Vegetation - Owens Valley and Jawbone [ds2874]

The U.S. Bureau of Land Management (BLM) contracted Aerial Information Systems, Inc. (AIS) to continue vegetation classification development and fine-scale vegetation mapping of 1,016,668 acres over four subareas within Inyo, Kern, and Imperial counties of the Desert Renewable Energy Conservation Plan (DRECP) region. The four subareas are designated as Salton Sea South (224,763 acres), Jawbone South (204,133 acres), Owens Valley (392,906 acres), and Picacho (194,866 acres). Work performed is based on the classification and mapping standards as outlined in the Survey of California Vegetation, Classification, and Mapping Standards developed by the California Department of Fish and Wildlife's (CDFW) Vegetation, Classification, and Mapping Program (VegCAMP) (VegCAMP, 2020). California Native Plant Society (CNPS), as a subcontractor to AIS, conducted any classification development work needed for this project and conducted the accuracy assessment surveys. The subareas included in this map are Jawbone North (151,986 acres), Jawbone South (204,133 acres), and Owens Valley (392,906 acres). BIOS ds735 contains the other areas. The previous mapping for the DRECP region was conducted in two phases from 2011 to 2016 for the California Energy Commission. The maps were primarily produced to support the DRECP by helping planners more accurately identify high quality habitat and rare communities as they consider renewable energy sources and conservation opportunities. In 2011-2012 AIS and VegCAMP created a fine-scale vegetation map covering approximately six million acres of portions of the Mojave and Sonoran Deserts in southern California (Menke et al., 2013). In addition, mapping of 95,981 acres within Rice and Vidal Valleys in the Colorado Desert portion of the Sonoran Desert was completed by AIS in 2013-2014 as an extension to the original project. Subsequently, between 2014 and 2016, AIS was tasked to create a fine-scale vegetation map of 2,195,415 acres of desert in Inyo, San Bernardino, Riverside, and Imperial counties in southern California. Areas mapped include the eastern and central portions of the Mojave Desert as well as the Lower Colorado Valley (also referred to as the Colorado Desert), and the Arizona Upland subdivisions of the Sonoran Desert (Menke et al., 2016). The vegetation classification follows Federal Geographic Data Committee (FGDC) and National Vegetation Classification Standards (NVCS). The classification is based on new and previous survey and classification work. The map was produced applying heads-up digitizing techniques using a base of 2016 or 2018 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 10 acres; exceptions are made for wetlands and certain wash types (which were mapped to a 1 or 5 acre MMU, depending on type) and areas characterized as Land Use polygons (which were mapped to a 2.5 acre MMU). In the progression to non-desert areas the MMU transitioned to 1 acre for upland types and 1/4 acre for special types. Field reconnaissance and accuracy assessment enhanced map quality. There were a total of 126 mapping classes. The overall accuracy assessment