Vegetation - Doyle-Loyalton [ds3089]

Under contract to the California Department of Fish and Wildlife (CDFW), the North State Planning and Development Collective (NSPDC) created a fine-scale vegetation map of portions of the Sierra Nevada mountains around Lake Tahoe and the adjacent Modoc Plateau. CDFW’s Vegetation Classification and Mapping Program (VegCAMP) provided in-kind service to allocate and score the Accuracy Assessment. The mapping study area consists of approximately 1.6 million acres, covering portions of Sierra, Plumas, Placer, Nevada, Modoc, and Lassen counties. Work was performed on the project between 2019 and 2023. The purposes of the project include assisting land managers in decision-making, fire and fuel management, protecting endangered species and habitats, protecting cultural and natural resources, habitat connectivity, habitat restoration, conservation prioritization, and informed development. NSPDC staff conducted 434 Rapid Assessment and Releve surveys across the mapping area in the summer of 2019 to gather vegetation data to be used in the development of a vegetation classification for the project area. VegCAMP developed the floristic vegetation classification used for the project. The floristic classification follows protocols compliant with the Federal Geographic Data Committee (FGDC) and National Vegetation Classification Standards (NVCS). The vegetation map was produced applying heads-up digitizing techniques using a 2018 base of one-meter National Agricultural Imagery Program (NAIP) imagery (true-color and color infrared), in conjunction with ancillary data and imagery sources. Map polygons are assessed for Vegetation Type, Percent Cover, Exotics, Development Disturbance, and other attributes. The minimum mapping unit (MMU) is 1 acre; exceptions are made for wetlands and riparian types, which were mapped to a 1/4 acre. Breaks on overstory cover were done at 3 acres. Field reconnaissance and the Accuracy Assessment enhanced the overall map quality. There were a total of 107 mapping classes. The overall Fuzzy Accuracy Assessment rating for the final vegetation map,at the Alliance, Group, and Macrogroup levels, is 81.7% percent.受加利福尼亚州鱼类与野生动物部（California Department of Fish and Wildlife, CDFW）委托，北州规划与开发联合体（North State Planning and Development Collective, NSPDC）绘制了塔霍湖周边内华达山脉部分区域及邻近莫多克高原的精细尺度植被地图。加利福尼亚州鱼类与野生动物部下属的植被分类与制图项目（Vegetation Classification and Mapping Program, VegCAMP）提供实物服务，以开展精度评估的分配与评分工作。本次制图研究区域总面积约160万英亩，覆盖谢拉县、普卢默斯县、普莱瑟县、内华达县、莫多克县及拉森县的部分区域。本项目实施周期为2019年至2023年。本项目的目标包括助力土地管理者开展决策、火情与燃料管理、保护濒危物种及其栖息地、保护文化与自然资源、维持栖息地连通性、实施栖息地修复、开展保护优先级划分，以及为开发活动提供科学决策依据。2019年夏季，NSPDC工作人员在制图区域内开展了434次快速评估与样方调查（Rapid Assessment and Releve surveys），以收集植被数据，用于制定项目区域的植被分类体系。VegCAMP制定了本项目所采用的植物区系植被分类体系，该体系符合联邦地理数据委员会（Federal Geographic Data Committee, FGDC）与国家植被分类标准（National Vegetation Classification Standards, NVCS）的相关规程。本次植被地图以2018年分辨率为1米的美国农业部农业影像计划（National Agricultural Imagery Program, NAIP）影像（真彩色与彩红外影像）作为底图，结合辅助数据与其他影像源，采用屏幕数字化（heads-up digitizing）技术制作完成。制图多边形的植被类型、盖度百分比、外来物种占比、开发干扰程度及其他属性均经过评估。最小制图单元（minimum mapping unit, MMU）为1英亩，湿地与河岸类型除外，此类地物的制图单元为0.25英亩。林冠盖度的分级分界以3英亩为标准。野外踏勘与精度评估工作提升了地图的整体质量。本数据集共包含107个制图分类。最终植被地图在群丛联盟（Alliance）、群丛组（Group）及宏群丛组（Macrogroup）层级上的模糊精度评估总评分为81.7%。