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update_add_scale_bar #313

Merged
merged 1 commit into from
Feb 21, 2021
Merged

update_add_scale_bar #313

merged 1 commit into from
Feb 21, 2021

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ErikSeras
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Hi,

I would like to contribute with the improvement of the function cartoee.add_scale_bar(). Which allows adding a scale bar with an improved layout. The following image is an example of its use.

image

@giswqs
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giswqs commented Feb 21, 2021

@ErikSeras Thanks a lot for your contribution!

@giswqs giswqs merged commit db1d7a7 into gee-community:master Feb 21, 2021
@ErikSeras ErikSeras deleted the update_add_scale_bar branch February 21, 2021 05:01
@giswqs
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giswqs commented Feb 21, 2021

@ErikSeras Could you provide a working example for the add_scale_bar function? It does not seem to work.

https://gist.github.com/giswqs/96a346ae3cb880dcc08cdea3e923f380

@ErikSeras
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Hi @giswqs. I tried the initial code and I think the last line of the function can throw that error. That line should be removed.
fig.tight_layout()

image

After that, this would be an example code.

import ee
import geemap
from geemap import cartoee
import matplotlib.pyplot as plt
geemap.ee_initialize()
# Get image
lon = -115.1585
lat = 36.1500
start_year = 1984
end_year = 2011

point = ee.Geometry.Point(lon, lat)
years = ee.List.sequence(start_year, end_year)

def get_best_image(year):   

    start_date = ee.Date.fromYMD(year, 1, 1)
    end_date = ee.Date.fromYMD(year, 12, 31)
    image = ee.ImageCollection("LANDSAT/LT05/C01/T1_SR") \
        .filterBounds(point) \
        .filterDate(start_date, end_date) \
        .sort("CLOUD_COVER") \
        .first()    
    return ee.Image(image)

collection = ee.ImageCollection(years.map(get_best_image))


vis_params = {
  "bands": ['B4', 'B3', 'B2'],
  "min": 0,
  "max": 5000
}

image = ee.Image(collection.first())
w = 0.4
h = 0.3

region = [lon-w, lat-h, lon+w, lat+h]

fig = plt.figure(figsize=(10, 8))

# use cartoee to get a map
ax = cartoee.get_map(image, region=region, vis_params=vis_params)

# add gridlines to the map at a specified interval
cartoee.add_gridlines(ax, interval=[0.2, 0.2], linestyle=":")

# add north arrow
north_arrow_dict = {
    "text": "N",
    "xy": (0.25, 0.4),
    "arrow_length": 0.15,
    "text_color": "white",
    "arrow_color": "white",
    "fontsize": 20,
    "width": 5,
    "headwidth": 15,
    "ha": "center",
    "va": "center"
}
cartoee.add_north_arrow(ax, **north_arrow_dict)

# add scale bar
scale_bar_dict = {
    'metric_distance': 4,
    'unit': "km",
    'at_x':(0.1, 0.4),
    'at_y':(0.08, 0.11),
    'max_stripes': 5,
    'ytick_label_margins': 0.25,
    'fontsize': 8,
    'font_weight': "bold",
    'rotation': 45,
    'zorder': 999,
    'paddings': {"xmin": 0.05, "xmax": 0.05, "ymin": 2.2, "ymax": 0.5},
}


cartoee.add_scale_bar(
    ax, 
    **scale_bar_dict
)

ax.set_title(label = 'Las Vegas, NV', fontsize=15)
plt.show()

image

giswqs added a commit that referenced this pull request Feb 21, 2021
@giswqs
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giswqs commented Feb 21, 2021

@ErikSeras Problem solved. Many thanks for your help!

https://geemap.org/notebooks/61_cartoee_scalebar

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2 participants