Subsurface Soil Acidity (ASRIS)

Dataset Number2090
Dataset TitleSubsurface Soil Acidity (ASRIS)
CustodianData Authority: Department for Environment and Water
Data Provider: Department for Environment and Water


DescriptionThis analysis is based on Soil Landscape Mapping of SA's agricultural districts using soil class information in the nationally-consistent ASRIS data format. Subsurface soil refers to the layer immediately below the surface, and typically has a depth range of 10-20 through to 10-30 cm. Soils are classified according to the pH of the subsurface layer. In soils where there is no subsurface (#2) layer, the subsoil (#3) layer is the default, and its pH is used in analysis. Soils are classified according to the more acidic values recorded, on the assumption that for a given soil type in a given environment, this level of acidification is possible (and probable in the absence of appropriate management). Acidic is defined as pH (measured in CaCl2) of >4.5 to < 5.5. Strongly acidic is defined as pH (CaCl2) of < 4.5. Four Subsurface Soil Acidity attribute (or 'analysis data') classes have been supplied (see 'H_L2_1', 'H_L2_2', etc. in the table below) as percentage (areal extent) values of each Soil Landscape Map Unit. Note: the sum of all percentage values for each map unit totals 100%. This analysis data is to be used for the creation of spatial data statistics. For map display purposes, each Soil Landscape Map Unit is assigned to one of eight (including 'not applicable') legend categories (ACID_L2). These map legend categories may be simplified (by grouping categories) as per the ArcGIS layer files and sample maps supplied with the data.
UsageThis dataset has been derived from the Soil Landscape Map Units spatial dataset (here combined with ASRIS soil data tables) to be used for map creation or the calculation of spatial data statistics. Used to supply Government, community groups, industry and the general public with up to date regional, subregional and catchment level land and soil attribute information for southern South Australia. The aim is to produce maps, statistics and reports displaying and describing: Land and soil attributes within southern South AustraliaSELECT 1 FROM DUAL; Land surface features affecting land use, land management and productivitySELECT 1 FROM DUAL; Limitations / suitability of land and soil for a range of agricultural and other uses. Independent professional advice should be sought before using this data for commercial decisions. Further information: National-format soil and land attributes. The Subsurface Soil Acidity (ASRIS) dataset can be viewed at NatureMaps (>Soils>Soil Chemistry Attributes). Spatial data downloads are available from Data.SA. A sample map can be downloaded from Enviro Data SA. Related datasets: Surface Soil Acidity, Subsoil Acidity, and Future Acidification Potential.

Data Quality

LineageThe dataset is based on an interpretation of 1:40,000 stereo colour aerial photography and limited field inspection of landscapes and soils by soil scientists. Soil Landscape Map Unit boundaries were determined after an integration of field observations and recordingsSELECT 1 FROM DUAL; laboratory analysesSELECT 1 FROM DUAL; stereoscopic examination of aerial photographsSELECT 1 FROM DUAL; understanding of regional landscape processes and stratigraphySELECT 1 FROM DUAL; existing soil and geological mapping data. To avoid inconsistencies and confusion, any updates to the Soil and Land Attribute mapping are to be managed by DEWNR Soil and Land Program. This data has been released under a Creative Commons licence. Where products are derived from this data, DEWNR are to be acknowledged, and any changes to the original data should be indicated.
CompletenessComplete. The spatial data is subject to amendment as and when more data become available.
Positional AccuracyThe accuracy is to the scale of mapping (50 metres at 1:50,000 and 300 metres at 1:100,000 mapping scale). The spatial data is to be used at the regional, subregional and catchment level, and can be used to provide property overviewsSELECT 1 FROM DUAL; however, cannot be used at the paddock level. South East, Kangaroo Island, Mount Lofty Ranges and the 'bottom' of Yorke Peninsula have been mapped at 1:50,000. Eyre Peninsula, the main part of Yorke Peninsula, Murray Mallee and Northern Agricultural Districts have been mapped at 1:100,000. Map unit boundaries should be treated as transition zones.

Geographic Extent

Extent NameAgricultural Region - South Australia
Min Easting or Longitude132.25
Min Northing or Latitude-38
Max Easting or Longitude141
Max Northing or Latitude-32.25

Dataset Status

Initially AcquiredJune 2017
Last UpdatedJune 2017
Update FrequencyAs required
Maintenance MethodAs required
LicenseingCC BY (Attribution)


TableNameField AliasData TypeDescription
LANDSCAPE.SoilASRIS_pH_Acidity_L2LANSLU CharacterSoil Landscape Map Unit (LANSLU code)
LANDSCAPE.SoilASRIS_pH_Acidity_L2ACID_L2 CharacterSUBSURFACE SOIL ACIDITY. (Legend category. See layer files for descriptions). Classes are based on an interpretation of soil landscape map units. Classes are defined according to the severity of the acidity (acidic or strongly acidic), and the proportion of the map unit affected.
LANDSCAPE.SoilASRIS_pH_Acidity_L2H_L2_1 NumberPercentage of map unit with non acidic subsurface soils
LANDSCAPE.SoilASRIS_pH_Acidity_L2H_L2_2 NumberPercentage of map unit with acidic subsurface soils
LANDSCAPE.SoilASRIS_pH_Acidity_L2H_L2_3 NumberPercentage of map unit with strongly acidic subsurface soils
LANDSCAPE.SoilASRIS_pH_Acidity_L2H_L2_X NumberPercentage of map unit which is not applicable (urban, reservoir, rock, water, etc.).

Contact Information

OrganisationDepartment for Environment and Water
Science Monitoring and Knowledge
Postal AddressGPO Box 1047