Depth to Hard Rock

Dataset Number1055
Dataset TitleDepth to Hard Rock
CustodianData Authority: Department for Environment and Water
Data Provider: Department for Environment and Water


DescriptionHard rock at shallow depth influences the effective rootzone of plants and is defined as material which is too hard to dig with hand tools, impacting on engineering uses of land. Hard rock is basement or country rock, many millions of years old, which generally occurs at or near the surface in the hilly country of the Mount Lofty Ranges, Northern Agricultural Districts, Eastern and Lower Eyre Peninsula, Central Yorke Peninsula and Kangaroo Island. Hard rock is distinguished from hardpan because it tends to become harder with depth, in contrast to hardpans which are generally hardest at the top, and become softer with depth. Depth to hard material is routinely measured during field survey where it occurs within a metre or so of the surface. Seven Hard Rock Depth analysis data classes (including not applicable) have been supplied as percentage values of Soil Landscape Map Units to be used for the calculation of spatial data statistics. Note: the sum of all percentage values for each map unit totals 100%. Soil Landscape Map Units are categorised INTO six (plus not applicable) legend categories (ROCK_DEPTH) according to the estimated average depth to hard rock. There is often significant variation from the assigned category within a map unit.
UsageLink to Soil Attribute Descriptions. This dataset has been derived from the Soil Landscape Map Units spatial dataset 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 in commercial decisions. Further information: soil and land attributes. Depth to Hard Rock dataset can be viewed on NatureMaps (>Soils>Soil Physical Condition Attributes). Spatial data downloads are available from Data SA.

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 Acquired01-JAN-2000
Last Updated01-JUL-2009
Update FrequencyAs required
Maintenance MethodAs required
LicenseingCC BY (Attribution)


TableNameField AliasData TypeDescription
Landscape.SALAD_HardRock_DepthLANSLU textSoil Landscape Map Unit.
Landscape.SALAD_HardRock_DepthROCK_DEPTH textAverage Depth to Hard Rock (Legend category. See layer file for descriptions).
Landscape.SALAD_HardRock_DepthXR1 NumberPercentage of map unit with greater than 150 cm average depth to hard rock.
Landscape.SALAD_HardRock_DepthXR2 NumberPercentage of map unit with 100 - 150 cm average depth to hard rock.
Landscape.SALAD_HardRock_DepthXR3 NumberPercentage of map unit with 50 - 100 cm average depth to hard rock.
Landscape.SALAD_HardRock_DepthXR4 NumberPercentage of map unit with 25 - 50 cm average depth to hard rock.
Landscape.SALAD_HardRock_DepthXR5 NumberPercentage of map unit with 10 - 25 cm average depth to hard rock.
Landscape.SALAD_HardRock_DepthXR6 NumberPercentage of map unit with less than 10 cm average depth to hard rock.
Landscape.SALAD_HardRock_DepthXRX NumberPercentage of map unit which is not applicable.

Contact Information

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