This PR introduces the hand filter and landcover extension techniques.
The HAND filter estimates the hand values along the water boundaries and detects the abnormal values from them, and erode the water bodies until all the values are within the conditions.
The landcover extension extends the dark land areas. Previously, the dark land candidates are extracted from the reference water, land cover, and low-backscattering. However, some landcover may have different characteristics depending on the season. So, the new implementation is designed to extend the masking areas where the some land covers (i.e. grass land and Shrubs) are spatially connected to the bare/sparse vegetation under the assumption that the grass land or shrubs can behave like the dark lands.
This PR introduces the hand filter and landcover extension techniques.
The
HAND filterestimates the hand values along the water boundaries and detects the abnormal values from them, and erode the water bodies until all the values are within the conditions.The
landcover extensionextends the dark land areas. Previously, the dark land candidates are extracted from thereference water,land cover, andlow-backscattering. However, some landcover may have different characteristics depending on the season. So, the new implementation is designed to extend the masking areas where the some land covers (i.e. grass land and Shrubs) are spatially connected to thebare/sparse vegetationunder the assumption that the grass land or shrubs can behave like the dark lands.