SpInterpolation/stationdist.Rmd at master · dataandcrowd/SpInterpolation · GitHub

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---
title: "Distance between Seoul Stations"
output: github_document
always_allow_html: yes
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
library(tidyverse)
library(sf)
library(knitr)
library(kableExtra)
```


```{r variables, include=F, echo=FALSE, message=FALSE, warning=FALSE, paged.print=TRUE}
library(sf)
library(shiny)
shp <- st_read("~/Dropbox (Cambridge University)/2019_Cambridge/[Programming]/R/Spatial-Interpolation/seoul/Seoul_City.shp")
st <- st_read("~/Dropbox (Cambridge University)/2019_Cambridge/[Programming]/R/Spatial-Interpolation/seoul/stations_10km.shp")
rd <- st_read("~/Dropbox (Cambridge University)/2019_Cambridge/[Programming]/R/Spatial-Interpolation/seoul/road_10km.shp")
back <- st %>% filter(F.R == "Fixed")
road <- st %>% filter(F.R == "Road")
```

## Stations

```{r table, echo=FALSE, message=FALSE, warning=FALSE, paged.print=TRUE}
stations <- st %>%
            select(-c(X,Y,Station,Road_Dist)) %>%
            st_set_geometry(NULL) %>%
            arrange(F.R)

kable(stations, caption = "Group Rows") %>%
  kable_styling("striped", full_width = F) %>%
  pack_rows("Background Stations", 1, 57) %>%
  pack_rows("Roadside Stations", 58, 76)
```


## Maps

```{r map1, message=FALSE, echo=F, warning=F}
#plot(st_geometry(rd), col = 'grey',key.pos=NULL, reset = F,axes = TRUE, main = "")
#plot(st_geometry(shp), add = T)
#plot(st["F.R"], pch = 19 , add = T)
#mapview::mapview(st["F.R"])

ggplot() +
  geom_sf(data = shp, color = 'black', size = .7, alpha = .5) +
  geom_point(data = st, aes(x = X, y = Y, colour = F.R)) +
  #geom_sf(data = rd, colour = "grey") +
  theme_bw() +
  theme(axis.title.x=element_blank(),
        #axis.text.x=element_blank(),
        axis.ticks.x=element_blank(),
        #axis.text.y=element_blank(),
        axis.title.y=element_blank(),
        strip.text.x = element_text(size = 20),
        legend.title=element_text(size=15),
        legend.text=element_text(size=15),
        legend.position="bottom"
  )
```


## Distance

```{r dist, warning=F}
result.back <- st_distance(back, back, by_element = F)
result.road <- st_distance(road, road, by_element = F)

colnames(result.back) <- back$Name
colnames(result.road) <- road$Name

result.back %>% View()
mean(result.back)
median(result.back)
min(result.back > 0)

mean(result.back[11,])/1000
median(result.back[11,])/1000
head(sort(result.back[11,]), 3)
max(result.back[11,])/1000


```