This year is critical for climate action; it is the official launch of the global climate action under the Paris Climate Agreement, and the deadline for the global call for more ambitious climate action plans, the Nationally Determined Contributions (NDCs). Satellite data and geospatial analysis can offer invaluable guidance.
Satellite imagery offers a birds-eye view to efficiently assess conditions on the Earth’s surface and data gathered from satellites is increasingly used to track progress. It can collect information and track trends both at a local, zoomed-in scale, highlighting individual cities or buildings, and across much larger regions. The range of environmental and socio-anthropological trends that can be studied using geospatial data make it extremely valuable for climate action planning. Soil erosion, shrinking glaciers, urban expansion, development of electrical grids, changes in irrigation infrastructure and agriculture, sea level rise and coral reef damage can all be captured from satellite data.
Satellite images play a key role in helping policymakers monitor changes in forests. In Cabo Verde we can use satellite imagery to set objectives and monitor progress on its NDC targets to increase its forest cover. As demonstrated in Image 1 (below), from 2002 and 2014, the progress made from previous afforestation programmes on arid lands in Santiago, Cabo Verde is evident and new trees can easily be traced. This information enables policy planners to track the success of NDCs and to advise on reforestation and livelihood strategies.
Working with satellite images, policymakers can quantify changes in forest cover over time, by calculating the rate of forest loss and growth. These metrics are highly valuable for NDC goal setting, enabling a more precise understanding of what policies have been effective, and where resources should be directed.
Satellite imagery is also commonly used to record dramatic landscape changes such as those accompanying the construction of hydropower plants and reservoirs since it is a reliable method to track progress on hydropower investments (Image 2). In addition to Paraguay, Ecuador aims to significantly increase hydro power and Equatorial Guinea plans to develop hydroelectric potential on the Wele River. The progress of construction can be monitored through geospatial data, and other analytical assessments done to evaluate the impact on neighbouring communities.
Investment in other renewable energy sources, such as solar power, are also easy to detect — solar photovoltaic cells are generally large enough to be visible from satellites. Vanuatu has made solar power an important piece of its NDC with its aim to transition to 100 percent renewable energy by 2030.
Several countries propose changes to their agricultural sector as a part of their NDCs. Satellite imagery can be used to track and quantify changes, as demonstrated in Image 5 showing agricultural expansion in Wadi As-Sirhan Basin, Saudi Arabia.
A more advanced application of satellite data for agriculture is to extract information contained in the images to gain insight on irrigation practices and crop health (Image 6). With some additional processing, satellite imagery can be combined with climate information to assess how climate change is affecting agricultural, such as determining whether recent climate events correspond to changes in crop productivity.
As governments around the world refine their first-round climate action plans, establishing evidence-based approaches to reduce emissions and build resilience becomes a priority. Satellite images are an accurate, cost-effective, and timely source of data that will be highly useful in efforts to track progress mitigating and adapting to the effects of climate change.
By Sydney Neeley, GIS/Satellite Imagery Specialist, James Vener, Technical Specialist — Climate Change and Frieda Fein, GIS Specialist
UNDP’s GIS and Satellite Imagery Team is working with countries to provide free analysis and interpretation of the data.