Field | Value |
---|---|
Title |
Steep Land |
Abstract |
Steep Land was first acknowledged within the Soil Conservation Act 1938 legislation as Protected Lands primarily due to land degradation impacts associated with tree clearing. Early designation of these areas was mapped by hand using topographic basemaps or interpreted from aerial photographs with 3D stereoscopes at various scales. Then acquisition of satellite data enabled all of NSW to be captured, however this was coarse and mapping of steep lands remained disputable over some areas. In 2020 Department of Customer Services (DCS) released state-wide 5m resolution digital elevation data in the form of aerial lidar and photogrammetric point-cloud. This has been generated from a combination of 1km, 2km and 5km tiles. Department of Planning, and Environment have utilised the source data from DCS to create the Steep Land product. Data cleansing and quality assessments have been completed. The Steep Land 5m product has been created to effectively replace the following existing products: * Vulnerable Lands - Steep or Highly Erodible (SHE) * SRTM18 - Shuttle Radar How was Steep Land determined? Using a smoothed digital elevation model of the earth surface, a slope product was created. This was generated using the Horn 3x3 (1981) method which uses the eight pixels around the central cell to calculate the weighted gradient in north-south and east-west directions, and trigonometry to calculate the maximum slope in the aspect direction. Having determined the slope values, accurate identification of land 18 degrees or greater and 30 degrees or greater across NSW was possible. Steep areas are identified by thresholding the slope value. Only the values of interest are extracted. The Steep Land products are available covering NSW or in zone mosaics 54, 55, 56. They are in binary form. Please adjust the symbology as required. 18 degrees: * 0 - Not Steep (below 18 degrees) * 1 - Steep (areas identified as 18 degrees or greater). 30 degrees: * 0 - Not Steep (below 30 degrees) * 1 - Steep (areas identified as 30 degrees or greater). Please contact data.broker@environment.nsw.gov.au for more information. |
Resource locator |
|
Data Quality Statement |
Name: Data Quality Statement Protocol: WWW:DOWNLOAD-1.0-http--download Description: Data quality statement for Steep Land Function: download |
Fact Sheet - Steep Land |
Name: Fact Sheet - Steep Land Protocol: WWW:DOWNLOAD-1.0-http--download Description: Background, development and naming information Function: download |
Landholder Information - Steep Land |
Name: Landholder Information - Steep Land Protocol: WWW:DOWNLOAD-1.0-http--download Description: User friendly information on background and development Function: download |
SteepLand18_zone54 |
Name: SteepLand18_zone54 Protocol: WWW:DOWNLOAD-1.0-http--download Description: Steep Land 18 degrees or greater covering MGA Zone 54 GeoTiff - 10MB Function: download |
SteepLand18_zone55 |
Name: SteepLand18_zone55 Protocol: WWW:DOWNLOAD-1.0-http--download Description: Steep Land 18 degrees or greater covering MGA zone 55 GeoTiff - 110MB Function: download |
SteepLand18_zone56 |
Name: SteepLand18_zone56 Protocol: WWW:DOWNLOAD-1.0-http--download Description: Steep Land 18 degrees or greater covering MGA zone 56 GeoTiff - 180MB Function: download |
SteepLand18_nsw |
Name: SteepLand18_nsw Protocol: WWW:DOWNLOAD-1.0-http--download Description: Steep Land 18 degrees or greater covering NSW GeoTiff - 300MB Function: download |
SteepLand30_nsw |
Name: SteepLand30_nsw Protocol: WWW:DOWNLOAD-1.0-http--download Description: Steep Land 30 degrees or greater covering NSW Function: download |
SteepLand30_zone54 |
