Bachoo, AArchibald, S2007-11-152007-11-152007-07Bachoo, A and Archibald, S. 2007. Influence of using date-specific values when extracting phenological metrics from 8-day composite NDVI data. International workshop on the analysis of multi-temporal remote sensing images, 2007. Multitemp 2007 IEEE Conference. Leuven, Belgium, 18-20 July 2007, pp 4http://hdl.handle.net/10204/16062007: IEEE Conference. Leuven, BelgiumInformation of vegetation dynamics derived from remotely sensed data is essential for regional natural resource management. A common approach involves using an n-day composite time-series of normalized difference vegetation index (NDVI) satellite data for estimating vegetation phenology. The composite method was introduced to deal with problems associated with cloudy and noisy data but could possibly obscure the fine-scale timing of vegetation processes like leaf out and leaf drop, which can occur suddenly, often within a few days. Moreover, different methods for smoothing the NDVI curves also influence the accuracy of the vegetation parameters extracted from them. The auhtors investigate the difference between 8-day equalinterval (standard composite data) and 8-day date-specific NDVI data in their ability to extract phenological metrics of interest for ecologists and land managers. They also compare two different filtering algorithms - the Savitsky-Golay and the Gaussian filtering algorithms. Results from a typical savanna system in South Africa show that the Savitsky-Golay technique with date-specific NDVI values is the best methodenRemote sensed dataNDVINormalized difference vegetation indexDate-specific valuesVegetation phenologyIEEE Conference. Leuven, Belgium. 18-20 Jul 2007Conference PresentationBachoo, A., & Archibald, S. (2007). Influence of using date-specific values when extracting phenological metrics from 8-day composite NDVI data. http://hdl.handle.net/10204/1606Bachoo, A, and S Archibald. "Influence of using date-specific values when extracting phenological metrics from 8-day composite NDVI data." (2007): http://hdl.handle.net/10204/1606Bachoo A, Archibald S, Influence of using date-specific values when extracting phenological metrics from 8-day composite NDVI data; 2007. http://hdl.handle.net/10204/1606 .TY - Conference Presentation AU - Bachoo, A AU - Archibald, S AB - Information of vegetation dynamics derived from remotely sensed data is essential for regional natural resource management. A common approach involves using an n-day composite time-series of normalized difference vegetation index (NDVI) satellite data for estimating vegetation phenology. The composite method was introduced to deal with problems associated with cloudy and noisy data but could possibly obscure the fine-scale timing of vegetation processes like leaf out and leaf drop, which can occur suddenly, often within a few days. Moreover, different methods for smoothing the NDVI curves also influence the accuracy of the vegetation parameters extracted from them. The auhtors investigate the difference between 8-day equalinterval (standard composite data) and 8-day date-specific NDVI data in their ability to extract phenological metrics of interest for ecologists and land managers. They also compare two different filtering algorithms - the Savitsky-Golay and the Gaussian filtering algorithms. Results from a typical savanna system in South Africa show that the Savitsky-Golay technique with date-specific NDVI values is the best method DA - 2007-07 DB - ResearchSpace DP - CSIR KW - Remote sensed data KW - NDVI KW - Normalized difference vegetation index KW - Date-specific values KW - Vegetation phenology KW - IEEE Conference. Leuven, Belgium. 18-20 Jul 2007 LK - https://researchspace.csir.co.za PY - 2007 T1 - Influence of using date-specific values when extracting phenological metrics from 8-day composite NDVI data TI - Influence of using date-specific values when extracting phenological metrics from 8-day composite NDVI data UR - http://hdl.handle.net/10204/1606 ER -