Victorian Wetland Environments and Extent - up to 1994
dataset:
WETLAND_1994
Polygons showing the extent and types of wetlands in Victoria based on photography taken during the 1970's and 80's. Wetlands are classified into primary categories based on water regimes and subdivided into sub areas based on vegetation or hydologic attributes.
The polygon boundaries were derived from digitizing marked up aerial photography interpretation.
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Citation proposal Citation proposal
(2013) Victorian Wetland Environments and Extent - up to 1994 Department of Energy, Environment, and Climate Action https://metashare.maps.vic.gov.au/geonetwork/srv/eng/catalog.search#/metadata/09e898ef-aea1-57df-baa6-9e39f98cdd9b |
Details
Contacts
Cited responsible party
No information provided.
Cited responsible party
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Cited responsible party
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Cited responsible party
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Cited responsible party
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Point of contact
Department of Energy, Environment, and Climate Action
-
Biodiversity Info
(Biodiversity Info)
PO Box 500
East Melbourne
Vic
3002
Australia
Identifiers and Keywords
- ANZLIC Id
- ANZVI0803001066
- Victorian Spatial Data Library (VSDL) Schema
- FLORAFAUNA1:WETLAND_1994
- Jurisdiction
- Victoria
- Topic category
-
- Inland waters
Resource Constraints
- Use limitation
- Data is available under licence. Access subject to custodial approval
- Classification
- Unclassified
- Creative Commons Attribution 4.0 (CC-BY)
Other Dataset Details
- Date ( Revision )
- 2013-05-13
- Date ( Publication )
- 2018-02-01T17:11:45
- Status
- Completed
- Purpose
- WETLAND_1994 is one of two layers designed to document changes over time in the nature and extent of wetland environments in Victoria. This layer is directly related to WETLAND_1788 via the use of a common wetland identification system. It is a more complex layer than WETLAND_1788 in that there is delineation of sub areas within wetlands.
- Credit
- Andrew Corrick
- Supplemental Information
- Relationship to other Datasets: As stated above, this layer is closely related to WETLAND_1788 and should be maintained in a way which ensures consistency between them in the use of identifiers and classification codes. Comparisons of this layer with HYDRO100 and HYDROP100 should be made with caution as the definitions used in delineating and classifying wetlands are likely to be significantly different in some cases. Current Design Issues: Although the only attributes held within this layer are an identifier and a wetland category/sub- category, there are several external tables in existence keyed on the same identifier. These include tables documenting RAMSAR wetlands, High Value wetlands, named wetlands and wetlands supporting breeding colonies of waterbirds. The wetland category field consists of a primary category and a subcategory separated by a period. The subcategories are not consistent between primary categories (eg: a redgum dominated sub area of a shallow marsh is coded 3.05 whilst the same subcategory in a meadow is coded 2.03 - not 2.05). This has not been changed because if it was it would make reconciliation of layer codes with the source material very difficult. Instead tables have been created which map real category codes to alternate codes which can be used consistently between primary categories (refer normcats.lut and gencats.lut). Future Design Issues: It is envisaged that additional external tables will be defined which group wetlands in additional ways according to specific attributes (eg: membership of large scale wetland systems). Further attributes may also be added to existing tables, but none of this work should require any change to the structure of the library layer. Related Documents: None
- Maintenance and update frequency
- Not planned
- Maintenance date ( Publication )
- 2018-02-01T17:11:45
Spatial
- Spatial representation type
- Vector
- Description
- General - Victoria
- Reference system identifier
- 4283
N
S
E
W
Temporal
- Begin date
- 1965-01-01
- End date
- 1994-01-01
Resolution
- Horizontal Accuracy
- 25m
Quality
- Conceptual Consistency
- The Wetland Mapping System includes processes for checking: *node, label and intersect errors. *validation of category codes prior to insertion in the library.
- Missing Data
- All wetlands with an area of 1 hectare or more should be present. All wetlands with an area of 1 hectare or more should be present.
- Attribute Quality
- The classification scheme used is based on photo interpretation and ground surveys carried out by Departmental research staff under the direction of research scientist Andrew Corrick.
