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:Vegetation Products
Salinity Monitoring Products
Digital Elevation ModelsAccurate, 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 ( more information ).Calibrated Landsat TM and ETM Satellite ImagerySequences 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.( more information ) Customised / Value Added ProductsOther non-core products can also be produced either by the Land Monitor Technical Officer or by its partner agencies. For example:
NEW Online Interactive Maps
Vegetation Extent and ChangeThis 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 1988-2009. The bands can be displayed to produce maps of change in perennial vegetation extent over time.
« top Vegetation Index SequenceThe ‘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 HistoryThe ‘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).
« top Vegetation TrendsThe ‘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:
« top Salinity Monitoring ProductThe 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.
« top Valley Hazard Maps / Areas at Risk of Developing High Water TablesBy 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.
« top Digital Elevation ModelsAccurate, 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 Land Monitor in 3 formats:
« top Calibrated Landsat TM and ETM ProductsSequences of calibrated Landsat TM and ETM satellite imagery have been produced by the Land Monitor project.
« top Contours to 2m IntervalsFrom the high resolution DEMs, DLI can produce 2m contours. The contours will be produced on a 'user request' basis and can be supplied in digital or printed form. For more information please contact Landgate's Geodata section geodata@landgate.wa.gov.au, (08) 9273 7045 or see Landgate > Products and Services.
« top Ortho-photosAerial photos are rectified using digital elevation models to produce ortho-photos. Ortho-photos are suitable to produce maps down to 1:10000 scale and in some cases 1:5000 scale.DLI's coverage of ortho-photography will be increased with new photography over the agricultural area from the Land Monitor project. Please inquire with Landgate's Geodata section geodata@landgate.wa.gov.au, (08) 9273 7045 or see Landgate > Products and Services to find out the current ortho-photo coverage.
« top Satellite Image MapsLandsat Satellite imagery can be combined with other datasets to produce image maps. In this example below shire boundaries have been overlaid to give a 'whole of shire' perspective on water, vegetation and soil activities. Please inquire for data availability and costing.
« top Satellite Imagery Merged with Ortho-photosLandsat Satellite imagery can be merged with ortho-photos to produce a high resolution colour map products. The high spatial resolution of the ortho-photo is combined with the spectral (colour) information from the Landsat TM imagery. Please compare the above ortho-photo example and the merged Landsat / ortho-photo example to below and note the additional information found between and within each paddock and vegetated area.
« top Ortho-photos with contoursFrom the High resolution DEMs, contours down to 2m can be produced. The contours can then be integrated with other data such as ortho-photography or satellite imagery. For more information please contact Landgate's Geodata section geodata@landgate.wa.gov.au, (08) 9273 7045 or see Landgate > Products and Services.
« top For more information, contact: Ken Dawbin Tel: (08) 9387 0333 Fax: (08) 9383 7142 Email: ken.dawbin@landgate.wa.gov.au Home | Info | Progress | Products | Reports | Contact | Feedback | What's new? |
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