Part 3 working with raster data

[cforgaci]

I migrated the content of the third part to the workbench format.

Things left to do:

• Add lessons to workbench template
• Revise lesson content based on feedback from the last workshop
• Adjust time needed to teach and for challenges according to changes in content

Main changes made in the lesson:

• Replaced raster package with terra. This way we only use one consistent package that integrates the functionality of raster and rgdal used in the previous version of the workshop.

Please ignore the vector episodes and only review the raster episodes in this PR. Vector episodes are in the separate PR #1.

To review this PR locally, follow these steps:

1. If you have a clone of this repository on your computer in an RStudio project, skip this step. Otherwise, clone it to your computer in RStudio via New Project... > Version Control, using the url https://github.com/carpentries-incubator/r-geospatial-urban.git.
2. If you've already installed the packages below in RStudio, skip this step. Otherwise, run the following code in your console to install them:

install.packages(c("sandpaper", "varnish", "pegboard", "tinkr"),
  repos = c("https://carpentries.r-universe.dev/", getOption("repos")))

3. In your RStudio project, open the terminal and run git fetch origin pull/3/head:claudiu-raster. This will create a new local branch with the name claudiu-raster that contains the code from Part 3 working with raster data #3.
4. Still in the terminal/command line, run git switch claudiu-raster to move to the newly created branch. Make sure your project is read-only, that is, you do not make changes to any of the files in your project; otherwise, git will not allow you to move to another branch.
5. In RStudio build the workshop website with Ctrl + Shift + B (Windows) or Command + Shift + B (Mac)
6. To review, read and run the code in the Rmd files found in the episodes\ folder and examine the output in the rendered website. Please use this local copy as read-only and do not push changes from it. Instead, comment and suggest changes via the GitHub reviewing interface.

[github-actions]

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[manuGil]

Please consider my comments to improve this lessons.

[ClementineCttn]

Hello. This lesson is still quite long and a bit abstract. I think it might help to skip a few operations and instead give some context on why we might want to subtract raster or what to do with the result (in the context of urban and social research and practice)

[dcannatella]

Review of Episode 13

[dcannatella]

review episode 15 done

[dcannatella]

episode 15 reviewed

[dcannatella]

episode 17 reviewed

[cforgaci]

Hi, @ClementineCttn. Thanks for the comments.

Hello. This lesson is still quite long and a bit abstract. I think it might help to skip a few operations

• Drop a few operations to shorten raster lesson

I shortened the lesson as followed:

• removed the hillshade part entirely
• removed one challenge
• simplified a couple of challenges
• removed the mention and figure of CHM in episode 15

[cforgaci]

Thanks all for the input. This lesson is ready to be merged into main.

[manuGil]

I made a figure illustrating the digital height canopy model. I thinks this illustrates it in a slightly better way. What do you think? How can I improve on it?

[cforgaci]

Hello. This lesson is still quite long and a bit abstract. I think it might help to skip a few operations and instead give some context on why we might want to subtract raster or what to do with the result (in the context of urban and social research and practice)

Thanks @manuGil for taking the time to improve this image! It is clearer, but the issue is that the terrain is still kept in the CHM. The subtraction should lead to a 'flat' ground so that only the height of trees and buildings is visible.

Let's keep the original illustration for now. I will open an issue in the main repo for us to remember to update the figure after our upcoming workshop.