::p_load(tidyverse, sf, sfdep, tmap) pacman
In-class_Ex05
1 Install and load packages
2
<- st_read(dsn = "data", layer = "study_area") %>%
studyArea st_transform(3829)
Reading layer `study_area' from data source
`C:\kt-x\is415-GAA\In-class_Ex\In-class_Ex05\data' using driver `ESRI Shapefile'
Simple feature collection with 7 features and 7 fields
Geometry type: POLYGON
Dimension: XY
Bounding box: xmin: 121.4836 ymin: 25.00776 xmax: 121.592 ymax: 25.09288
Geodetic CRS: TWD97
<- st_read(dsn = "data", layer = "stores") %>%
stores st_transform(3829)
Reading layer `stores' from data source
`C:\kt-x\is415-GAA\In-class_Ex\In-class_Ex05\data' using driver `ESRI Shapefile'
Simple feature collection with 1409 features and 4 fields
Geometry type: POINT
Dimension: XY
Bounding box: xmin: 121.4902 ymin: 25.01257 xmax: 121.5874 ymax: 25.08557
Geodetic CRS: TWD97
tmap_mode("view")
tm_shape(studyArea) +
tm_polygons() +
tm_shape(stores) +
tm_dots(col = "Name",
size = 0.01,
border.col = "black",
border.lwd = 0.5) +
tm_view(set.zoom.limits = c(12, 16))
3 Local Colocation Quotients (LCLQ)
<- include_self(
nb st_knn(st_geometry(stores), 6)
)
<- st_kernel_weights(nb,
wt
stores, "gaussian",
adaptive = TRUE)
<- stores %>%
FamilyMart filter(Name == "Family Mart")
<- FamilyMart$Name
A <- stores %>%
SevenEleven filter(Name == "7-Eleven")
<- SevenEleven$Name
B
<- local_colocation(A, B, nb, wt, 49)
LCLQ
<- cbind(stores, LCLQ)
LCLQ_stores #cannot do left-join/right-join cause no unique identifier
tmap_mode("view")