1.5.1.1.4.1.4. polar2grid.filters.day_night module

Filter classes for making decisions based on day or night percentages.

class polar2grid.filters.day_night.DayCoverageFilter(product_filter_criteria: Optional[dict] = None, sza_threshold: float = 100.0, day_fraction: float = 0.1)

Bases: SunlightCoverageFilter

Remove certain products when there is not enough day data.

FILTER_MSG = "Unloading '{}' because there is not enough day data."

_should_be_filtered(sunlight_coverage)

class polar2grid.filters.day_night.NightCoverageFilter(product_filter_criteria: Optional[dict] = None, sza_threshold: float = 100.0, night_fraction: float = 0.1)

Bases: SunlightCoverageFilter

Remove certain products when there is not enough night data.

FILTER_MSG = "Unloading '{}' because there is not enough night data."

_should_be_filtered(sunlight_coverage)

class polar2grid.filters.day_night.SunlightCoverageFilter(product_filter_criteria: Optional[dict] = None, sza_threshold: float = 100.0, fraction: float = 0.1)

Bases: BaseFilter

Base class for filtering based on day/night coverage.

FILTER_MSG = "Unloading '{}' because there is not enough day/night coverage."

_filter_data_array(data_arr: DataArray, _cache: dict)

Check if this DataArray should be removed.

Returns

True if it meets the condition and does not have enough day data and should therefore be removed. False otherwise meaning it should be kept.

_should_be_filtered(sunlight_coverage)

polar2grid.filters.day_night._get_sunlight_coverage(area_def, start_time, sza_threshold=90.0, overpass=None)

Get the sunlight coverage of area_def at start_time as a value between 0 and 1.

polar2grid.filters.day_night.get_twilight_poly(utctime)

Return a polygon enclosing the sunlit part of the globe at utctime.

polar2grid.filters.day_night.modpi(val, mod=3.141592653589793)

Put val between -mod and mod.