ee_tile_layers module

Tile layers that show EE objects.

EEFoliumTileLayer (TileLayer)

A Folium raster TileLayer that shows an EE object.

Source code in geemap/ee_tile_layers.py

class EEFoliumTileLayer(folium.raster_layers.TileLayer):
    """A Folium raster TileLayer that shows an EE object."""

    def __init__(
        self,
        ee_object,
        vis_params=None,
        name="Layer untitled",
        shown=True,
        opacity=1.0,
        **kwargs,
    ):
        """Initialize the folium tile layer.

        Args:
            ee_object (Collection|Feature|Image|MapId): The object to add to the map.
            vis_params (dict, optional): The visualization parameters. Defaults to None.
            name (str, optional): The name of the layer. Defaults to 'Layer untitled'.
            shown (bool, optional): A flag indicating whether the layer should be on by default. Defaults to True.
            opacity (float, optional): The layer's opacity represented as a number between 0 and 1. Defaults to 1.
        """
        self.url_format = _get_tile_url_format(
            ee_object, _validate_vis_params(vis_params)
        )
        super().__init__(
            tiles=self.url_format,
            attr="Google Earth Engine",
            name=name,
            overlay=True,
            control=True,
            show=shown,
            opacity=opacity,
            max_zoom=24,
            **kwargs,
        )

__init__(self, ee_object, vis_params=None, name='Layer untitled', shown=True, opacity=1.0, **kwargs) special

Initialize the folium tile layer.

Parameters:

Name	Type	Description	Default
ee_object	Collection|Feature|Image|MapId	The object to add to the map.	required
vis_params	dict	The visualization parameters. Defaults to None.	None
name	str	The name of the layer. Defaults to 'Layer untitled'.	'Layer untitled'
shown	bool	A flag indicating whether the layer should be on by default. Defaults to True.	True
opacity	float	The layer's opacity represented as a number between 0 and 1. Defaults to 1.	1.0

Source code in geemap/ee_tile_layers.py

def __init__(
    self,
    ee_object,
    vis_params=None,
    name="Layer untitled",
    shown=True,
    opacity=1.0,
    **kwargs,
):
    """Initialize the folium tile layer.

    Args:
        ee_object (Collection|Feature|Image|MapId): The object to add to the map.
        vis_params (dict, optional): The visualization parameters. Defaults to None.
        name (str, optional): The name of the layer. Defaults to 'Layer untitled'.
        shown (bool, optional): A flag indicating whether the layer should be on by default. Defaults to True.
        opacity (float, optional): The layer's opacity represented as a number between 0 and 1. Defaults to 1.
    """
    self.url_format = _get_tile_url_format(
        ee_object, _validate_vis_params(vis_params)
    )
    super().__init__(
        tiles=self.url_format,
        attr="Google Earth Engine",
        name=name,
        overlay=True,
        control=True,
        show=shown,
        opacity=opacity,
        max_zoom=24,
        **kwargs,
    )

EELeafletTileLayer (TileLayer)

An ipyleaflet TileLayer that shows an EE object.

Source code in geemap/ee_tile_layers.py

class EELeafletTileLayer(ipyleaflet.TileLayer):
    """An ipyleaflet TileLayer that shows an EE object."""

    EE_TYPES = (
        ee.Geometry,
        ee.Feature,
        ee.FeatureCollection,
        ee.Image,
        ee.ImageCollection,
    )

    def __init__(
        self,
        ee_object,
        vis_params=None,
        name="Layer untitled",
        shown=True,
        opacity=1.0,
        **kwargs,
    ):
        """Initialize the ipyleaflet tile layer.

        Args:
            ee_object (Collection|Feature|Image|MapId): The object to add to the map.
            vis_params (dict, optional): The visualization parameters. Defaults to None.
            name (str, optional): The name of the layer. Defaults to 'Layer untitled'.
            shown (bool, optional): A flag indicating whether the layer should be on by default. Defaults to True.
            opacity (float, optional): The layer's opacity represented as a number between 0 and 1. Defaults to 1.
        """
        self._ee_object = ee_object
        self.url_format = _get_tile_url_format(
            ee_object, _validate_vis_params(vis_params)
        )
        super().__init__(
            url=self.url_format,
            attribution="Google Earth Engine",
            name=name,
            opacity=opacity,
            visible=shown,
            max_zoom=24,
            **kwargs,
        )

    @lru_cache()
    def _calculate_vis_stats(self, *, bounds, bands):
        """Calculate stats used for visualization parameters.

        Stats are calculated consistently with the Code Editor visualization parameters,
        and are cached to avoid recomputing for the same bounds and bands.

        Args:
            bounds (ee.Geometry|ee.Feature|ee.FeatureCollection): The bounds to sample.
            bands (tuple): The bands to sample.

