Title: | Landscape Visualizations in R and 'Unity' |
---|---|
Description: | Functions for the retrieval, manipulation, and visualization of 'geospatial' data, with an aim towards producing '3D' landscape visualizations in the 'Unity' '3D' rendering engine. Functions are also provided for retrieving elevation data and base map tiles from the 'USGS' National Map <https://apps.nationalmap.gov/services/>. |
Authors: | Michael Mahoney [aut, cre] , Mike Johnson [rev] (Mike reviewed the package (v. 0.2.1) for rOpenSci, see <https://github.com/ropensci/software-review/issues/416>), Sydney Foks [rev] (Sydney reviewed the package (v. 0.2.1) for rOpenSci, see <https://github.com/ropensci/software-review/issues/416>) |
Maintainer: | Michael Mahoney <[email protected]> |
License: | MIT + file LICENSE |
Version: | 0.7.5.9000 |
Built: | 2024-09-13 05:25:17 UTC |
Source: | https://github.com/ropensci/terrainr |
add_bbox_buffer calculates the great circle distance both corners of your bounding box are from the centroid and extends those by a set distance. Due to using Haversine/great circle distance, latitude/longitude calculations will not be exact.
set_bbox_side_length is a thin wrapper around add_bbox_buffer which sets all sides of the bounding box to (approximately) a specified length.
Both of these functions are intended to be used with geographic coordinate systems (data using longitude and latitude for position). For projected coordinate systems, a more sane approach is to use sf::st_buffer to add a buffer, or combine sf::st_centroid with the buffer to set a specific side length.
add_bbox_buffer(data, distance, distance_unit = "meters", error_crs = NULL) ## S3 method for class 'sf' add_bbox_buffer(data, distance, distance_unit = "meters", error_crs = NULL) ## S3 method for class 'Raster' add_bbox_buffer(data, distance, distance_unit = "meters", error_crs = NULL) ## S3 method for class 'SpatRaster' add_bbox_buffer(data, distance, distance_unit = "meters", error_crs = NULL) set_bbox_side_length( data, distance, distance_unit = "meters", error_crs = NULL ) ## S3 method for class 'sf' set_bbox_side_length( data, distance, distance_unit = "meters", error_crs = NULL ) ## S3 method for class 'Raster' set_bbox_side_length( data, distance, distance_unit = "meters", error_crs = NULL ) ## S3 method for class 'SpatRaster' set_bbox_side_length( data, distance, distance_unit = "meters", error_crs = NULL )
add_bbox_buffer(data, distance, distance_unit = "meters", error_crs = NULL) ## S3 method for class 'sf' add_bbox_buffer(data, distance, distance_unit = "meters", error_crs = NULL) ## S3 method for class 'Raster' add_bbox_buffer(data, distance, distance_unit = "meters", error_crs = NULL) ## S3 method for class 'SpatRaster' add_bbox_buffer(data, distance, distance_unit = "meters", error_crs = NULL) set_bbox_side_length( data, distance, distance_unit = "meters", error_crs = NULL ) ## S3 method for class 'sf' set_bbox_side_length( data, distance, distance_unit = "meters", error_crs = NULL ) ## S3 method for class 'Raster' set_bbox_side_length( data, distance, distance_unit = "meters", error_crs = NULL ) ## S3 method for class 'SpatRaster' set_bbox_side_length( data, distance, distance_unit = "meters", error_crs = NULL )
data |
The original data to add a buffer around. Must be either an |
distance |
The distance to add or to set side lengths equal to. |
distance_unit |
The units of the distance to add to the buffer, passed to units::as_units. |
error_crs |
Logical: Should this function error if |
An sfc
object (from sf::st_as_sfc).
Other utilities:
calc_haversine_distance()
,
deg_to_rad()
,
get_centroid()
,
rad_to_deg()
df <- data.frame( lat = c(44.04905, 44.17609), lng = c(-74.01188, -73.83493) ) df_sf <- sf::st_as_sf(df, coords = c("lng", "lat")) df_sf <- sf::st_set_crs(df_sf, 4326) add_bbox_buffer(df_sf, 10) df <- data.frame( lat = c(44.04905, 44.17609), lng = c(-74.01188, -73.83493) ) df_sf <- sf::st_as_sf(df, coords = c("lng", "lat")) df_sf <- sf::st_set_crs(df_sf, 4326) set_bbox_side_length(df_sf, 4000)
df <- data.frame( lat = c(44.04905, 44.17609), lng = c(-74.01188, -73.83493) ) df_sf <- sf::st_as_sf(df, coords = c("lng", "lat")) df_sf <- sf::st_set_crs(df_sf, 4326) add_bbox_buffer(df_sf, 10) df <- data.frame( lat = c(44.04905, 44.17609), lng = c(-74.01188, -73.83493) ) df_sf <- sf::st_as_sf(df, coords = c("lng", "lat")) df_sf <- sf::st_set_crs(df_sf, 4326) set_bbox_side_length(df_sf, 4000)
This function combines any number of images into a single file, which may then be further processed as an image or transformed into an image overlay.
