initial implementation of geoconnex reference features for #386

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: nhdplusTools
 Type: Package
 Title: NHDPlus Tools
-Version: 1.1.0
+Version: 1.2.0
 Authors@R: c(person(given = "David", 
                     family = "Blodgett", 
                     role = c("aut", "cre"), 

NAMESPACE

@@ -5,6 +5,7 @@ export(align_nhdplus_names)
 export(calculate_arbolate_sum)
 export(calculate_total_drainage_area)
 export(disambiguate_flowline_indexes)
+export(discover_geoconnex_reference)
 export(discover_nhdplus_id)
 export(discover_nldi_characteristics)
 export(download_nhd)
@@ -25,6 +26,7 @@ export(get_characteristics_metadata)
 export(get_elev_along_path)
 export(get_flowline_index)
 export(get_gagesII)
+export(get_geoconnex_reference)
 export(get_hr_data)
 export(get_huc)
 export(get_hydro_location)

NEWS.md

@@ -1,3 +1,12 @@
+nhdplusTools 1.2.0
+==========
+
+This release introduces a new data source: https://reference.geoconnex.us and a vignette providing a broad overview of data access with nhdplusTools.
+
+- Fixed bug with use of memoise cache #365
+- Added `vignette("get_data_overview")` for WaterSciCon24
+- Added `get_geoconnex_reference()` and `discover_geoconnex_reference()`
+
 nhdplusTools 1.1.0
 ==========
 

R/get_geoconnex.R

@@ -0,0 +1,207 @@
+#' memoise get json
+#' @description
+#' attempts to get a url as JSON and return the content.
+#'
+#' Will return NULL if anything fails
+#'
+#' @param url character url to get
+#' @return list containing parsed json on success, NULL otherwise
+#' @noRd
+mem_get_json <- landing <- memoise::memoise(\(url) {
+  tryCatch({
+    retn <- httr::RETRY("GET", url, httr::accept_json())
+
+    if(retn$status_code == 200 & grepl("json", retn$headers$`content-type`)) {
+      return(httr::content(retn, simplifyVector = FALSE, type = "application/json"))
+    } else {
+      warning("Can't access json from ", url)
+      return(NULL)
+    }
+  }, error = function(e) {
+    warning("Error accessing ", url, "\n\n", e)
+    return(NULL)
+  })
+})
+
+filter_list_kvp <- \(l, key, val, type = NULL, n = NULL) {
+  ret <- l[vapply(l, \(x) x[[key]] == val, TRUE)]
+
+
+  if(!is.null(type)) {
+    ret <- ret[vapply(ret, \(x) x[["type"]] == type, TRUE)]
+  }
+
+  if(!is.null(n)) {
+    ret <- ret[[n]]
+  }
+
+  ret
+}
+
+extract <- `[[`
+
+#' discover geoconnex reference feature layers
+#' @description
+#' Queries the geoconnex.us reference feature server for available layers and
+#' attributes.
+#'
+#' @return data.frame containing layers available and fields that are available to query.
+#' @export
+#' @examples
+#' discover_geoconnex_reference()
+#'
+discover_geoconnex_reference <- function() {
+
+  landing <- mem_get_json(get("gocnx_ref_base_url", envir = nhdplusTools_env))
+
+  collections <- landing$links |>
+    filter_list_kvp("rel", "data", n = 1) |>
+    extract("href") |>
+    mem_get_json()
+
+  collections_meta <- dplyr::bind_rows(
+    lapply(collections$collections,
+           \(x) c(x[c("id", "title", "description")],
+                  list(url = filter_list_kvp(x$links,
+                                             "rel", "self", n = 1)$href))))
+
+
+  q_ables <- dplyr::bind_rows(lapply(collections$collections, \(x) {
+    q <- filter_list_kvp(x$links, "rel", "http://www.opengis.net/def/rel/ogc/1.0/queryables",
+                         type = "application/schema+json", n = 1)$href |>
+      mem_get_json() |>
+      (\(y) list(id = x$id, qs = y$properties))()
+
+    q$qs <- q$qs[vapply(q$qs, \(x) all(c("title", "type") %in% names(x)), TRUE)]
+
+    data.frame(id = rep(q$id, length(q$qs)),
+               attribute = vapply(q$qs, \(x) x$title, ""),
+               type = vapply(q$qs, \(x) x$type, ""), row.names = NULL)
+  }))
+
+  dplyr::left_join(collections_meta, q_ables, by = "id")
+}
+
+get_features_paging <- function(base_call, limit = 1000, status = TRUE) {
+
+  if(!grepl("\\?", base_call)) {
+    base_call <- paste0(base_call, "?")
+  } else {
+    base_call <- paste0(base_call, "&")
+  }
+
+  offset <- 0
+
+  keep_going <- TRUE
+
+  if(status) message("Starting download of first set of features.")
+
+  out <- rep(list(list()), 1e6)
+  i <- 1
+
+  while(keep_going) {
+    req <- paste0(base_call, "limit=", limit, "&offset=", offset)
+
+    out[[i]] <- try(read_sf(req))
+
+    if(inherits(out[[i]], "sf") & nrow(out[[i]]) == limit) {
+      offset <- offset + limit
+    }
+
+    if(nrow(out[[i]]) < limit) keep_going <- FALSE
+
+    if(!inherits(out[[i]], "sf")) {
+      warning("Something went wrong requesting data.")
+      keep_going <- FALSE
+    }
+
+    if(status & keep_going) message("Starting next download from ", offset, ".")
+
+    i <- i + 1
+  }
+
+  out <- out[1:(i - 1)]
+
+  sf::st_sf(dplyr::bind_rows(unify_types(out)))
+}
+
+#' get geoconnex reference feature layers
+#' @description
+#' Queries the geoconnex reference feature server for features of interest.
+#'
+#' @param AOI  bbox, sf polygon or point, or a URL that will return an sf object when passed to
+#' \link[sf]{read_sf}
+#' @param type character the feature type chosen from \link{discover_geoconnex_reference}
+#' @inheritParams query_usgs_geoserver
+#' @param status boolean print status or not
+#' @return sf data.frame containing requested reference features
+#' @export
+#' @examples
+#' \donttest{
+#'
+#' dplyr::distinct(discover_geoconnex_reference()[c("id", "title")])
+#'
+#' AOI <- sf::st_as_sfc(sf::st_bbox(c(xmin = -89.56684, ymin = 42.99816,
+#'                                    xmax = -89.24681, ymax = 43.17192),
+#'                                  crs = "+proj=longlat +datum=WGS84 +no_defs"))
+#'
+#' get_geoconnex_reference(AOI, type = "hu04")
+#'
+#' get_geoconnex_reference("https://geoconnex.us/ref/mainstems/315626", type = "hu04", )
+#'
+#' AOI <- sf::st_sfc(sf::st_point(c(-89.56684, 42.99816)),
+#'                   crs = "+proj=longlat +datum=WGS84 +no_defs")
+#'
+#' get_geoconnex_reference(AOI, type = "hu04", buffer = 100000)
+#'
+#' }
+get_geoconnex_reference <- function(AOI,
+                                    type = NULL,
+                                    t_srs = NULL,
+                                    buffer = 0.5,
+                                    status = TRUE) {
+
+  avail <- discover_geoconnex_reference()
+
+  if(is.null(type)) {
+    warning("type is required, returning choices.")
+    return(avail)
+  }
+
+  base <- get("gocnx_ref_base_url", envir = nhdplusTools_env)
+
+  if(!type %in% avail$id) stop("Type must be in available ids. ",
+                               "Check discover_geoconnex_reference()")
+
+  base_call <- paste0(base, "collections/", type, "/items")
+
+  if(is.character(AOI)) {
+
+    AOI <- try(sf::read_sf(AOI))
+
+    if(!inherits(AOI, "sf")) {
+      stop("AOI did not return an sf object when read")
+    }
+
+  }
+
+  if(!inherits(AOI, "bbox")) {
+    AOI <- st_bbox(AOI)
+  } else if(!inherits(AOI, "bbox") &&
+            grepl("point", sf::st_geometry_type(AOI), ignore.case = TRUE)) {
+    AOI <- sf::st_buffer(AOI, units::as_units(buffer, "m"))
+  }
+
+  # pull features with paging if necessary
+
+  bbox <- paste(AOI, collapse = ",")
+
+  base_call <- paste0(base_call, "?bbox=", bbox)
+
+  out <- get_features_paging(base_call, status = status)
+
+  if(!is.null(t_srs)) out <- st_transform(out, t_srs)
+
+  out
+}
+

