DOI: 10.25405/data.ncl.30009769.v1
title: Data for output replication: Addressing how spatial resolution affects image velocimetry outputs:implications for measurements from space

description: <b>Description</b>This dataset supports the article “Addressing how spatial resolution affects image velocimetry outputs: implications for measurements from space”. It provides all results, scripts, and figures required to enable replication of the published outputs and to facilitate further analysis.The dataset includes:Results: Outputs from image velocimetry experiments at the Androscoggin River (ACR) and Agua Fria River (AFR). Experiments test the sensitivity of tracer-based velocity and discharge estimates to variations in spatial resolution (0.0279–3.0 m) and temporal sampling frequency (0.25–23.98 Hz). Results include velocity outputs (.csv), discharge summary reports (.html, .pdf), particle trajectory plots (.svg), and ADCP reference measurements (.xlsx, .csv).ACR_Bathymetry: Field-based reference data collected at the Androscoggin River site. This folder contains a QRev discharge report (.pdf), a bathymetry survey (.csv), and a velocity profile across the channel cross-section (.txt). These data provide ground-truth context for evaluating image velocimetry outputs.MATLAB scripts: Code used for video preprocessing (frame rate reduction, rescaling, image pair extraction) and for reproducing figures presented in the article.Figures: All figures from the article, provided in high-resolution formats with documented workflows.<br><b>Source videos</b>The input UAS videos and aDcp data used for these analyses are not included here but can be accessed via:Engel, F., Cadogan, A., and Duan, J. (2022). Small unoccupied aircraft system imagery and associated data used for discharge measurement at eight locations across the United States in 2019 and 2020. U.S. Geological Survey data release. https://doi.org/10.5066/P9H2MM1M<br><b>Software</b>Image velocimetry analysis was performed using the KLT-IV software, specifically the satellite-exp branch at commit 5132c68 (https://github.com/CatchmentSci/KLT-IV/tree/5132c68).This commit reflects the exact version used in the analyses and ensures reproducibility of the outputs provided here.For further details on the software, see:Perks, M. T. (2020). KLT-IV v1.0: image velocimetry software for use with fixed and mobile platforms. Geoscientific Model Development, 13, 6111–6130. https://doi.org/10.5194/gmd-13-6111-2020<br><b>Organisation</b>Files are grouped into three main components:Results: Subdivided by site (ACR, AFR), resolution, and frame rate.ACR_Bathymetry: Field-based discharge and channel survey data for the Androscoggin River siteMATLAB Scripts: MATLAB code for preprocessing and figure reproduction.Figures: Final figures used in the manuscript, with descriptions of their preparation.<br><b>Intended use</b>The dataset enables reproducibility of the published study and provides a resource for further testing of image velocimetry methods under varying resolution conditions. It may be used for methodological benchmarking, hydrodynamic model validation, or the design of remote sensing applications.This dataset supports the article “Addressing how spatial resolution affects image velocimetry outputs – implications for measurements from space”. It provides all results, scripts, and figures required to enable full replication of the published outputs and to facilitate further analysis.<br>