PORTUGUESE
Recentemente, fui encarregado de mapear os dados anuais de Iluminação Noturna VIIRS (VNL) de 2012 a 2023 para cinco regiões: Madeira, Corvo, Graciosa, Tenerife e Las Palmas. Usando o ArcGIS Pro, visualizei as mudanças na intensidade da luz noturna (NTL) nessas regiões, fornecendo insights sobre a evolução dos cenários urbanos e econômicos. Neste post, focarei na Madeira, onde padrões distintos de intensidade de NTL revelam mudanças importantes ao longo do tempo.
ENGLISH
Recently, I was tasked with mapping annual VIIRS Nighttime Light (VNL) data from 2012 to 2023 for five regions: Madeira, Corvo, Graciosa, Tenerife, and Gran Canarias. Using ArcGIS Pro, I visualized the changes in nighttime light (NTL) intensity across these regions, providing insights into the evolving urban and economic landscapes. In this post, I will focus on Madeira, where distinct patterns of NTL intensity reveal key shifts over time.
VISUALIZING THE TRENDS
The infographic above illustrates the annual progression of NTL in Madeira from 2012 to 2023. Key observations include:
Concentration in the South: The highest light levels are concentrated in the southern areas of Madeira, with Funchal standing out as the most persistent bright spot. This suggests that economic activities, such as tourism, commerce, and residential expansion, are most concentrated here.
Decreasing Intensity, Expanding Coverage: While the core intensity of the lights has reduced from 2012 to 2023, the lights are now covering a larger geographic area. This could reflect infrastructure development, such as the expansion of road networks and lighting in more remote or previously underlit areas.
POTENTIAL CAUSES OF CHANGE
There are several factors that could explain these shifts in NTL intensity and coverage:
Land use changes and/ New Lighting Networks: The expansion of urban and suburban areas may have led to new lighting installations, particularly in areas that were previously darker. This could explain the increase in spatial coverage despite a decrease in intensity in some core areas.
Energy-Efficient Lighting: The adoption of energy-efficient lighting solutions such as LEDs could be contributing to the decrease in intensity. These technologies often provide the same level of visibility with lower energy consumption, reducing the overall brightness visible from satellites.
Monitoring and Controlling Light Pollution: There has been growing awareness about the environmental impacts of light pollution, leading to initiatives aimed at reducing unnecessary light emissions. Regulations or projects like this one could contribute to the more controlled and efficient use of outdoor lighting.
CONCLUSION
By mapping and analyzing the changes in NTL over the years, we can better understand how human activity, economic development, and environmental considerations shape a region. In Madeira, the trends suggest both expansion and adaptation, with more areas being lit up while managing light intensity in key urban regions. A comparison of these NTL trends with land-use changes in the region would offer even deeper insights into how urban development and infrastructure growth align with environmental sustainability. This offers a glimpse into the island’s evolving landscape and the balance between development and sustainability.
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