SCShores: time-series of shorelines from Spanish Sandy beaches from citizen-science monitoring program.

This repository contains 5 years of sandy beaches shorelines deriverd from a citizen-science monitoring program in the Spanish coast. The methodology and the dataset are described in: González-Villanueva, R., Soriano-González, J., Alejo, I., Criado-Sudau, F., Plomaritis, T., Fernàndez-Mora, À., Benavente, J., Del Río, L., Nombela, M. Á., and Sánchez-García, E.: SCShores: a comprehensive shoreline dataset of Spanish sandy beaches from a citizen-science monitoring programme, Earth System Science Data. V. 15, 4613-4629 , https://doi.org/10.5194/essd-15-4613-2023, 2023. The shoreline dataset is provided in 1 GEOJSON file: SCShores.geojson. This dataset covers five sandy beaches located on the Atlantic and Mediterranean coasts of Spain where CoastSnap stations were available, and it includes a total of 1721 shorelines. The coordinate system for the geospatial layer is WGS84. SCShores.geojson: this layer contains the sandy shorelines . Each feature in this layer is a multipoint with the following attributtes: site: CoastSnap station name id, e.g. agrelo, samarador, cadiz, …. date: date and time of the shoreline, yyyyy-mm-dd hh:mm:ss timezone: Coordinated Universal Time, UTC timestampQuality: quality flag indicating the confidence in the date-time indicated by the image provider, e.g. 1, 2 imageSource: source of the original image from which the shoreline has been derived, e.g. Instagram, Twitter, Facebook, Email, CoastSnapApp elevation_m: same as Z coordinate, defined by the observed tide and the tidal offset, in meters, Tide+tide offset verticalDatum: mean sea level in Alicante, which is considered the zero topographic reference in the Spanish territory, NMMA geometry: type of geometry used in the file, MultiPoint coordinates: Geographic WGS84 coordinates for each point in the geometry, longitude, latitude, Z本仓库包含源自西班牙海岸公民科学监测项目的5年沙滩岸线数据集。本数据集及其研究方法已发表于以下文献： González-Villanueva, R.、Soriano-González, J.、Alejo, I.、Criado-Sudau, F.、Plomaritis, T.、Fernàndez-Mora, À.、Benavente, J.、Del Río, L.、Nombela, M. Á. 及 Sánchez-García, E.：《SCShores：源自公民科学监测项目的西班牙沙滩综合岸线数据集》，《地球系统科学数据（Earth System Science Data）》，第15卷，4613-4629页，https://doi.org/10.5194/essd-15-4613-2023，2023年。 本岸线数据集以1份GEOJSON文件SCShores.geojson提供。该数据集涵盖西班牙大西洋与地中海沿岸可部署CoastSnap站点（CoastSnap）的5处沙滩，总计包含1721条岸线。地理空间图层的坐标系为WGS84。 SCShores.geojson：该图层存储沙滩岸线数据，图层内的每个要素均为多点（MultiPoint）类型，包含以下属性： - site：CoastSnap站点名称ID，例如agrelo、samarador、cadiz等； - date：岸线对应的日期与时间，格式为yyyy-mm-dd hh:mm:ss； - timezone：协调世界时（UTC）； - timestampQuality：时间戳质量标记，用于表征图像提供者提供的日期时间信息的置信度，取值例如1、2； - imageSource：提取岸线所用原始图像的来源，例如Instagram、Twitter、Facebook、电子邮件、CoastSnapApp； - elevation_m：即Z坐标，由实测潮位与潮位偏移量计算得到，单位为米，计算公式为“潮位+潮位偏移量”； - verticalDatum：垂直基准面，采用西班牙境内通用的地形零点基准——阿利坎特平均海平面（NMMA）； - geometry：文件中使用的几何类型为MultiPoint（多点）； - coordinates：几何要素中每个点的WGS84地理坐标系坐标，依次为经度、纬度、Z值。