R/get_network.R

@@ -219,7 +219,7 @@ navigate_network <- function(start, mode = "UM", network = NULL,
       stop("If start is numeric it must be a comid integer")
     }
 
-    start <- as.integer(start)
+    start <- floor(start)
     start_comid <- start
 
   }
@@ -332,7 +332,7 @@ navigate_network <- function(start, mode = "UM", network = NULL,
   # now trim start if requested
   if(trim_start) {
 
-    if(!is.integer(start)) {
+    if(!(is.numeric(start) && start %% 1 == 0)) {
       if(output == "flowlines") {
         # trim event flowline to measure of event
 

_pkgdown.yml

@@ -5,12 +5,14 @@ reference:
     desc: >
       Functions that help get access data. (all U.S. context)
   - contents:
-      - '`download_nhdplushr`'
       - '`get_3dhp`'
-      - '`get_nhdplus`'
+      - '`discover_geoconnex_reference`'
+      - '`get_geoconnex_reference`'
+      - '`download_nhdplushr`'
       - '`get_nhdplushr`'
       - '`get_hr_data`'
       - '`download_nhdplusv2`'
+      - '`get_nhdplus`'
       - '`download_nhd`'
       - '`download_rf1`'
       - '`download_wbd`'
@@ -35,7 +37,6 @@ reference:
       - '`subset_rpu`'
       - '`subset_vpu`'
       - '`discover_nhdplus_id`'
-      - '`get_nhdplus`'
       - '`get_gagesII`'
       - '`get_huc`'
       - '`get_nhdarea`'