combine_overlays( ..., output_file = tempfile(fileext = ".png"), transparency = 0 )
combine_overlays( ..., output_file = tempfile(fileext = ".png"), transparency = 0 )
... |
File paths for images to be combined. Note that combining TIFF
images requires the |
output_file |
The path to save the resulting image to. Can
be any format accepted by magick::image_read. Optionally, can be set to
|
transparency |
A value indicating how much transparency should be added to each image. If less than 1, interpreted as a proportion (so a value of 0.1 results in each image becoming 10% more transparent); if between 1 and 100, interpreted as a percentage (so a value of 10 results in each image becoming 10% more transparent.) A value of 0 is equivalent to no additional transparency. |
If output_file
is not null, output_file
, invisibly. If
output_file
is null, a magick
image object.
Other data manipulation functions:
georeference_overlay()
,
merge_rasters()
,
raster_to_raw_tiles()
,
vector_to_overlay()
Other overlay creation functions:
georeference_overlay()
,
vector_to_overlay()
Other visualization functions:
geom_spatial_rgb()
,
raster_to_raw_tiles()
,
vector_to_overlay()
## Not run: # Generate points and download orthoimagery mt_elbert_points <- data.frame( lat = runif(100, min = 39.11144, max = 39.12416), lng = runif(100, min = -106.4534, max = -106.437) ) mt_elbert_sf <- sf::st_as_sf(mt_elbert_points, coords = c("lng", "lat")) sf::st_crs(mt_elbert_sf) <- sf::st_crs(4326) output_files <- get_tiles( mt_elbert_sf, output_prefix = tempfile(), services = c("ortho") ) # Merge orthoimagery into a single file ortho_merged <- merge_rasters( input_rasters = output_files[1], output_raster = tempfile(fileext = ".tif") ) # Convert our points into an overlay mt_elbert_overlay <- vector_to_overlay(mt_elbert_sf, ortho_merged[[1]], size = 15, color = "red", na.rm = TRUE ) # Combine the overlay with our orthoimage ortho_with_points <- combine_overlays( ortho_merged[[1]], mt_elbert_overlay ) ## End(Not run)
## Not run: # Generate points and download orthoimagery mt_elbert_points <- data.frame( lat = runif(100, min = 39.11144, max = 39.12416), lng = runif(100, min = -106.4534, max = -106.437) ) mt_elbert_sf <- sf::st_as_sf(mt_elbert_points, coords = c("lng", "lat")) sf::st_crs(mt_elbert_sf) <- sf::st_crs(4326) output_files <- get_tiles( mt_elbert_sf, output_prefix = tempfile(), services = c("ortho") ) # Merge orthoimagery into a single file ortho_merged <- merge_rasters( input_rasters = output_files[1], output_raster = tempfile(fileext = ".tif") ) # Convert our points into an overlay mt_elbert_overlay <- vector_to_overlay(mt_elbert_sf, ortho_merged[[1]], size = 15, color = "red", na.rm = TRUE ) # Combine the overlay with our orthoimage ortho_with_points <- combine_overlays( ortho_merged[[1]], mt_elbert_overlay ) ## End(Not run)
geom_spatial_rgb
and stat_spatial_rgb
allow users to plot three-band RGB
rasters in ggplot2, using these layers as background base maps for other
spatial plotting. Note that unlike ggplot2::geom_sf, this function does
not force ggplot2::coord_sf; for accurate mapping, add
ggplot2::coord_sf with a crs
value matching your input raster as a layer.
