This page hopes to unlock the mysteries surrounding the Queensland wetlands-themed datasets available from http://data.australia.gov.au/.
morb_au is currently playing around with them.
- 1 Provenance
- 2 Available CC-BY Layers
The provenance of the wetlands datasets is the State of Queensland, Department of Environment and Resource Management (formerly known as the Environmental Protection Agency).
The dataset is quite large (in the order of 1GB when converted to PostGIS, and believe me when you wait 30 seconds for a rendering from the native ESRI shapefile, you will beg to know how to convert it to PostGIS). In order to understand the attributes of the dataset, you should first peruse the documentation available from the EPA/DERM website:
Wetland Mapping and Classification Methodology
Wetland Mapping and Classification Methodology, Overall Framework, A Method to Provide Baseline Mapping and Classification for Wetlands in Queensland, Version 1.2
Wetland Mapping and Classification (Fact Sheet)
"The Queensland Mapping and Classiication project will deliver comprehensive maps of Queensland’s wetlands—at a scale and level of detail that will help wetland managers to make accurate decisions about the protection and care of wetlands. It is also part of a larger project involving the development of a wetlands inventory database."
Queensland Wetlands Programme, (FAQ)
Queensland Wetlands Programme, Frequently Asked Questions about wetland mapping in Queensland
Regional Ecosystem Description Database
"The Regional Ecosystem Description Database (REDD) can be downloaded for your use. It is provided in two formats, MS Access and HTML."
The EPA/DERM have a set of pre-rendered wetlands maps available as PDF from its website (http://www.epa.qld.gov.au/wetlandinfo/site/MappingFandD/WetlandMapsAndData/PDFMaps.html). You can use these maps as a reference rendering, in order to compare your own renderer's output to that of EPA/DERM.
Here's an example that has a little of most wetland types, from Deception Bay through to Lake Wivenhoe: http://www.wetlandinfo.com.au/resources/pdf/maps/Wetlands56_CABOOLTURE.pdf (5.7MB)
Available CC-BY Layers
Queensland Wetlands Data – Wetlands
- Original dataset home page: http://data.australia.gov.au/119
Mapping of water bodies and wetland regional ecosystems at 1:100,000 scale across Queensland.
- Metadata reference: http://atlas.information.qld.gov.au/atlas/WetlandMaps/metadata/QLD_WETLAND_MAP_SYSTEM.xml
The metadata for this dataset does not appear to explain what the feature codes mean. morb_au has discovered the classification page at http://www.epa.qld.gov.au/wetlandinfo/site/WetlandDefinitionstart/WetlandDefinitions.html which may be of assistance.
Essentially this dataset appears to be the union of several feature classes, therefore only a subset of attributes having meaning for a given feature class, the remainder appearing to be null or blank.
The feature classes appear to be:
- Drainage Basins
- Wetland Regional Ecosystems
Each feature class seems to override the presence of one before it, e.g. a waterbody is in a drainage basin, but if you click on a waterbody in a GIS (like QGIS), the waterbody area is excised from the drainage basin area. You don't get details returned for both.
The following is an attempted reconstruction of what each attribute means.
For casual mappers, the legend attribute appears to be the most useful one (along with the feature geometry, of course).
|Attribute||Applies to Class||Presumed Description||Source||Source Section|
|wetland_id||Wetland||Wetland primary key||n/a||n/a|
|wetclass||Wetland|| Wetland Class:
|wetclass_l||"||Long (or Lookup-Table) version of the above||"||"|
|hydromod||TBA|| Hydrological Modification:
H1=Natural wetland (no modifications observed)
H2M1=Dams or weirs within Riverine channels
H2M2=Lakes or swamps where size and/or hydrology altered, e.g. by construction of levee banks or deepening
H2M2p=Lakes or swamps dominated by exotic pasture species where size and/or hydrology altered by construction of levee banks (usually from estuarine to freshwater)
H2M3=Lakes or swamps where salinity classification changed by banks or bunding from estuarine/marine to freshwater
H2M3p=Ponded pastures (hydrology changed from estuarine to freshwater, dominated by exotic pasture species)
H2M4=Modified springs - damaged
H2M4a=Modified springs - dormant
H2M5=Wetlands damaged by mechanical disturbance, e.g. cropping
H2M6=Wetlands completely converted to a ring tank or other controlled storage
H2M7=Riverine or Estuarine water bodies mostly converted to constructed waterways such as canals or irrigation channels, usually by earthworks to bed and/or banks
H3C1=Artificial stand-alone water storage not in a natural water body or channel
H3C2=Artificial channel (drain/canal)
H3C3=Modified floodplain water bodies)
|hydromod_l||"||Long (or Lookup-Table) version of the above||"||"|
|salinmod||TBA|| Salinity Modifier:
|salinmod_l||"||Long (or Lookup-Table) version of the above||"||"|
01-50_RE = ?
51-80_RE = ?
E_RE = Estuarine Regional Ecosystem
E_WB = Estuarine Waterbody
L_RE = Lacustrine Regional Ecosystem
L_WB = Lacustrine Waterbody
M_WB = Marine Waterbody
P_RE = Palustrine Regional Ecosystem
P_WB = Palustrine Waterbody
R_RE = Riverine Regional Ecosystem
R_WB = Riverine Waterbody
For reference, here is an example schema that is produced if you use ogr2ogr to convert from shapefile to PostgreSQL:
CREATE TABLE qld_wetlands ( ogc_fid serial NOT NULL, wkb_geometry geometry, wetland_id numeric(10), wetland_ar numeric(19,8), wetclass character(12), wetclassid numeric(1), hydromod character(12), salinmod character(12), wetre character(80), floodplain character(2), wetrepct character(40), wtrregime character(4), source character(8), remcover character(4), wetsub character(12), xre character(50), xre_percen character(14), xre_class character(32), drainagedi character(20), catchment character(24), habitat_id numeric(10), habitat_ar numeric(19,8), legend character(12), wetclass_l character(16), hydromod_l character(64), salinmod_l character(16), floodpla_1 character(40), wtrregime_ character(40), shape_area numeric(19,11), shape_len numeric(19,11), shape_ar_1 numeric(19,11), shape_le_1 numeric(19,11), shape_fid numeric(9), CONSTRAINT enforce_geotype_wkb_geometry CHECK (geometrytype(wkb_geometry) = 'POLYGON'::text OR wkb_geometry IS NULL), CONSTRAINT enforce_srid_wkb_geometry CHECK (srid(wkb_geometry) = 4283) )
Queensland Wetlands Mapping – Streams
This dataset provides mapping of water bodies and wetland regional ecosystems at 1:100,000 scale across Queensland.
NOTE: As of 10 October 2009, this dataset download appears to be defective. There is no shapefile in the Zip archive.