Geospatial Analysis with R

class: center, middle, inverse, title-slide

.title[
# Geospatial Analysis with R
]
.subtitle[
## Class 2
]

---

```r
library(ggmap)
load("external/data/gkey.rda")
m <- get_googlemap(center = c(-71.8229, 42.2511), zoom = 17, maptype = "hybrid",
                   key = gkey)
mp <- ggmap(m, extent = "device")
ggsave(filename = "external/slides/figures/clark.png", plot = mp, 
       bg = "transparent", width = 4, height = 4, units = "in", dpi = 300)
```

---
- Installation progress/trouble-shooting
- `R` packages
- `git` / GitHub
- Tips and tricks for productivity

---
# R packages

- File structure
- Where packages live
- library versus package
- Exported functions, loading packages

---
## Types of packages

<div class="figure" style="text-align: center">
<img src="http://r-pkgs.had.co.nz/diagrams/package-files.png" alt="http://r-pkgs.had.co.nz/package.html" width="70%" />
<p class="caption">http://r-pkgs.had.co.nz/package.html</p>
</div>

---
## Installing packages

<div class="figure" style="text-align: center">
<img src="http://r-pkgs.had.co.nz/diagrams/installation.png" alt="http://r-pkgs.had.co.nz/package.html" width="90%" />
<p class="caption">http://r-pkgs.had.co.nz/package.html</p>
</div>

---

# git / GitHub

- Commits, pushes, pulls
- Branching
- Merging

---
# Tips and Tricks

- Tab completion and shortcuts
- Reusing code
- Code syntax
- [Posting guide](https://www.r-project.org/posting-guide.html)