geom_spatial_rgb( mapping = NULL, data = NULL, stat = "spatialRGB", position = "identity", ..., hjust = 0.5, vjust = 0.5, interpolate = FALSE, na.rm = FALSE, show.legend = NA, inherit.aes = TRUE, scale = NULL ) stat_spatial_rgb( mapping = NULL, data = NULL, geom = "raster", position = "identity", na.rm = FALSE, show.legend = FALSE, inherit.aes = TRUE, scale = NULL, ... )
geom_spatial_rgb( mapping = NULL, data = NULL, stat = "spatialRGB", position = "identity", ..., hjust = 0.5, vjust = 0.5, interpolate = FALSE, na.rm = FALSE, show.legend = NA, inherit.aes = TRUE, scale = NULL ) stat_spatial_rgb( mapping = NULL, data = NULL, geom = "raster", position = "identity", na.rm = FALSE, show.legend = FALSE, inherit.aes = TRUE, scale = NULL, ... )
mapping |
Set of aesthetic mappings created by |
data |
The data to be displayed in this layer. In addition to the three options described in ggplot2::geom_raster, there are two additional methods: If a If a length-1 character vector, this function will attempt to load the object via terra::rast. |
stat |
The statistical transformation to use on the data for this
layer, either as a |
position |
Position adjustment, either as a string naming the adjustment
(e.g. |
... |
Other arguments passed on to |
hjust , vjust
|
horizontal and vertical justification of the grob. Each justification value should be a number between 0 and 1. Defaults to 0.5 for both, centering each pixel over its data location. |
interpolate |
If |
na.rm |
If |
show.legend |
logical. Should this layer be included in the legends?
|
inherit.aes |
If |
scale |
Integer. Maximum (possible) value in the three channels.
If |
geom |
The geometric object to use to display the data, either as a
|
Other visualization functions:
combine_overlays()
,
raster_to_raw_tiles()
,
vector_to_overlay()
## Not run: simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) simulated_data <- sf::st_set_crs(simulated_data, 4326) output_tiles <- get_tiles(simulated_data, services = c("ortho"), resolution = 120 ) merged_ortho <- tempfile(fileext = ".tif") merge_rasters(output_tiles[["ortho"]], merged_ortho) merged_stack <- terra::rast(merged_ortho) library(ggplot2) ggplot() + geom_spatial_rgb( data = merged_ortho, mapping = aes( x = x, y = y, r = red, g = green, b = blue ) ) + geom_sf(data = simulated_data) + coord_sf(crs = 4326) ggplot() + geom_spatial_rgb( data = merged_stack, mapping = aes( x = x, y = y, r = red, g = green, b = blue ) ) + geom_sf(data = simulated_data) + coord_sf(crs = 4326) ## End(Not run)
## Not run: simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) simulated_data <- sf::st_set_crs(simulated_data, 4326) output_tiles <- get_tiles(simulated_data, services = c("ortho"), resolution = 120 ) merged_ortho <- tempfile(fileext = ".tif") merge_rasters(output_tiles[["ortho"]], merged_ortho) merged_stack <- terra::rast(merged_ortho) library(ggplot2) ggplot() + geom_spatial_rgb( data = merged_ortho, mapping = aes( x = x, y = y, r = red, g = green, b = blue ) ) + geom_sf(data = simulated_data) + coord_sf(crs = 4326) ggplot() + geom_spatial_rgb( data = merged_stack, mapping = aes( x = x, y = y, r = red, g = green, b = blue ) ) + geom_sf(data = simulated_data) + coord_sf(crs = 4326) ## End(Not run)
This function georeferences an image overlay based on a reference raster, setting the extent and CRS of the image to those of the raster file. To georeference multiple images and merge them into a single file, see merge_rasters.
georeference_overlay( overlay_file, reference_raster, output_file = tempfile(fileext = ".tif") )
georeference_overlay( overlay_file, reference_raster, output_file = tempfile(fileext = ".tif") )
overlay_file |
The image overlay to georeference. File format will be
detected automatically from file extension; options include |
reference_raster |
The raster file to base georeferencing on. The output image will have the same extent and CRS as the reference raster. Accepts anything that can be read by terra::rast |
output_file |
The path to write the georeferenced image file to. Must be a TIFF. |
The file path written to, invisibly.
