MetaShare PROD
Mallee CMA - Difference DTM
dataset
Dataset: Mallee CMA - Difference DTM
Assembly: Single
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Citation proposal Citation proposal
Mallee CMA - Difference DTM Department of Transport and Planning https://metashare.maps.vic.gov.au/geonetwork/srv/eng/catalog.search#/metadata/26e7b82d-0125-5515-81f4-ff6295dd10d4 |
- Description
- Temporal
- Spatial
- Maintenance
- Format
- Contacts
- Keywords
- Resource Constraints
- Lineage
- Metadata Constraints
- Quality
Description
- Title
- Mallee CMA - Difference DTM
- 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
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Coordinated Imagery Program
PO Box 500
East Melbourne
Victoria
3002
Australia
Keywords
- Topic category
-
- Elevation
Resource Constraints
- Use limitation
- General
- Classification
- Unclassified
Lineage
- Description
- DTM difference analysis was conducted on a per-river basis. The Difference DTM was generated by subtracting the existing 2009-10 DTM surface from the new DTM 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 DTM difference product as areas of changed surface level. There are several possible underlying reasons for differences in the DTM surface including innacuracies in either of the source DTMs or real surface change. Each river Difference DTM 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 the common area of both river AOIs.
Excess Data
Overviews
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Views Views
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Access to the portal Access to the portal
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Associated resources
Not available