Vegetation - Modoc Plateau - Shinn, Likely, and Snowstorm Mountains - 2020 [ds2877]

Under contract to the California Department of Fish and Wildlife (CDFW), The Geographical Information Center (GIC) was tasked with creating a fine-scale vegetation and land use map of portions of the Modoc Plateau in northeastern California. The mapping effort was done in a two phases. The first phase started in 2016 and covered the ecoregion subsections named Cottonwood-Skedaddle Mountains, Likely Mountain, and the eastern portion of Eagle Lake-Observation Peak (Miles and Goudey 1997) which covered nearly 1.1 million acres. The second phase began in 2018 and covered the ecoregion subsections named Devil’s Garden and Adin Mountains, which covered an additional 866,228 acres. This map was produced during phase one of the project and covers approximately 1,091,702 acres in eastern Lassen and southern Modoc counties. The vegetation map followed guidelines set forth by the National Vegetation Classification System (NVCS) and A Manual of California Vegetation (MCV). It is an Alliance level map overall, with photo-interpreters attempting to map to the more specific Association level when they were confident to go to that level of detail. The GIC used 2016 NAIP imagery for mapping. Accuracy assessments were performed in 2018 and 2020. The minimum mapping unit (MMU) varies by vegetation type. For standard vegetation polygons the MMU is 1 acre. For wetland and riparian areas, the MMU is 0.25 acres. Polygons on the border of the mapping boundary did not have a MMU. For Agriculture and Urban areas, the MMU is 1 acre For Water, the MMU is 1 acre (with the exception of small earthen dams which went down to .25 acres). More information can be found in the project report, which is bundled with the vegetation map published for BIOS here: https://filelib.wildlife.ca.gov/Public/BDB/GIS/BIOS/Public_Datasets/2800_2899/ds2877.zip受加利福尼亚州鱼类与野生动物部（California Department of Fish and Wildlife, CDFW）委托，地理信息中心（Geographical Information Center, GIC）承担了为加利福尼亚州东北部莫多克高原（Modoc Plateau）部分区域制作高精度植被与土地利用地图的任务。本次制图工作分为两个阶段：第一阶段于2016年启动，覆盖的生态区域分区包括科顿伍德-斯凯达德尔山脉（Cottonwood-Skedaddle Mountains）、利克利山（Likely Mountain）以及鹰湖-观测峰（Eagle Lake-Observation Peak）的东部区域（Miles与Goudey，1997），总面积近110万英亩；第二阶段于2018年启动，覆盖的生态区域分区为魔鬼花园（Devil’s Garden）与阿丁山脉（Adin Mountains），新增覆盖面积866,228英亩。本植被地图为该项目第一阶段的产出成果，覆盖拉森县东部与莫多克县南部约1,091,702英亩的区域。该植被地图严格遵循《国家植被分类系统》（National Vegetation Classification System, NVCS）与《加利福尼亚植被手册》（A Manual of California Vegetation, MCV）制定的规范，整体制图等级为群丛联盟级（Alliance level）；当影像解译人员具备足够把握时，会尝试绘制精度更高的群丛级（Association level）地图。地理信息中心采用2016年美国国家农业航空影像计划（National Agriculture Imagery Program, NAIP）影像开展制图工作。精度评估工作分别于2018年与2020年完成。最小制图单元（Minimum Mapping Unit, MMU）的标准随植被类型有所差异：标准植被多边形的最小制图单元为1英亩；湿地与河岸带的最小制图单元为0.25英亩；制图边界沿线的多边形无最小制图单元限制；农业与城市区域的最小制图单元为1英亩；水域的最小制图单元为1英亩（小型土坝除外，其最小制图单元为0.25英亩）。更多详细信息可查阅配套项目报告，该报告与本数据集一同发布于BIOS平台，下载链接为：https://filelib.wildlife.ca.gov/Public/BDB/GIS/BIOS/Public_Datasets/2800_2899/ds2877.zip