Spanner, M. A. (1994). Optical Thickness Data: Ground (OTTER) (Version 1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/65 Date Accessed: 2026-10-28

@article{spanner_1994, title={Optical Thickness Data: Ground (OTTER)}, url={https://www.earthdata.nasa.gov/data/catalog/ornl-cloud-fieldsunp-65-1}, DOI={10.3334/ORNLDAAC/65}, abstractNote={Field sunphotometer data collected on 8/13-15/90 used to provide quantitative atmospheric correction to remotely sensed data of forest reflectance and radiance}, publisher={ORNL Distributed Active Archive Center}, author={Spanner, M.A.}, year={1994}, language={en}, }

Spanner, M. A. (1994). Optical Thickness Data: Ground (OTTER) (Version 1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/65 Date Accessed: 2026-10-28

Spanner, M.A. “Optical Thickness Data: Ground (OTTER).” With ORNL DAAC, Version 1, ORNL Distributed Active Archive Center, 1 Jan. 1994, https://doi.org/10.3334/ORNLDAAC/65. Date Accessed: 2026-10-28