Minor additions to Colab notebook

[coolum001]

Hi

First of all, thank you for this notebook.

A few minor notes and gotchas:

When I tried to recreate the notebook in Colab, I found I had to add the cells

!pip install rasterio

and

!export CURL_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt

at the start of the notebook. The second cell is to enable the use of the correct SSL library / certificates to allow AWS access.

When I tried to recreate the notebook on my laptop, I found I needed to install and import the boto3 package (the AWS SDK package), to access the AWS Landsat-8 URLs.. I already had rasterio (I think as part of the Anaconda environment).

# Name                    Version                   Build  Channel
boto3                     1.11.0                     py_0    **defaults**

Cheers
Don Cameron