Explain how GIS, remote sensing and GPS are used in planning and apply them to spatial analysis

What this dot point is asking

SCSA wants you to know what each spatial technology does, how it supports planning, and how to interpret spatial data in stimulus questions. This is a skills dot point that appears directly in the external examination.

The main spatial technologies

• GIS. Layers and analyses spatial data, the core planning tool.
• Remote sensing and satellite imagery. Captures information about the surface from aircraft and satellites, used to map land cover and monitor change.
• GPS. Provides precise location, used to collect field data and georeference observations.

How spatial technologies support planning

Planning is fundamentally about location, and these tools turn data into decisions.

• Mapping the present. Layering current land use, infrastructure, population and environment to understand a place.
• Overlay and suitability analysis. Combining layers to find sites that meet criteria, for example land that is flat, near transport, outside flood zones and not high-value habitat.
• Monitoring change. Comparing satellite images over time to track urban sprawl, vegetation loss or coastal change.
• Modelling and scenarios. Projecting growth and testing where infrastructure or housing should go.
• Communicating decisions. Producing clear maps for the public and stakeholders.

Interpreting spatial data in the exam

Stimulus questions often present GIS layers, satellite images or thematic maps and ask you to analyse them.

Strengths and limitations

Spatial technologies are powerful: they integrate huge datasets, reveal patterns the eye would miss, and make decisions transparent and repeatable. But they have limits. Outputs depend entirely on data quality, currency and resolution. They can give a false impression of precision, omit social context that does not map easily, and concentrate power with those who control the data. A strong answer treats the technology as essential decision support, not an automatic answer.

A balanced response shows how GIS, remote sensing and GPS work together to inform sustainable planning, while interpreting their outputs critically.

How the technologies work together

The three technologies are most powerful in combination rather than alone, and examiners reward students who show this integration. Remote sensing and satellite imagery supply up-to-date surface data over large areas, for example mapping vegetation loss or the spread of urban land cover. GIS then stores that imagery alongside other layers such as population, transport and hazard data and analyses the relationships between them. GPS links the desk-based analysis back to the real world by recording the exact location of field observations, so that ground truthing can confirm what the imagery suggests. A planning workflow might therefore use satellite imagery to detect change, GIS to analyse and model where growth should go, and GPS to verify conditions on site, with the final maps communicating the decision to the public and stakeholders. Showing this end-to-end chain, rather than describing each tool in isolation, demonstrates the applied understanding the course requires.