Overview
The research over the Guantao JECAM site focuses on the three topics: (1) crop identification and crop area estimation; (2) crop condition and crop stress monitoring; (3) crop yield estimation and prediction. To facilitate the above-mentioned research, multiple satellite imageries will be employed including both optical and SAR data. In situ data will be also acquired to support the model calibration and validation.
Project Objectives
Estimating Crop Area
Operational Implementation Plan
Field size measurement
Estimating Crop Conditions
Operational Implementation Plan
Crop Conditions
- Drought
- Biological Stress (including pest)
- Fallow mapping
- Crop departures from average
Forecasting Agricultural Variables
Operational Implementation Plan
Agricultural Variables (large scale)
Site Description
| Landscape Topography | Plain |
|---|---|
| Typical Field Size | 0.1-0.25 ha |
| Climatic Zone | Temperate, cool |
| Major Crops and Calendars | Winter Wheat (Normal): Maize (Normal): |
| Soil Type & Texture | Inorganic:
|
| Soil Drainage Class | |
| Irrigation Infrastructure | Flooding irrigation |
| Other Site Details | China Guantao JECAM site locates in the southern North China Plain (NCP), centered at 115°23’E, 36°37’N. Arable land accounts for approximately 70% of the county’s total area. Guantao is dominated by a typical warm, temperate, semi-humid continental monsoon climate. The Zhang and Yunwei Rivers, which lie across the county, provide irrigation water for agriculture. The traditional tillage practice is dominated by the two-season cropping of winter wheat and summer maize. In general, wheat is sown in mid or late October and harvested in late May or early June of the following year, and maize is planted in mid or late June and harvested in late September or early October. |
In Situ Observations
Spectral reflectance
- Crop Type(s): Winter Wheat, Maize
- Collection Protocol:
Field spectrum measurements are conducted from 10:30 to 14:00 on sunny, windless days using HR-768 portable spectroradiometer.
- Frequency: monthly
Canopy chlorophyll content
- Crop Type(s): Winter Wheat, Maize
- Collection Protocol:
Canopy chlorophyll content are measured over at least 10 leaves randomly selected over each plot using SPAD 502 Plus. The measurements will be conducted from tillering stage to grain-filling stage for wheat and from enlongation to pre-havest period.
- Frequency: monthly
FPAR & LAI
- Crop Type(s): Winter Wheat, Maize
- Collection Protocol:
FPAR and LAI will be measured using SUNSCAN Canopy Analysis system which will be repeated five times at each plot. The measurements follow the standard guidelines of the SUNSCAN.
- Frequency: monthly
Above ground biomass(AGB)
- Crop Type(s): Winter Wheat, Maize
- Collection Protocol:
Above ground biomass (AGB) will be measured after oven dried and weighting. All crop plants within a 0.5*0.5 m areas will be cutted and collected during field survey. Two cuttings will be carried out at each plot.
- Frequency: Monthly
Crop yield and harvest index
- Crop Type(s): Winter Wheat, Maize
- Collection Protocol:
Same as the AGB measurements, yield will be measured only at the maturity stage. All seeds within a 0.5*0.5 m areas will be collected during field survey. Two cuttings will be carried out at each plot. The seeds could be either oven dried or sun-dried. Harvest index will be derived by the final yield to ABG during the maturity stage.
- Frequency: Seasonal
EO Data
Optical Data Requirements
SAR Data Requirements
Passive Microwave Data Requirements
Thermal Data Requirements
Results
Documents and Files
Links to paper
Project Reports
Study Team
Team Leader
Other Team Members