Vegetation - California State Parks of the Central Coast [ds3193]

The Geographical Information Center (GIC) was contracted by the California Department of Parks and Recreation (CDPR) to collect vegetation surveys to contribute to regional and statewide classification and to create a fine-scale vegetation map following the Survey of California Vegetation (SCV) standards. This project involved the collection of 403 Rapid Assessment and Relevé vegetation surveys. The completed map covers a surface area of 88,003.92 acres. The vegetation map adheres to the guidelines outlined by the National Vegetation Classification System (USNVC 2019) and the Manual of California Vegetation (Sawyer, Keeler-Wolf, and Evens 2009). This methodology is in alignment with the California Department of Fish and Wildlife’s (CDFW) VegCAMP program in developing a classification system and mapping methodology for the entire state of California. This project was funded by the California Department of Parks and Recreation under grant agreement C20K0027. The Department of Fish and Wildlife’s Vegetation Classification and Mapping Program (VegCAMP), as well as the California Native Plant Society (CNPS) teams assisted in surveying and classification. The California Department of Parks and Recreation also assisted in surveying as well as permitted the Geographical Information Center to access their landholdings. These parks are further split into Department of Recreation (DPR) districts. This project covers 6 districts, including the Monterey, San Luis Obispo, Diablo Range, Central Valley, Santa Cruz, and Oceano Dunes districts. The scope of this project includes a comprehensive field sampling effort to characterize the vegetation communities within the study area, the creation of a digital vegetation map using ESRI software following the SCV standards, and a final summary report. There were 124 sample allocations that were created by CDPR for the field crews to sample. Many of these were not visited due to time constraints and/or accessibility issues. The allocation points are not only used to select specific plant communities, but also to spread the sampling effort across the mapping area. Sampling does not always take place at the exact allocation point due to these reasons. In 2021, 39 of the 264 surveys done by the GIC were adjacent to sample allocations, the other 225 were opportunistic samples. In 2022, 40 of the 86 surveys done by the GIC were near sample allocations, and the other 46 were opportunistic surveys. Sampling data from other organizations were also utilized to produce the vegetation maps. CDFW joined the sampling efforts in Mount Diablo SP in 2021 and contributed 33 surveys, of which 29 were opportunistic surveys. Additionally, photo-interpreters referenced CNPS and Tukman Geospatial sampling data from 2020 (23 surveys, 20 of which were opportunistic surveys) and 2021(146 surveys, all of which were opportunistic surveys). Both 2020 NAIP natural color and infrared imagery from the entire state were utilized for photo interpretation. No accuracy assessments have been completed. The minimum mapping unit (MMU) varies for this project. The MMU for woody and herbaceous upland stands is 1 acre, 0.25 acres for wetland and riparian, 1 acre for agriculture and urban and 0.25 acre for water. There is no MMU for polygons on the border of the mapping boundary as the vegetation stands often continue out of the park boundaries. Minimum width of linear polygons was 10 meters but photo-interpreters used discernment to preserve riparian stands. No accuracy assessment was performed. For more details the mapping standards, see Survey of California Vegetation Classification and Mapping Standards at: https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=102342&inline地理信息中心（Geographical Information Center, GIC）受加利福尼亚州公园与娱乐部（California Department of Parks and Recreation, CDPR）委托开展植被调查工作，旨在助力区域及全州植被分类，并依据《加利福尼亚植被调查》（Survey of California Vegetation, SCV）标准制作高精度植被地图。本项目共计完成403份快速评估（Rapid Assessment）与植被样方（Relevé）调查。最终完成的植被地图覆盖面积达88003.92英亩。该植被地图遵循《国家植被分类系统（2019版，USNVC 2019）》以及《加利福尼亚植被手册》（Sawyer、Keeler-Wolf与Evens，2009）中的相关规范。本项目的方法体系与加利福尼亚州鱼类与野生动物部（California Department of Fish and Wildlife, CDFW）的VegCAMP（植被分类与制图项目）保持一致，后者旨在为整个加利福尼亚州构建植被分类体系与制图方法。本项目由加利福尼亚州公园与娱乐部通过编号为C20K0027的资助协议提供资金支持。加利福尼亚州鱼类与野生动物部的植被分类与制图项目（VegCAMP）以及加利福尼亚本土植物学会（California Native Plant Society, CNPS）团队协助完成了调查与分类工作。加利福尼亚州公园与娱乐部同样协助开展调查，并为地理信息中心使用其辖区土地提供许可。上述公园进一步被划分为娱乐部（Department of Recreation, DPR）辖区。本项目覆盖6个辖区，分别为蒙特雷（Monterey）、圣路易斯奥比斯波（San Luis Obispo）、迪亚布洛岭（Diablo Range）、中央谷（Central Valley）、圣克鲁兹（Santa Cruz）以及奥塞诺沙丘（Oceano Dunes）辖区。本项目的工作范围包括：开展全面的野外采样工作以表征研究区域内的植被群落；依据SCV标准，使用Esri软件制作数字化植被地图；以及最终的总结报告。CDPR曾为野外作业团队规划124个采样点位，但受时间限制及/或通行条件限制，其中多数点位未被实际采样。采样点位不仅用于选定特定植物群落，还用于将采样工作均匀分布于制图区域内。由于上述限制因素，实际采样点位未必与规划点位完全重合。2021年，GIC完成的264份调查中，有39份紧邻规划采样点位，剩余225份为机会性采样。2022年，GIC完成的86份调查中，有40份临近规划采样点位，剩余46份为机会性采样。本项目同时利用了其他机构的采样数据以制作植被地图。2021年，CDFW参与了迪亚布洛山州立公园（Mount Diablo SP）的采样工作，共计提供33份调查数据，其中29份为机会性采样。此外，图像解译人员参考了CNPS与图克曼地理空间（Tukman Geospatial）2020年的采样数据（共23份，其中20份为机会性采样）及2021年的采样数据（共146份，全部为机会性采样）。本项目同时使用了全州范围的2020年全国农业影像计划（National Agriculture Imagery Program, NAIP）自然色与红外遥感影像进行图像解译。本项目尚未完成精度评估。本项目的最小制图单元（Minimum Mapping Unit, MMU）因植被类型而异：木本与草本旱地群落的最小制图单元为1英亩，湿地与河岸带群落为0.25英亩，农业与城市区域为1英亩，水体区域为0.25英亩。对于制图边界附近的多边形，未设置最小制图单元，因为植被群落往往延伸至公园边界之外。线性多边形的最小宽度为10米，但图像解译人员会通过审慎判断以保留河岸带群落。本项目未开展精度评估。如需了解更多制图标准，请参阅《加利福尼亚植被分类与制图标准调查》：https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=102342&inline