Various revisions

[stineb]

• [x] Section 2 [GET](https://geco-bern.github.io/handfull_of_pixels/gathering_data.html#get) The query argument could be explained more: are the list elements specific to a certain API? How was the information about available list elements for the example data download (gridded HWSD data) obtained?
• [x] #35
• [x] Avoid single-letter object names - makes it impossible to search (we should spell this out in AGDS I book [here](https://geco-bern.github.io/agds/programmingprimers.html#variable-naming)).
• [x] “list of resources at the end of this book” - cross-reference needed.
• [x] Sec. 4.2 should explain something about the location, specified by lon and lat arguments (Bern?) and clarify that the function call geodata::elevation_3s() downloads a raster data with a certain extent (what extent?).
• [x] Some additional explanations upfront (e.g., Ch. 4.1) would help: “Phenology” is used interchangeably with “leaf-out date”. It should be clarified upfront that the phenology of the leaf-out date is analysed, and that we obtain data from the Greenup.Num_Modes_01 band in the MODIS phenology product MCD12Q2 which contains an estimate of the leaf-out date based on the timing of rapid vegetation greenness increase. Veg greenness is measured by surface reflectance and quantified by the NDVI or EVI index.
• [x] In Chapter 5.1, explain “vegetation (greenness) indices”.
• [x] Chapter 5.1.1. “upcoming chapters where I cover band selection using densely sampled (hyper-spectral) data” - cross-reference?
• [x] upcoming chapters that deal with band selection using densely sampled
• [x] Ch 6.3.1.: Refer to additional information of how simulated annealing works.

[khufkens]

33

[stineb]

These points are not addressed by the PR and can be considered to further improve the course materials.

[stineb]

@khufkens