Landscape Visualizations in R and 'Unity'
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/>').
terrainr makes it easy to retrieve elevation and base map image tiles for areas of interest within the United States from the National Map family of APIs, and then process that data into larger, joined images or crop it into tiles that can be imported into the Unity 3D rendering engine.
There are three main utilities provided by terrainr. First, users are
able to download data from the National Map via the
function, downloading data tiles for the area represented by an
library(terrainr) library(sf) # Optional way to display a progress bar while your tiles download: library(progressr) handlers("progress") 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 <- st_as_sf(simulated_data, coords = c("lng", "lat")) simulated_data <- st_set_crs(simulated_data, 4326) with_progress( # Only needed if you're using progressr output_tiles <- get_tiles(simulated_data, services = c("elevation", "ortho"), resolution = 90 # pixel side length in meters ) )
Once downloaded, these images are in standard GeoTIFF or PNG formats and can be used as expected with other utilities:
raster::plotRGB(raster::brick(output_tiles[["ortho"]][]), scale = 1)
Secondly, terrainr provides functions for manipulating these files, editing downloaded images to create new base map tiles:
vector_overlay <- vector_to_overlay( simulated_data, output_tiles[["ortho"]] ) vector_overlay <- combine_overlays( output_tiles[["ortho"]], vector_overlay ) raster::plotRGB(raster::stack(vector_overlay))
Finally, terrainr helps you visualize this data, both natively in R via
library(ggplot2) ggplot() + geom_spatial_rgb(data = output_tiles[["ortho"]], aes(x = x, y = y, r = red, g = green, b = blue)) + geom_sf(data = simulated_data)
As well as with the Unity 3D rendering engine, allowing you to fly or walk through your downloaded data sets in 3D and VR:
with_progress( # When not specifying resolution, default is 1m pixels output_tiles <- get_tiles(simulated_data, services = c("elevation", "ortho")) ) merged_dem <- merge_rasters(output_tiles[["elevation"]], tempfile(fileext = ".tif")) merged_ortho <- merge_rasters(output_tiles[["ortho"]], tempfile(fileext = ".tif")) mapply(function(x, y) raster_to_raw_tiles(input_file = x, output_prefix = tempfile(), side_length = 4097, raw = y), c(merged_dem, merged_ortho), c(TRUE, FALSE)) # We can then import these tiles to Unity to create:
The more time intensive processing steps can all be monitored via the progressr package, so you’ll be more confident that your computer is still churning along and not just stalled out. For more information, check out the introductory vignette and the guide to importing your data into Unity!
The following datasets can currently be downloaded using
- 3DEPElevation: The USGS 3D Elevation Program (3DEP) Bare Earth DEM.
- USGSNAIPPlus: National Agriculture Imagery Program (NAIP) and high resolution orthoimagery (HRO).
- nhd: A comprehensive set of digital spatial data that encodes information about naturally occurring and constructed bodies of surface water (lakes, ponds, and reservoirs), paths through which water flows (canals, ditches, streams, and rivers), and related entities such as point features (springs, wells, stream gauges, and dams).
- govunits: Major civil areas for the Nation, including States or Territories, counties (or equivalents), Federal and Native American areas, congressional districts, minor civil divisions, incorporated places (such as cities and towns), and unincorporated places.
- contours: The USGS Elevation Contours service.
- geonames: Information about physical and cultural geographic features, geographic areas, and locational entities that are generally recognizable and locatable by name.
- NHDPlus_HR: A comprehensive set of digital spatial data comprising a nationally seamless network of stream reaches, elevation-based catchment areas, flow surfaces, and value-added attributes.
- structures: The name, function, location, and other core information and characteristics of selected manmade facilities.
- transportation: Roads, railroads, trails, airports, and other features associated with the transport of people or commerce.
- wbd: Hydrologic Unit (HU) polygon boundaries for the United States, Puerto Rico, and the U.S. Virgin Islands.
(All descriptions above taken from the National Map API descriptions.)
You can install the development version of terrainr from GitHub with:
# install.packages("devtools") devtools::install_github("ropensci/terrainr")
Code of Conduct
Please note that this package is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.
Functions in terrainr
|combine_overlays||Combine multiple image overlays into a single file|
|geom_spatial_rgb||Plot RGB rasters in ggplot2|
|addbuff||Add a uniform buffer around a bounding box|
|get_tiles||A user-friendly way to get USGS National Map data tiles for an area|
|georeference_overlay||Georeference image overlays based on a reference raster|
|get_centroid||Get the great-circle centroid for latitude/longitude data|
|calc_haversine_distance||Extract latitude and longitude from a provided object|
|deg_to_rad||Convert decimal degrees to radians|
|hit_national_map_api||Hit the USGS 3DEP API and retrieve an elevation heightmap|
|raster_to_raw_tiles||Crop a raster and convert the output tiles into new formats.|
|terrainr_coordinate_pair-class||S4 class for coordinate points in the format expected by terrainr functions.|
|vector_to_overlay||Turn spatial vector data into an image overlay|
|terrainr-package||terrainr: Landscape Visualizations in R and 'Unity'|
|point_from_distance||Find latitude and longitude for a certain distance and azimuth from a point.|
|terrainr_coordinate_pair||Construct a terrainr_coordinate_pair object.|
|rad_to_deg||Convert radians to degrees|
|merge_rasters||Merge multiple raster files into a single raster|
|terrainr_bounding_box-class||S4 class for bounding boxes in the format expected by terrainr functions.|
|terrainr_bounding_box||Construct a terrainr_bounding_box object|
Vignettes of terrainr
Last month downloads
|License||MIT + file LICENSE|
|Packaged||2021-02-22 16:46:14 UTC; mikemahoney218|
|Date/Publication||2021-02-23 08:30:02 UTC|
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