- Positional Accuracy
- Precision: 10m to 100m Determination: Deductive estimate. Ad-hoc comparisons with 1:25,000 layer data and various sorts of imagery indicated good correlation in terms of shape and size but with errors of the order indicated above in terms of position and/or rotation. When resources permit, the 1:25,000 library hydrology and roads layers should be used to identify layer inconsistencies which may indicate specific wetlands which require translation, rotation or boundary modifications.
Lineage
- Description
- The data has been inserted into covers based on 1:100,000 mapsheet tiles via one or more of four processes: * Pre ARC/INFO data: Prior to the availability of ARC/INFO, an in-house developed digitizing program known as DIGIT running on a PDP11 computer at ARI was used. The marked aerial photography was positioned on a digitizer using two reference points corresponding to six figure grid references. These points defined the orientation and scale of the photograph. The arcs defining wetlands on the photograph were then digitized. The coordinates generated were then converted to be expressed as values relative to the grid reference used as the wetland ID and stored on disk for subsequent plotting. This existing digital linework and associated attribute data was subsequently imported into ARC/INFO via the use a FORTRAN based conversion utility which created GENERATE input files. Further errror checking and editing processes were then applied to bring data from this source up to a comparable standard to data entered directly into ARC/INFO. * Direct digitizing from aerial photography: A facility is provided in the Wetlands Mapping System to digitize data directly from aerial photographs. This facility uses the ARC/INFO photo registration process which requires a minimum of five tic points to be defined. This process is used for editing or adding individual wetlands. * Digitizing from 1:25,000 survey map overlays: Some 1:100,000 mapsheets have been processed by digitizing in ARC/INFO using marked up transparent overlays of 1:25,000 mapsheets. * Scanning of 1:25,000 survey map overlays: On more complex mapsheets the marked up overlays have been scanned into SCITEX format files. These files have then been converted into ARC/INFO GENERATE input files and imported into ARC/INFO for final editing and adding of attributes.
- Statement
- Dataset Source: The data has been prepared primarily from standard Survey and Mapping Victoria photo runs with some local revisions based on other historical sources. Dataset Originality: Primary
Attributes
-
Column Name Obligation Unique Data Type Data Length Data Precision Data Scale Reference Table Owner Reference Table Name Reference Table Code Column Name Short Column Name Definition ALT_NAME O N VARCHAR2 50 ALT_NAME MAIN_NAME O N VARCHAR2 50 MAIN_NAME MAPSHEET O N NUMBER 22 4 0 MAPSHEET 1:100000 mapsheet number. This must correspond to the tile name. HECTARES O N NUMBER 22 18 2 HECTARES Area of feature in hectares AREASQM O N NUMBER 22 18 2 AREASQM Area of feature in square metres CATEGORY O N NUMBER 22 4 2 CATEGORY Code describing the wetland category and sub-category. Use the CATCODE field in the NORMCATS.LUT table to obtain a consistent subcategory classification across all primary categories or CATCODE in the GENCATS.LUT table to shade by primary category. SEARCH O N VARCHAR2 90 SEARCH WETLAND O N NUMBER 22 6 0 WETLAND A 6 figure AMG grid reference ie. 3 Eastings followed by 3 Northings. See the PAT for further details. X_CATEGORY O N VARCHAR2 15 X_CATEGORY POLYFLAG O N NUMBER 22 1 0 POLYFLAG POLYFLAG is used to reselect label points, so that in multi polygon wetlands, only one polygon is used for labelling. When POLYFLAG is set to 9 it is used for labelling. X_SUBCATEGORY O N VARCHAR2 20 XSUBCAT
About the Metadata Record
- Metadata identifier
- 09e898ef-aea1-57df-baa6-9e39f98cdd9b
Contact
No information provided.
- Resource Type
- Dataset
- Date info ( Revision )
- 2013-05-13
- Standard Name
- ISO 19115-3:2018
- Profile Name
- DELWP Profile
- Profile Version
- Version 1
- Profile Date
- 2019-05-24
Metadata Constraints
- Classification
- Unclassified
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09e898ef-aea1-57df-baa6-9e39f98cdd9b
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