ratings for the final vegetation map were 86.23 percent for User's Accuracy, and 87.9 for Producer's Accuracy. Accuracy assessment ratings for the subareas included in this map are as follows: Owens Valley: User's Accuracy 83.9, Producer's Accuracy 85.4 Jawbone North: User's Accuracy 86.7, Producer's Accuracy 85.5 Jawbone South: User's Accuracy 82.8, Producer's Accuracy 84.3 For detailed information please refer to the following reports: Reyes, E., J. Evens, A. Glass, Sikes, K, Keeler-Wolf, T., D. Johnson, S. Winitsky, J. Menke and A. Hepburn. 2020 CALIFORNIA VEGETATION MAP IN SUPPORT OF THE DESERT RENEWABLE ENERGY CONSERVATION PLAN . U.S. Bureau of Land Management; 12/2020. Menke, J., E. Reyes, A. Hepburn, D. Johnson and J. Reyes. California Vegetation Map in Support of the Desert Renewable Energy Conservation Plan (2014-2016 Additions). Aerial Information Systems; 5/2016. Menke, J., E. Reyes, A. Glass, D. Johnson and J. Reyes. 2013 California Vegetation Map in Support of the Desert Renewable Energy Conservation Plan. California Dept. of Fish and Wildlife, California Energy Commission; 4/2013.美国土地管理局（U.S. Bureau of Land Management, BLM）与航空信息系统公司（Aerial Information Systems, Inc., AIS）签订合同，继续开展沙漠可再生能源保护计划（Desert Renewable Energy Conservation Plan, DRECP）区域内因约县、克恩县和帝国县下辖4个分区共1,016,668英亩土地的植被分类研发与精细尺度植被制图工作。该4个分区分别为索尔顿海南部（Salton Sea South，224,763英亩）、乔布博南部（Jawbone South，204,133英亩）、欧文斯谷（Owens Valley，392,906英亩）以及皮查科（Picacho，194,866英亩）。 本次作业遵循由加州鱼类与野生动物部（California Department of Fish and Wildlife, CDFW）植被分类与制图项目（Vegetation, Classification, and Mapping Program, VegCAMP）制定的《加州植被调查、分类与制图标准》（VegCAMP, 2020）中所列的分类与制图规范。 加州本土植物协会（California Native Plant Society, CNPS）作为AIS的分包商，承担了本项目所需的全部分类研发工作，并开展了精度评估调查。 本地图涵盖的分区为乔布博北部（Jawbone North，151,986英亩）、乔布博南部（204,133英亩）以及欧文斯谷（392,906英亩），其余区域收录于BIOS ds735数据集。 DRECP区域的前期制图工作分为两个阶段，于2011至2016年间为加州能源委员会完成。该地图主要用于支撑DRECP工作，帮助规划人员在考量可再生能源开发与保护机遇时，更精准地识别高质量栖息地与珍稀群落。 2011-2012年，AIS与VegCAMP共同绘制了覆盖南加州莫哈韦沙漠与索诺兰沙漠部分区域约600万英亩土地的精细尺度植被图（Menke等，2013）。2013-2014年，AIS还完成了索诺兰沙漠科罗拉多沙漠分区内赖斯谷与维达尔谷共95,981英亩土地的制图工作，作为原项目的延伸。随后在2014至2016年间，AIS承接任务，为南加州因约县、圣贝纳迪诺县、河滨县与帝国县共2,195,415英亩的沙漠区域制作精细尺度植被图。本次制图区域涵盖莫哈韦沙漠东部与中部区域，以及下科罗拉多河谷（又称科罗拉多沙漠）与索诺兰沙漠的亚利桑那高地分区（Menke等，2016）。 本次植被分类遵循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），基于新旧调查与分类工作成果开展。地图制作采用了基于2016或2018年1米分辨率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）的目视数字化技术，并结合辅助数据与其他影像数据源完成。 地图多边形需评估植被类型、覆盖百分比、外来物种、开发干扰及其他属性信息。最小制图单元（minimum mapping unit, MMU）为10英亩；湿地与特定冲沟类型（根据类型分别采用1英亩或5英亩的最小制图单元）以及土地利用多边形（采用2.5英亩的最小制图单元）除外。向非沙漠区域过渡时，高地类型的最小制图单元调整为1英亩，特殊类型则调整为0.25英亩。 野外踏勘与精度评估有效提升了地图质量。本次制图共包含126个分类类别。最终植被图的整体精度评估结果为：用户精度（User's Accuracy）86.23%，生产者精度（Producer's Accuracy）87.9%。本地图涵盖分区的精度评估结果如下： 欧文斯谷：用户精度83.9，生产者精度85.4 乔布博北部：用户精度86.7，生产者精度85.5 乔布博南部：用户精度82.8，生产者精度84.3 如需获取详细信息，请参阅以下报告： 1. Reyes, E., J. Evens, A. Glass, K. Sikes, T. Keeler-Wolf, D. Johnson, S. Winitsky, J. Menke 与 A. Hepburn. 2020. 《支持沙漠可再生能源保护计划的加州植被地图》. 美国土地管理局; 2020年12月. 2. Menke, J., E. Reyes, A. Hepburn, D. Johnson 与 J. Reyes. 《支持沙漠可再生能源保护计划的加州植被地图（2014-2016增补版）》. 航空信息系统公司; 2016年5月. 3. Menke, J., E. Reyes, A. Glass, D. Johnson 与 J. Reyes. 2013. 《支持沙漠可再生能源保护计划的加州植被地图》. 加州鱼类与野生动物部、加州能源委员会; 2013年4月.