Geography - Physiography - Elevation

Elevation data is a point, line or surface geographically located in the x and y relative to a horizontal datum, that includes a height (z) above or below a known vertical datum. Bathymetry will deal with all offshore elevation data.

- Elevation data will include both raw elevation data and digital elevation models (DEM);

- Spot Heights, points on the earth's surface, of known elevation.

- Contours, lines which represents an imaginary line on the ground joining points of equal elevation.

- Horizontal Control Points, points on the ground, the horizontal position of which has been determined by geodetic survey.

- Digital Elevation Models (DEM) are interpolated representations of a surface. Elevation points are spaced at a regular interval so as to create a grid or lattice. These grids can be directly observed or, more generally, they are computed from more than one of the above mentioned irregular spaced elevations.

- Digital Terrain Models (DTM) are bare earth DEM's representing the terrain They are interpolated using a combination of elevation information and could also be constrained using break lines, such are cliffs, drainage, coast etc.

- Digital Surface Models (DSM) are also DEM's, but they include non-surface objects like trees, buildings etc. So, a DSM = DTM + all non surface objects.

- Triangulated Irregular Network (TIN). A vector data structure that partitions geographic space into contiguous, nonoverlapping triangles. The vertices of each triangle are sample data points

with x, y, and z values. These sample points are connected by lines to form Delaunay triangles.

TINs are used to store and display elevation models.

- Hydrologically enforced Digital Elevation Models (HDEM) represents DEM with drainage enforcement.

The quality of a DEM is a measure of how accurate elevation is at each pixel (absolute accuracy) and how accurately the morphology is represented (relative accuracy). Several factors affect the quality of DEM-derived products: terrain roughness, sampling density (elevation data collection method), grid resolution or pixel size, interpolation algorithm, vertical resolution and terrain analysis algorithm.

Simple

Identification info

Date (Publication)
2011-01-01T00:00:00
Edition

Revision

Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/74620

Cited responsible party
Role Organisation / Individual Name Details
Author

Anderson, H.

 1
Point of contact
Role Organisation / Individual Name Details
Custodian

EGD
Owner

Commonwealth of Australia (Geoscience Australia)
Custodian

Commonwealth of Australia (Geoscience Australia)

 Voice
Topic category
  • Geoscientific information

Extent

N
S
E
W


Maintenance and update frequency
As needed
Keywords

  • Database

Theme

  • land

Theme

  • hydrology

Keywords

  • AU

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

Keywords

  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

 Voice
OnLine resource

Related Product

Digital Elevation Data web page

Resource lineage

Statement

Coverage: Australia excluding external territories. National, regional, state and local extents (LIght Detection And Ranging (LiDAR) usually by Project area). Key Clients: Industry, Government, Internal Geoscience Australia, Academia, Researchers. Note: Government agencies (including local, state, Catchment Management Authorities), Flood and hydrological modellers; Universities and research organisations; and Spatial industry.

Need to move toward all data being whole of government licencing or Creative Commons. Currently in negotiations to release SRTM products under Creative Commons rather than restricted government use licence. Some data still to be processed by Geoscience Australia or external government agencies as data has not passed elevation quality checks.

Hierarchy level
Dataset
Description

Geoscience Australia plus Victorian Government

Metadata constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/c886ad40-3d35-3755-e044-00144fdd4fa6

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

 Voice

Type of resource

Resource scope
Dataset
Name

dataset

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/74620

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/c886ad40-3d35-3755-e044-00144fdd4fa6

Date info (Revision)
2018-04-22T08:16:19
Date info (Creation)
2012-08-31T00:00:00

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

Spatial extent

N
S
E
W


Keywords

hydrology land

Provided by

Access to the portal

Associated resources

Not available