Waiting for the snow to melt…
This dataset represents mean mid-day radiometric surface temperature ("skin temperature") of the Gothic Townsite from April 1st - October 31st of each year. The dataset covers the area surrounding Rocky Mountain Biological Laboratory, in Gothic, CO. Data was derived from thermal IR sensor data collected by an Uncrewed Aircraft System (UAS, e.g. "drone"). The sensor was a Micasense Altum v1 multispectral and thermal sensor attached to a quadcopter aircraft flying at 100m above the ground surface. Data has a nominal ground sample distance (pixel resolution) of approximately 50 cm, but is shared at 25 cm resolution to preserve fidelity of the orthorectification. Values represent surface temperature in degree Celsius. Mutlitspectral data at 5 cm resolution were also captured by the sensor at the same time as the thermal data, but these higher-resolution datasets are shared separately. Flights were conducted approximately weekly within 3 hours of solar noon, in full-sun conditions where possible. The flights typically take approximately 75 minutes to complete, and flightlines were oriented NNW-SSE at a 28m spacing, starting in the western proportion of the imaging area and progressing east. This means that western parts of the imaging area were typically imaged approximately 1-hour beore the eastern edges. Raw images were captured as 16-bit TIFF files approximately once every 1.2 seconds, providing approximately 75 percent forward overlap and 70 percent side overlap between adjacent images. For densely forested parts of the landscape, the forward speed of the aircraft was reduced to 8 m/sec to increase the forward overlap to 85%, improving orthomosaic performance for complex vegetation. Raw image data was georeferenced and orthorectified in Agisoft Metashape software (version 1.7), using information from the UAS system's Real-time Kinematic (RTK) global satellite navigation system as well as 8-15 ground-control points geolocated to within 2 cm. Independent assessment indicates a geographic precision of approximately 5 cm (Mean Absolute Error). Radiometric processing was performed using the manufacturer's reccomended method. In addition, a post-hoc thermal correction was applied, estimated using repeat measurements from a black-body plate and ice bath performed in August and September 2024. The linear calibration applied was: corrected_temp = raw_temp*0.9514 + 4.5921.
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