MetaShare PROD
Upper Barwon River DEM Diff
dataset
Dataset: Upper Barwon River DEM Diff
Assembly: Single
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Citation proposal Citation proposal
Upper Barwon River DEM Diff Department of Transport and Planning https://metashare.maps.vic.gov.au/geonetwork/srv/eng/catalog.search#/metadata/341d693d-bf55-5511-b354-1eadba9b33c8 |
- Description
- Temporal
- Spatial
- Maintenance
- Format
- Contacts
- Keywords
- Resource Constraints
- Lineage
- Metadata Constraints
- Quality
Description
- Title
- Upper Barwon River DEM Diff
- Resource Type
- Dataset
Temporal
Spatial
- Spatial representation type
- Grid
- Horizontal Accuracy
- 0.3m
- Code
- MGA Zone 54 GDA2020
Maintenance
Format
- Title
- ESRI Ascii
Contacts
Point of contact
Department of Transport and Planning
-
Coordinated Imagery Program
PO Box 500
East Melbourne
Victoria
3002
Australia
Keywords
- Topic category
-
- Elevation
Resource Constraints
- Use limitation
- General
- Classification
- Unclassified
Lineage
- Description
- DEM difference analysis was conducted on a per-river basis. The Difference DEM was generated by subtracting the existing 2009-10 DEM surface from the new DEM surface. This required the transformation of the 2009 data from GDA94 to GDA2020. The level of the old surface was vertically adjusted (co-registered) to the level of the new surface by comparing heights at selected sites representing unchanged areas. At least three unchanged co-registration sites per river were used.
Metadata Constraints
- Classification
- Unclassified
Quality
Attribute Quality
Positional Accuracy
Conceptual Consistency
- Comments
- The desired level of co-registration (at the 3 co-registration sites) was specified as 0.1m. Despite achieving this level of co-registration, there can be variability in the level of surface co-registration across the broader river AOI. Surface co-registration variability will manifest in the DEM difference product as areas of changed surface level. There are several possible underlying reasons for differences in the DEM surface including innacuracies in either of the source DEMs or real surface change. Each river Difference DEM needs to be assessed at the local site level to ascertain whether surface differences are real, an artefact of either source dataset or the result of a problem with the co-registration process.
Missing Data
- Comments
- Complete for river AOI.
Excess Data
Overviews
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341d693d-bf55-5511-b354-1eadba9b33c8
Access to the portal Access to the portal
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Associated resources
Not available