Subsoil Acidity (ASRIS)

Dataset Number2091
Dataset TitleSubsoil 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. Subsoil is defined as the depth range 30-80 cm. Rankings are made according to pH measurements and extrapolation between similar environments. In some soils there is no subsurface layer, so the classification refers to the two layers immediately below the surface soil. Other soils have no subsoil, and are classified as 'Not applicable'. 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 Subsoil Acidity attribute (or 'analysis data') classes have been supplied (see 'H_L3_1', 'H_L3_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_L3). 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 Subsoil 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, Subsurface Soil 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_L3LANSLU CharacterSoil Landscape Map Unit (LANSLU code)
LANDSCAPE.SoilASRIS_pH_Acidity_L3ACID_L3 CharacterSUBSOIL ACIDITY. (Legend category. See layer file for descriptions). Classes are defined according to the severity of subsoil acidity (acidic or strongly acidic), and the proportion of map unit affected.
LANDSCAPE.SoilASRIS_pH_Acidity_L3H_L3_1 NumberPercentage of map unit with non acidic subsoils
LANDSCAPE.SoilASRIS_pH_Acidity_L3H_L3_2 NumberPercentage of map unit with acidic subsoils
LANDSCAPE.SoilASRIS_pH_Acidity_L3H_L3_3 NumberPercentage of map unit with strongly acidic subsoils
LANDSCAPE.SoilASRIS_pH_Acidity_L3H_L3_X NumberPercentage of map unit which is not applicable (urban, reservoir, rock, water).

Contact Information

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