FAQ
Q
Stripes included in SGLI products
A
Striped patterns may appear in observed images and higher-level products due to slight performance changes (e.g., gain, offset, noise) in specific pixels used for observation. These stripes in higher-level products depend on the channels (wavelengths) used to calculate the product.
The 19 channels observed by SHIKISAI can be broadly divided into those that observe sunlight reflection and those that observe thermal radiation from the Earth. The appearance of striped patterns in the observed images varies depending on the channels used.
The 19 channels observed by SHIKISAI can be broadly divided into those that observe sunlight reflection and those that observe thermal radiation from the Earth. The appearance of striped patterns in the observed images varies depending on the channels used.
- Channels for observing sunlight reflection (VN, PL, SWI; a total of 17 channels) These channels are primarily used for calculations involving chlorophyll-a concentration, phytoplankton, vegetation indices, snow and ice, among others.
- Channels for observing thermal radiation from Earth (TIR; a total of 2 channels) These channels are primarily used for temperature measurements such as Sea Surface Temperature (SST) and Land Surface Temperature (LST). Below are examples of stripe patterns occurring in Sea Surface Temperature (SST) and Land Surface Temperature (LST).
Among these, particularly in relatively dark targets such as chlorophyll-a concentration and phytoplankton, stripe patterns occur prominently.
Below is an example of stripe patterns occurring in phytoplankton (FAI).
Last update: 2024/06/14