Seasonal supraglacial ponds for 8 glaciers in High Mountain Asia between 2019 - 2023 during ablation period.

Seasonal pond dataset: multi-temporal supraglacial pond delineations on eight glaciers of High Mountain Asia Overview. This dataset contains multi-temporal supraglacial pond delineations for eight glaciers in High Mountain Asia, mapped from Sentinel-2 imagery for August, September and October of each year from 2019 to 2023. It documents the intra-seasonal and interannual variability of supraglacial ponds. It was built to assess how the timing of image acquisition affects pond inventories, as a supplementary part of HMA scale delineation of static 2022 single season supraglacial pond inventory https://doi.org/10.5281/zenodo.23170928 (Ahmad. et al., 2026). Study glaciers. The eight glaciers were selected to span the main regions of High Mountain Asia: the Central, Western and Eastern Himalaya, the Hindu Kush, the Karakoram, the Western Kunlun, the Tien Shan and the Pamirs. Delineation method. Ponds were delineated with the Normalized Difference Water Index (NDWI), computed from Sentinel-2 [green and near-infrared bands, 10 m], with a fixed threshold of 0.11. The thresholded outputs were then manually cleaned to remove false detections [such as shadows and wet debris]. The uncleaned ponds are provided as well for the comparison purposes. Contents. For the selected glaciers, the dataset provides: Seasonal pond polygons (shapefiles), one per month (August, September, October) and year (2019–2023). Glacier boundary (shapefile) [source: RGI v7]. NDWI rasters used for delineation. RGB composites of the source imagery (Sentinel-2 L1C Harmonized collection). Uncleaned pond polygons, i.e. the NDWI-thresholded output before manual cleaning. Tables (CSV) of slope and elevation per pond [derived from GLO 30m DEM]. Intended use. The dataset supports the analysis of seasonal and interannual pond variability, the sensitivity of pond area and number to acquisition month. Technical notes. Coordinate system: [Albers Equal Area North Conic Projection (meters)]. Format: ESRI Shapefile, GeoTIFF, CSVs. Naming convention: [glacier_year_month]. Minimum mapped pond area: [500m^2]. Scene selection and cloud handling: [Metadata files in CSV format]. Spatial resolution: 10 m. Sub-resolution ponds near the mapping threshold are not resolved.