Qual è la differenza tra Google Maps e Google Earth?
You can view and compare satellite imagery from 1980 to 2025 using platforms like Google Earth and other historical satellite imagery tools. However, direct coverage for the exact year 1980 is limited, as most freely accessible global satellite imagery begins in the early 1980s, notably with the Landsat missions—Landsat 4 (1982) and Landsat 5 (1984)—which provide coverage at 30–80m resolution [3]. For more recent years, including 2025, there is much higher resolution data available from multiple satellites [2] [3].
How to access historical satellite imagery using Google Earth:
- Google Earth’s Historical Imagery feature allows you to view satellite imagery for many places and scroll through time using a timeline slider. The coverage depends on the global location and the availability of archived images. Some locations have data dating back to the mid-1980s [5] [1].
- To use this feature: open Google Earth (web or app), switch to Satellite view, search for your area of interest, and click the "Historical Imagery" icon or use the time slider to select the desired year [5] [1].
- Note that imagery before the mid-1980s may not be available, especially for non-urban or less frequently imaged areas [4] [8].
Other sources for 1980s–2025 satellite imagery:
- EOSDA LandViewer provides access to old satellite images dating back to 1982, sourced from multiple satellites, and includes options to filter by year, cloud cover, and image resolution [2].
- GrainDataSolutions offers a web app for comparing Landsat images from the 1980s with more recent data (through 2024), overlaying changes for analysis of landscape evolution over time. The oldest global, freely available imagery usually starts in 1982 (Landsat 4) [3].
- ArcGIS World Imagery Wayback and other geographic information service platforms maintain archives of global imagery but, like Google Earth, have denser coverage from around the mid-1980s onward [9].
Limitations:
- Imagery for 1980 specifically is rare. Most freely accessible datasets with global coverage start in 1982 (with Landsat 4). Prior to this, available images are typically from specialized archives, are lower resolution, or cover only selected regions [3] [2].
- Urban areas and regions of specific interest (e.g., rapid development, environmental change) often have more frequent and higher-quality imagery in the archives compared to rural or remote regions [5].
- The clarity and resolution for 1980s data will be substantially lower (typically 30–80m/pixel) than for modern imagery (which can be sub-meter resolution in recent years) [2] [3].
To summarize, while you cannot generally find satellite images for the year 1980 specifically on Google Maps, you can use Google Earth and other platforms like EOSDA LandViewer and ArcGIS to view historical imagery starting in the early 1980s and scroll forward to 2025, especially for well-covered areas [1] [2] [3] [5].