Comparative Analysis: 10 Most Liveable Cities
The following visualizations compare key urban green infrastructure metrics across all 10 cities, derived from Sentinel-2 satellite imagery. These metrics provide objective, data-driven insights into each city's vegetation coverage, urban development intensity, and blue-green infrastructure.
Total Green Cover Comparison
Figure 1: Total green cover percentage across all 10 cities, measured using NDVI from Sentinel-2 satellite imagery. Higher percentages indicate more extensive vegetation coverage including parks, forests, gardens, and green corridors.
Mean NDVI (Vegetation Health Index)
Figure 2: Mean NDVI values indicating overall vegetation health and density. Values range from -1 to +1, with higher values representing healthier, denser vegetation.
Urban Built-Up Intensity (NDBI)
Figure 3: Built-up intensity measured using NDBI. Lower values indicate less dense urban development and more integration with natural landscapes.
Blue-Green Infrastructure Coverage
Figure 4: Combined view of green infrastructure (vegetation) and blue infrastructure (water bodies). Water bodies detected using MNDWI.
Comparative Metrics: All 10 Cities
Ranked by total green cover percentage. All metrics derived from Sentinel-2 satellite imagery (10-meter resolution).
| Rank | City | Green Cover % | NDVI (Mean) | Built-Up Intensity | Water Bodies % | Ecological Balance |
|---|---|---|---|---|---|---|
| 1 | Sydney, Australia | 46.0% | 0.243 | -0.081 | 30.0% | 4605.40 |
| 2 | Adelaide, Australia | 30.2% | 0.212 | -0.019 | 4.3% | 3017.35 |
| 3 | Geneva, Switzerland | 23.3% | 0.197 | -0.095 | 9.1% | 2331.49 |
| 4 | Auckland, New Zealand | 21.6% | 0.154 | -0.038 | 18.2% | 2165.15 |
| 5 | Melbourne, Australia | 19.2% | 0.162 | -0.014 | 18.6% | 1923.87 |
| 6 | Copenhagen, Denmark | 15.2% | 0.148 | 0.013 | 5.1% | 11.44 |
| 7 | Zurich, Switzerland | 14.7% | 0.155 | 0.007 | 8.3% | 1470.55 |
| 8 | Vancouver, Canada | 7.7% | 0.089 | 0.002 | 32.3% | 768.70 |
| 9 | Osaka, Japan | 0.8% | 0.033 | -0.005 | 33.4% | 77.01 |
Note: Rankings based on total green cover percentage. Higher green cover and NDVI values indicate more extensive vegetation. Lower built-up intensity values suggest better integration with natural landscapes. Ecological balance score is a composite metric (higher is better).
Key Findings & Analysis
The satellite data reveals intriguing patterns in green cover distribution among the world's most liveable cities. The green cover ranges from a mere 0.8% in Osaka, Japan, to a commendable 46.0% in Sydney, Australia. The mean green cover stands at 19.9%, with a median of 19.2%, indicating a slightly right-skewed distribution. Sydney, Adelaide, and Geneva emerge as frontrunners in urban forestry, boasting green cover percentages of 46.0%, 30.2%, and 23.3% respectively. Conversely, Osaka, Vancouver, and Zurich lag behind with green cover percentages of 0.8%, 7.7%, and 14.7% respectively.
The NDVI (Normalized Difference Vegetation Index) statistics further underscore the variability in vegetation health and density. The NDVI range spans from 0.033 to 0.243, with a mean of 0.155, suggesting diverse levels of vegetation vitality across these cities. Built-up intensity, measured by the range of -0.095 to 0.013 with a mean of -0.026, reflects the extent of urban development and its impact on green spaces.
Notable gaps exist, particularly in cities like Osaka and Vancouver, where green cover is alarmingly low. These cities present significant opportunities for enhancing urban forestry initiatives to improve liveability. Conversely, cities like Sydney and Adelaide set exemplary standards, demonstrating the potential benefits of robust green cover.
These findings underscore the critical role of green cover in urban liveability. Cities with higher green cover percentages not only offer residents better air quality, cooler temperatures, and enhanced mental well-being but also foster biodiversity and provide recreational spaces. As urban populations continue to grow, prioritizing green infrastructure will be essential in creating sustainable, livable cities for the future.