[英]Python GEE to extract featurecollection timeseries from Landsat imageries
[英]How to convert from Javascript to Python API for FeatureCollection in GEE?
我有一個運行良好的 JS 代碼:
dataset = ee.Image('USGS/SRTMGL1_003');
elevation = dataset.select('elevation');
var means_of_tea = tea.map(function(field){
var elevation_mean = elevation.reduceRegion({
reducer: ee.Reducer.mean(),
geometry: field.geometry(),
scale: 30,
maxPixels: 1e9
});
var slope_mean = slope.reduceRegion({
reducer: ee.Reducer.mean(),
geometry: field.geometry(),
scale: 30,
maxPixels: 1e9
});
return field.set({elevation:elevation_mean, slope:slope_mean});
我試圖將代碼轉換為python:
def map_fc(field):
elevation_mean = elevation.reduceRegion({
'reducer': ee.Reducer.mean(),
'geometry': field.geometry(),
'scale': 30,
'maxPixels': 1e9
})
return field.set({'elevation': elevation_mean})
teawithmean = tea.map(map_fc)
但給出了錯誤:
<ipython-input-36-e999072d4723> in <module>()
9 })
10 return field.set({'elevation': elevation_mean})
---> 11 teawithmean = tea.map(inmap)
17 frames
/usr/local/lib/python3.6/dist-packages/ee/__init__.py in init(self, *args)
397 raise EEException(
398 'Invalid argument for ee.{0}(): {1}. '
--> 399 'Must be a ComputedObject.'.format(name, args))
400 else:
401 result = args[0]
EEException: Invalid argument for ee.Reducer(): ({'reducer': <ee.Reducer object at 0x7f3b4699e4a8>, 'geometry': ee.Geometry({
"functionInvocationValue": {
"functionName": "Feature.geometry",
"arguments": {
"feature": {
"argumentReference": null
}
}
}
}), 'scale': 30, 'maxPixels': 1000000000.0},). Must be a ComputedObject.
我已經閱讀了將表單 JS 轉換為 python 的谷歌指南,但不知道為什么會發生這種情況。 錯誤是由於錯誤的語法嗎?
在 Python EE API 中,使用 Python 命名參數語法而不是字典作為參數。
elevation_mean = elevation.reduceRegion(
reducer=ee.Reducer.mean(),
geometry=field.geometry(),
scale=30,
maxPixels=1e9
)
請注意,屬性名稱不是命名參數,因此set()
工作方式與 JavaScript 中的相同; 您可以使用或不使用字典,但不要使用=
。
return field.set({'elevation': elevation_mean})
# or
return field.set('elevation', elevation_mean)
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