Geelong - Anakie - Golden Plains - DEM

dataset
Dataset: Geelong - Anakie - Golden Plains - DEM Assembly: Single
 
Citation proposal Citation proposal

Geelong - Anakie - Golden Plains - DEM

Department of Transport and Planning

Description

Title
Geelong - Anakie - Golden Plains - DEM 
 
 

Temporal

Time period
2014-02-272014-03-04 
 
 

Spatial

Vertical Accuracy
0.1m 
Code
MGA Zone 55 GDA94 
 
 

Format

Title
ESRI Ascii 
 
 

Contacts

  Point of contact

  Custodian

 
 

Keywords

Topic category
  • Elevation
 
 

Resource constraints

Use limitation
General 
Classification
Unclassified 
 
 

Lineage

Description
+/- 10cm vertical accuracy LiDAR derived DTM products were produced from the LiDAR data. The project also includes the supply of merged DTM tiles with surrounding, existing, LiDAR DTMs from previous DEPI projects. ESRI ASCII Grids were derived using the Natural Neighbor interpolation. This method uses the closest triangles and applies weights to the proportionate areas from the grid cell centroid to interpolate the value. It uses known elevation data, it does not make any predictions regarding the surface and accurately depicts existing troughs and peaks in the data and supports irregular point spacing, which suits the nature LiDAR data. LEVELLING AND MERGING OF NEW AND EXISTING DTMS Comparisons and adjustments were undertaken on LiDAR point LAS data to produce a seamless dataset for DTM generation. This process used a 50m overlap between the datasets to be merged together. The DTM was generated with 2km buffer of LIDAR point LAS data around the tiles that contained the join to ensure the data would be contiguous with the current and previous datasets. Comparison by volumetric computation were undertaken to compare the data from the Geelong North - Anakie survey to previous projects which overlap the current project. These projects were 2009-10 North West LiDAR Augmentation Project, 2011-12 Melbourne & Surrounds Forest Structure LiDAR project and 2011-12 Floodplains LiDAR Stage 2 ¿ Corangamite. Ground data in this volume was compared to 25 test areas of DTM within the area of overlap with the adjacent projects. The test areas were distributed across the overlap of the project areas and located on open clear ground. The Geelong North and Anakie project data was adjusted by -0.05m. The LiDAR point LAS data was reclassified within the 50 m overlap area to produce a seamlessground surface classification. The DTM was generated with 2 km buffer of LIDAR point LAS data around the tiles that contained the join to ensure the data would be contiguous. 
 
 

Metadata Constraints Metadata Constraints

Classification
Unclassified 
 
 

Quality

Attribute Quality
Positional Accuracy
Conceptual Consistency
Missing Data
Excess Data
 
 

Acquisition Info

Platform Type
Aerial 
Assembly
Single 
Tile Size
2 km 
 
 

Raster Data Details

Raster Type
DEM 
X Pixel Resolution (cm)
1cm 
Y Pixel Resolution (cm)
1cm 
Seamlessness
Full 
Number of Bands
0 
Band List
1 
Resampling Kernel
Nearest Neighbour 
Rectification Type
Orthorectified 
Platform Name
Fixed Wing Aircraft 
 
 

Raster Type Details

DEM Creator
Supplier 
 
 

Survey Details

Sensor

Title
Unknown 
Identifier
Aerial

Type
LIDAR 
 

Aerial Survey Details

Runs
84 
Run Orientation
E-W 
Swath Width
748 
Side Overlap
25 
Flying Height Unit
agl metre 
Flight Height
1030 
 
 


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