Depth to Hardpan

Dataset Number1054
Dataset TitleDepth to Hardpan
CustodianData Authority: Department for Environment and Water
Data Provider: Department for Environment and Water

Description

DescriptionHardpan is defined as material which is too hard to dig with hand tools, and at shallow depth, influences the effective rootzone of plants and impacts on engineering uses of land. Hardpans (including calcrete, ferricrete and silcrete) are generally relatively young materials cemented or indurated, in or below the soil, developed as part of soil forming processes. Calcrete is by far the most common, being widespread on Eyre and Yorke Peninsulas, Murraylands, the South East and Gulf Plains. Hard rock is distinguished from hardpan as 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 Hardpan Depth analysis data classes (including not applicable) have been supplied as percentagel 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 (PAN_DEPTH) according to the estimated average depth to hardpan. 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 Australia; Land surface features affecting land use, land management and productivity; 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 Hardpan 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 recordings; laboratory analyses; stereoscopic examination of aerial photographs; understanding of regional landscape processes and stratigraphy; 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 overviews; 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
AusGOALCC BY (Attribution)

Attributes

TableNameField AliasData TypeDescription
Landscape.SALAD_Hardpan_DepthLANSLU textSoil Landscape Map Unit.
Landscape.SALAD_Hardpan_DepthPAN_DEPTH textAverage Depth to Hardpan (Legend category. See layer file for descriptions).
Landscape.SALAD_Hardpan_DepthXP1 NumberPercentage of map unit with greater than 150 cm average depth to hardpan.
Landscape.SALAD_Hardpan_DepthXP2 NumberPercentage of map unit with 100 - 150 cm average depth to hardpan.
Landscape.SALAD_Hardpan_DepthXP3 NumberPercentage of map unit with 50 - 100 cm average depth to hardpan.
Landscape.SALAD_Hardpan_DepthXP4 NumberPercentage of map unit with 25 - 50 cm average depth to hardpan.
Landscape.SALAD_Hardpan_DepthXP5 NumberPercentage of map unit with 10 - 25 cm average depth to hardpan.
Landscape.SALAD_Hardpan_DepthXP6 NumberPercentage of map unit with less than 10 cm average depth to hardpan.
Landscape.SALAD_Hardpan_DepthXPX NumberPercentage of map unit which is not applicable.

Contact Information

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

ADELAIDE
5001
EmailDEWNR.CustomerServiceCentre@sa.gov.au