        Returns:
            tuple: The minimum, maximum, standard deviation, and mean values across the
                specified bands.
        """
        stat_reducer = (ee.Reducer.minMax()
                        .combine(ee.Reducer.mean().unweighted(), sharedInputs=True)
                        .combine(ee.Reducer.stdDev(), sharedInputs=True))

        stats = self._ee_object.select(bands).reduceRegion(
            reducer=stat_reducer,
            geometry=bounds,
            bestEffort=True,
            maxPixels=10_000,
            crs="SR-ORG:6627",
            scale=1,
        ).getInfo()

        mins, maxs, stds, means = [
            {v for k, v in stats.items() if k.endswith(stat) and v is not None}
            for stat in ('_min', '_max', '_stdDev', '_mean')
        ]
        if any(len(vals) == 0 for vals in (mins, maxs, stds, means)):
            raise ValueError('No unmasked pixels were sampled.')

        min_val = min(mins)
        max_val = max(maxs)
        std_dev = sum(stds) / len(stds)
        mean = sum(means) / len(means)

        return (min_val, max_val, std_dev, mean)

    def calculate_vis_minmax(self, *, bounds, bands=None, percent=None, sigma=None):
        """Calculate the min and max clip values for visualization.

        Args:
            bounds (ee.Geometry|ee.Feature|ee.FeatureCollection): The bounds to sample.
            bands (list, optional): The bands to sample. If None, all bands are used.
            percent (float, optional): The percent to use when stretching.
            sigma (float, optional): The number of standard deviations to use when
                stretching.

        Returns:
            tuple: The minimum and maximum values to clip to.
        """
        bands = self._ee_object.bandNames() if bands is None else tuple(bands)
        try:
            min_val, max_val, std, mean = self._calculate_vis_stats(
                bounds=bounds, bands=bands
            )
        except ValueError:
            return (0, 0)

        if sigma is not None:
            stretch_min = mean - sigma * std
            stretch_max = mean + sigma * std
        elif percent is not None:
            x = (max_val - min_val) * (1 - percent)
            stretch_min = min_val + x
            stretch_max = max_val - x
        else:
            stretch_min = min_val
            stretch_max = max_val

        return (stretch_min, stretch_max)

__init__(self, ee_object, vis_params=None, name='Layer untitled', shown=True, opacity=1.0, **kwargs) special

Initialize the ipyleaflet tile layer.

Parameters:

Name	Type	Description	Default
ee_object	Collection|Feature|Image|MapId	The object to add to the map.	required
vis_params	dict	The visualization parameters. Defaults to None.	None
name	str	The name of the layer. Defaults to 'Layer untitled'.	'Layer untitled'
shown	bool	A flag indicating whether the layer should be on by default. Defaults to True.	True
opacity	float	The layer's opacity represented as a number between 0 and 1. Defaults to 1.	1.0

Source code in geemap/ee_tile_layers.py

def __init__(
    self,
    ee_object,
    vis_params=None,
    name="Layer untitled",
    shown=True,
    opacity=1.0,
    **kwargs,
):
    """Initialize the ipyleaflet tile layer.

    Args:
        ee_object (Collection|Feature|Image|MapId): The object to add to the map.
        vis_params (dict, optional): The visualization parameters. Defaults to None.
        name (str, optional): The name of the layer. Defaults to 'Layer untitled'.
        shown (bool, optional): A flag indicating whether the layer should be on by default. Defaults to True.
        opacity (float, optional): The layer's opacity represented as a number between 0 and 1. Defaults to 1.
    """
    self._ee_object = ee_object
    self.url_format = _get_tile_url_format(
        ee_object, _validate_vis_params(vis_params)
    )
    super().__init__(
        url=self.url_format,
        attribution="Google Earth Engine",
        name=name,
        opacity=opacity,
        visible=shown,
        max_zoom=24,
        **kwargs,
    )

calculate_vis_minmax(self, *, bounds, bands=None, percent=None, sigma=None)

Calculate the min and max clip values for visualization.

Parameters:

Name	Type	Description	Default
bounds	ee.Geometry|ee.Feature|ee.FeatureCollection	The bounds to sample.	required
bands	list	The bands to sample. If None, all bands are used.	None
percent	float	The percent to use when stretching.	None
sigma	float	The number of standard deviations to use when stretching.	None

Returns:

Type	Description
tuple	The minimum and maximum values to clip to.

Source code in geemap/ee_tile_layers.py

def calculate_vis_minmax(self, *, bounds, bands=None, percent=None, sigma=None):
    """Calculate the min and max clip values for visualization.

    Args:
        bounds (ee.Geometry|ee.Feature|ee.FeatureCollection): The bounds to sample.
        bands (list, optional): The bands to sample. If None, all bands are used.
        percent (float, optional): The percent to use when stretching.
        sigma (float, optional): The number of standard deviations to use when
            stretching.

    Returns:
        tuple: The minimum and maximum values to clip to.
    """
    bands = self._ee_object.bandNames() if bands is None else tuple(bands)
    try:
        min_val, max_val, std, mean = self._calculate_vis_stats(
            bounds=bounds, bands=bands
        )
    except ValueError:
        return (0, 0)

    if sigma is not None:
        stretch_min = mean - sigma * std
        stretch_max = mean + sigma * std
    elif percent is not None:
        x = (max_val - min_val) * (1 - percent)
        stretch_min = min_val + x
        stretch_max = max_val - x
    else:
        stretch_min = min_val
        stretch_max = max_val

    return (stretch_min, stretch_max)