Native Vegetation Floristic Areas - NVIS - Statewide (Incomplete Version)

Dataset Number898
Dataset TitleNative Vegetation Floristic Areas - NVIS - Statewide (Incomplete Version)
CustodianData Authority: Department for Environment and Water
Data Provider: Department for Environment and Water

Description

DescriptionThis dataset represents the State Government's key extant native floristic vegetation mapping layer for SA. It provides floristic and structural information (referred to as vegetation types), and/or presence of native vegetation in South Australia. The data set includes floristic vegetation mapping datasets produced as part of the Biological Survey of SA program. This mapping is based on extrapolation of point based sampling and interpretation of imagery (aerial photography and/or satellite imagery). The descriptions for the vegetation types are stored in a textual database, the South Australian Vegetation Information System Database (SAVEG). The SAVEG database uses the National Vegetation Information System (NVIS) Framework.
UsageThis dataset is used to provide information on native floristic and structural vegetation mapping for SA. It should not be assumed that this dataset represents all extant native vegetation present in the State due to the limitations of the mapping methodology. For the purposes of this mapping the term native vegetation can include areas of remnant native vegetation along with areas of native regeneration that are present on the imagery at the time of mapping. Planted vegetation is generally not included in the mapping, however this can sometimes be difficult to distinguish from the surrounding native vegetation without further field inspection. Sources of error can occur in the extrapolation process and in the interpretation of the imagery. While some field checking is undertaken, it is not feasible to field check all mapping. This dataset has been translated into the NVIS vegetation attribute framework Version 6.0 (ESCAVI 2003), enabling integration with national projects.

Data Quality

LineageNative vegetation data has been captured using several data capture techniques, scales, sensitivities and using plant species information collected from different survey years. Generally the extent of native vegetation cover is mapped first based on the selected source imagery and field based vegetation survey information. The vegetation cover extent mapping is then edited to capture different vegetation types (floristic and structural differences) based on vegetation tones and textures interpreted by the individual vegetation mapper. Some contemporary veg mapping in the arid regions is based on the classification of Landsat imagery. The final vegetation types are recorded as coded mapping groups as polygon attributes. Pre-2004, floristic vegetation mapping for SA was undertaken on a region by region basis as a series of vegetation mapping projects with GIS outputs maintained as individual region-based datasets. However, since 2004, the region-based mapping has been consolidated into a single State-wide dataset. To implement this, all region-based SA floristic vegetation mapping layers were combined using a GIS 'update' technique. This process took the coarsest mapping first and progressively updated to the least coarse last to provide a single SA dataset. Region-based layers were added in the following order: Anangu Pitjantjatjara Lands, Nullarbor, Yellabinna, Yumbarra, Unnamed, Stony Desert, Tallaringa, North Olary, South Olary, Flinders, Coongie Lakes, Gawler Ranges, Northern Eyre, Mid North, Murray Mallee, Western Murray Flats, Southern Mount Lofty, Yorke Peninsula, South East, Kangaroo Island, Offshore Islands. No additional linework or attribute edge-matching was undertaken along boundaries as the datasets were brought together. Since 2004 new mapping has been captured directly into the State-wide layer, inc: Sandy & Pedirka Deserts, Mt Willoughby, River Murray Floodplain, Gawler Craton, Great Victoria Desert, Nullarbor, Far West EP, Cooper-Eromanga Basin.
CompletenessDataset is incomplete for the State in particular the Finke region, northern areas of the Gawler Craton, northern areas of the Mid-North and north-eastern Eyre Peninsula. The final dataset will be a complete State-wide layer indicating presence and type of native vegetation (no date has been established for dataset completion). Some types of native vegetation based on interpretation of imagery are difficult to observe. Hence these types of vegetation may be under-represented. For example there is some difficulty in interpreting presence/extent of native grasslands and low shrublands. Some narrow linear vegetation such as roadsides or creek lines may also have been missed. In the arid region of SA where no floristic mapping has been completed, assumed native vegetation cover has been added, excluding salt lakes greater than 50 hectares (salt lakes were defined from the Geoscience Australia's 1:250,000 water bodies layer, current to 2000). In the agricultural region vegetation is generally mapped to a minimum mapping unit of 1 hectare in size. Vegetation mapping polygons that have not been mapped with vegetation types (native vegetation cover only) will have NULL values for the SA_VEG_ID fields. Native vegetation mapping is generally based on the dominant overstorey distinguishable from the imagery. As a result the understorey may vary in floristic composition to what is described or in its condition (quality). In terms of condition, the understorey may vary from relatively pristine to moderately degraded to predominantly replaced by introduced plant species. In the agricultural region, there are some cases where areas of (high and medium density) scattered trees may have been mapped.
Positional AccuracyThe positional accuracy is dependent on the original source of the imagery and the capture process and, where applicable, artefacts of the imagery's rectification. This information is stored as attributes on the spatial data at the individual polygon level. All vegetation type boundaries represent an arbitrary line that is based on a subjective assessment of the best information available at the time of mapping. PLEASE NOTE: the vegetation mapping should not be used at scales beyond which it was captured and this scale is recorded against each polygon feature in the vegetation mapping data attribute table, refer to attributes in the 'MINSCALE' field of the polygon dataset.

