According to India’s National Remote Sensing Agency, “Remote Sensing is the technique of acquiring information about objects on the earth’s surface without physically coming into contact with them.”
- The energy comes down to the earth and a part is reflected and detected by a sensor;
- The detection is captured as data, which is sent to the receiving station;
- Some pre-processing takes place in the receiving station, and then the pre-processed data is handed over to the users;
- The users analyze the data for their own application.
Principle of Remote Sensing
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- TYPES :
- Passive Remote Sensing
- Active Remote Sensing
- Active remote sensors create their own electromagnetic energy that is transmitted from the sensor towards the terrain interacts with the terrain producing a backscatter of energy and it’s recorded by the remote sensor’s receiver.
- Passive sensor detects the naturally transmitted microwave energy within its field of view
Representation of types of sensing
APPLICATIONS OF RS IN AGRICULTURE:
- Identification, area estimation and monitoring
- Crop nutrient detection
- Soil mapping
- Crop condition assessment
- Agricultural drought assessment
- Crop yield modeling and production forecasting
- Identification of planting and harvesting dates
- Identification of pest and disease infestation
- Irrigation monitoring and management
PROS OF REMOTE SENSING:
- Good spectral and spatial resolution.
- Allows broad regional coverage.
- Allows continuous acquisition of data.
- Provides cost effective and map accurate data.
- Provides large archive of historical data.
LIMITATIONS OF REMOTE SENSING:
- Cost of data collection and data purchase is high.
- Problems with data analysis and interpretation.
- Problems with all weather capability as all sensors cannot see through clouds.
- Potential limitations with spatial, spectral and temporal resolutions of the various sensors.
- Remote sensing technology has developed from balloon photography to aerial photography to multi-spectral satellite imaging.
- Some of the benefits that can be gained from the use of remote sensing-
- Early identification to crop health and stress
- Ability to use this information to do remedial work on the problem
- Improve crop yield
- Crop yield predictions
- Reduce costs
- Reduce environmental impact
- Crop management to maximize returns through the season
Rayat Bahra University, Mohali