Vegetation - Garcia River Forest [ds722]

Aerial Information Systems, Inc. (AIS) was contracted by the Nature Conservancy to create a vegetation map covering approximately 23,800 acres (~37 square miles) of the Garcia River Watershed east of Point Arena in Mendocino County. The vegetation map adheres to the 2008 National Vegetation Classification Standard (NVCS) and the Manual of California Vegetation (MCV). One-meter National Agricultural Inventory Program (NAIP) imagery flown in July of 2005 was used as a base for the delineated polygons and photo interpretation signature. Two trips were taken in July and August of 2007 for reconnaissance. The vegetation units were then interpreted across the entire study area using heads-up digitizing techniques through custom tools developed in the Arc GIS 9.2 Software that were enhanced by AIS.As a general rule, common and widespread vegetation units were delineated down to a minimum mapping unit (MMU) of approximately ½ hectare. Small wetlands and forest openings were delineated in several incidences below the MMU. The report can be found here: https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=41130航空信息系统公司（Aerial Information Systems, Inc.，缩写AIS）受大自然保护协会委托，为门多西诺县阿雷纳角东侧的加西亚河流域（覆盖面积约23800英亩，约37平方英里）制作植被地图。该植被地图遵循2008年国家植被分类标准（National Vegetation Classification Standard，缩写NVCS）与《加利福尼亚植被手册》（Manual of California Vegetation，缩写MCV）。研究以2005年7月航空拍摄获取的1米分辨率国家农业清查计划（National Agricultural Inventory Program，缩写NAIP）影像作为勾绘多边形与建立影像解译标志的基础数据源。研究团队分别于2007年7月和8月开展两次野外踏勘。随后，AIS基于ArcGIS 9.2软件开发定制化工具并完成功能增强，研究团队借助该工具采用抬头式数字化技术，对整个研究区的植被单元开展解译工作。按照通用规范，常见广布植被单元的最小制图单元（minimum mapping unit，缩写MMU）设定为约0.5公顷。针对小型湿地与林中空地，研究中多次将其勾绘范围放宽至小于最小制图单元的尺度。本数据集相关报告可通过以下链接获取：https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=41130