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Identification

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

02751844-2653-450a-b75f-83b24620e0b7

Presentation form

Image digital

Edition

1

Dataset language

English

Metadata standard

Name

ISO 19115

Edition

2016

Dataset URI

https://www.planningportal.nsw.gov.au/opendata/dataset/02751844-2653-450a-b75f-83b24620e0b7

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

Classification of spatial data and services

Field Value

Topic category

environment

Keywords

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

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

Full postal address

NSW

Australia

data.broker@environment.nsw.gov.au

Telephone number

131555

Email address

data.broker@environment.nsw.gov.au

Web address

https://www.nsw.gov.au/departments-and-agencies/dcceew

Responsible party role

pointOfContact

Quality and validity

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

Constraints related to access and use

Field Value

Constraint set

Use constraints

This data is provided under a Creative Commons Attribution 4.0 licence http://creativecommons.org/licenses/by/4.0. Attribute 'NSW Department of Climate Change, Energy, the Environment and Water' in publications using this data.

Limitations on public access

Responsible organisations

Field Value

Responsible party

Contact position

Data Broker

Organisation name

NSW Department of Climate Change, Energy, the Environment and Water

Full postal address

NSW

Australia

data.broker@environment.nsw.gov.au

Telephone number

131555

Email address

data.broker@environment.nsw.gov.au

Web address

https://www.nsw.gov.au/departments-and-agencies/dcceew

Responsible party role

pointOfContact

Metadata on metadata

Field Value

Metadata point of contact

Contact position

Data Broker

Organisation name

NSW Department of Climate Change, Energy, the Environment and Water

Full postal address

NSW

Australia

data.broker@environment.nsw.gov.au

Telephone number

131555

Email address

data.broker@environment.nsw.gov.au

Web address

https://www.nsw.gov.au/departments-and-agencies/dcceew

Responsible party role

pointOfContact

Metadata date

2024-02-26T13:45:18.506870

Metadata language