Victorian Spatial Data Directory

Water Structure Area (polygon) 1:25,000 - Vicmap Hydro (HY_WATER_STRUCT_AREA_POLYGON/)

Unique Id

ANZVI0803002498

Custodian

Department of Sustainability and Environments

Jurisdiction

Victoria

Description

Abstract

This layer is part of Vicmap Hydro and contains polygons delineating structural features relating to hydrography.
Includes; Dam Batters and Spillways
Also available in line/centroid layers.

Search Word(s)

AGRICULTURE Irrigation
LAND Topography
WATER Hydrology

Geographic Extent Name(s)

Victoria

Bounding Box

34.0 S

141.0 E

150.2 E

39.2 S

Dataset Currency

Beginning Date

01JAN1974

Ending Date

01JAN1995

Dataset Status

Progress

Complete

Maintenance and Update

Irregular

Dataset Access

Stored Data Format(s)

- SDE

Available Format Type(s)

Digital - - All major formats available

Access Constraints

Not Documented

Data Quality

Lineage

Data Set Source:
The line work and points were derived from the Vicmap Digital Topographic (VDT) map base coordinated by LIG.
VDT evolved from Victoria's printed 1:25,000 Topographic Map Series program together with the need to supply a control framework for the creation of the rural Digital Cadastral Mapbase. The capture scale is 1:25,000 Statewide and the coverage, except for minor border issues is also statewide.
Collection Method:
Conversion of existing mapping, digital stereo capture
Processing Steps:
- Conversion of existing mapping - compilation conversion 30% and repromat conversion 50%
- digital stereo capture - 20%
-The majority of the conversion of existing mapping and approximately 30% of the digital stereo capture were outsourced to private contractors and the remainder was captured in house. Contractor's primarily scanned and vectorised existing repromat with a small amount of hand digitising done in some instances.

Positional Accuracy

The planimetric accuracy attainable will be the sum of errors from three sources:the positional accuracy of the source material, errors due to the conversion process, errors due to the manipulation process. For topographic base derived data this represents an error of 8.3m on the ground for 1:25,000 data. A conservative estimate of 10m for the standard deviation will be used in any data quality information. Alternate and equal ways of expressing this error are: not more than 10% of well-defined points will be in error by more than 16 m. The worst case error for the data is +/- 30 m. For vertical positional accuracy of points determined from contours there is an expectation that the elevation accuracy (standard deviation) will be half the value of the contour interval.

Attribute Accuracy

The allowable error in attribute accuracy ranges between a 1% allowable error to 5% error. For this product attribute accuracy ranges between a 1% to 5% error. For this product attribute accuracy is a measure of the degree to which features and attribute values of spatial objects agree with the information on the source material.

Logical Consistency

The allowable error in attribute accuracy ranges between 1% to 5% error. Logical consistency is a measure of the degree to which data complies with the technical specification. The test procedures are a mixture of scripts, microstation MGE program and on-screen visual checks.

Completeness

Contact

Contact Organisation

Department of Sustainability and Environments

Contact Position

Custodian - Vicmap Hydro

Address

PO Box 500

East Melbourne VIC 3002

Australia

Phone

(03) 8636 2354

Facsimile

(03) 8636 2394

Email Address

darren.mckinty@dse.vic.gov.au

Other

Metadata Date

05JUL2006

Additional Metadata