class: center, middle, inverse, title-slide

# Spatial data & visualization

---

## 1854 London Cholera Outbreak

<img src="img/06/cholera.png" width="75%" style="display: block; margin: auto;" />

---

## Napoleon's 1812 Russia Campaign

<img src="img/06/napoleon.png" width="100%" style="display: block; margin: auto;" />

--

**Many others!**

- [World Population Density](https://luminocity3d.org/WorldPopDen/#3/12.00/10.00)
- [Global Power](https://www.gocompare.com/gas-and-electricity/what-powers-the-world/)

---

## Raster versus vector spatial data

.vocab[Vector] spatial data describes the world using shapes (points, lines, 
polygons, etc).

.vocab[Raster] spatial data describes the world using cells of constant size.

<img src="img/06/vector_raster_comparison.png" width="40%" style="display: block; margin: auto;" />

The choice to use vector or raster data depends on the problem context. We will 
focus on vector data.

*Source:* https://commons.wikimedia.org/wiki/File:Raster_vector_tikz.png

---

Click the link below to create the repository for lecture notes #06
  -https://classroom.github.com/a/SwGmBhHJ
  
Follow the steps to clone the repo, make a new RStudio project, and configure
git. Change the author name in the YAML header of `lecture06.Rmd` to your name
and update the date to today's date.

<br>

Complete the Lab Team Formation Survey by 2-09 11:59 PM. Do this now if you 
have time.
 - [https://forms.gle/mZMZ53Zfy3yPHwdJ6](https://forms.gle/mZMZ53Zfy3yPHwdJ6)

---

Simple features have a geometry type. Common choices are below.

<img src="06-spatial_files/figure-html/unnamed-chunk-6-1.png" width="90%" style="display: block; margin: auto;" />

---

## Spatial data plotting needs care

<img src="06-spatial_files/figure-html/unnamed-chunk-7-1.png" width="75%" style="display: block; margin: auto;" />

---

## Map Layers

The North Carolina Department of Environment and Natural Resources, 
Wildlife Resources Commission and the NC Center for Geographic Information and 
Analysis has a [shapefile data set](https://www.nconemap.gov/datasets/e5ddff9b96204c6181be7c022e61d946_0) 
available on all public Game Lands in NC.

```r
nc_game <- st_read("data/gamelands.shp", quiet = TRUE)
```

---

```r
ggplot(nc_game) +
  geom_sf() +
  theme_bw() +
  labs(title = "North Carolina gamelands")
```

<img src="06-spatial_files/figure-html/unnamed-chunk-9-1.png" style="display: block; margin: auto;" />

---

```r
ggplot(nc_game) +
  geom_sf(fill = "#ff6700") +
  theme_bw() +
  labs(title = "North Carolina gamelands")
```

<img src="06-spatial_files/figure-html/unnamed-chunk-10-1.png" style="display: block; margin: auto;" />

---

```r
ggplot(nc) +
  geom_sf() +
  geom_sf(data = nc_game, fill = "#ff6700", alpha = .5) +
  theme_bw() +
  labs(title = "North Carolina gamelands and counties")
```

<img src="06-spatial_files/figure-html/unnamed-chunk-11-1.png" style="display: block; margin: auto;" />

---

.tiny[

```r
ggplot(nc) +
  geom_sf() +
  geom_sf(data = nc_game, aes(alpha = SUM_ACRES), fill = "#ff6700") +
  theme_bw() +
  labs(title = "North Carolina gamelands and counties", fill = "Acres")
```

<img src="06-spatial_files/figure-html/unnamed-chunk-12-1.png" style="display: block; margin: auto;" />
]

Notes for current slide

Notes for next slide

Spatial data & visualization

1 / 12

1854 London Cholera Outbreak

2 / 12

Napoleon's 1812 Russia Campaign

3 / 12

Napoleon's 1812 Russia Campaign

Many others!

3 / 12

Raster versus vector spatial data

Vector spatial data describes the world using shapes (points, lines, polygons, etc).

Raster spatial data describes the world using cells of constant size.

The choice to use vector or raster data depends on the problem context. We will focus on vector data.

Source: https://commons.wikimedia.org/wiki/File:Raster_vector_tikz.png

4 / 12

Click the link below to create the repository for lecture notes #06 -https://classroom.github.com/a/SwGmBhHJ

Follow the steps to clone the repo, make a new RStudio project, and configure git. Change the author name in the YAML header of lecture06.Rmd to your name and update the date to today's date.

Complete the Lab Team Formation Survey by 2-09 11:59 PM. Do this now if you have time.

https://forms.gle/mZMZ53Zfy3yPHwdJ6

5 / 12

Simple features have a geometry type. Common choices are below.

6 / 12

Spatial data plotting needs care

7 / 12

Map Layers

The North Carolina Department of Environment and Natural Resources, Wildlife Resources Commission and the NC Center for Geographic Information and Analysis has a shapefile data set available on all public Game Lands in NC.

nc_game <- st_read("data/gamelands.shp", quiet = TRUE)

8 / 12

ggplot(nc_game) +
  geom_sf() +
  theme_bw() +
  labs(title = "North Carolina gamelands")

9 / 12

ggplot(nc_game) +
  geom_sf(fill = "#ff6700") +
  theme_bw() +
  labs(title = "North Carolina gamelands")

10 / 12

ggplot(nc) +
  geom_sf() +
  geom_sf(data = nc_game, fill = "#ff6700", alpha = .5) +
  theme_bw() +
  labs(title = "North Carolina gamelands and counties")

11 / 12

ggplot(nc) +
  geom_sf() +
  geom_sf(data = nc_game, aes(alpha = SUM_ACRES), fill = "#ff6700") +
  theme_bw() +
  labs(title = "North Carolina gamelands and counties", fill = "Acres")

12 / 12

1854 London Cholera Outbreak

2 / 12

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