Airborne Thermal Infrared and High-resolution True-color Imagery and Longitudinal Profiles of Stream Temperatures, Santiam River Basin, Oregon, Summer 2024

This dataset includes georeferenced, high-resolution, airborne thermal infrared (TIR) and high-resolution true-color (RGB) imagery, a polyline shapefile of the channel centerline, a shapefile with TIR sample points for longitudinal stream temperature profile data, and a tabular file with longitudinal stream temperature profile data for the Santiam River basin and its tributaries, Oregon. The aerial surveys were conducted with a helicopter by NV5 Geospatial and are published as paired TIR and true-color raster mosaics in GeoTiff format with a resolution of 0.3 meters (m). The TIR mosaics contain corrected surface temperatures in degrees Celsius (C) (multiplied by 10 to create an unsigned integer pixel type). The longitudinal stream temperature profile data have temperatures in degrees C. The TIR dataset encompasses 174 kilometers (km) of the Santiam River and its tributaries. The TIR surveys were collected during the afternoons (12:50-17:15 Pacific Daylight Time [PDT]) of July 27, and 31, August 1, and 2, and September 5, 2024. The TIR surveys were calibrated using temperature data from loggers deployed at 17 in-stream locations distributed longitudinally throughout the survey area. The true-color imagery is published as 6 raster mosaics in MrSID (Multi-resolution Seamless Image Database) file format of the entire surveyed upper Santiam River basin stream network with a resolution of 0.15 m. Channel centerlines were manually digitized from georectified thermal orthomosaics within a geographic information system. Stream temperatures for longitudinal profiles were sampled using an automated method along the channel centerline from the TIR imagery.