Error while calculating mean

[Rohit Jain]

Hi,

can anyone help me with the below code I am some wearied output..don' know what exactly to do...

Also, can someone tell me that how to load an image collection like ImageCollection('?(asking about this)') and from the image collection how to know which image is where with name.

I am working on linux and using python.

import ee

ee.Initialize()

"""landsat5Toa = ee.ImageCollection('LC80150062013111LGN01').filterDate('2014-3-25').select('B[1]')"""

img = ee.Image('LC80150062013111LGN01').select('B1').unitScale(0, 255)

meanReducer = ee.Reducer.mean()

sigmaReducer = ee.Reducer.stdDev()

region = ee.Geometry.Rectangle(77.00133,-51.30404,74.69582,-41.38993 )

scale = 10000

mean = img.reduceRegion(meanReducer, region, scale)

sigma = img.reduceRegion(sigmaReducer, region, scale)

"""mean = landsat5Toa.get('bands')"""

 

def stretch(img, mean, sigma):

  return ee.Image(0).expression(

  '((img - mean) / (sigma * 3)) + 0.5',  {

  'img': img, 

  'mean': ee.Image.constant(mean),

  'sigma': ee.Image.constant(sigma)

  })

print(mean.getInfo())

print(sigma.getInfo())

Output

{u'B1': None}

{u'B1': None}

I dont know where I am haveing a problem.

Thank You 

[Patrice (Cloud Platform Support)]

Hi Rohit,

While this is a very interesting question, it would probably belong better on Stack Overflow, since it's a question requiring 1-1 support. We do monitor Stack Overflow for good questions in the tags related to the Google Cloud Platform, so you can either get an answer by a member of support or from the community itself.

I would suggest separating your two questions into two separate posts. Remember to include enough code to your question about mean to have a Minimal example to reproduce your issue, as it will tremendously help other users in helping you out.

Cheers!