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Materials and Methods

1.1.3. Field Survey Data:

1.1.3.1. Ground Truth Data Collection:
This set of ground truth data will be used for image classification and validation. The homogeneous areas in the field are identified. The GPS is used for taking the coordinates of the area from where the reading is being collected. The field data is collected in the following ways:

1. 16 gardens chosen out of 64 gardens in the area based on high yield, medium yield and low yield. (4 gardens = high yield, 4 gardens = medium yield and 4 gardens = low yield).
2. Area was surveyed using GPS.
3. Areas of all the gardens were collected.
4. Leaf Area Index (LAI) collected using a plant canopy analyzer.
5. Management practices for the last 4 years were collected from all the 18 gardens.
6. Last 10 years yield data (1994-2004) of all the 64 gardens were collected from Tea Research Association, Jorhat, Assam.
7. Last 10 years meteorological data on daily and monthly basis were collected from Tea Research Association Sub Station, Rangapara, North Bank, Assam.
8. Soil information like the pH, carbon percent, potash and sulphur contents were collected from all the 18 gardens.
9. Time of irrigation and frequency of irrigation were also collected from all the 18 gardens.
10. All available maps of the gardens were collected.
11. The affected garden patches were identified. Two types of diseases found in the area are red spider mite attack and Helopeltis.