Spectral Measurements of Daylight and Natural Objects in Japan

A 2022 dataset from Japan contains spectral reflectance data for 359 natural objects and transmittance data for 75 leaves, alongside daylight measurements. Daylight data includes 359 time-lapse measurements from dawn to dusk and 118 measurements from five different environmental locations. The dataset was created by researchers at the University of Oxford and is associated with a publication in Optics Express.

Use Cases

• Modeling spectral reflectance of natural materials based on the 359 measured objects.
• Analyzing daylight spectral composition variation over time based on the time-lapse measurements.
• Studying the influence of surrounding environments on daylight based on measurements from five distinct locations.
• Developing models for leaf light transmission based on the transmittance data for 75 leaves.

Strengths

• Includes spectral data for 359 distinct natural objects, categorized into flowers, leaves, fruits, vegetables, barks, and stones.
• Contains 359 time-lapse daylight measurements and 118 location-specific daylight measurements.
• Provides both reflectance and transmittance data with associated sample photos.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Last update date is unknown; freshness unverified.

Provenance

Source

University of Oxford

Collection Method

Measured using a spectrophotometer (SR-2A, Topcon, Tokyo, Japan).

Time Range

Measurements taken in 2022.

Geography

Japan