Other data manipulation functions:
combine_overlays()
,
merge_rasters()
,
raster_to_raw_tiles()
,
vector_to_overlay()
Other overlay creation functions:
combine_overlays()
,
vector_to_overlay()
## Not run: simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.1114, 44.1123), lng = runif(100, -73.92273, -73.92147) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) downloaded_tiles <- get_tiles(simulated_data, services = c("elevation", "ortho"), georeference = FALSE ) georeference_overlay( overlay_file = downloaded_tiles[[2]], reference_raster = downloaded_tiles[[1]], output_file = tempfile(fileext = ".tif") ) ## End(Not run)
## Not run: simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.1114, 44.1123), lng = runif(100, -73.92273, -73.92147) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) downloaded_tiles <- get_tiles(simulated_data, services = c("elevation", "ortho"), georeference = FALSE ) georeference_overlay( overlay_file = downloaded_tiles[[2]], reference_raster = downloaded_tiles[[1]], output_file = tempfile(fileext = ".tif") ) ## End(Not run)
This function splits the area contained within a bounding box into a set of tiles, and retrieves data from the USGS National map for each tile. As of version 0.5.0, the method for lists has been deprecated.
get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'sf' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'sfc' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'Raster' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'SpatRaster' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'list' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... )
get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'sf' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'sfc' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'Raster' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'SpatRaster' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... ) ## S3 method for class 'list' get_tiles( data, output_prefix = tempfile(), side_length = NULL, resolution = 1, services = "elevation", verbose = FALSE, georeference = TRUE, projected = NULL, ... )
data |
An |
output_prefix |
The file prefix to use when saving tiles. |
side_length |
The length, in meters, of each side of tiles to download.
If |
resolution |
How many meters are represented by each pixel? The default value of 1 means that 1 pixel = 1 meter, while a value of 2 means that 1 pixel = 2 meters, and so on. |
services |
A character vector of services to download data from. Current options include "3DEPElevation", "USGSNAIPPlus", and "nhd". Users can also use short codes to download a specific type of data without specifying the source; current options for short codes include "elevation" (equivalent to "3DEPElevation"), "ortho" (equivalent to "USGSNAIPPlus), and "hydro" ("nhd"). Short codes are not guaranteed to refer to the same source across releases. Short codes are converted to their service name and then duplicates are removed, so any given source will only be queried once per tile. |
verbose |
Logical: should tile retrieval functions run in verbose mode? |
georeference |
Logical: should tiles be downloaded as PNGs without georeferencing, or should they be downloaded as georeferenced TIFF files? This option does nothing when only elevation data is being downloaded. |
projected |
Logical: is |
... |
Additional arguments passed to hit_national_map_api. These can be used to change default query parameters or as additional options for the National Map services. See below for more details. |
A list of the same length as the number of unique services requested, containing named vectors of where data files were saved to. Returned invisibly.
The following services are currently available (with short codes in parentheses where applicable). See links for API documentation.
3DEPElevation (short code: elevation)
USGSNAIPPlus (short code: ortho)
nhd (short code: hydro)
wbd ("short code": watersheds)
The ...
argument can be used to pass additional arguments to the
National Map API or to edit the hard-coded defaults used by this function.
More information on common arguments to change can be found in
hit_national_map_api. Note that ...
can also be used to change
the formats returned by the server, but that doing so while using this
function will likely cause the function to error (or corrupt the output
data). To download files in different formats, use hit_national_map_api.
Other data retrieval functions:
hit_national_map_api()
## Not run: simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) get_tiles(simulated_data, tempfile()) ## End(Not run)
## Not run: simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) get_tiles(simulated_data, tempfile()) ## End(Not run)
These functions crop input raster files into smaller square tiles and then converts them into either .png or .raw files which are ready to be imported into the Unity game engine. make_manifest also writes a "manifest" file and importer script which may be used to automatically import the tiles into Unity.
make_manifest( heightmap, overlay = NULL, output_prefix = "import", manifest_path = "terrainr.manifest", importer_path = "import_terrain.cs" ) transform_elevation(heightmap, side_length = 4097, output_prefix = "import") transform_overlay(overlay, side_length = 4097, output_prefix = "import")
make_manifest( heightmap, overlay = NULL, output_prefix = "import", manifest_path = "terrainr.manifest", importer_path = "import_terrain.cs" ) transform_elevation(heightmap, side_length = 4097, output_prefix = "import") transform_overlay(overlay, side_length = 4097, output_prefix = "import")
heightmap |
File path to the heightmap to transform. |
overlay |
File path to the image overlay to transform. Optional for make_manifest. |
output_prefix |
The file path to prefix output tiles with. |
manifest_path |
File path to write the manifest file to. |
importer_path |
File name to write the importer script to. Set to NULL to not copy the importer script. Will overwrite any file at the same path. |
side_length |
Side length, in pixels, of each output tile. If the raster
has dimensions not evenly divisible by |
manifest_path
, invisibly.
