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Map function over ImageCollection in Python 2.7 in Earth Engine

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1

I am trying to map a function over an image collection in python. I am able to run same process in JavaScript, but in Python I am having issues.

Here is the code in JavaScript, which returns a JSON full of values:

var smap = ee.ImageCollection('NASA_USDA/HSL/SMAP_soil_moisture').filterDate('2019-04-25', '2019-05-17')

var geom = ee.Geometry.Point([-94.440367, 42.1068856])

var res = smap.map(function(image) 
 var reduced = image.reduceRegion(geometry: geom, 
 reducer: ee.Reducer.mean(), 
 crs: 'EPSG:4326', 
 scale: 30)
 return image.set('value', reduced);
);

var vals = res.aggregate_array('value');
print(vals);

However, when I run this in python, I get an empty list:

smap = ee.ImageCollection('NASA_USDA/HSL/SMAP_soil_moisture').filterDate('2019-04-25', '2019-05-17')

geom = ee.Geometry.Point([-94.440367, 42.1068856])

def eeAlgo(image):
 reduced = image.reduceRegion(geometry=geom, reducer=ee.Reducer.mean(), crs='EPSG:4326', scale=30)
 image.set('value', reduced)

 return image

vals = smap.map(algorithm=eeAlgo)

vals.aggregate_array('value').getInfo()

> []

Is there some difference between running this in Python that I am missing? Or is this a bug that I should file at https://github.com/google/earthengine-api? I am using Python 2.7.

google-earth-engine

share|improve this question

edited 8 hours ago

Amadou Kone

asked 8 hours ago

Amadou KoneAmadou Kone

354515

add a comment | 

1

I am trying to map a function over an image collection in python. I am able to run same process in JavaScript, but in Python I am having issues.

Here is the code in JavaScript, which returns a JSON full of values:

var smap = ee.ImageCollection('NASA_USDA/HSL/SMAP_soil_moisture').filterDate('2019-04-25', '2019-05-17')

var geom = ee.Geometry.Point([-94.440367, 42.1068856])

var res = smap.map(function(image) 
 var reduced = image.reduceRegion(geometry: geom, 
 reducer: ee.Reducer.mean(), 
 crs: 'EPSG:4326', 
 scale: 30)
 return image.set('value', reduced);
);

var vals = res.aggregate_array('value');
print(vals);

However, when I run this in python, I get an empty list:

smap = ee.ImageCollection('NASA_USDA/HSL/SMAP_soil_moisture').filterDate('2019-04-25', '2019-05-17')

geom = ee.Geometry.Point([-94.440367, 42.1068856])

def eeAlgo(image):
 reduced = image.reduceRegion(geometry=geom, reducer=ee.Reducer.mean(), crs='EPSG:4326', scale=30)
 image.set('value', reduced)

 return image

vals = smap.map(algorithm=eeAlgo)

vals.aggregate_array('value').getInfo()

> []

Is there some difference between running this in Python that I am missing? Or is this a bug that I should file at https://github.com/google/earthengine-api? I am using Python 2.7.

google-earth-engine

share|improve this question

edited 8 hours ago

Amadou Kone

asked 8 hours ago

Amadou KoneAmadou Kone

354515

add a comment | 

I am trying to map a function over an image collection in python. I am able to run same process in JavaScript, but in Python I am having issues.

Here is the code in JavaScript, which returns a JSON full of values:

var smap = ee.ImageCollection('NASA_USDA/HSL/SMAP_soil_moisture').filterDate('2019-04-25', '2019-05-17')

var geom = ee.Geometry.Point([-94.440367, 42.1068856])

var res = smap.map(function(image) 
 var reduced = image.reduceRegion(geometry: geom, 
 reducer: ee.Reducer.mean(), 
 crs: 'EPSG:4326', 
 scale: 30)
 return image.set('value', reduced);
);

var vals = res.aggregate_array('value');
print(vals);

However, when I run this in python, I get an empty list:

smap = ee.ImageCollection('NASA_USDA/HSL/SMAP_soil_moisture').filterDate('2019-04-25', '2019-05-17')

geom = ee.Geometry.Point([-94.440367, 42.1068856])

def eeAlgo(image):
 reduced = image.reduceRegion(geometry=geom, reducer=ee.Reducer.mean(), crs='EPSG:4326', scale=30)
 image.set('value', reduced)

 return image

vals = smap.map(algorithm=eeAlgo)

vals.aggregate_array('value').getInfo()

> []

Is there some difference between running this in Python that I am missing? Or is this a bug that I should file at https://github.com/google/earthengine-api? I am using Python 2.7.

google-earth-engine

share|improve this question

edited 8 hours ago

Amadou Kone

asked 8 hours ago

Amadou KoneAmadou Kone

354515

var smap = ee.ImageCollection('NASA_USDA/HSL/SMAP_soil_moisture').filterDate('2019-04-25', '2019-05-17')

var geom = ee.Geometry.Point([-94.440367, 42.1068856])

var res = smap.map(function(image) 
 var reduced = image.reduceRegion(geometry: geom, 
 reducer: ee.Reducer.mean(), 
 crs: 'EPSG:4326', 
 scale: 30)
 return image.set('value', reduced);
);

var vals = res.aggregate_array('value');
print(vals);

smap = ee.ImageCollection('NASA_USDA/HSL/SMAP_soil_moisture').filterDate('2019-04-25', '2019-05-17')

geom = ee.Geometry.Point([-94.440367, 42.1068856])

def eeAlgo(image):
 reduced = image.reduceRegion(geometry=geom, reducer=ee.Reducer.mean(), crs='EPSG:4326', scale=30)
 image.set('value', reduced)

 return image

vals = smap.map(algorithm=eeAlgo)

vals.aggregate_array('value').getInfo()

