{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,18]],"date-time":"2025-11-18T12:30:00Z","timestamp":1763469000671,"version":"build-2065373602"},"reference-count":53,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2024,10,9]],"date-time":"2024-10-09T00:00:00Z","timestamp":1728432000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"U.S. Army Corps of Engineers Missouri River Recovery Program"},{"name":"USGS Ecosystems Mission Area"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Rivers convey a broad range of materials, such as sediment, nutrients, and contaminants. Much of this transport can occur during or immediately after an episodic, pulsed event like a flood or an oil spill. Understanding the flow processes that influence the motion of these substances is important for managing water resources and conserving aquatic ecosystems. This study introduces a new remote sensing framework for characterizing dynamic phenomena at the scale of a channel cross-section: Hyperspectral Image Transects during Transient Events in Rivers (HITTER). We present a workflow that uses repeated hyperspectral scan lines acquired from a hovering uncrewed aircraft system (UAS) to quantify how a water attribute of interest varies laterally across the river and evolves over time. Data from a tracer experiment on the Missouri River are used to illustrate the components of the end-to-end processing chain we used to quantify the passage of a visible dye. The framework is intended to be flexible and could be applied in a number of different contexts. The results of this initial proof-of-concept investigation suggest that HITTER could potentially provide insight regarding the dispersion of a range of materials in rivers, which would facilitate ecological and geomorphic studies and help inform management.<\/jats:p>","DOI":"10.3390\/rs16193743","type":"journal-article","created":{"date-parts":[[2024,10,9]],"date-time":"2024-10-09T07:39:52Z","timestamp":1728459592000},"page":"3743","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Hyperspectral Image Transects during Transient Events in Rivers (HITTER): Framework Development and Application to a Tracer Experiment on the Missouri River, USA"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0940-8013","authenticated-orcid":false,"given":"Carl J.","family":"Legleiter","sequence":"first","affiliation":[{"name":"U.S. Geological Survey Observing Systems Division, Golden, CO 80403, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2085-1449","authenticated-orcid":false,"given":"Victoria M.","family":"Scholl","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey National Uncrewed Systems Office, Geosciences and Environmental Change Science Center, Lakewood, CO 80225, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7999-9547","authenticated-orcid":false,"given":"Brandon J.","family":"Sansom","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey Columbia Environmental Research Center, Columbia, MO 65201, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3487-4972","authenticated-orcid":false,"given":"Matthew A.","family":"Burgess","sequence":"additional","affiliation":[{"name":"U.S. Geological Survey National Uncrewed Systems Office, Geosciences and Environmental Change Science Center, Lakewood, CO 80225, USA"}]}],"member":"1968","published-online":{"date-parts":[[2024,10,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Ji, C., Beegle-Krause, C.J., and Englehardt, J.D. 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