## Not run: if (!isTRUE(as.logical(Sys.getenv("CI")))) { simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) output_files <- get_tiles(simulated_data) temptiff <- tempfile(fileext = ".tif") merge_rasters(output_files["elevation"][[1]], temptiff) make_manifest(temptiff, output_prefix = tempfile(), importer_path = NULL) } ## End(Not run)
## Not run: if (!isTRUE(as.logical(Sys.getenv("CI")))) { simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) output_files <- get_tiles(simulated_data) temptiff <- tempfile(fileext = ".tif") merge_rasters(output_files["elevation"][[1]], temptiff) make_manifest(temptiff, output_prefix = tempfile(), importer_path = NULL) } ## End(Not run)
Initialize terrain inside of a Unity project.
make_unity( project, heightmap, overlay = NULL, side_length = 4097, scene_name = "terrainr_scene", action = TRUE, unity = find_unity() )
make_unity( project, heightmap, overlay = NULL, side_length = 4097, scene_name = "terrainr_scene", action = TRUE, unity = find_unity() )
project |
The directory path of the Unity project to create terrain inside. |
heightmap |
The file path for the raster to transform into terrain. |
overlay |
Optionally, a file path for an image overlay to layer on top of the terrain surface. Leave as NULL for no overlay. |
side_length |
The side length, in map units, for the terrain tiles. Must be equal to 2^x + 1, for any x between 5 and 12. |
scene_name |
The name of the Unity scene to create the terrain in. |
action |
Boolean: Execute the unifir "script" and create the Unity project? If FALSE, returns a non-executed script. |
unity |
The location of the Unity executable to create projects with. By default, will be auto-detected by unifir::find_unity |
An object of class "unifir_script", containing either an executed unifir script (if action = TRUE) or a non-executed script object (if action = FALSE).
## Not run: if (!isTRUE(as.logical(Sys.getenv("CI")))) { simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) output_files <- get_tiles(simulated_data) temptiff <- tempfile(fileext = ".tif") merge_rasters(output_files["elevation"][[1]], temptiff) make_unity(file.path(tempdir(), "unity"), temptiff) } ## End(Not run)
## Not run: if (!isTRUE(as.logical(Sys.getenv("CI")))) { simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) output_files <- get_tiles(simulated_data) temptiff <- tempfile(fileext = ".tif") merge_rasters(output_files["elevation"][[1]], temptiff) make_unity(file.path(tempdir(), "unity"), temptiff) } ## End(Not run)
Some functions like get_tiles return multiple separate files when it can be useful to have a single larger raster instead. This function is a thin wrapper over sf::gdal_utils, making it easy to collapse those multiple raster files into a single TIFF.
merge_rasters( input_rasters, output_raster = tempfile(fileext = ".tif"), options = character(0), overwrite = FALSE, force_fallback = FALSE )
merge_rasters( input_rasters, output_raster = tempfile(fileext = ".tif"), options = character(0), overwrite = FALSE, force_fallback = FALSE )
input_rasters |
A character vector containing the file paths to the georeferenced rasters you want to use. |
output_raster |
The file path to save the merged georeferenced raster to. |
options |
Optionally, a character vector of options to be passed directly to sf::gdal_utils. If the fallback is used and any options (other than "-overwrite") are specified, this will issue a warning. |
overwrite |
Logical: overwrite |
force_fallback |
Logical: if TRUE, uses the much slower fallback method by default. This is used for testing purposes and is not recommended for use by end users. |
output_raster
, invisibly.
Other data manipulation functions:
combine_overlays()
,
georeference_overlay()
,
raster_to_raw_tiles()
,
vector_to_overlay()
## Not run: simulated_data <- data.frame( lat = c(44.10379, 44.17573), lng = c(-74.01177, -73.91171) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) img_files <- get_tiles(simulated_data) merge_rasters(img_files[[1]]) ## End(Not run)
## Not run: simulated_data <- data.frame( lat = c(44.10379, 44.17573), lng = c(-74.01177, -73.91171) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) img_files <- get_tiles(simulated_data) merge_rasters(img_files[[1]]) ## End(Not run)
This function has been deprecated as of terrainr 0.5.0 in favor of the new function, make_manifest. While it will be continued to be exported until at least 2022, improvements and bug fixes will only be made to the new function. Please open an issue if any features you relied upon is missing from the new function!
