commit state boundaries to 1_fetch/in and pass to map_sites function

Author: Lauren Koenig Snyder

1_fetch.R

@@ -9,6 +9,21 @@ source("1_fetch/src/fetch_nhdv2_attributes_from_sb.R")
 
 p1_targets_list <- list(
 
+  # Track and read in the state boundaries sf object. This file was 
+  # created by running `states <- get_state_shp()` followed by 
+  # `saveRDS(states, "1_fetch/in/state_boundaries.rds)`. get_state_shp
+  # is from 3_visualize/src/map_sites.R. It depends on the USAboundaries
+  # package, which is currently archived on CRAN.
+  tar_target(
+    p1_state_boundaries_rds,
+    "1_fetch/in/state_boundaries.rds",
+    format = "file"
+  ),
+  tar_target(
+    p1_state_boundaries_sf,
+    readRDS(p1_state_boundaries_rds)
+  ),
+  
   # download WQP data product from science base for discrete samples
   tar_target(
     p1_wqp_data_file,

1_fetch/in/state_boundaries.rds

@@ -77,6 +77,7 @@ p3_targets_list <- list(
     p3_site_map_png,
     map_sites(flowlines = p1_nhd_reaches_sf,
               matched_sites = p2a_site_splits,
+              states_shp = p1_state_boundaries_sf,
               out_file = "3_visualize/out/do_site_map.png")
   ),
 

3_visualize.R

@@ -9,6 +9,8 @@
 #' @param matched_sites sf object containing site locations and the flowline
 #' reach identifier ("COMID") that the site has been matched to. Must contain
 #' columns "COMID" and "geometry".
+#' @param states_shp sf object containing the U.S. state boundaries to
+#' include in the watershed plot.
 #' @param out_file character string indicating the name of the saved file, 
 #' including file path and extension.
 #' @param huc6_select vector of character string(s) indicating the HUC6 basins that
@@ -37,6 +39,7 @@
 #' 
 map_sites <- function(flowlines, 
                       matched_sites, 
+                      states_shp,
                       out_file,
                       huc6_select = "020402", 
                       basin_bbox = c(xmin = -76.39556, ymin = 39.5, xmax = -74.37121, ymax = 40.89106),
@@ -109,7 +112,7 @@ map_sites <- function(flowlines,
     ggspatial::annotation_scale(bar_cols = c("gray70","white"))
 
   # create inset map
-  inset_map <- map_drb_watershed(matched_sites)
+  inset_map <- map_drb_watershed(matched_sites, states_shp = states_shp)
 
   # grab legend 
   legend <- cowplot::get_legend(sites_map)
@@ -145,10 +148,6 @@ map_sites <- function(flowlines,
 #' @param huc8 vector of character string(s) indicating the HUC8 basins that
 #' make up the watershed of interest. By default, the HUC8 basins that make up
 #' the Delaware River Basin will be used.
-#' @param states vector of character string(s) indicating which states should
-#' be included in the inset map, using two-letter postal code abbreviations for 
-#' each state. By default, the states surrounding the Delaware River Basin will
-#' be downloaded, including "NY", "PA", "NJ", "DE", and "MD".
 #' @param epsg_out integer indicating the coordinate reference system that 
 #' should be used when creating the inset map. Defaults to EPSG 3857, pseudo-
 #' mercator: https://epsg.io/3857
@@ -157,17 +156,14 @@ map_sites <- function(flowlines,
 #' Returns an inset map as a ggplot object.
 #'
 map_drb_watershed <- function(sites,
+                              states_shp,
                               huc8 = c("02040101","02040102","02040103",
                                        "02040104","02040105","02040106",
                                        "02040201","02040202","02040203",
                                        "02040204","02040205","02040206",
                                        "02040207"),
-                              states = c("NY","PA","NJ","DE","MD"),
                               epsg_out = 3857){
 
-  # Download shapefiles for states that encompass the watershed of interest
-  states_shp <- USAboundaries::us_states(resolution = "high", states = states)
-  
   # Download HUC8 boundaries associated with watershed boundary
   boundary <- nhdplusTools::get_huc8(id = huc8) %>%
     sf::st_union()
@@ -191,6 +187,21 @@ map_drb_watershed <- function(sites,
 }
 
 
+#' @title Download state shapefiles
+#' 
+#' @param states vector of character string(s) indicating which states should
+#' be included in the inset map, using two-letter postal code abbreviations for 
+#' each state. By default, the states surrounding the Delaware River Basin will
+#' be downloaded, including "NY", "PA", "NJ", "DE", and "MD".
+#' 
+get_state_shp <- function(states = c("NY","PA","NJ","DE","MD")){
+  
+  # Download shapefiles for states that encompass the watershed of interest
+  states_shp <- USAboundaries::us_states(resolution = "high", states = states)
+  
+}
+
+
 #' @title Create leaflet map of site locations
 
 #' @description 

3_visualize/src/map_sites.R

@@ -3,9 +3,9 @@ library(targets)
 options(tidyverse.quiet = TRUE)
 tar_option_set(packages = c("tidyverse", "lubridate", "rmarkdown", "knitr",
                             "dataRetrieval", "nhdplusTools", "sbtools",
-                            "leaflet", "sf", "USAboundaries", "cowplot",
-                            "ggspatial", "patchwork", "streamMetabolizer", 
-                            "reticulate", "yaml"))
+                            "leaflet", "sf", "cowplot", "ggspatial", 
+                            "patchwork", "streamMetabolizer",  "reticulate",
+                            "yaml"))
 
 source("1_fetch.R")
 source("2_process.R")