08 legend and colorbar

Adding a legend¶

Uncomment and execute the following code block to install geemap if needed.

In [1]:

# !pip install geemap

# !pip install geemap

In [2]:

import ee
import geemap

import ee import geemap

Show available built-in legends

In [3]:

legends = geemap.builtin_legends
for legend in legends:
    print(legend)

legends = geemap.builtin_legends for legend in legends: print(legend)

NLCD
ESA_WorldCover
ESRI_LandCover
NWI
MODIS/051/MCD12Q1
MODIS/006/MCD12Q1
GLOBCOVER
JAXA/PALSAR
Oxford
AAFC/ACI
COPERNICUS/CORINE/V20/100m
COPERNICUS/Landcover/100m/Proba-V/Global
USDA/NASS/CDL

Add a built-in legend to the map.

In [4]:

Map = geemap.Map(center=[40, -100], zoom=4)
Map.add_basemap('HYBRID')

nlcd = ee.Image('USGS/NLCD_RELEASES/2019_REL/NLCD/2019')
landcover = nlcd.select('landcover')

Map.addLayer(landcover, {}, 'NLCD Land Cover 2019')
Map.add_legend(legend_title="NLCD Land Cover Classification", builtin_legend='NLCD')
Map

Map = geemap.Map(center=[40, -100], zoom=4) Map.add_basemap('HYBRID') nlcd = ee.Image('USGS/NLCD_RELEASES/2019_REL/NLCD/2019') landcover = nlcd.select('landcover') Map.addLayer(landcover, {}, 'NLCD Land Cover 2019') Map.add_legend(legend_title="NLCD Land Cover Classification", builtin_legend='NLCD') Map

Out[4]:

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Adding a custom legend by defining a legend dictionary with labels as keys and hex color codes as values.

In [5]:

Map = geemap.Map(center=[40, -100], zoom=4)

legend_dict = {
    '11 Open Water': '466b9f',
    '12 Perennial Ice/Snow': 'd1def8',
    '21 Developed, Open Space': 'dec5c5',
    '22 Developed, Low Intensity': 'd99282',
    '23 Developed, Medium Intensity': 'eb0000',
    '24 Developed High Intensity': 'ab0000',
    '31 Barren Land (Rock/Sand/Clay)': 'b3ac9f',
    '41 Deciduous Forest': '68ab5f',
    '42 Evergreen Forest': '1c5f2c',
    '43 Mixed Forest': 'b5c58f',
    '51 Dwarf Scrub': 'af963c',
    '52 Shrub/Scrub': 'ccb879',
    '71 Grassland/Herbaceous': 'dfdfc2',
    '72 Sedge/Herbaceous': 'd1d182',
    '73 Lichens': 'a3cc51',
    '74 Moss': '82ba9e',
    '81 Pasture/Hay': 'dcd939',
    '82 Cultivated Crops': 'ab6c28',
    '90 Woody Wetlands': 'b8d9eb',
    '95 Emergent Herbaceous Wetlands': '6c9fb8',
}

nlcd = ee.Image('USGS/NLCD_RELEASES/2019_REL/NLCD/2019')
landcover = nlcd.select('landcover')

Map.addLayer(landcover, {}, 'NLCD Land Cover 2019')
Map.add_legend(legend_title="NLCD Land Cover Classification", legend_dict=legend_dict)
Map

Map = geemap.Map(center=[40, -100], zoom=4) legend_dict = { '11 Open Water': '466b9f', '12 Perennial Ice/Snow': 'd1def8', '21 Developed, Open Space': 'dec5c5', '22 Developed, Low Intensity': 'd99282', '23 Developed, Medium Intensity': 'eb0000', '24 Developed High Intensity': 'ab0000', '31 Barren Land (Rock/Sand/Clay)': 'b3ac9f', '41 Deciduous Forest': '68ab5f', '42 Evergreen Forest': '1c5f2c', '43 Mixed Forest': 'b5c58f', '51 Dwarf Scrub': 'af963c', '52 Shrub/Scrub': 'ccb879', '71 Grassland/Herbaceous': 'dfdfc2', '72 Sedge/Herbaceous': 'd1d182', '73 Lichens': 'a3cc51', '74 Moss': '82ba9e', '81 Pasture/Hay': 'dcd939', '82 Cultivated Crops': 'ab6c28', '90 Woody Wetlands': 'b8d9eb', '95 Emergent Herbaceous Wetlands': '6c9fb8', } nlcd = ee.Image('USGS/NLCD_RELEASES/2019_REL/NLCD/2019') landcover = nlcd.select('landcover') Map.addLayer(landcover, {}, 'NLCD Land Cover 2019') Map.add_legend(legend_title="NLCD Land Cover Classification", legend_dict=legend_dict) Map

Out[5]:

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Adding a colorbar¶

Add data to the map.

In [6]:

Map = geemap.Map()

dem = ee.Image('USGS/SRTMGL1_003')
vis_params = {
    'min': 0,
    'max': 4000,
    'palette': ['006633', 'E5FFCC', '662A00', 'D8D8D8', 'F5F5F5'],
}

Map.addLayer(dem, vis_params, 'SRTM DEM')

Map

Map = geemap.Map() dem = ee.Image('USGS/SRTMGL1_003') vis_params = { 'min': 0, 'max': 4000, 'palette': ['006633', 'E5FFCC', '662A00', 'D8D8D8', 'F5F5F5'], } Map.addLayer(dem, vis_params, 'SRTM DEM') Map

Out[6]:

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Add a horizontal colorbar to the map.

In [7]:

Map.add_colorbar(vis_params, label="Elevation (m)", layer_name="SRTM DEM")

Map.add_colorbar(vis_params, label="Elevation (m)", layer_name="SRTM DEM")

Add a vertical colorbar the map. Note that the colorbar is tied to the layer name. Note that the previously added colorbar with the same layer name will be replaced with the new colorbar.

In [8]:

Map.add_colorbar(
    vis_params, label="Elevation (m)", layer_name="SRTM DEM", orientation="vertical"
)

Map.add_colorbar( vis_params, label="Elevation (m)", layer_name="SRTM DEM", orientation="vertical" )

Make the colorbar background transparent.

In [9]:

Map.add_colorbar(
    vis_params,
    label="Elevation (m)",
    layer_name="SRTM DEM",
    orientation="vertical",
    transparent_bg=True,
)

Map.add_colorbar( vis_params, label="Elevation (m)", layer_name="SRTM DEM", orientation="vertical", transparent_bg=True, )

Add a discreate colorbar.

In [10]:

Map.add_colorbar(
    vis_params,
    label="Elevation (m)",
    layer_name="SRTM DEM",
    orientation="vertical",
    transparent_bg=True,
    discrete=True,
)
Map

Map.add_colorbar( vis_params, label="Elevation (m)", layer_name="SRTM DEM", orientation="vertical", transparent_bg=True, discrete=True, ) Map

Out[10]:

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Last update: 2022-03-25