J.G.P. Clever and H.J.C van Leeuwen use microwave optical and remotely sensed data in combination for monitoring crop growth. They use a simple reflectance model to estimate leaf area index (LAI) from optical data, and a simple backscatter model to estimate LAI from radar data.
Subsequently, the synergistic effect of using optical and radar data for LAI estimation was analyzed by studying different data acquisition scenarios. Finally, remote sensing models were inverted to obtain LAI estimates during the growing season to calibrate the crop growth model against actual growing conditions 1. The US Department of Agriculture’s National Agricultural Statistics Service (NASS) conducts field interviews with sampled farmers and obtains crop cuttings to estimate crop yields at the regional and state levels. NASS needs additional spatial data that provides timely information on crop status and potential yields. In this research, the Erosion Productivity Impact Calculator (EPIC) model was adapted for regional scale simulations. Satellite remote sensing data provide a real-time assessment of the magnitude and variation of crop condition parameters. This study investigates the use of these parameters as inputs to a crop growth model. and image analysis in plant pathology.
It describes the technical methods and their possibilities, but also highlights the biological prerequisites and restrictions of practical applications 3. Yichun Xie. et al, use remote sensing imagery in vegetation mapping. They focus on comparisons between popular remote sensing sensors, commonly adopted image processing methods, and the predominant evaluation of classification accuracy. Mapping vegetation through remote sensing images involves various processes and techniques of examination. They first developed the vegetation classification to classify and map vegetation cover by remotely sensed images at either the community or species level 4. Harini Nagendra.
et al, GIS and Remote Sensing Application in Invasive Plant Monitoring. They discussed different applications in this area. GIS and remote sensing used to analyze the spatial distribution of certain entities in a vast landscape. They use both tools to understand the movement of invasive plants 5. Rajesh K Dhumal at work on the identification / differentiation of cultures of the same type. They use multispectral and hyper spectral images that contain spectral information about crops.
They use supervised and unsupervised classification techniques to map the geographic distribution of crop optical data and characterize cultural practices 6. Kyle W. Freeman uses prediction by the remote sensing station of corn forage biomass and nitrogen uptake at various stages of growth. His research shows that facility information can be collected and used to drive high resolution N applications 7.
Crop growth simulation models and the remote sensing method have great potential for monitoring crop growth and yield prediction. However, the culture model has limitations in regional application and remote sensing in describing the growth process. Ma Yuping uses the adjusted and regionalised WOFOST model for winter wheat in North China and coupled through the LAI to the SAIL-PROSPECT model to simulate the ground-adjusted vegetation index (SAVI) 8. The Erosion Productivity Impact Calculator (EPIC) model has been adopted for simulation at the regional scale. Satellite remote sensing data provide real-time assessment of the magnitude and variation of crop condition and parameters to study the use of these parameters in the crop growth model (Doraiswamy at el).
PCM (Precision Crop Management) is agricultural management, designed to target crop and soil inputs based on field needs to maximize profitability and protect the environment. Progress in GCP has been hampered by the lack of timely information on crop and soil conditions (M.S. Moran et al.
) 9. RM Johnston and MM Barson have developed techniques for