Solar and sensor geometry, not vegetation response, drive satellite NDVI phenology in widespread ecosystems of the western United States
Norris JR and Walker JJ. 2020. Solar and sensor geometry, not vegetation response, drive satellite NDVI phenology in widespread ecosystems of the western United States. Remote Sensing of Environment. 249(November 2020)
US National Park Service monitoring of evergreen pinyon-juniper ecosystems in the western US revealed an unexpected winter-peaking phenological pattern in normalized difference vegetation index (NDVI) time-series derived from Moderate Resolution Imaging Spectroradiometer (MODIS) imagery. In this paper, we assess the validity of the winter peaks through ground-based observation of phenology and examination of solar and satellite geometry effects.
- Type
- Journal Article
- Authors
- Norris, Jodi; Walker, Jessica
- Units
- AZRU , BAND , CACH , CHCU , ELMA , ELMO , GLCA , GRCA , HUTR , MEVE , NAVA , PEFO , PETR , RABR , SAPU , SCPN , SUCR , WACA , WUPA , YUHO
- Keywords
- Google Earth Engine, Landsat, MODIS, NDVI, Phenocam, Phenology, Pinyon-juniper, Sentinel, VIIRS
- Subjects
- Ecological Framework: Biological Integrity | Focal Species or Communities | Forest/Woodland Communities