hunterCovariates_sub {tangles} | R Documentation |
Environmental Covariate Rasters for a Subset of the Lower Hunter Valley, NSW
Description
A suite of GeoTIFF rasters representing environmental covariates for a subset of the Lower Hunter Valley in New South Wales, Australia. These covariates are used in digital soil mapping and terrain analysis.
Format
The dataset consists of multiple raster layers (GeoTIFF format) located in the inst/extdata/
directory of the package, each with a spatial resolution of 25 m × 25 m and a CRS of WGS 84 UTM Zone 56.
Available files are prefixed with hunterCovariates_sub_
and include:
hunterCovariates_sub_Terrain_Ruggedness_Index.tif
Topographic ruggedness index (TRI).
hunterCovariates_sub_AACN.tif
Elevation above channel network base level.
hunterCovariates_sub_Landsat_Band1.tif
Landsat 7 ETM+ Band 1 reflectance (0.45–0.52 µm).
hunterCovariates_sub_Elevation.tif
Elevation in meters above sea level, derived from a DEM.
hunterCovariates_sub_Hillshading.tif
Hillshade raster generated from the DEM using a fixed sun angle.
hunterCovariates_sub_Light_insolation.tif
Potential solar radiation calculated over a calendar year at 5-day intervals.
hunterCovariates_sub_Mid_Slope_Position.tif
Slope position classification for crest/valley context.
hunterCovariates_sub_MRVBF.tif
Multi-resolution valley bottom flatness index.
hunterCovariates_sub_NDVI.tif
Normalized Difference Vegetation Index based on Landsat 7.
hunterCovariates_sub_TWI.tif
Topographic Wetness Index (TWI).
hunterCovariates_sub_Slope.tif
Slope angle in degrees.
Details
The subset area corresponds to the Hunter Wine Country Private Irrigation District (HWCPID) in the Lower Hunter Valley (approx. 32.83°S, 151.35°E), located ~140 km north of Sydney. The HWCPID covers around 220 km² and supports viticulture and dryland grazing under a temperate, humid climate with ~750 mm annual rainfall.
These covariates are used in spatial prediction tasks, terrain classification, and training examples in digital soil mapping.
References
Gallant, J.C., Dowling, T.I. (2003). A multiresolution index of valley bottom flatness for mapping depositional areas. Water Resources Research, 39(12), 1347. doi:10.1029/2002WR001426
Malone, B.P., Hughes, P., McBratney, A.B., Minasny, B. (2014). A model for the identification of terrons in the Lower Hunter Valley, Australia. Geoderma Regional, 1, 31–47. doi:10.1016/j.geodrs.2014.08.001
Examples
library(terra)
# Load and plot the elevation raster
elevation <- rast(system.file("extdata/hunterCovariates_sub_Elevation.tif", package = "tangles"))
plot(elevation, main = "Hunter Valley Subset - Elevation")