Lesson 4 materials + Exercise 4 + computer instance updated

[HTenkanen]

@Automating-GIS-processes/autogis16

Hi all,

and sorry about a bit fuzzy lecture today, sometimes tech won't work as you think. 😛 Here are few notes about today's lesson:

Overlay analysis:

I have updated lesson materials concerning overlay analysis. As the overlay analysis was really slow on our computer instance I added a note how this kind of CPU hungry process can be made much faster by doing the analysis in batches (i.e. running the analysis on a small piece of data at a time). Take a look how the overlay analysis can be run in our computer instance in less than two minutes from here:
https://automating-gis-processes.github.io/2016/Lesson4-geometric-operations.html#performance-tip

Similar approach can be used to enhance the performance of other types of GIS -tasks as well that are heavy on the computers' processor.

Pysal and Common classifiers

There was older version of pysal installed in the computer instance but now it is also updated. Thus, the example in the lesson materials should work now as is shown in the lesson materials:
https://automating-gis-processes.github.io/2016/Lesson4-reclassify.html#classification-based-on-common-classifiers

Exercise 4 instructions updated

There was slightly unlogical step mentioned in the problem 1 on Exercise 4. I have now removed that step (with strikethrough) and updated the Exercise 4 instructions for every one of you.

That's it, good luck with the exercises! We will most likely add some hints for the exercise in the coming days, so take a look at the hints page for those.

Cheers,
Henkka