Hestia SW-IFL Onroad Fossil Fuel Carbon Dioxide (FFCO2) product: Road segment-level annual FFCO2 emissions across Arizona (2017-2022), version 1.1

The SW-IFL onroad fossil fuel carbon dioxide (FFCO2) emissions data product represents CO2 emissions from the combustion of fossil fuels by motor vehicles (e.g., passenger cars, trucks, buses, motorcycles) traveling on designated roadways. The emissions are represented geographically on each road segment within the state of Arizona spanning the 2017 to 2022 time period. This data product was developed as part of the Southwest Urban Corridor Integrated Field Laboratory (SW-IFL) project, which aims to provide new knowledge and tools that address urban environmental issues by integrating high-resolution observations, modeling, and civic engagement. The emissions data are provided in CSV (input data, ONR_FFCO2_AZ_county.csv) and GeoPackage form (output polyline objects - about 786,000 road segments, XXXX_AZ_v1.1.gpkg) designated by road class (interstates, arterials, collectors, local). The metadata file (Metadata_SW-IFL_Onroad_annualFFCO2_v1.1.docx) provides details about attributes and data formats. The GeoPackage emissions data are provided separately for local roads and nonlocal roads (interstates, arterials, collectors). The method file (Methods_SW-IFL_Onroad_annualFFCO2_v1.1.docx) describes the data processing flow and data sources. Update on 2024-04-17: Updates were made to both the input emission data file (.csv) and output segment-level emission file (.gpkg). There was an update in county-level emission input data (ONR_FFCO2_AZ_county.csv) and the entire road segments were reprocessed to reflect this update. Update on 2024-04-29: Update was made to one output segment-level emission file (Nonlocal_AZ_v1.0.gpkg). There was an error in the AADT values and the data were reprocessed to reflect this update. Update on 2024-10-22: Temporal coverage was extended to include 2022. VMT values were recalculated using new AADT data and the entire road segments were reprocessed to reflect these updates.

SW-IFL路面化石燃料二氧化碳（FFCO2）排放数据集产品，指亚利桑那州境内指定道路上行驶的机动车（如乘用车、货车、巴士、摩托车）因化石燃料燃烧产生的二氧化碳排放。该排放数据以地理空间形式呈现于2017至2022年时间段内亚利桑那州的各道路路段之上。本数据集产品系西南城市走廊综合现场实验室（SW-IFL）项目的成果之一，该项目旨在通过集成高分辨率观测、建模与公众参与，为解决城市环境问题提供全新的认知与工具。该排放数据提供两种格式：CSV格式（输入数据文件：ONR_FFCO2_AZ_county.csv）与GeoPackage格式（输出折线对象——约78.6万个道路路段，命名格式为XXXX_AZ_v1.1.gpkg），数据按道路等级（高速公路、主干道、集散道、支路）进行分类。元数据文件（Metadata_SW-IFL_Onroad_annualFFCO2_v1.1.docx）详细说明了数据属性与数据格式。GeoPackage格式的排放数据分为本地道路与非本地道路（高速公路、主干道、集散道）两类单独提供。方法文档（Methods_SW-IFL_Onroad_annualFFCO2_v1.1.docx）阐述了数据处理流程与数据源。2024年4月17日更新：本次更新涵盖输入排放数据文件（.csv）与输出路段级排放文件（.gpkg）。县级排放输入数据（ONR_FFCO2_AZ_county.csv）已完成更新，并重新处理了全部道路路段以体现此次更新内容。2024年4月29日更新：本次更新针对一个输出路段级排放文件（Nonlocal_AZ_v1.0.gpkg）。原数据中年平均日交通量（AADT）数值存在错误，已重新处理数据以修正该问题。2024年10月22日更新：本次更新将数据的时间覆盖范围扩展至2022年。采用新的AADT数据重新计算了车辆行驶里程（VMT）数值，并重新处理了全部道路路段以体现此次更新内容。