Monitoring Of Crop Phenology With Remote Sensing And Dynamic Change Analysis

Phenology is the science of the relationship between the time of occurrence of the various biological phenomenon of nature to cycle recurring, cyclical changes and environmental conditions. Phenological phases of crops is the crop to reach the corresponding date in the critical growth period. Crop phenological information not only reflect the local, prevailing environmental conditions, but also reflects the accumulation of environmental conditions over a period of time. Crops as part of the terrestrial ecosystems, phenological changes is impact by climate, hydrology and other factors, this change will directly affect the final yield of crops. Crop phenological information is an important agricultural information, agricultural production, field management, planning and decision-making is also based on crop simulation models parameters. To grasp the phenological variation in crop yield estimation, and forecasting farming season, monitoring, protecting the ecological environment, and prediction of climate change trends have important theoretical and practical significance. The Paper using the ENVI and ArcGIS software monitoring of Crop Phenology and dynamic change analysis, main contributions are the following:1. NOAA data as the main data source, with crop spectrum characteristic as the basis, using the time series NDVI data to monitor the key crop phonological period.2. There are many noise exist in the NDVI time series data.For example clouds, atmospheric, sensors and other factors. This paper use the maximum synthesis method and Savitzky-Golay filtering method of NDVI time series smoothing, reduce noise and improve data quality.3. Using the Logistic function fitting method, extraction of crop growth start, end period, studies have found that during the period1982-2000northeast area crop growth period and growth period beginning end slightly ahead of schedule, crop growth period in shorter time.4. Analysis of the period of1982-2000northeast crop phenological change trend, and combined with the meteorological data found that crop phenological change and temperature change is positive related. In recent years the rise in temperature, leading to crop growth initial period ahead of time.