Geographic Extent

Extent NameSouth Australia
Min Easting or Longitude129
Min Northing or Latitude-38.25
Max Easting or Longitude141
Max Northing or Latitude-26

Dataset Status

Initially Acquired30-JUN-2000
Last Updated09-AUG-2018
Update FrequencyAs required
Maintenance MethodThe layer is updated as new mapping projects are completed or when current mapping is significantly updated. Edge-matching between original mapping regions is done when time permits.
LicenseingCC BY (Attribution)

Attributes

TableNameField AliasData TypeDescription
Veg.SAVegetationFEATURECODE Long IntegerDEH adaption of Australian standard coding to identify landcover categories. All native vegetation is 6001. Regrowth is 6021, Native/Exotic Mix is 6100, Native/Pinus spp. mix is 6101.
Veg.SAVegetationSUBCODE short integerDEH adaption of Australian standard coding to identify land cover sub categories.
Veg.SAVegetationMAPUNIT Long IntegerMap Unit
Veg.SAVegetationSA_VEG_ID1 textDetailed floristic description code for first dominant vegetation group in polygon, if not applicable will be recorded as "NULL"
Veg.SAVegetationSA_VEG_ID2 textDetailed floristic description code for second dominant vegetation group in polygon, where applicable, if not applicable will be recorded as "NULL"
Veg.SAVegetationSA_VEG_ID3 textDetailed floristic description code for third dominant vegetation group in polygon, where applicable, if not applicable will be recorded as "NULL"
Veg.SAVegetationSA_VEG_ID1_PERCENT short integerProportion of first vegetation group in polygon, where it is unknown the data is recorded as "NULL" and where no vegetation type is identified it is zero.
Veg.SAVegetationSA_VEG_ID2_PERCENT BinaryProportion of second vegetation group in polygon, where it is unknown the data is recorded as "NULL" and where no vegetation type is identified it is zero.
Veg.SAVegetationSA_VEG_ID3_PERCENT BinaryProportion of third vegetation group in polygon, where it is unknown the data is recorded as "NULL" and where no vegetation type is identified it is zero.
Veg.SAVegetationGROUNDTRUTH BinaryEach feature is described with the accuracy of the data used to underpin the mapping. Usage of codes is limited as codes have evolved recently (since 1998). Survey Sites (SU) - DEH methodology; Ground Truth Site (GS) - methodology developed by DEH; Roadside vegetation survey (RV) - DEH methodology; Needs Checking (NC) - based on interpretation during mapping; Not Visited (NV), Ground Truth Trip (GT) - general field work undertaken; Unknown (UN); Field work for floristic mapping (FT) - undertaken with known list of mapping groups; Priority Check (PC) - highlighted that mapping was very unsure of what feature was from;Previous Floristic mapping (PM) - using other existing digital or hard copy mapping; Reserves Database (RD) - species list for reserves DEH data
Veg.SAVegetationSPATIAL_MIX textSPATIAL_MIX
Veg.SAVegetationSTATE CharacterCode to describe the state the data fall within. State borders are based on TOPO.SouthAust_arc dataset.
Veg.SAVegetationSACODES textSACODES
Veg.SAVegetationMU_250 short integerUnique regional vegetation description for first group, derived from original regional mapping projects and will not maintained during ongoing capture of data INTO Statewide layer
Veg.SAVegetationMU_250X short integerUnique regional vegetation description for second group, derived from original regional mapping projects and will not maintained during ongoing capture of data INTO Statewide layer
Veg.SAVegetationMU_250XX short integerUnique regional vegetation description for third group, derived from original regional mapping projects and will not maintained during ongoing capture of data INTO Statewide layer
Veg.SAVegetationMU_50 short integerUnique regional vegetation description for first group, derived from regional mapping projects and will not maintained during ongoing capture of data INTO Statewide layer
Veg.SAVegetationMU_50X short integerUnique regional vegetation description for second group, derived from original regional mapping projects and will not maintained during ongoing capture of data INTO Statewide layer
Veg.SAVegetationMU_50XX short integerUnique regional vegetation description for third group, derived from original regional mapping projects and will not maintained during ongoing capture of data INTO Statewide layer
Veg.SAVegetationPROJECT textDescription to identify project that defined vegetation groups and linework
Veg.SAVegetationDESCRIPTION textProject description
Veg.SAVegetationFEATURERELIABILITYDATE DateDate of the imagery used to delineate vegetation. In most cases where flight runs for imagery varied across a region the date is summarised to the most recent date.
Veg.SAVegetationATTRIBUTERELIABILITYDATE DateDate of the visit data used to define the vegetation. In most cases where site dates varied across a region the date is summarised to the most recent date.
Veg.SAVegetationHORIZONTALACCURACY DoubleThe horizontal accuracy of the capture of the features linework, based on relative accuracy scale of the data capture, broadly if 1:50,000 = 25; 1:100,000 = 50; 1:250,000 = 125 or the known accuracy of the orthorectified image.
