QX/T 266-2015 in English
VALIDSynchronous observation specification for sites radiometric calibration for optical sensors of meteorological satellites
- Issued on:2015-01-26
- Implemented on:2015-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$418.00
Introduction
Standard Background and Technical Evolution
With the development of the Fengyun satellite series, the quantitative application of optical remote sensors for meteorological satellites in my country has raised the requirement for radiation correction accuracy to 1-2%. As the first radiation correction observation standard specifically for meteorological satellites, QX/T 266-2015 integrates 15 years of measurement experience from the two major correction sites of Dunhuang (land site) and Qinghai Lake (surface site), and transforms the scientific research results from the "Ninth Five-Year Plan" to the "Twelfth Five-Year Plan" into standardized technical specifications.
Core Terminology Analysis
| Terms | Definition | Application Cases |
|---|---|---|
| Lambertian Property | The reflected radiation flux is proportional to the cosine of the surface normal | The reflectivity difference within a 15° observation angle at the Dunhuang site is ≤2% |
| Spectral Irradiance | The radiation flux received per unit area (W/m²·μm) | Direct irradiance in the 550nm band measured by a sun photometer |
| Optical Depth | Total attenuation due to absorption and scattering in the atmospheric path | Annual average aerosol optical thickness of Qinghai Lake site <0.15 |
Key technical indicators for site selection
Land site (Dunhuang)
- Area ≥12km×12km, slope ≤2°
- Reflectivity standard deviation ≤3% (350-2500nm)
- Annual number of sunny days ≥150 days
Surface site (Qinghai Lake)
- Water depth ≥20m, water quality meets Class I standard
- Vertical gradient of water temperature ≤0.5℃/km
- Equivalent noise temperature difference at 300K ≤0.2K
Instrument System Technical Requirements
| Instrument Type | Key Indicators | Typical Equipment |
|---|---|---|
| Field Spectrometer | Spectral Resolution≤3.5nm (VIS-NIR) | ASD FieldSpec |
| Sun Photometer | Channel Bandwidth≤10nm | CE318 |
| Infrared Radiometer | NETD≤0.05K@300K | IRIS |
Implementation recommendations
- Observation timing: 1 hour before and after satellite transit, solar zenith angle ≤ 55°
- Quality control: Daily comparison with reference standard plate, annual calibration cycle
- Data processing: Archive in QX/T 176-2012 format, including raw data and atmospheric correction results
- New technology integration: It is recommended to introduce drone aerial survey to improve spatial coverage efficiency
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