Products

The Land Monitor project produces a number of information products which are available to the general public and the projects partner agencies. Available products include:

Online Interactive Maps

Land Monitor has an online map service available to assist land management and research. You can now view online, the products from Land Monitor at http://landmonitor.landgate.wa.gov.au

Vegetation Products

Salinity Monitoring Products

Digital Elevation Models

Accurate, high resolution DEMs have previously only been available for a small proportion of the south-west. Through the Land Monitor project, high quality DEMs have been produced using automated techniques for the south-west of WA's agricultural area, accurate to produce 2 metre contours (link to below “more information”).

Calibrated Landsat TM and ETM Satellite Imagery

Sequences of calibrated Landsat TM and ETM satellite imagery have been produced by the Land Monitor project. Being calibrated these scenes are suitable for time series analysis projects. (link to below “more information”)

Contours

With the elevation data (DEM) provided by Land Monitor, contours can be derived down to 2 metre intervals (more information ) Please contact Landgate's Geodata section geodata@landgate.wa.gov.au, (08) 9273 7045.

Vegetation Extent and Change

This product is a series of classifications of the extent of perennial vegetation provided as a 13-band raster file. Each band represents a date from 1988-present. The bands can be displayed to produce maps of change in perennial vegetation extent over time.

Vegetation History

The ‘Vegetation History’ product is produced from three dates of calibrated TM data. It provides visual displays which highlight areas of change in vegetation density over time. The product is suitable for visual interpretation of changes over the period. Other products provide maps and data sets more suitable for numerical summary and analysis. The product is a composite 3-band file comprised of a Vegetation Index (TM band 3 + TM band 5) / 2 from three summer dates. The data have first been calibrated to a common radiometric base. The Vegetation Index has been used as it provides a consistent contrast between perennial vegetation (dark) and most other cover types such as soil and dry annual pastures or stubble (bright).

This dataset provides a tool for the visual interpretation of perennial vegetation changes over 1988 to present.

No ground validation has been carried out and no attribution of the data is implied.

However visual interpretation of the adjacent example indicates that areas shaded grey from black to white have stayed relatively stable in perennial vegetation cover over 1988, 1994 and 2000, while any other colour present has undergone some change in vegetation status. The shades of blue indicating increase in vegetation cover while reds and yellows indicating vegetation loss / decline.

To view a colour legend please click here.


Vegetation History Example using 1988, 1996 and 2002 image dates

Vegetation Index Sequence

The ‘Vegetation Index’ product is multi-channel image file; each band of the file contains the same spectral index derived from a series of dates. The index values are (band3+band5)/2, calculated from summer dates of calibrated TM data, starting from 1988. This data is the input used to create the ‘Trend Summary’. Where an area is cloud covered on a particular date, the data have been masked and replaced with a value of zero. This data product can be used to produce colour image displays of change in perennial vegetation from selected dates, – similar to the ‘Vegetation History’ product. Some displays will be improved using the appropriate date masks from the ‘Vegetation Extent and Change’ product. The data can also be used to plot time traces of index values for pixels or patches of remnant vegetation. These can be used in association with the various change map products to reveal and compare the patterns of response for areas of interest or concern.


Vegetation Index Sequence Example using 1998, 2000 and 2002 image dates

The ‘Vegetation Trend’ product is multi-channel image file which contains summaries of change in reflectance of vegetation over time. It is produced from twenty summer dates of calibrated TM data, at approximately 2-yearly intervals from 1988 and annual intervals from 2002. The index used is the sum of TM band3 and band5; the summaries of change which are produced for each pixel are recorded as 6 bands, scaled to fit the 1-byte range of 0-255.

Band 1 : Mean index brightness over all dates
Band 2 : linear trend (slope) in brightness over time (scaled)
Band 3 : Quadratic trend (scaled)
Band 4 : standard deviation (sd) about mean (scaled)
Band 5 : residual sd after fitting linear trend (scaled)
Band 6 : residual sd after fitting linear and quadratic trends (scaled)

Areas which were never classified as having perennial vegetation cover over the period have been masked out and given a zero value in all bands; these will include some areas of very thin native vegetation. The bands can be displayed separately or together to summarise trends and stability of vegetation over time as measured by the index, and in particular to highlight areas with different patterns of change. One recommended display shows positive and negative linear trends in different colours; while other bands can be used to examine deviations from these trends.

The ‘Trendclass’ product is a simplified one-band summary of the linear trend over the whole period broken into five classes chosen from inspection only. The classes have been determined by numeric changes in the reflectance index without ground or ecological interpretation, and may be interpreted tentatively as follows:

1. Major positive trend in vegetation density over the entire period
2. Positive trend
3. No major change
4. Negative trend
5. Major negative trend


Vegetation Trends Example


Vegetation Trend Classes Example

Salinity Monitoring Product

The Land Monitor project has produced maps showing the changes in salt-affected land over the south-west agricultural area of Western Australia. The product indicates the extent of salinity in the years 1987-1992 and then how the extent has changed in 1995 / 2000. The method involves the processing of historic calibrated Landsat satellite imagery in conjunction with elevation data and ground information to identify areas of land that are salt-affected.


Salinity Monitoring Product Example

Salinity Monitoring 1988 - 2000
Last Updated 04 October 2002

The salinity monitoring progress map shows current coverage available.

  • green is perennial vegetation
  • red is salt affected land
  • cream is agricultural land
  • white has not been mapped

Valley Hazard Maps / Areas at Risk of Developing High Water Tables

By integrating Landsat imagery with landform information derived from height data, ground truthing and other existing mapped datasets, areas at risk of developing high water tables can be predicted.


Areas at risk of developing high water tables

Digital Elevation Models

Accurate, high resolution DEMs have previously only been available for a small proportion of the south-west. Through the Land Monitor project, high quality DEMs have been produced using automated techniques for the south-west of WA's agricultural area. The DEMs are available from Landgate's Geodata section geodata@landgate.wa.gov.au, (08) 9273 7045.


Digital Elevation Model example with sun shading applied

Calibrated Landsat TM and ETM Products

Sequences of calibrated Landsat TM and ETM satellite imagery have traditionally been produced by the Land Monitor project. Now Land Monitor is using the Geoscience Australia Nadir Corrected BRDF Adjusted Reflectance (NBAR) where BRDF stands for Bidirectional Reflectance Distribution Function. See http://geoscienceaustralia.github.io/digitalearthau/data

Contours to 2m Intervals

From the high resolution DEMs, Landgate can produce 2m contours for the south-west of WA's agricultural area. For more information, please contact Landgate's Geodata section geodata@landgate.wa.gov.au, (08) 9273 7045 or see Landgate > Products and Services.

product screenshots - small

Info | Products