> []

share|improve this question

edited 8 hours ago

Amadou Kone

asked 8 hours ago

Amadou KoneAmadou Kone

354515

share|improve this question

edited 8 hours ago

Amadou Kone

asked 8 hours ago

Amadou KoneAmadou Kone

354515

asked 8 hours ago

Amadou KoneAmadou Kone

354515

asked 8 hours ago

Amadou KoneAmadou Kone

354515

1 Answer
1

active

oldest

votes

2

There is a little difference between you JS code and you python code, and that is where your code "breaks". This is your JS:

var res = smap.map(function(image) 
 var reduced = image.reduceRegion(geometry: geom, 
 reducer: ee.Reducer.mean(), 
 crs: 'EPSG:4326', 
 scale: 30)
 return image.set('value', reduced);
);

but in your python you make an extra line: image.set('value', reduced) and then return image, but image is not an object to which you can set a value, set is a function that return an image, so the code should be:

def eeAlgo(image):
 reduced = image.reduceRegion(geometry=geom, reducer=ee.Reducer.mean(), crs='EPSG:4326', scale=30)
 image = image.set('value', reduced)
 return image

share|improve this answer

answered 7 hours ago

Rodrigo E. PrincipeRodrigo E. Principe

4,78411021

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ah, I see. Thanks for the help!
  
  – Amadou Kone
  7 hours ago
  

  
  
  
  

add a comment | 

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2

There is a little difference between you JS code and you python code, and that is where your code "breaks". This is your JS:

var res = smap.map(function(image) 
 var reduced = image.reduceRegion(geometry: geom, 
 reducer: ee.Reducer.mean(), 
 crs: 'EPSG:4326', 
 scale: 30)
 return image.set('value', reduced);
);

but in your python you make an extra line: image.set('value', reduced) and then return image, but image is not an object to which you can set a value, set is a function that return an image, so the code should be:

def eeAlgo(image):
 reduced = image.reduceRegion(geometry=geom, reducer=ee.Reducer.mean(), crs='EPSG:4326', scale=30)
 image = image.set('value', reduced)
 return image

share|improve this answer

answered 7 hours ago

Rodrigo E. PrincipeRodrigo E. Principe

4,78411021

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ah, I see. Thanks for the help!
  
  – Amadou Kone
  7 hours ago
  

  
  
  
  

add a comment | 

2

There is a little difference between you JS code and you python code, and that is where your code "breaks". This is your JS:

var res = smap.map(function(image) 
 var reduced = image.reduceRegion(geometry: geom, 
 reducer: ee.Reducer.mean(), 
 crs: 'EPSG:4326', 
 scale: 30)
 return image.set('value', reduced);
);

but in your python you make an extra line: image.set('value', reduced) and then return image, but image is not an object to which you can set a value, set is a function that return an image, so the code should be:

def eeAlgo(image):
 reduced = image.reduceRegion(geometry=geom, reducer=ee.Reducer.mean(), crs='EPSG:4326', scale=30)
 image = image.set('value', reduced)
 return image

share|improve this answer

answered 7 hours ago

Rodrigo E. PrincipeRodrigo E. Principe

4,78411021

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ah, I see. Thanks for the help!
  
  – Amadou Kone
  7 hours ago
  

  
  
  
  

add a comment | 

There is a little difference between you JS code and you python code, and that is where your code "breaks". This is your JS:

var res = smap.map(function(image) 
 var reduced = image.reduceRegion(geometry: geom, 
 reducer: ee.Reducer.mean(), 
 crs: 'EPSG:4326', 
 scale: 30)
 return image.set('value', reduced);
);

but in your python you make an extra line: image.set('value', reduced) and then return image, but image is not an object to which you can set a value, set is a function that return an image, so the code should be:

def eeAlgo(image):
 reduced = image.reduceRegion(geometry=geom, reducer=ee.Reducer.mean(), crs='EPSG:4326', scale=30)
 image = image.set('value', reduced)
 return image

share|improve this answer

answered 7 hours ago

Rodrigo E. PrincipeRodrigo E. Principe

4,78411021

var res = smap.map(function(image) 
 var reduced = image.reduceRegion(geometry: geom, 
 reducer: ee.Reducer.mean(), 
 crs: 'EPSG:4326', 
 scale: 30)
 return image.set('value', reduced);
);

def eeAlgo(image):
 reduced = image.reduceRegion(geometry=geom, reducer=ee.Reducer.mean(), crs='EPSG:4326', scale=30)
 image = image.set('value', reduced)
 return image

share|improve this answer

answered 7 hours ago

Rodrigo E. PrincipeRodrigo E. Principe

4,78411021

answered 7 hours ago

Rodrigo E. PrincipeRodrigo E. Principe

4,78411021

answered 7 hours ago

Rodrigo E. PrincipeRodrigo E. Principe

4,78411021