{"doi":"10.5194/amtd-7-69-2014","title":"Validation of spectral sky radiance derived from all-sky camera images –  a case study","abstract":"<jats:p>Abstract. Spectral sky radiance (380–760 nm) is derived from measurements with a Hemispherical Sky Imager (HSI) system. The HSI consists of a commercial compact CCD (charge coupled device) camera equipped with a fish-eye lens and provides hemispherical sky images in three reference bands such as red, green and blue. To obtain the spectral sky radiance from these images non-linear regression functions for various sky conditions have been derived. The camera-based spectral sky radiance was validated by spectral sky radiance measured with a CCD spectroradiometer. The spectral sky radiance for complete distribution over the hemisphere between both instruments deviates by less than 20% at 500 nm for all sky conditions and for zenith angles less than 80°. The reconstructed spectra of the wavelength 380 nm to 760 nm between both instruments at various directions deviate by less then 20% for all sky conditions.</jats:p>","journal":null,"year":null,"id":38080,"datarank":0.10397207708399181,"base_score":0.6931471805599453,"endowment":0.6931471805599453,"self_citation_contribution":0.10397207708399181,"citation_network_contribution":0.0,"self_endowment_contribution":0.10397207708399181,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":1,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":null,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":189513,"name":"M. Schrempf","orcid":null,"position":1,"is_corresponding":false},{"id":189514,"name":"S. Riechelmann","orcid":null,"position":2,"is_corresponding":false},{"id":189515,"name":"G. Seckmeyer","orcid":"0000-0002-1869-6398","position":3,"is_corresponding":false},{"id":189512,"name":"K. Tohsing","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"base_score":0.6931471805599453,"endowment":0.6931471805599453,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"18998881","pmcid":null,"openalex_id":"https://openalex.org/W4234915953","authors":[],"funders":[],"total_grants":0,"fwci":0.0,"citation_percentile":0.36303567,"influential_citations":0,"citation_trend":[{"year":2021,"count":1}],"oa_status":"gold","license":"cc-by","oa_locations":[{"url":"https://doi.org/10.5194/amtd-7-69-2014","host_type":""},{"url":"https://doi.org/10.5194/amtd-7-69-2014","host_type":""},{"url":"https://amt.copernicus.org/preprints/7/69/2014/amtd-7-69-2014.pdf","host_type":"publisher"}],"fields_of_study":["Impact of Light on Environment and Health","Calibration and Measurement Techniques","Urban Heat Island Mitigation"],"mesh_terms":[],"keywords":["Radiance","Sky","Spectroradiometer","Remote sensing","Zenith","Sky brightness","Diffuse sky radiation","Spectral bands","Optics","Physics","Environmental science","Geography","Astronomy","Reflectivity"],"sdg_mappings":[{"sdg_number":0,"sdg_label":"Life below water"}],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-06-11T00:14:05.770500Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}