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Copy file name to clipboardExpand all lines: instructors/instructor-notes.md
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at the end of the first day, they will need to either save the workspace or reload the data and packages.
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Because of this, it is essential that learners save their code to a script throughout the lesson.
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#### [Intro to Raster Data in R](01-raster-structure.md)
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#### [1 Intro to Raster Data in R](01-raster-structure.md)
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- Be sure to introduce the datasets that will be used in this lesson. There are many data files. It may
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be helpful to draw a diagram on the board showing the types of data that will be plotted and analyzed
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- Be sure to draw a distinction between the DTM and the DSM files, as these two datasets will be used
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throughout the lesson.
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#### [Plot Raster Data in R](02-raster-plot.md)
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#### [2 Plot Raster Data in R](02-raster-plot.md)
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-`geom_bar()` is a new geom for the learners. They were introduced to `geom_col()` in the [Introduction to R for Geospatial Data](https://datacarpentry.org/r-intro-geospatial/) lesson.
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-`dplyr` syntax should be familiar to your learners from the [Introduction to R for Geospatial Data](https://datacarpentry.org/r-intro-geospatial/) lesson.
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- This may be the first time learners are exposed to hex colors, so be sure to explain that concept.
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- Starting in this episode and continuing throughout the lesson, the `ggplot` calls can be very long. Be sure
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to explicitly describe each step of the function call and what it is doing for the overall plot.
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#### [Reproject Raster Data in R](03-raster-reproject-in-r.md)
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#### [3 Reproject Raster Data in R](03-raster-reproject-in-r.md)
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- No notes yet. Please add your tips and comments!
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#### [Raster Calculations in R](04-raster-calculations-in-r.md)
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#### [4 Raster Calculations in R](04-raster-calculations-in-r.md)
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- The `overlay()` function syntax is fairly complex compared to other function calls the learners have seen.
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Be sure to explain it in detail.
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#### [Work With Multi-Band Rasters in R](05-raster-multi-band-in-r.md)
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#### [5 Work With Multi-Band Rasters in R](05-raster-multi-band-in-r.md)
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- No notes yet. Please add your tips and comments!
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#### [Open and Plot Shapefiles in R](06-vector-open-shapefile-in-r.md)
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#### [6 Open and Plot Shapefiles in R](06-vector-open-shapefile-in-r.md)
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- Learners may have heard of the `sp` package. If it comes up, explain that `sf` is a
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more modern update of `sp`.
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- There is a known bug in the `geom_sf()` function that leads to an intermittent error on some platforms.
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If you see the following error message, try to re-run your plotting command and it should work.
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The `ggplot` development team is working on fixing this bug.
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##Error message
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* Error message *
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```error
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Error in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y, :
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polygon edge not found
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```
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#### [Explore and Plot by Shapefile Attributes](07-vector-shapefile-attributes-in-r.md)
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#### [7 Explore and Plot by Shapefile Attributes](07-vector-shapefile-attributes-in-r.md)
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- No notes yet. Please add your tips and comments!
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#### [Plot Multiple Shapefiles in R](08-vector-plot-shapefiles-custom-legend.md)
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