WQRS_NZ

A dataset of 153 in situ Chl$a$ measurements with Sentinel-3 OLCI matchups from 11 lakes in the central North Island of New Zealand. The lakes are of volcanic and riverine origin and encompass a range of bio-geo-optical types. Trophic states range from clear oligotrophic e.g., Lake Taupo, to hypereutrophic e.g., Lake Waikare, with extremely high turbidity resulting from sediment resuspension and algal biomass. The situ measurements were made under water quality monitoring programmes run by the regional councils of Waikato and Bay of Plenty, using standard fluorometric and spectroscopic methods, respectively, and hosted by and processed by Lakes And Land, Air, Water Aotearoa (LAWA). The top-of-atmosphere reflectance was atmospherically corrected with the C2RCC processor, resulting in 16 bands ranging from 400-1040 nm, specifically Oa01-Oa12, Oa16-Oa18 and Oa21. Satellite matchups have a 3-day tolerance window.本数据集包含新西兰北岛中部11个湖泊的153组原位（in situ）叶绿素a（Chlorophyll a, Chl a）实测数据，以及对应哨兵3号（Sentinel-3）海洋与陆地颜色仪（Ocean and Land Colour Instrument, OLCI）的星地匹配观测数据。这些湖泊兼具火山成因与河流成因属性，涵盖多种生物地球光学类型。湖泊营养状态跨度极大，从水质清澈的贫营养型湖泊（如陶波湖Lake Taupo）到因沉积物再悬浮与藻类生物量导致极高浊度的超富营养型湖泊（如怀卡雷湖Lake Waikare）均有覆盖。上述原位实测数据依托怀卡托与丰盛湾大区议会开展的水质监测项目获取，分别采用标准荧光法与光谱法完成测定，并由新西兰湖泊-陆地-大气-水平台（Lakes And Land, Air, Water Aotearoa, LAWA）进行托管与处理。卫星观测的大气层顶反射率经C2RCC处理器完成大气校正，得到覆盖400~1040 nm波段范围的16个光谱波段，具体为Oa01-Oa12、Oa16-Oa18及Oa21。星地匹配观测的时间容忍窗口为3天。