Raw data for urban trees in California communities

This study used data from field plots in urban areas to describe forest structure (e.g., tree numbers, density, basal area, species composition) for six land use categories in six California climate zones: Southern California Coast, Inland Empire, Inland Valley, Southwest Desert, Northern, and Interior West. Two types of field plot data were utilized. The first set of data include 702 randomly sampled 0.04 hectare (ha) plots obtained from i-Tree Eco plot data for Los Angeles (in 2007-2008), Santa Barbara (2012) and the Sacramento area (2007). The second set of data (687 plots, in 2011) consisted of 0.067 ha (four 0.017 ha subplots) plots based on the Forest Service Forest Inventory and Analysis (FIA) plot design. The number of plots collected varied by climate zone and a total of 3,796 trees were sampled. Data collection included percentage of tree canopy cover over the plot, tree species, stem diameter at breast height (1.37 meters above ground, dbh), tree height, crown width, distance and azimuth to buildings that fit the requirements as specified in the i-Tree Eco and Urban FIA manuals.This record was taken from the USDA Enterprise Data Inventory that feeds into the https://data.gov catalog. Data for this record includes the following resources: ISO-19139 metadata ArcGIS Hub Dataset ArcGIS GeoService For complete information, please visit https://data.gov.

本研究利用来自城市区域田间地块的数据，对加利福尼亚六个气候区域（南加州海岸、内陆帝国、内陆谷地、西南沙漠、北部和内陆西部）六种土地利用类型的森林结构（例如，树木数量、密度、树基面积、物种组成）进行了描述。研究采用了两种类型的田间地块数据。第一组数据包括来自洛杉矶（2007-2008年）、圣巴巴拉（2012年）和萨克拉门托地区（2007年）的i-Tree Eco地块数据的702个随机抽样的0.04公顷（ha）地块。第二组数据（687个地块，2011年）基于美国森林服务机构森林资源清查和分析（FIA）地块设计，包括0.067公顷（四个0.017公顷的子地块）。不同气候区域的采样地块数量各异，共收集了3,796棵树的样本。数据收集内容包括地块上树木冠层覆盖率、树木物种、胸径（地面以上1.37米处，dbh）、树木高度、树冠宽度以及符合i-Tree Eco和Urban FIA手册规定要求的建筑物的距离和方位角。该记录来源于向https://data.gov目录提供数据的美国农业部企业数据目录。本记录的数据资源包括以下内容：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS GeoService。欲获取完整信息，请访问https://data.gov。