New Zealand Gridded Land Information Dataset (NZGLID)

The New Zealand Gridded Land Information Dataset integrates data from various sources to offer detailed spatial information about the land, soil, terrain, and environment of New Zealand's mainland. The dataset is available at spatial resolutions of 5 km and 1 km (WGS84). The input data were processed to achieve the final resolutions by rasterizing geospatial vector layers and reprojecting and performing bilinear resampling of raster layers.

The full dataset can be accessed by downloading the following files:

• NZGLID_5km_2.0.nc
• NZGLID_1km_2.0.nc

Individual variable files are also available in .zip folders.

Variables

The NZGLID comprises a total of 23 variables: aspect, cation exchange capacity, depth to slowly permeable horizon, drainage, elevation, erosion severity, flood return interval, land cover, land use capability, LUCAS land use, particle size, permeability profile, ph, phosphate rentation, potential rooting depth, profile readily available water, profile total available water, rock outcrops and surface boulders, salinity, slope, soil temperature regime, topsoil gravel content, total carbon.

Using the data

The data is provided in the NetCDF format following the CF Convention. NetCDF files can be opened and manipulated in GIS softwares (e.g., QGIS) or using programing languages (e.g., Python, R).

Categorical data are provided as numerical values. Users should refer to the flag_values and flag_meanings attributes for the correspondence between values and categories.

Releases Notes

The elevation new variable has been integrated in the NZGLID v2.0, while the versions of land cover and LUCAS land use input data have been updated to v6 and v5, respectively. The v2.0 fixes the land cover missing data in the v1.1 and the negative values present for the slope variable have been corrected and set to 0. The variable rock has been renamed rock outcrops surface boulders. As results of the above updates, minor differences can be observed in the slope, land use capability, land cover, and LUCAS land use variables between the versions 1.1 and 2.0 of the dataset.