Vegetation - North Carrizo Plain Mitigation Lands [ds1095]

The California Department of Fish and Wildlife (CDFW) Vegetation Classification and Mapping Program (VegCAMP) has created a fine-scale vegetation map of the Department’s mitigation lands in the northern portion of the Carrizo Plain, San Luis Obispo County, California. The mapping follows Survey of California Vegetation, Federal Geographic Data Committee (FGDC), and National Vegetation Classification (NVC) standards (FGDC 2008, Jennings et al. 2009). The map legend is based on the classification in Stout et al. (2013), with slight modifications as discussed in Appendix C of the project report, which is available here: https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=92969. Reconnaissance-level sampling of vegetation stands in the project area was conducted in the spring of 2013. Polygons were drawn using heads-up digitizing using the July 2011 1-foot imagery acquired for San Luis Obispo County and downloaded from US Geological Survey (USGS) EarthExplorer as the map base. Supplemental imagery included National Agricultural Imagery Program (NAIP) true color and color infrared (CIR) 1-meter resolution data from 2010–2012, Bing imagery, and current and historical imagery from Google Earth. The minimum mapping unit (MMU) is ½ acre in order to capture small, remnant native stands of trees, shrubs, and bunch grasses. Mapping is to the NVC hierarchy Association, Alliance, or Group level based on the ability of the photointerpreters to distinguish types based on all imagery available and on the field data. Field verification data was collected in the spring of 2014 and corrections were made to the map based on that data to increase the final accuracy.加利福尼亚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）已完成加州圣路易斯奥比斯波县卡里佐平原北部区域内该部门生态补偿用地的高精度植被制图。本次制图遵循《加州植被调查》、联邦地理数据委员会（Federal Geographic Data Committee, FGDC）以及国家植被分类系统（National Vegetation Classification, NVC）的相关标准（FGDC 2008；Jennings等，2009）。地图图例基于Stout等人2013年的植被分类体系，并根据项目报告附录C进行了小幅调整，项目报告可通过以下链接获取：https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=92969。2013年春季，研究团队对项目区域内的植被群落地块开展了踏勘级采样。本次制图的面状要素通过屏幕目视数字化（heads-up digitizing）完成，底图采用2011年7月为圣路易斯奥比斯波县获取的1英尺分辨率影像，该影像从美国地质调查局（US Geological Survey, USGS）地球探索者（EarthExplorer）平台下载获取。补充影像数据包括2010至2012年的美国农业部农业影像计划（National Agricultural Imagery Program, NAIP）真彩色与彩色红外（color infrared, CIR）1米分辨率影像、必应影像，以及谷歌地球的当前与历史影像。为捕捉小型残存本土乔木、灌木与丛生草本群落，本次制图的最小制图单元（minimum mapping unit, MMU）设定为0.5英亩。制图精度依据影像解译人员结合所有可用影像与实地数据区分植被类型的能力，匹配至国家植被分类系统的群丛（Association）、联盟（Alliance）或群组（Group）层级。研究团队于2014年春季采集了实地验证数据，并基于该数据对地图进行修正以提升最终制图精度。