This shows a continuous enhancement in the accuracy and reliability of satellite imagery data sources which form the source of Google Earth data. The most recent GE imagery (year 2018) was the most accurate while year 2000 was the least accurate.
The GE elevations were also compared to elevation data from two readily available 30-metre digital elevation models (DEMs)-the Shuttle Radar Topography Mission (SRTM) v3.0 and the Advanced Land Observing Satellite World 3D (AW3D) DEM v2.1. The horizontal accuracies of the images were evaluated by comparison with a very high resolution (VHR) digital orthophoto while the vertical accuracy was assessed by comparison with a network of 558 ground control points. This study therefore evaluates the horizontal accuracy of historical GE imagery at four epochs between year 20, and the vertical accuracy of its elevation data within Lagos State in Nigeria, West Africa. Given its popularity and usefulness, most users do not pay close attention to the positional accuracy of the imagery, and there is limited information on the subject. Google Earth (GE) is the most popular virtual globe in use today.
0 kommentar(er)
