The accuracy of control points in more-developed countries is 24.1 meters RMSE, which is significantly more accurate than the control points in developing countries (44.4 meters RMSE t-test p-value < 0.01). The control points derived from satellite imagery have an accuracy of 22.8 meters RMSE, which is significantly more accurate than the 48 control-points based on aerial photography (41.3 meters RMSE t-test p-value < 0.01). Relative to Landsat GeoCover, the 436 Google Earth control points have a positional accuracy of 39.7 meters RMSE (error magnitudes range from 0.4 to 171.6 meters). Landsat GeoCover is an orthorectified product with known absolute positional accuracy of less than 50 meters root-mean-squared error (RMSE). Google Earth with Landsat GeoCover scenes over a global sample of 436 control points located in 109 cities worldwide. In: Simpósio Brasileiro de Sensoriamento Remoto, 10,Ĭuritiba, PR, 2011. Validação de imagens de alta resolução do Google Earth para produçãoĭe mapas. Other than at the bottom part that shows the vertical, horizontal, px, cm & inches options, the left edge has no other markings. I'm not sure what they are meaning, as the right edge of my vertical ruler has the ruler markings all down the side of it. I suppose that in the US the results may be even better. Some people have mentioned that the vertical ruler has a 'blank white section on the right edge'. Of course this is just a case of study, and these results depend on your area of study. *the error is just 1,39% for perimeters calculation īased on these results they concluded that you can use Google Earth as a good source for mapping in scales smaller than 1:150000, assuming the planimetrical error as 0,1 mm. *the error is just 3,54% for polygon measurements *the error is just 0,44% for line measurements In 2011 two brazilians published an article about it, and they concluded that:
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