castlemaine_2022jan21_dem1m_v10cm_epsg7855
dataset
Dataset: castlemaine_2022jan21_dem1m_v10cm_epsg7855
Assembly: Single
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Citation proposal Citation proposal
castlemaine_2022jan21_dem1m_v10cm_epsg7855 Department of Transport and Planning https://metashare.maps.vic.gov.au/geonetwork/srv/eng/catalog.search#/metadata/984881aa-ceb1-5484-a8eb-537bf8490b02 |
- Description
- Temporal
- Spatial
- Maintenance
- Format
- Contacts
- Keywords
- Resource Constraints
- Lineage
- Metadata Constraints
- Quality
- Acquisition Info
- Raster Data Details
- Raster Type Details
- Point Cloud Data Details
- Contour Data Details
- Survey Details
Simple
Description
- Title
- castlemaine_2022jan21_dem1m_v10cm_epsg7855
Temporal
- Time period
- 2022-02-162022-02-25
Spatial
- Code
- MGA Zone 55 GDA2020
Maintenance
Format
- Title
- TIFF
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
- Digital Elevation Model (DEM) - The DEM was generated from the point cloud (class 2 - Ground). Terrain Grids were derived using LasTools las2dem. This software reads LIDAR points from the LAS/LAZformat, triangulates them temporarily into a TIN, and then rasterises the TIN onto a DEM. Standard linear interpolation is used. Bridge Removal – bridges have been classified and excluded from DEM generation. Additional synthetic points were collected to support the DEM shape when bridges and culverts were removed. These points have only been introduced into the DEM processing, to avoid triangulation across the bridge or culvert. Hydro-flattening was undertaken as per DELWP guidelines. Hydro-flattening features are drawn manually to define the following: Non-tidal water bodies with surface area greater than 625m2 Non-tidal water courses greater than 30m nominal width are hydroflattened as appropriate for the gradient of the river. Braided rivers with shingle beds are treated as ground. Tidal variation – AAM recommend clipping/masking coastal water from the DEM, while retaining all valid offshore rocks and islands. This gives a clean presentation around the coastline and includes all valid ground data. Areas outside the coastal boundary have "no data” value applied to the full tile extents. Hydro Features are drawn with reference to the point cloud and intensity images to define water boundaries and ocean clipping boundaries for tidal water areas. These are used to generate points to fill the water bodies with height extracted from the lowest surrounding ground points. For sloping rivers, a manual approach is required to define cross-sections of river where the gradient changes to apply sloping heights accordingly. Ground classified points, hydro-flattening points and synthetic points for bridge and culvert removal are combined to form the input data for DEM generation using Point to TIN, and TIN to Raster Natural Neighbour interpolation.
Metadata Constraints
- Classification
- Unclassified
Quality
Attribute Quality
Positional Accuracy
Conceptual Consistency
- Comments
- All raster values are within expected data ranges.
Missing Data
- Comments
- The raster data set consists of full data tiles (no null space) and the extent and coverage is common with the other datasets in this project.
Excess Data
Acquisition Info
- Platform Type
- Aerial
- Assembly
- Single
- Tile Size
- 1 km
Raster Data Details
- Raster Type
- DEM
- X Pixel Resolution (cm)
- 1cm
- Y Pixel Resolution (cm)
- 1cm
- Seamlessness
- Full
- Number of Bands
- 1
- Band List
- 1
- Resampling Kernel
- Not Entered
- Rectification Type
- Not Entered
- Platform Name
- Fixed Wing Aircraft
Raster Type Details
- DEM Creator
- Supplier
Point Cloud Data Details
Contour Data Details
Survey Details
Sensor
- Title
- Optech Galaxy Prime
- Identifier
- Aerial
- Type
- LIDAR
Aerial Survey Details
- Runs
- 104
- Run Orientation
- N-S
- Swath Width
- 1000
- Flying Height Unit
- agl metre
- Flight Height
- 1000
Overviews
Provided by
![](https://metashare.maps.vic.gov.au/geonetwork/srv/../images/logos/b1edbae3-b4a9-485d-a9c5-895f3deda748.png)
Views Views
984881aa-ceb1-5484-a8eb-537bf8490b02
Access to the portal Access to the portal
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Associated resources
Not available