，以及河网系统对向近岸海域输出物质的调控机制相关的科学问题。同时，该数据可为通用制图与展示、养分负荷与路径分析以及水生生态系统建模等场景，提供陆源区物质向下游水生系统输送的流向信息。