China-Guantao

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 TopographyPlain
    Typical Field Size0.1-0.25 ha
    Climatic ZoneTemperate, cool
    Major Crops and Calendars

    Winter Wheat (Normal):
    Calendar: October - May
    Typical Rotation: Winter wheat and summer maize double-cropping system

    Maize (Normal):
    Calendar: June - September
    Typical Rotation: Winter wheat and summer maize double-cropping system

    Soil Type & Texture

    Inorganic:

    • Clay Loam
    Soil Drainage Class
    Irrigation InfrastructureFlooding 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

  • Approximate Start Date of Acquisition: 01/10
  • Approximate End Date of Acquisition: 30/09
  • Spatial resolution: Medium resolution (20-60m)High resolution (5-20m)
  • temporal_frequency: WeeklyBiweeklyMonthly
  • Level of Expertise: IntermediateAdvance
  • Latency of Data Delivery: More than 5 days
  • Challanges: Considering the high frequency of cloudy and rainy weather during the rainy season, the availability of optical data might be a challenge.
  • SAR Data Requirements

  • Approximate Start Date of Acquisition: 01/10
  • Approximate End Date of Acquisition: 30/09
  • Spatial resolution: Medium resolution (20-60m)High resolution (5-20m)
  • temporal_frequency: BiweeklyMonthly
  • Frequency: XCP
  • Incidence Angle: Medium
  • Polarisation:
  • Level of Processing: Level 2
  • Orbit: Any
  • Level of Expertise: IntermediateAdvance
  • Latency of Data Delivery: More than 5 days
  • Challanges: The comparability of SAR data with ascending and descending orbits from same satellite might be a issue.
  • Passive Microwave Data Requirements

    Thermal Data Requirements

    Results

    Documents and Files

    Links to paper

    Project Reports

    Study Team

    Team Leader

  • Name: Wu Bingfang
  • Affiliation: Aerospace Information Research Institute, Chinese Academy of Sciences
  • Affiliation Webpage: http://www.aircas.ac.cn
  • Position: Professor
  • Email: wubf@aircas.ac.cn
  • Personal Webpage:
  • Phone number:
  • Postal Address:
  • Other Team Members

  • Name: Miao Zhang
  • Affiliation: Aerospace Information Research Institute, Chinese Academy of Sciences
  • Affiliation Webpage: http://www.aircas.ac.cn
  • Position: Associate Professor
  • Email: zhangmiao@aircas.ac.cn
  • Personal Webpage:
  • Role: Member
  • Name: Hongwei Zeng
  • Affiliation: Aerospace Information Research Institute, Chinese Academy of Sciences
  • Affiliation Webpage: http://www.aircas.ac.cn
  • Position: Associate Professor
  • Email: zenghw@aircas.ac.cn
  • Personal Webpage:
  • Role: Member