tmap | fast visualization library | Data Visualization library

Concerning my last post, I successfully plotted the school districts on a national map using the library tmap. Below is my attempt to plot the map. As you can see, this is far behind the reference (by Laura Bliss: Bloomberg CityLab, 2015) that I want to follow. I guess there might be something wrong when I used st_make_valid(). Thus, I ran the following code to see the reasons behind Error: Shape contains invalid polygons (please note that I used Alabama (al) as an example, and the responses from st_is_valid(..., reason = TRUE) are 140 lines in total).

I want to type a function that can take either a class type, or an instance of the class, and then return an instance of that same class. For example:

Lidar data is simply 3d coordinates, usually in las file format. Сontent example

I am working with some public datasets, which can be accessed here inside the 'stack_question' folder).

I am trying to create a map of all the supermarkets within the state of Kansas using the tmap library in R. Using ggplot, I generated a map using the following code:

I am trying to specify a simple legend for a map of polygons and an integer variable, in which not all values within the range are present. I need this in order to have the same legend, with the same color scale, on comparable maps which differ in both the range and the particular values present. For example, the maximum value of a variable is 8 on any of the maps. I want the legend to show the values 0 to 8 even when 6, or any particular value, is not present for any polygon, and I want the labels on the legend to be 0 to 8, inclusive, with no pooling.

A replicable example:

I am using the tmap package to plot some data on a map. Because of the size of the datasets, you can download the needed ones here (they are public datasets). This code uses the .csv and .shp files in the drive.

I need to move the compass and the scale bar off of the image and below my legends. How can I do this? I haven't seen that the tm_compass command has an option to move it outside of the image, so is there another way of doing this?

Code:

I have taken aerial photographs with a drone and stitched those together into a .geotiff file, using third party software. I would like to add this file as a layer to an interactive leaflet map, e.g. as produced by mapview. I can produce an interactive map, but this only shows data, e.g. digital elevation not the actual photograph.

.geotiff files aren't very freely available, so see this link for an example file from naturalearth: https://www.naturalearthdata.com/downloads/50m-raster-data/50m-cross-blend-hypso/

Is it possible to include more than one tm_compass() on a map created by tmap?

I know it's probably unlikely that you'd need to, but say you wanted to show off the different compass types. Using nz from the spData package I tried adding each new compass as an additional layer, but it seems only the first one is included on the map.

I am trying to use the exact_extract() function of the exactextractr:: package to give me the percent area of a polygon covered by each class of a classified raster. However, I am getting a cryptic error message "Error in .num_expected_args(fun) : 'list' object cannot be coerced to type 'double'." The error seems to be saying that all of the coverage fraction values are stored in a list, and the summarization routine is trying to convert it to a double-precision datatype. The only thing I can think of is that perhaps this is a bug in the exact_extract() function. Any guidance would be much appreciated. Below is my reproducible example to illustrate the issue: