Vegetation - Lava Beds National Monument - 2019 [ds2859]

The geographic information system (GIS) format spatial data set of vegetation for the Lava Beds National Monument (LABE) vegetation mapping and inventory project was created for the National Park Service (NPS) Vegetation Mapping Inventory Program (VMIP). The project area covers over 18,936 ha (46, 792 acres). The map classification scheme used to create the vegetation data set is designed to represent local vegetation types at the finest level possible using the National Vegetation Classification Standard (NVCS) Version 2. The associations present in each map unit are also coded into the database. Vegetation plot sampling was conducted to describe the associations and to develop the map classification scheme. A total of 169 vegetation plots were sampled at LABE. A detailed vegetation analysis of these data was undertaken along with historic information to develop the map classification scheme, in accordance with the National Vegetation Classification Standard (NVCS) Version 2. The vegetation data set was developed by interpreting 2009 NAIP aerial imagery and extensive field surveys. The project report for the LABE vegetation mapping project provides details pertaining to the methods of the vegetation sampling, classification, and mapping. The vegetation data are distributed as an ESRI format file geodatabase, stored in Universal Transverse Mercator zone 10 mapping coordinates, North American Datum 1983. The vegetation map consists of 582 polygons. 65 of these polygons were 100% dominated by one vegetation type, the rest were interpreted to be a mix of two vegetation types. The percent cover attribute for the primary and secondary (if present) vegetation in each polygon was estimated from photographic and field evidence. In addition, the occurrence of up to two associations and their percent cover were identified as composing the primary and secondary vegetation. The minimum mapping unit of each polygon is 0.5 hectares. Identified secondary map units within each polygon were intermixed at a scale below the minimum map unit. Vegetation types were crosswalked to MCV, CalVeg, and CWHR types by CDFW's Vegetation Classification and Mapping Program (VegCAMP). For the purpose of crosswalking, only the primary map unit was used. The mapping report is available from the document library here: https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=235741 The report is also bundled with the dataset, which can be downloaded from BIOS here: https://filelib.wildlife.ca.gov/Public/BDB/GIS/BIOS/Public_Datasets/2800_2899/ds2859.zip本数据集为熔岩床国家纪念碑（Lava Beds National Monument, LABE）植被制图与清查项目所构建的植被地理信息系统（Geographic Information System, GIS）格式空间数据集，其服务于美国国家公园管理局（National Park Service, NPS）植被测绘清单计划（Vegetation Mapping Inventory Program, VMIP）。该项目覆盖面积超过18936公顷（合46792英亩）。本植被数据集所采用的地图分类方案，依据《国家植被分类标准（National Vegetation Classification Standard, NVCS）》第二版，旨在以最精细的粒度表征当地植被类型。各制图单元所包含的群丛亦已编码存入数据库。为表征上述群丛并构建本分类方案，项目开展了植被样地调查工作，共在熔岩床国家纪念碑内布设并调查了169处植被样地。项目结合历史资料与上述样地数据开展了详细的植被分析工作，最终依据《国家植被分类标准》第二版完成了本地图分类方案的构建。本植被数据集通过解译2009年美国农业部农业航拍计划（National Agriculture Imagery Program, NAIP）的航空影像，并结合大量野外调查工作构建而成。熔岩床国家纪念碑植被制图项目的结题报告，详细记载了本次植被样地调查、分类及制图工作的具体方法。本植被数据集以ESRI格式文件地理数据库形式分发，采用通用横轴墨卡托（Universal Transverse Mercator）10号带投影坐标系，基准面为1983年北美大地基准面（North American Datum 1983）。本植被制图共包含582个多边形图斑，其中65个图斑完全由单一植被类型占据，剩余图斑经解译后均包含两种混合的植被类型。各多边形图斑内的优势植被与次优势植被（若存在）的盖度百分比，通过影像资料与野外调查证据进行估算得到。此外，项目还明确了构成图斑优势与次优势植被的最多两种群丛及其盖度百分比。本数据集的最小制图单元为0.5公顷，各图斑内识别出的次优制图单元均以小于最小制图单元的尺度相互混杂分布。加州鱼类与野生动物部（California Department of Fish and Wildlife, CDFW）植被分类与制图计划（Vegetation Classification and Mapping Program, VegCAMP）已将本数据集的植被类型与MCV、CalVeg及CWHR类型完成了匹配转换，本次转换仅采用了各图斑的优势制图单元数据。本项目的制图报告可从以下文档库获取：https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=235741。该报告亦随数据集一同打包，可从BIOS下载获取：https://filelib.wildlife.ca.gov/Public/BDB/GIS/BIOS/Public_Datasets/2800_2899/ds2859.zip