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I would like to collect pixel level value of country from the featureCollection "USDOS/LSIB_SIMPLE/2017". I use reduceToImage function to reduce featureCollection to ImageCollection and use getRegion to get pixel value of country.

# Get country boundary
country = ee.FeatureCollection("USDOS/LSIB_SIMPLE/2017")
country_img = country.reduceToImage(['abbreviati'], ee.Reducer.first())

# Define geographic domain
world_geometry = ee.Geometry.Polygon([
        -180, 90,
        0, 90, 
        180, 90, 
        180, -90, 
        0, -90,
        -180, -90], None, False) 
#Get pixel values
img_get_region = ee.ImageCollection(country_img).getRegion(world_geometry, scale = 30000).getInfo()
# Convert to dataframe 
img_get_region_df = pd.DataFrame(img_get_region[1:len(img_get_region)], columns = img_get_region[0]).drop(['id', 'time'], axis = 1)

However, I get the error "EEException: Collection.reduceToImage: Property 'abbreviati' not a numeric type." It seems that reduceToImage only accepts numeric features. So how can I collect string feature in this function?

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In Earth Engine, image pixel values can be numbers, or arrays of numbers. They cannot be strings.

You will have to add a numeric ID property of some sort, and convert that to strings after the getRegion().

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  • How can I map from string to number in google earth engine? Presumbly I have a dictionary to map from string to id number of country. Thank you very much for your support.
    – Da Hoang
    Commented Jan 18, 2023 at 16:53
  • @DaHoang Once you have that dictionary you can map over the collection to add a numeric property based on the string property. Here's a previous answer I wrote about how to do that.
    – Kevin Reid
    Commented Jan 18, 2023 at 18:11

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