IVyTools discharge and uncertainty results for eight benchmark image velocimetry videos

This data release contains image velocimetry results derived from the publicly available Video Globe Challenge 2020 (VGC2020) dataset, processed using the U.S. Geological Survey's IVyTools software application (version 1.4.0.0). The original VGC2020 dataset includes eight videos of riverine flow conditions, each accompanied by reference discharge values and associated uncertainties. In this data release, the eight videos were reanalyzed using IVyTools, which applies Space-Time Image Velocimetry (STIV) techniques to estimate surface water velocities and compute discharge. The release includes: (1) per-site discharge station tables summarizing the midsection discharge computation at each measurement station; (2) per-site STIV velocity results tables containing the pixel-level velocity vectors computed by the STIV algorithm; (3) per-site STI (Space-Time Image) review tables documenting the STIV streak angles, auto-detected and manually corrected velocity magnitudes, and operator comments for each grid node; (4) summary comparison tables presenting IVyTools discharge estimates alongside VGC2020 reference values and uncertainty metrics (corresponding to Tables 2 and 3 in Engel and others, 2026); and (5) uncertainty contribution analysis data indicating the fractional contribution of each uncertainty component to total discharge variance for all eight sites (corresponding to Figure 6 in Engel and others, 2026). This dataset supports reproducibility and transparency in image-based streamflow measurement and contributes to ongoing efforts to evaluate operator and software effects in video-based hydrometry. Data are organized into child items based on data type and purpose: <ul> <li><strong>Ancillary Scripts:</strong> Python scripts used to extract uncertainty data from IVyTools project files and to generate the uncertainty contribution figure.</li> <li><strong>IVyTools Results:</strong> Per-site discharge station tables, STIV velocity results, and STI review tables extracted from IVyTools project files for each of the eight VGC2020 videos.</li> <li><strong>Summary Tables:</strong> Tabular summaries comparing IVyTools discharge and uncertainty results to VGC2020 reference values.</li> <li><strong>Uncertainty Analysis:</strong> Extracted uncertainty component data.</li> </ul> Each site in the VGC2020 dataset is identified by the following abbreviations used throughout this data release: <ul> <li>GDH1: Video Globe Challenge 2020, Video 1 (Vence, France)</li> <li>GDH2: Video Globe Challenge 2020, Video 2 (Roxton Falls, Canada)</li> <li>GDH3: Video Globe Challenge 2020, Video 3 (Tana, Norway)</li> <li>GDH4: Video Globe Challenge 2020, Video 4 (Åseral, Norway)</li> <li>GDH5: Video Globe Challenge 2020, Video 5 (Le Gier, France)</li> <li>GDH6: Video Globe Challenge 2020, Video 6 (Tana, Norway)</li> <li>GDH7: Video Globe Challenge 2020, Video 7 (Brisbane, Australia)</li> <li>GDH8: Video Globe Challenge 2020, Video 8 (Vence, France)</li> </ul>

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