Vegetation - Mill Creek - 2013 [ds1346]

In 2010, U.S. Fish and Wildlife Service contracted Stillwater Sciences and Aerial Information Systems to create a fine-scale vegetation map of the Cow Creek and Mill Creek riparian corridors. The mapping study area consists of approximately 22,142 acres of riparian corridors of Cow Creek and 20,921 acres of riparian corridor of Mill Creek. The minimum mapping unit (MMU) is 1 acre for uplands and 0.5 acre for special and wetland features. The vegetation map adheres to the 2009 National Vegetation Classification System (NVCS) and the Manual of California Vegetation. Features represent vegetation mapping for the Cow Creek Riparian Corridor, as specified for the Project Area designated in the contract between Stillwater Sciences and USFWS (USFWS Agreement No. 81330AJ365). Original mapping was performed by AIS, using 2010 NAIP imagery (1-m resolution). Stillwater performed an accuracy assessment in the field, and updated the vegetation mapping based on the observed conditions (Summer, 2013).2010年，美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service，USFWS）委托斯蒂尔沃特科学公司（Stillwater Sciences）与航空信息系统公司（Aerial Information Systems，AIS），为考溪（Cow Creek）与米尔溪（Mill Creek）的河岸廊道制作高精度植被地图。本次制图的研究范围涵盖约22142英亩的考溪河岸廊道，以及20921英亩的米尔溪河岸廊道。最小制图单元（minimum mapping unit，MMU）规定为：高地类要素的最小制图单元为1英亩，特殊地物与湿地类要素的最小制图单元为0.5英亩。该植被地图遵循2009版《国家植被分类系统》（National Vegetation Classification System，NVCS）与《加利福尼亚植被手册》（Manual of California Vegetation）。本数据集的植被制图成果对应考溪河岸廊道范围，严格遵循斯蒂尔沃特科学公司与美国鱼类及野生动物管理局（USFWS）所签订合同中指定的项目区域要求（合同编号：USFWS Agreement No. 81330AJ365）。初始制图工作由航空信息系统公司（AIS）完成，所用数据源为2010年美国农业部农业航拍影像计划（National Agriculture Imagery Program，NAIP）的1米分辨率影像。斯蒂尔沃特科学公司于2013年夏季开展了野外精度验证，并基于实地观测结果对植被地图进行了更新。