Crop mapping starts with acquiring satellite images. Selection of satellite image for mapping completely depends upon user’s requirement. In case of regional mapping, then need to select low resolution satellite images.
But for detailed mapping at higher scale then one need to select high resolution satellite images. After acquiring satellite image, it should be corrected both radiometrically and geometrically (if require). Image enhancement can be performed to improve the quality of satellite image.
Crop health assessment and early monitoring are significant to ensure good production. Damage due to different reasons such as less moisture, insect attack etc. can be detected on time to overcome these damages by mitigation methods employ by farmer.
Satellite images are acquired on weekly basis to assess these damages and monitor crop health. Satellite images can be acquired throughout the growing season to assess the crop health and mitigate the damages.
For proper monitoring and assessment, it is important to acquire growing season time specific satellite images with high resolution and multi spectral capabilities.
Figure- Crop Monitoring Over Period Through FCC satellite image
To monitor, satellite image are acquired as per need then image processing tool are used to improve quality of image.
Normalized differential vegetation index (NDVI) can be vital tool to assess the crop health, as high NDVI value indicates good health of vegetation whereas low NDVI value shows poor crop health.
It is important to create information through remote sensing in a quick time of growing season to make this information useful for farmers. Otherwise this information will not be helpful for crop condition assessment.