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Horizontal Positional Accuracy of Google Earth's High-Resolution Imagery Archive

Google Earth now hosts high-resolution imagery that spans twenty percent of the Earth's landmass and more than a third of the human population. This contemporary high-resolution archive represents a significant, rapidly expanding, cost-free and largely unexploited resource for scientific inquir...

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Autor principal: Potere, David
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International (MDPI) 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3791001/
https://www.ncbi.nlm.nih.gov/pubmed/27873970
http://dx.doi.org/10.3390/s8127973
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author Potere, David
author_facet Potere, David
author_sort Potere, David
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description Google Earth now hosts high-resolution imagery that spans twenty percent of the Earth's landmass and more than a third of the human population. This contemporary high-resolution archive represents a significant, rapidly expanding, cost-free and largely unexploited resource for scientific inquiry. To increase the scientific utility of this archive, we address horizontal positional accuracy (georegistration) by comparing Google Earth with Landsat GeoCover scenes over a global sample of 436 control points located in 109 cities worldwide. Landsat GeoCover is an orthorectified product with known absolute positional accuracy of less than 50 meters root-mean-squared error (RMSE). 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). 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). 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). These findings indicate that Google Earth high-resolution imagery has a horizontal positional accuracy that is sufficient for assessing moderate-resolution remote sensing products across most of the world's peri-urban areas.
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spelling pubmed-37910012013-10-18 Horizontal Positional Accuracy of Google Earth's High-Resolution Imagery Archive Potere, David Sensors (Basel) Article Google Earth now hosts high-resolution imagery that spans twenty percent of the Earth's landmass and more than a third of the human population. This contemporary high-resolution archive represents a significant, rapidly expanding, cost-free and largely unexploited resource for scientific inquiry. To increase the scientific utility of this archive, we address horizontal positional accuracy (georegistration) by comparing Google Earth with Landsat GeoCover scenes over a global sample of 436 control points located in 109 cities worldwide. Landsat GeoCover is an orthorectified product with known absolute positional accuracy of less than 50 meters root-mean-squared error (RMSE). 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). 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). 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). These findings indicate that Google Earth high-resolution imagery has a horizontal positional accuracy that is sufficient for assessing moderate-resolution remote sensing products across most of the world's peri-urban areas. Molecular Diversity Preservation International (MDPI) 2008-12-08 /pmc/articles/PMC3791001/ /pubmed/27873970 http://dx.doi.org/10.3390/s8127973 Text en © 2008 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland. This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Potere, David
Horizontal Positional Accuracy of Google Earth's High-Resolution Imagery Archive
title Horizontal Positional Accuracy of Google Earth's High-Resolution Imagery Archive
title_full Horizontal Positional Accuracy of Google Earth's High-Resolution Imagery Archive
title_fullStr Horizontal Positional Accuracy of Google Earth's High-Resolution Imagery Archive
title_full_unstemmed Horizontal Positional Accuracy of Google Earth's High-Resolution Imagery Archive
title_short Horizontal Positional Accuracy of Google Earth's High-Resolution Imagery Archive
title_sort horizontal positional accuracy of google earth's high-resolution imagery archive
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3791001/
https://www.ncbi.nlm.nih.gov/pubmed/27873970
http://dx.doi.org/10.3390/s8127973
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