raster_to_raw_tiles(input_file, output_prefix, side_length = 4097, raw = TRUE)
raster_to_raw_tiles(input_file, output_prefix, side_length = 4097, raw = TRUE)
input_file |
File path to the input TIFF file to convert. |
output_prefix |
The file path to prefix output tiles with. |
side_length |
The side length, in pixels, for the .raw tiles. |
raw |
Logical: Convert the cropped tiles to .raw? When |
This function crops input raster files into smaller square tiles and then converts them into either .png or .raw files which are ready to be imported into the Unity game engine.
Invisibly, a character vector containing the file paths that were written to.
Other data manipulation functions:
combine_overlays()
,
georeference_overlay()
,
merge_rasters()
,
vector_to_overlay()
Other visualization functions:
combine_overlays()
,
geom_spatial_rgb()
,
vector_to_overlay()
## Not run: if (!isTRUE(as.logical(Sys.getenv("CI")))) { simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) output_files <- get_tiles(simulated_data) temptiff <- tempfile(fileext = ".tif") merge_rasters(output_files["elevation"][[1]], temptiff) raster_to_raw_tiles(temptiff, tempfile()) } ## End(Not run)
## Not run: if (!isTRUE(as.logical(Sys.getenv("CI")))) { simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.04905, 44.17609), lng = runif(100, -74.01188, -73.83493) ) simulated_data <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) output_files <- get_tiles(simulated_data) temptiff <- tempfile(fileext = ".tif") merge_rasters(output_files["elevation"][[1]], temptiff) raster_to_raw_tiles(temptiff, tempfile()) } ## End(Not run)
This function allows users to quickly transform any vector data into an image overlay, which may then be imported as a texture into Unity.
vector_to_overlay( vector_data, reference_raster, output_file = NULL, transparent = "#ffffff", ..., error_crs = NULL )
vector_to_overlay( vector_data, reference_raster, output_file = NULL, transparent = "#ffffff", ..., error_crs = NULL )
vector_data |
The spatial vector data set to be transformed into an
overlay image. Users may provide either an |
reference_raster |
The raster file to produce an overlay for. The output overlay will have the same extent and resolution as the input raster. Users may provide either a Raster* object or a length 1 character vector containing a path to a file readable by terra::rast. |
output_file |
The path to save the image overlay to. If |
transparent |
The hex code for a color to be made transparent in the
final image. Set to |
... |
Arguments passed to |
error_crs |
Logical: Should this function error if |
output_file
, invisibly.
Other data manipulation functions:
combine_overlays()
,
georeference_overlay()
,
merge_rasters()
,
raster_to_raw_tiles()
Other overlay creation functions:
combine_overlays()
,
georeference_overlay()
Other visualization functions:
combine_overlays()
,
geom_spatial_rgb()
,
raster_to_raw_tiles()
## Not run: # Generate points to download raster tiles for set.seed(123) simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.1114, 44.1123), lng = runif(100, -73.92273, -73.92147) ) # Create an sf object from our original simulated data simulated_data_sf <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) sf::st_crs(simulated_data_sf) <- sf::st_crs(4326) # Download data! downloaded_tiles <- get_tiles(simulated_data_sf, tempfile()) merged_file <- merge_rasters( downloaded_tiles[[1]], tempfile(fileext = ".tif") ) # Create an overlay image vector_to_overlay(simulated_data_sf, merged_file[[1]], na.rm = TRUE) ## End(Not run)
## Not run: # Generate points to download raster tiles for set.seed(123) simulated_data <- data.frame( id = seq(1, 100, 1), lat = runif(100, 44.1114, 44.1123), lng = runif(100, -73.92273, -73.92147) ) # Create an sf object from our original simulated data simulated_data_sf <- sf::st_as_sf(simulated_data, coords = c("lng", "lat")) sf::st_crs(simulated_data_sf) <- sf::st_crs(4326) # Download data! downloaded_tiles <- get_tiles(simulated_data_sf, tempfile()) merged_file <- merge_rasters( downloaded_tiles[[1]], tempfile(fileext = ".tif") ) # Create an overlay image vector_to_overlay(simulated_data_sf, merged_file[[1]], na.rm = TRUE) ## End(Not run)