Olive orchard stress assessment with supplementary Sentinel-2 data
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This file contains ground truthing data from olive orchards in Halkidiki, N.Greece and Sentinel-2 data for the noted samples. The samples collected for ground truthing are polygons inside the borders of olive orchards in Halkidiki. Polygons or Sampling units contain information associated with biotic and abiotic stress-related assessments carried out by visual inspection and laboratory analysis of samples with ongoing symptoms. Assessments were recorded as percentages of symptoms observed in the total vegetation surface present in each sampling unit. Symptom percentages were attributed to three possible classes: Verticillium dahliae, Spilocaea oleaginea, Unidentified Stress Factors. These percentage values were used to characterize healthy trees and the incidence of V. dahliae, S. oleaginea and unidentified stress factors (USF) in the sample. USF was used for all other non-classified surveyed symptoms attributed to diseases, pests, or abiotic-related damage. Percentages were summed to compute the total stress present in each sampling unit. “Total stress” refers to the stress incidence value used together with different thresholds to create binary labels for each sample of “stressed” or “not stressed”. The polygon geographical information for each sample were recorded and stored in shapefile format using SW maps, a mobile mapping and GIS app. Sentinel-2 data was paired with each sample using the Feature Info Service (FIS) available from sentinel hub, now upgraded into the Statistical API tool ( & ). This API enables acquisition of statistics calculated based on satellite imagery without having to download images. In the Statistical API request the area of interest, time period, evalscript and statistical measures of interest can be calculated. The requested statistics are returned in the API response. Statistical API deployments: https://creodias.sentinel-hub.com/api/v1/statistics https://services.sentinel-hub.com/api/v1/statistics https://services-uswest2.sentinel-hub.com/api/v1/statistics
本数据集包含希腊北部哈尔基季基州橄榄园的地面实况（ground truthing）数据，以及对应样本的哨兵二号（Sentinel-2）卫星数据。 本次用于地面实况验证的样本为哈尔基季基州橄榄园边界内的多边形地块。多边形地块（即采样单元）存储了相关信息，这些信息来自对出现持续胁迫症状的样本开展目视检查与实验室分析所得到的生物胁迫与非生物胁迫相关评估结果。评估结果以每个采样单元内植被总面积中观测到的症状占比进行记录。 症状占比被划分为三类：大丽轮枝菌（Verticillium dahliae）、橄榄疮痂病菌（Spilocaea oleaginea）以及未知胁迫因子（Unidentified Stress Factors）。上述占比数值用于表征样本中的健康植株占比，以及大丽轮枝菌（V. dahliae）、橄榄疮痂病菌（S. oleaginea）与未知胁迫因子（USF）的发生情况。未知胁迫因子（USF）用于归类所有其他未被分类的调查症状，这些症状可归因于病害、虫害或非生物性损伤。将各类症状占比求和，即可得到每个采样单元内的总胁迫值。 「总胁迫值」指的是结合不同阈值，为每个样本生成「受胁迫」或「未受胁迫」二分类标签时所使用的胁迫发生值。每个样本对应的多边形地块地理信息，通过移动端测绘与GIS应用SW Maps进行记录，并以形状文件（shapefile）格式存储。 哨兵二号卫星数据通过Sentinel Hub提供的要素信息服务（Feature Info Service, FIS）与每个样本进行匹配，该服务现已升级为统计API（Statistical API）工具。该API无需下载卫星影像，即可获取基于影像计算得到的统计数据。在统计API的请求中，可计算感兴趣区域、时间周期、评估脚本（evalscript）以及目标统计指标。API响应中将返回所请求的统计数据。 统计API部署地址如下：https://creodias.sentinel-hub.com/api/v1/statistics、https://services.sentinel-hub.com/api/v1/statistics 以及 https://services-uswest2.sentinel-hub.com/api/v1/statistics
