Title

Hydrographic Labels - Vicmap Features of Interest 

Alternate title

GEO_AREA_HYDRO_LABEL 

Purpose

Geographic Areas, which depict such features as seas, bays, ranges, plains and islands, are sourced from annotation layers and hence have limitations in the way they can be used. The purpose of this project was to capture polygons representing these areas for the purposes of map labelling. These polygons would contain intelligent information including name, feature type and level, enabling flexible, intelligent and cartographic labelling which is both multi scale and non scale dependent. The Geographic Areas data set can be used for all Vicmap Topographic outputs, at any scale and using index or non-index generation processes and hence meets the "one source many outputs" philosophy of Vicmap Topographic mapping. Current products utilizing geographic areas are: " Vicmap Topographic Hardcopy Mapping Program Vicmap Topographic 1:25 000 Vicmap Topographic 1:25 000 GeoReferenced " Vicmap Topographic 1:30 000 online " Vicmap Topographic 1:50 000 Vicmap Topographic 1:50 000 GeoReferenced " Vicmap Topographic mapping by centroid Vicmap Topographic 1:100 000 Vicmap Topographic 1:100 000 GeoRef Geographic areas can also be used for other mapping products outside of Vicmap Topographic. The scale range of use from 1: 5 000 to 1: 10 000 000, statewide and seamless coverage and dynamic labelling capabilities make it ideal for web mapping systems such as Information Services Branch's land Channel and DSE's Mapshare. Any customized mapping project within Information Services Branch, DSE and whole of Victorian Government should gain benefits from using this dataset. Potential duplication of effort will be removed and it will ensure a consistency of information across all map output products. 

Credit

Project Instigator: George Mifsud Data Capture: Lisa Cheong Data updates: Samuel Hislop, Kathryn Germain, Richard Stewart 

Supplemental Information

Related Documents: None Please see Vicmap Features of Interest product description for more detailed information on this product. This can be found on the Vicmap Features of Interest webpage. http://www.delwp.vic.gov.au/vicmap > Vicmap Products > Vicmap Features of Interest http://www.delwp.vic.gov.au/vicmap 

Status

Obsolete  

Horizontal Accuracy

25m  

Maintenance and update frequency

As needed  

Title

SDE 10 

Topic category

• Elevation
• Environment
• Geoscientific information

Use limitation

OBSOLETE dataset replaced by VMYDRO.HY_WATER_AREA_FUZZY. To be used for labelling only. Not to be used for GIS analaysis, spatial modelling or area statements 

Classification

Restricted  

Statement

Dataset Source: Geographic Areas Hydro Label is sourced from the original published 1:25 000 topographic maps sheets produced from 1975 to 1995. An additional source was the Geographic names Register. As part of the conversion to digital data process in the 1990s, each 1:25 000 map sheet was scanned. The relief and hydrographic area map textual information was incorporated as annotation as part of the SDMB-T (State Digital Map Base - Topographic) layers MORPTH25 and SHORE25 respectively. Note that this information was created specifically for use at 1:25 000 and was dependent on the 1:25 000 index system There is no Vicmap dataset that contains spatial information depicting geographic areas. So to display this information for Vicmap Topographic purposes the SDMB_T annotation layers were used. This posed some limitations in its use. For instance the annotation for the text 'PORT PHILLIP BAY" was created over the extent of the feature for every single format 1:25 000 map where the feature occurred. Hence over a Vicmap Topographic 1:25 000 mapsheet, which is two single format sheets side by side, this textual information would potentially be displayed twice. This same annotation may be truncated on the edges of Vicmap Topographic 1:30 000 A4 map sheets (see fig 1.) On the Vicmap Topographic 1:50 000 map sheets the annotation may not be readable due to its reduced size, and may appear several times in the map area. Dataset Originality: Primary & Derived 

Description

Collection Method: Screen digitized using coastline and SHORE25 

Description

Hydrographic areas were identified on compilation maps displaying SHORE25 annotation. Individual polygons were then screen digitized for each appropriate annotated feature. The name, feature type code, land type and level properties were populated for each new polygon. The boundary was determined by the coastline on the landward side and a concave arc out to sea on the seaward side intersecting with the coast at a logical point, usually at the tip of a headland. For mapping and display purposes each polygon would be labelled with the name of the feature. The boundary line would not shown. 

Classification

Unclassified  

Attribute Quality

Comments

90% 

Positional Accuracy

Comments

Not valid due to fuzzy nature of polygons 

Conceptual Consistency

Comments

Due to the nature of the data, this data set may contain: overlapping polygons intersecting linework polygons with no labels 

Missing Data

Comments

State Wide Completeness Verification: State wide QA process 

Excess Data

Comments

80% classification accuracy