3DEP tiles for CONUS

Determine which 1 degree square USGS tiles we need to download for our CONUS modeling area. A download list for 1 arc-second (~30m) resolution TIFs is generated at the end.

library(sf)
library(mapview)
library(stringr)

CONUS Polygon

# https://catalog.data.gov/dataset/tiger-line-shapefile-2017-nation-u-s-current-state-and-equivalent-national
# https://www2.census.gov/geo/tiger/TIGER2017//STATE/tl_2017_us_state.zip
states = st_read("/data-belle/census/states/tl_2017_us_state.shp", quiet = TRUE)
states = states[!states$STUSPS %in% c("PR", "HI", "AK", "GU", "VI", "AS", "MP"), ]
states = states[, "REGION"]

Union and 2km Buffer

modis_crs = "+proj=sinu +lon_0=0 +x_0=0 +y_0=0 +a=6371007.181 +b=6371007.181 +units=m +no_defs"
conus_union = st_union(states)
conus_union_modis = st_transform(conus_union, crs = modis_crs)
conus_buff_modis = st_buffer(conus_union_modis, dist = 2000) # +2km in sinusoidal MODIS crs
conus_buff_modis = st_sf(conus_buff_modis)
conus_buff_wgs84 = st_transform(conus_buff_modis, crs = 4326)
rm(conus_buff_modis, conus_union_modis, conus_union)

Adjust Bounding Box Towards Upper Left Corners

Each USGS tile is indexed by its upper left corner, as integers, with a one degree interval between them.

grid_bounds = st_bbox(conus_buff_wgs84)
grid_bounds

##       xmin       ymin       xmax       ymax 
## -124.90044   24.37832  -66.85264   49.40234

ul_bounds = sapply(grid_bounds, trunc) + c(-1,1,-1,1)
ul_bounds

## xmin ymin xmax ymax 
## -125   25  -67   50

Create 1 Degree Tiles Across CONUS

Covering the rectangular bounding box of the shape restricting our 2020 CONUS modeling grid

x_borders = ul_bounds[["xmin"]]:ul_bounds[["xmax"]]
y_borders = ul_bounds[["ymin"]]:ul_bounds[["ymax"]]

boxes = list()

# loop from lower left
for(xi in x_borders){
  for(yi in y_borders){
    feature <- st_as_sfc(st_bbox(c(xmin = xi, xmax = xi + 1, 
                                        ymin = yi - 1, ymax = yi), crs = 4326))
    this_tile <- data.frame(tilename = paste0("n", yi, "w", 
                            str_pad(-1*xi, width = 3, side = "left", pad = "0")))
    boxes[[length(boxes)+1]] <- st_sf(feature, this_tile)
  }
}
boxes <- do.call(rbind, boxes)
boxes

## Simple feature collection with 1534 features and 1 field
## geometry type:  POLYGON
## dimension:      XY
## bbox:           xmin: -125 ymin: 24 xmax: -66 ymax: 50
## epsg (SRID):    4326
## proj4string:    +proj=longlat +datum=WGS84 +no_defs
## First 10 features:
##    tilename                        feature
## 1   n25w125 POLYGON ((-125 24, -124 24,...
## 2   n26w125 POLYGON ((-125 25, -124 25,...
## 3   n27w125 POLYGON ((-125 26, -124 26,...
## 4   n28w125 POLYGON ((-125 27, -124 27,...
## 5   n29w125 POLYGON ((-125 28, -124 28,...
## 6   n30w125 POLYGON ((-125 29, -124 29,...
## 7   n31w125 POLYGON ((-125 30, -124 30,...
## 8   n32w125 POLYGON ((-125 31, -124 31,...
## 9   n33w125 POLYGON ((-125 32, -124 32,...
## 10  n34w125 POLYGON ((-125 33, -124 33,...

Intersect Tiles with CONUS shape

Removing uneccessary tiles in Canada, Mexico, and over oceans.

conus_inters <- st_intersects(boxes, conus_buff_wgs84, sparse = FALSE)

## although coordinates are longitude/latitude, st_intersects assumes that they are planar

conus_boxes = boxes[conus_inters, ]
conus_boxes

## Simple feature collection with 976 features and 1 field
## geometry type:  POLYGON
## dimension:      XY
## bbox:           xmin: -125 ymin: 24 xmax: -66 ymax: 50
## epsg (SRID):    4326
## proj4string:    +proj=longlat +datum=WGS84 +no_defs
## First 10 features:
##    tilename                        feature
## 16  n40w125 POLYGON ((-125 39, -124 39,...
## 17  n41w125 POLYGON ((-125 40, -124 40,...
## 18  n42w125 POLYGON ((-125 41, -124 41,...
## 19  n43w125 POLYGON ((-125 42, -124 42,...
## 20  n44w125 POLYGON ((-125 43, -124 43,...
## 21  n45w125 POLYGON ((-125 44, -124 44,...
## 22  n46w125 POLYGON ((-125 45, -124 45,...
## 23  n47w125 POLYGON ((-125 46, -124 46,...
## 24  n48w125 POLYGON ((-125 47, -124 47,...
## 25  n49w125 POLYGON ((-125 48, -124 48,...

Tile Map

mapview(conus_buff_wgs84, alpha.regions = 0, color = "black", legend = FALSE) + 
  mapview(conus_boxes, legend = FALSE)

Download list

1 degree tiles of 1 arc-second resolution (~30m) USGS 3DEP elevation grid

download_list <- paste0("https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/1/TIFF/",
                        conus_boxes$tilename, "/",
                        "USGS_1_",
                        conus_boxes$tilename, ".tif")

cat(paste("Tiles to download:", length(download_list)), "\n")

## Tiles to download: 976

Print download list

invisible(sapply(paste(download_list, "\n"), cat))

## https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/1/TIFF/n40w125/USGS_1_n40w125.tif 
## https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/1/TIFF/n41w125/USGS_1_n41w125.tif 
## https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/1/TIFF/n42w125/USGS_1_n42w125.tif 
## https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/1/TIFF/n43w125/USGS_1_n43w125.tif 
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## https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/1/TIFF/n38w124/USGS_1_n38w124.tif 
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