Wimmera CMA - Difference DTM

dataset
Dataset: Wimmera CMA - Difference DTM Assembly: Single
 
Citation proposal Citation proposal

Wimmera CMA - Difference DTM

Department of Transport and Planning

Description

Title
Wimmera CMA - Difference DTM 
 
 

Temporal

Time period
2019-02-102019-02-14 
 
 

Spatial

Horizontal Accuracy
0.3m 
Vertical Accuracy
0.2m 
Code
MGA Zone 54 GDA2020 
 
 

Format

Title
ESRI Ascii 
 
 

Contacts

  Point of contact

  Custodian

 
 

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 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
 
 

Acquisition Info

Platform Type
Aerial 
Assembly
Single 
Tile Size
1 km 
 
 

Raster Data Details

Raster Type
Difference Raster 
X Pixel Resolution (cm)
1cm 
Y Pixel Resolution (cm)
1cm 
Seamlessness
Not Entered 
Number of Bands
0 
Band List
Not Entered 
Resampling Kernel
Not Entered 
Rectification Type
Not Entered 
Platform Name
Not Entered 
 
 

Survey Details

Sensor

Title
Not Entered 
Identifier
Not Entered

Type
Not Entered 
 

Aerial Survey Details

Run Orientation
Not Entered 
Flying Height Unit
Not Entered 
 
 


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