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Technical Information


Product Description

The Geoscape product description provides detailed information on the dataset including scope, content and structure, quality, maintenance and delivery.


Online Data Delivery System Guide

The Online Data Delivery System is a warehouse to hold, quality assure and distribute PSMA Australia’s suite of national spatial datasets. Read the guide.


LYNX Data Importer User Guide

The LYNX Data Importer User Guide provides instructions on installing and using the PSMA LYNX Data Importer application for use with PSMA data provided in the LYNX proprietary format.

Frequently Asked Questions

What is Geoscape?

Geoscape is a suite of digital datasets representing buildings, surface cover and trees across the whole of Australia. The purpose of the Geoscape national dataset is to spatially represent building and related features for use by industry and government in digital applications and systems. It has links to other PSMA products including G-NAF (addresses), Cadlite (cadastre and property) and Administrative Boundaries (suburb/localities).

When will my locality be covered by Geoscape?

The Geoscape roll out schedule is available here.

Why is a building’s data missing in Geoscape?

The building may be considered smaller in area than 9m2

The building was missed by the DigitalGlobe process (generally ~99% of all buildings are captured with those missed usually smaller buildings)

The building didn’t exist when DigitalGlobe captured their imagery.

Why are some height values not accurate for trees that are close to buildings?

Where tall features like buildings and trees exist, the terrain has been smoothed and areas in close proximity to some of these high features appear to have higher than expected terrain values. With higher than expected terrain values, tree pixels close to tall buildings or other tall trees may appear to have lower than expected resulting tree heights. PSMA is working closely with data contributors to remediate this issue and expects to provide improved tree heights in future release of Geoscape.

Why are some roof material classifications incorrect, and what is PSMA doing about it?

PSMA has identified that there is an over classification of buildings with a primary roof material of “Tile”. These are more evident in areas of industrial zoning and buildings with iron appearance. PSMA is working with data contributors to continue to improve the classification accuracy of the roof materials.

How are you going to improve the data quality for surface cover?

Surface Cover for both 2 metre and 30 metre resolution is captured and supplied to PSMA in ‘strips’ defined by satellite coverage. Variation in ‘strips’ may dependent on a number of factors including the classification, atmospheric corrections, weather, and season when the image was captured. PSMA is working with contributors to improve classification consistency for both datasets.

What is PSMA doing to ensure accuracy when measuring heights in a new suburb with new buildings being erected?

Maximum Roof Heights and Average Eave Heights for buildings are dependent on the date of capture of source imagery used in the creation of the Digital Surface Model. Where buildings are part of a new development or re-development areas these heights are impacted. PSMA is investigating ways to identify or remediate the accuracy of heights across the dataset and specifically in new development or re-development areas.

When will PSMA have an accurate reflection of ‘real world trees’?

Although PSMA has tried to capture and represent real world trees as accurately as possible, PSMA has identified that a number of individual trees have not been captured in the trees dataset. PSMA are investigating and working to improve trees, including improvements to source heights, classifications and improved capture dates.

How is PSMA moving forward with boundary alignment results? (State/Territory Mesh blocks)

The misalignment of boundaries has resulted in a building (BUILDING_PID = BLDNSW0001772595) being allocated a Mesh Block in a different state/territory. PSMA is working towards resolving some of the issues in the boundary misalignment to accurately reflect where possible the allocation of Mesh Blocks, Suburbs/Localities and state/territories.

In regards to an over classification of water in places like airports – how can you be certain that it was not a rainy day when the images were taken?

PSMA has identified that in some areas of the 2m Surface Cover, specifically bitumen, an over classification of water is evident. Although most roads appear unaffected, areas like airport runways have a clear over classification. PSMA is working with contributors to improve the classification of bitumen for future releases.


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