4 results about "Green band" patented technology

The application discloses a kind of based on sentinel-2 satellite image's duckweed type eutrophication water monitoring method, it is related to water monitoring technical field, including the following steps: after the atmospheric correction processing of sentinel-2 L1 C level satellite image of non-duckweed growing season and duckweed growing season, all wavebands are resampled to the same resolution, after mean filtering to the blue band, green band, red band, near infrared band, narrow near infrared band of multi-band surface reflectance image after resampling of non-duckweed growing season and duckweed growing season, then band synthesis is carried out, obtain non-duckweed growing season band synthesis image and duckweed growing season band synthesis image;The proportion of duckweed growing range in water range is calculated using non-duckweed growing season band synthesis image and duckweed growing season band synthesis image.The present application can realize the fast, large-scale, low-cost duckweed type eutrophication water monitoring.

This invention provides a method and system for shallow water depth inversion based on multi-temporal satellite imagery guided by laser bathymetry. The method includes: extracting water body pixels from Sentinel-2 imagery; extracting water depth photons from satellite-borne laser bathymetry data and performing refraction correction to obtain water depth values ​​along the orbital direction; utilizing the strong correlation between the water depth values ​​along the orbital direction and the reflectivity of the blue and green bands of Sentinel-2 imagery to calculate multi-temporal image fusion weights and generate a weighted fused image; based on water column layer-by-layer inversion and / or seabed classification inversion strategies, dividing the weighted fused image into multiple homogeneous regions according to the water penetration capabilities of blue and green light; using LLM and / or LRM to invert water depth layer by layer in the multiple homogeneous regions; and fusing the results of different regions through a buffer zone to obtain the water depth inversion result for the entire shallow sea area. This invention can achieve high-precision and high-stability shallow water depth inversion.

This invention provides a dynamic monitoring technology for characteristic parameters of reservoirs in sediment-rich rivers based on remote sensing interpretation and multi-source data fusion, belonging to the field of water conservancy engineering monitoring technology. The technology includes the following steps: S1: Remote sensing image acquisition and preprocessing; S2: Water area extraction, fusing green band and shortwave infrared band, and calculating the improved normalized difference water index; S3: Constructing a water level inversion model, integrating preprocessed daily-scale measured water level data with the concurrent water area extracted in step S2, and dividing it into training and validation sets; S4: Calculating the dynamic water storage of the reservoir; S5: Constructing a sediment concentration inversion model, integrating preprocessed daily-scale measured sediment concentration data to construct a sediment concentration inversion model. This invention uses remote sensing interpretation to achieve automated, long-term, and large-scale continuous monitoring of water and sediment parameters in sediment-rich reservoirs, significantly improving monitoring efficiency; reducing manpower and material costs, and providing technological innovation for watershed-scale dynamic water and sediment perception.

This invention relates to the field of light-emitting diode (LED) technology, specifically disclosing a blue-green dual-band LED epitaxial wafer and its fabrication method, as well as an LED. The blue-green dual-band LED epitaxial wafer includes a substrate, on which a buffer layer, an N-type semiconductor layer, a stress relief layer, a green multi-quantum-well emitting layer, a quantum-well stress modulation layer, a blue multi-quantum-well emitting layer, an electron blocking layer, and a P-type semiconductor layer are sequentially disposed. The blue-green dual-band LED epitaxial wafer provided by this invention can simultaneously excite LED light sources in both blue and green bands, thereby reducing the cost of RGB-LED backlight sources and reducing the use of phosphors in white LED backlight sources.