Raster layer delineates the level of uncertainty depending on the data age.
General Background: The National Vegetation Information System (NVIS) has been developed over the last 15 years from a variety of data sources. The commonwealth is reliant on states and territories to supply vegetation data, which is then collated into the NVIS. Because of varying levels of resources available to different regions, the data they are able to supply is of varying scale, age, origin and spatial mix.
NVIS is widely used by various organisation including, researchers, NGO and governments, for a wide range of uses such as modelling, fire fuel loads and policy. To improve the interpretation of the NVIS dataset the Dept of the Environment & Energy has developed a suite of uncertainty layers and tools to facilitate the robust use of the NVIS.
Aim: to develop a raster Uncertainty layer that is intended to better describe the input datasets and assist in dynamic analyses of data quality and gaps in the NVIS extant theme dataset.
Output: raster files scaled 0-1 that can be used for uncertainty, including data age, origin, scale and spatial mix. The layers can be added together to form one uncertainty layer. Python script/tools will also be provided so individuals can develop their own uncertainty layers and to be as transparent as possible.
The Uncertainty layers comprise 5 rasters, 1 composite and 5 individual layers:
- NVIS Uncertainty layer (composite of 4 below layers)
- Age: age of the NVIS data
- Origin: where the data came from
- Spatial mix: if the data is a mosaic
- Scale: scale that the data was mapped
Age, scale, origin and spatial mix Information is supplied by the states and territories as part of the NVIS resupply process.
This dataset represents a scale of uncertainty in relation to data age. Scale categories are below.
Table 1. Age Categories
Age Category value Variable name
Other 0
2005 1 VLowCC - Attribution (CC BY)
This data has been licensed under the Creative Commons Attribution 3.0 Australia Licence. More information can be found at http://www.ausgoal.gov.au/creative-commons.
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© Commonwealth of Australia (Department of the Environment and Energy) 2018