convert roads & buildings analytic feed results to vector about notebooks

[jreiberkyle]

Roads to vectors notebook in dev branch

[jreiberkyle]

basic roads->vectors code snippet is now available in the roads as vectors notebook

[jreiberkyle]

gdal example and example of roads-> vectors with filtering based on size and simplification are now in the roads as vectors notebook

[jreiberkyle]

Working on extracting road centerlines. I am using the centerlines pip package, which creates MultiLineString features. When I find the centerline in pixel space then try to use shapely to apply an affine transformation to project the features to the image crs, I get this error from shapely:

InvalidInputTypeError: Input geometry must be of type shapely.geometry.Polygon or shapely.geometry.MultiPolygon!

However, the documentation says that affine_transformation can take all geometry types (and searching through the issues suggests that LineString shapes are supported)

Filling in the shapely issue information here, I need to create a script to reproduce:

## Please note

If you are reporting an installation or module import issue, please note that
this project only accepts reports about problems with packages downloaded from
the Python Package Index. Conda users should take issues to one of the
following trackers:

- https://github.com/ContinuumIO/anaconda-issues/issues
- https://github.com/conda-forge/shapely-feedstock

## Expected behavior and actual behavior.



## Steps to reproduce the problem.

(For example, a script with required data)

## Operating system

Mac OS X 10.14.5

## Shapely version and provenance

1.7.1 installed from conda-forge using conda

[jreiberkyle]

Completed with above PRs (dropped centerlines effort)