Plant species occurrence in the upper to mid Tana River Basin based on specimen records at the East African Herbarium (EA), Nairobi, Kenya

The dataset contains plant species occurrence records in the upper to mid Tana River Basin, digitized from preserved specimens at the East African Herbarium (EA), Nairobi. The dataset is a subset of the EA BRAHMS database generated over several years through various projects and day-to-day digitization efforts. Specimen records from the Tana River Basin were extracted from the EA BRAHMS dataset then cleaned and formatted in Darwin Core Standard. Data cleaning was done using Open Refine Software as well as the GPS Visualizer tool to generate altitude values from coordinates. Elevation data from GPS Visualizer is controlled from a variety of reputable sources including SRTM, ASTER, USGS and Google Maps. Other cleaning tasks included correcting spellings, filling in missing data, checking the taxonomy, dates, and subnational administrative areas. Records without coordinates were georeferenced using GEOLocate, Google Maps, and Gazetteers. The field altitude (m) was automatically generated from GPS Visualizer (https://www.gpsvisualizer.com/elevation) to generate missing elevation values. The process involved uploading a CSV format file with latitude and longitude values to the website which then sampled these coordinates against inbuilt elevation profile files (Digital Elevation Models) to give altitude values at specified coordinates. Most coordinates were also retrieved from gazetteers as they are legacy data.

本数据集收录了上中塔纳河流域的植物物种分布记录，这些记录源自内罗毕东非植物园（EA）保存的标本进行数字化处理。该数据集是东非植物园BRAHMS数据库的子集，该数据库通过多年的各类项目和日常数字化工作生成。塔纳河流域的标本记录自EA BRAHMS数据集中提取，经过清洗和格式化为达尔文核心标准。数据清洗工作采用Open Refine软件以及GPS Visualizer工具从坐标生成海拔值。GPS Visualizer的海拔数据受到包括SRTM、ASTER、USGS和谷歌地图在内的多个信誉良好的数据源的控制。其他清洗任务包括纠正拼写、补充缺失数据、核对分类学、日期和次国家行政区域。无坐标的记录通过GEOLocate、谷歌地图和地名志进行地理参照。现场海拔（米）自动由GPS Visualizer（https://www.gpsvisualizer.com/elevation）生成，以填补缺失的海拔值。该过程涉及上传包含纬度和经度值的CSV格式文件至网站，网站随后将坐标与内置的海拔剖面文件（数字高程模型）进行采样，以在指定坐标处提供海拔值。大多数坐标也来源于地名志，因为这些数据为历史数据。