Name: SteepLand30_zone54 Protocol: WWW:DOWNLOAD-1.0-http--download Description: Steep Land 30 degrees or greater covering MGA Zone 54 Function: download |
SteepLand30_zone55 |
Name: SteepLand30_zone55 Protocol: WWW:DOWNLOAD-1.0-http--download Description: Steep Land 30 degrees or greater covering MGA Zone 55 Function: download |
SteepLand30_zone56 |
Name: SteepLand30_zone56 Protocol: WWW:DOWNLOAD-1.0-http--download Description: Steep Land 30 degrees or greater covering MGA Zone 56 Function: download |
Unique resource identifier |
|
Code |
4c18549b-a6bc-4519-bc6e-2ec92c7e0d62 |
Presentation form |
Image digital |
Edition |
1 |
Dataset language |
English |
Metadata standard |
|
Name |
ISO 19115 |
Edition |
2016 |
Dataset URI |
https://datasets.seed.nsw.gov.au/dataset/4c18549b-a6bc-4519-bc6e-2ec92c7e0d62 |
Purpose |
Planning, and management information |
Status |
Completed |
Spatial representation type |
grid |
Spatial reference system |
|
Code identifying the spatial reference system |
4283 |
Spatial resolution |
5 m |
Additional information source |
Meta data for every data tile which makes up the digital elevation model (parent data) is available from Department of Customer Services as a downloadable HTML file. Please refer to the Elevation Data Portal hosted by Geoscience Australia |
Field | Value |
---|---|
Topic category |
Field | Value |
---|---|
Keyword set |
|
keyword value |
PHOTOGRAPHY-AND-IMAGERY-Remote-Sensing LAND-Topography |
Originating controlled vocabulary |
|
Title |
ANZLIC Search Words |
Reference date |
2008-05-16 |
Geographic location |
|
West bounding longitude |
141 |
East bounding longitude |
154 |
North bounding latitude |
-37.7 |
South bounding latitude |
-28 |
Vertical extent information |
|
Minimum value |
-100 |
Maximum value |
2228 |
Coordinate reference system |
|
Authority code |
urn:ogc:def:cs:EPSG:: |
Code identifying the coordinate reference system |
5711 |
Temporal extent |
|
Begin position |
2011-01-01 |
End position |
N/A |
Dataset reference date |
|
Resource maintenance |
|
Maintenance and update frequency |
As needed |
Contact info | |
Contact position |
Data Broker |
Organisation name |
NSW Department of Climate Change, Energy, the Environment and Water |
Telephone number |
131555 |
Email address |
|
Web address |
https://www.nsw.gov.au/departments-and-agencies/dcceew |
Responsible party role |
pointOfContact |
Field | Value |
---|---|
Lineage |
Data is a collection of 5m Photogrametric - ADS derived 1m and 2m Pointcloud - Lidar derived The processing sequence: Resample to 5m DEM smoothing Slope creation using Horn 3x3 method Generate steep products, aspect, hillshade, 18 and 30 degrees Remove pixel islands and absorb holes equal to or 18 degrees) slope data (ba2) ba5 Steep layer 2, produced by thresholding (> 30 degrees) slope data (ba2) ba6 Sieved steep layer - Clumps less than threshold area absorbed into surrounding ba7 Finals - 100km mapsheet ba8 Mosaics |
Field | Value |
---|---|
Limitations on public access |
|
Field | Value |
---|---|
Responsible party |
|
Contact position |
Data Broker |
Organisation name |
NSW Department of Climate Change, Energy, the Environment and Water |
Telephone number |
131555 |
Email address |
|
Web address |
https://www.nsw.gov.au/departments-and-agencies/dcceew |
Responsible party role |
pointOfContact |
Field | Value |
---|---|
Metadata point of contact |
|
Contact position |
Data Broker |
Organisation name |
NSW Department of Climate Change, Energy, the Environment and Water |
Telephone number |
131555 |
Email address |
|
Web address |
https://www.nsw.gov.au/departments-and-agencies/dcceew |
Responsible party role |
pointOfContact |
Metadata date |
2024-02-26T13:45:15.225882 |
Metadata language |
|