Instructor notes
Lesson motivation and learning objectives
This lesson is designed to introduce learners to the core concepts of geospatial raster and vector data that they will need in order to complete the other lessons in this workshop. It is primarily intended for learners who have not worked with geospatial data before (but plan to do so in the future), but it is also useful for learners who have worked with geospatial data in GUI-based systems like ArcGIS. Those systems often hide details of file formats and metadata types that are essential to know about when working with geospatial data through CUI interfaces like R.
Lesson design
Introduction to Raster Data
- This episode includes graphics generated from data that will be used later in the workshop. Show these images from the lesson page as you work through the episode. Tell learners that by the end of the workshop, they will be able to write the code that generates these images.
- Learners may be familiar with other file formats than GeoTIFF for storing raster data. Emphasize that there are many different file formats used with geospatial data but that for this workshop we are going to be working with GeoTIFF files.
Introduction to Vector Data
- Like with the previous episode, note that there are many different file formats for storing vector data but that we will be working with the Shapefile format in this workshop.
Coordinate Reference Systems
- Try not to get off track with jargon debates (CRS vs SRS, projection vs CRS).
- Emphasize that the choice of projection depends on the size and location of the study site or data collection region.
- For describing CRSs, there are many different systems. We are choosing to limit the discussion in this workshop to PROJ4. Learners may encounter other systems in their work.
- Don’t get into the “Other Common Systems” callout box unless learners specifcally request information about other systems or mention others that they are working with.
The Geospatial Landscape
- This lesson discusses many different software packages. Don’t read all of the text to the learners. Instead, provide a summary (commercial vs. open source vs. cloud systems).
- Mention specific systems that learners have worked with or are planning on working with (especially if they mention specific systems in their pre-workshop survey responses).
Concluding points
- The rest of the lessons in this workshop go into a lot more depth about each of the topics presented here.
- We will be using R for the rest of the workshop.
Technical tips and tricks
Not applicable. No software used in this lesson.
Common problems
TBA - Instructors please add situations you encounter here.