Baltimore Ecosystem Study LTER site, station Howard County, MD (FIPS 24027), study of population employed in service (percent of total) in units of percent on a yearly timescale

The EcoTrends project was established in 2004 by Dr. Debra Peters
(Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and
Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest)
to support the collection and analysis of long-term ecological datasets.
The project is a large synthesis effort focused on improving the accessibility
and use of long-term data. At present, there are ~50 state and federally funded
research sites that are participating and contributing to the EcoTrends project,
including all 26 Long-Term Ecological Research (LTER) sites and sites funded by
the USDA Agriculture Research Service (ARS), USDA Forest Service,
US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal
(http://www.ecotrends.info). This web portal enables the continuation of data
compilation and accessibility by users through an interactive web application.
Ongoing data compilation is updated through both manual and automatic
processing as part of the LTER Provenance Aware Synthesis Tracking
Architecture (PASTA). The web portal is a collaboration between the Jornada LTER
and the LTER Network Office. The following dataset from Baltimore Ecosystem Study LTER (BES)
contains population employed in service (percent of total) measurements in percent units
and were aggregated to a yearly timescale.

EcoTrends项目于2004年由德布拉·彼得斯博士（乔纳达盆地长期生态研究站，美国农业部农业研究局乔纳达实验牧场）与阿里尔·卢戈博士（卢奎洛长期生态研究站，美国农业部林务局卢奎洛实验森林）创立，旨在为长期生态数据集的收集与分析工作提供支撑。本项目为一项大型综合研究计划，核心目标是提升长期生态数据的可获取性与使用率。目前共有约50个由州级及联邦政府资助的研究站点参与EcoTrends项目并贡献数据，其中涵盖全部26个长期生态研究（Long-Term Ecological Research）站点，以及由美国农业部农业研究服务局（USDA-ARS）、美国农业部林务局（USDA-FS）、美国能源部、美国地质调查局（US Geological Survey，USGS）与众多高校资助的各类站点。EcoTrends项目的数据可通过探索性网络门户（http://www.ecotrends.info）获取。该门户依托交互式网页应用，为用户持续开展数据汇编与数据获取工作提供支持。作为LTER溯源感知综合跟踪架构（PASTA）的组成部分，正在进行的数据汇编工作将通过人工与自动两种处理方式完成更新。本网络门户为乔纳达LTER与LTER网络办公室的合作成果。以下来自巴尔的摩生态系统研究LTER（BES）的数据集，包含以百分比为单位的服务业就业人口占总就业人口比例的测量值，且已按年度时间尺度完成聚合。