Veg.SAVegetationVERTICALACCURACY DoubleThe vertical accuracy of the capture of the features linework, on the known accuracy of the orthorectified image.
Veg.SAVegetationCAPTURESOURCE Long IntegerAll data is 5 (Veg: Floristic Vegetation Mapping)
Veg.SAVegetationCAPTUREMETHOD short integerCode to describe method used to delineate feature, based on standard SDE domain. Trace - Registered Image (1) - mapping on screen from registered image, Trace - Ortho Image (2) - mapping on screen from orthorectified image, Table Digitisation (3) - mapping on to mylars using stereo or individual photos.
Veg.SAVegetationFEATURESOURCE short integerCode to describe the imagery used to delineate feature, based on coded domain. Valid descriptions (codes) currently used are: True Colour - Ortho Rectified - Aerial Photography (1), Satellite - TM Imagery (25), True Colour - Hard Copy - Aerial Photography (2), Infra Red - Ortho Rectified - Aerial Photography (4), Black&White - Hard Copy - Aerial Photography (9), Satellite Imagery (10)
Veg.SAVegetationMINSCALE Long IntegerDescribes the scale at which the linework was captured from the imagery. For hard copy imagery this is the original scale of the image. For digital images this is the scale that was zoomed in to. (However for River Murray this is the scale of the image while maxscale represents the capture scale of the linework.)
Veg.SAVegetationMAXSCALE Long IntegerDescribes the scale of the data used to obtain relative accuracy for the mapping, such as roads, drainage, contours of topographic data or the scale of the image. (However for River Murray this is the scale of the capture of the linework while maxscale represents the scale of the image)
Veg.SAVegetationEDITDATE DateDate of editing date of capture of linework or attribution of the feature in ArcGIS.
Veg.SAVegetationDATA_SET_ID Long IntegerDataset ID
Veg.SAVegetationCONDITION textCode to describe the conditon of the mapped feature, such as weedy understorey, grazing, surface disturbance. This data has not been field checked in most cases is based on interpretation from imagery. Most mapping was coded with unknown (UN). So completeness is based on the extent of use of other codes.
Veg.SAVegetationCOMMENTS textComments about vegetation
Veg.SAVegetationUNDERSTOREY short integerUnderstory
Veg.SAVegetation_SA_LUTSA_VEG_ID textVegetation group code - links to SA_VEG_ID1, SA_VEG_ID2 and SA_VEG_ID3
Veg.SAVegetation_SA_LUTGENFORMDESC textBroad structural formation description based on NVIS structural table and amalgamating of types. (Field Alias is VG_GEN_FOR)
Veg.SAVegetation_SA_LUTFORMDESC_NVIS textStructural formation description - based on NVIS table, not SA Structural Formation Table (Field Alias VEG_STR_FOR)
Veg.SAVegetation_SA_LUTBROAD_VEGDESC textBroad description for the State - most common genera (eg Acacia, Melaleuca) with a broad structural formation description (Field Alias is BROAD_VEGD)
Veg.SAVegetation_SA_LUTDOMSPECIES_STRATUM textDominant or co-dominant species of the dominant stratum, with a broad structural formation description. Mixed refers to the indication that dominant species listed is really the first and the group is a bit of a mix of more than 2 co-dominant species. (Field Alias is DOMSP_GENST)
Veg.SAVegetation_SA_LUTDOMINANT_STRATUM textDetails of the dominant layer of the vegetation group - includes all species and structure for the layer. (Field Alias is DETSP_DOM)
Veg.SAVegetation_SA_LUTALLIANCE textDominant species with broad structural formation description with other non-dominant stratum included only by the structural or dominant growth form information.
Veg.SAVegetation_SA_LUTDOMSPECIES_LAYER textDominant or co-dominant species of each layer (upper tree, middle shrub, ground) with broad structural formation description (Field Alias is DOMSP_LAY)
Veg.SAVegetation_SA_LUTSAVEG_DESCRIPTION textFull description for the vegetation group - includes all species in all layers with structural information for each layer. Where no height or cover information is available to define a structural formation description the dominant growth form of the layer is provided.
Veg.SAVegetation_SA_LUTENVIRON_DESCRIPTION textEnvironmental descriptions for the group summarised from survey site data or knowledge of the group with soils, landforms and other topographic and locational information
Veg.SAVegetation_SA_LUTVEG_ID DateVEG_ID
Veg.SAVegetation_SA_LUTMVG_NO short integerUnique number for Major Vegetation Group
Veg.SAVegetation_SA_LUTMVS_NO short integerUnique number for Major Vegetation Sub-Group
Veg.SAVegetation_SA_LUTMVG_NAME textDescription of Major Vegetation Group, which has been created and defined to a group through the collaboration of the national data to created Australia wide products.
Veg.SAVegetation_SA_LUTMVS_NAME textMajor Vegetation Sub-Group description, which has been created and defined to a group through the collaboration of the national data to created Australia wide products.

Contact Information

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

ADELAIDE
5001
EmailDEWNR.CustomerServiceCentre@sa.gov.au