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Transferring Google Earth observations to GIS-software: example from gully erosion study

International Journal of Digital Earth 2013年第2期6卷 196-201页

作者： amaury frankl Ann Zwertvaegher Jean Poesen Jan Nyssen Department of Geography Ghent UniversityGhentBelgium Department of Geology and Soil Science Ghent UniversityGhentBelgium Department of Earth and Environmental Sciences KU LeuvenHeverleeBelgium

High-resolution images availableonGoogle Earth are increasingly beingconsulted in geographic ***,most studies limit themselves to visualizations or on-screen *** Earth allows users to create points,lines,and polygons on-screen,which can be saved as Keyhole Markup Language(KML)***,the use of R statistics freeware is proposed to easilyconvertthese files to the shapefile format[or‘.shp file format’],which can be loaded into Geographic Information System(GIS)software(ESRI ArcGIS 9 in our example).The geospatial data integration in GIS strongly increases the analysis possibilities.

关键词： geographic study geospatial data integration Google Earth

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Using image-based modelling(SfM–MVS)to produce a 1935 ortho-mosaic of the Ethiopian highlands

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International Journal of Digital Earth 2015年第5期8卷 421-430页

作者： amaury frankl Valérie Seghers Cornelis Stal Philippe De Maeyer Gordon Petrie Jan Nyssen Department of Geography Ghent UniversityGhentBelgium School of Geographical&Earth Sciences University of GlasgowGlasgowScotlandUK

Approximately 34,000 aerial photographs covering large parts of Ethiopia and dating back to 1935–1941 have been recently *** allow investigating environmental dynamics for a past period that until now is only accessible from terrestrial photographs or *** the archive consists of both oblique and vertical aerial photographs that cover rather small areas,methods of image-based modelling were used to orthorectify the *** this study,9 vertical and 18 low oblique aerial photographs were processed as an ortho-mosaic,covering an area of 25 km2,west of Wukro town in northern *** 15 control points(derived from Google Earth),a Root Means Square Error of 28.5 m in X 35.4 m in Y were *** values can be viewed as optimal,given the relatively low resolution and poor quality of the imagery,the lack of metadata,the geometric quality of the Google Earth imagery and the recording *** use remained largely similar since 1936,with large parts of the land being used as cropland or extensive grazing *** remarkable changes are the strong expansion of the settlements as well as land management *** a larger effort,ortho-mosaics covering large parts of Ethiopia in 1935–1941 will be produced.

关键词： land use oblique aerial photograph ortho-mosaic PhotoScan Structure from Motion-MultiView Stereo

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Tree-based ecosystem services supply and multifunctionality of church forests and their agricultural matrix near Lake Tana,Ethiopia

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Forest Ecosystems 2023年第6期10卷 656-667页

作者： Ferehiwot Mequanint Tobias Fremout Diederik Strubbe Alemayehu Wassie Shimelis Aynalem Enyew Adgo Jan Nyssen amaury frankl Luc Lens Bart Muys Department of Wildlife and Ecotourism Management Bahir Dar UniversityBahir DarEthiopia Terrestrial Ecology Unit Ghent UniversityGhentBelgium Division Forest Natureand LandscapeKU LeuvenLeuvenBelgium Alliance Biodiversity International–CIAT LimaPeru Organization for Rehabilitation and Development in Amhara Bahir DarEthiopia Department of Natural Resource Management Bahir Dar UniversityBahir DarEthiopia Department of Geography Ghent UniversityGhentBelgium INRAE AMAPIRDCIRADCNRSUniversity MontpellierBld de La Lironde34398Montpellier Cedex 5France

Ecosystem services(ES)are the connection between nature and society,and are essential for the well-being of local communities that depend on *** Ethiopia,church forests and the surrounding agricultural matrix supply numerous ***,the ES delivered by both land use types have not yet been assessed *** we surveyed both church forests and their agricultural matrices,aiming to quantify,compare and unravel the drivers underlying tree-based ES supply,density and *** found that almost all church forests and half of the agricultural matrices provided high ES *** multifunctionality was higher in the agricultural matrices,suggesting that people deliberately conserve or plant multifunctional tree ***,the supply of all categories of ES was positively correlated with church forest age(p-value<0.001)in the agricultural matrix,while the extent of church forest was positively correlated with the density of all categories ecosystem services score in the church forests(p-value<0.001).Our results can be used to prioritize conservation efforts at sites that provide high levels of ES supply,ES density and ES multifunctionality,and to prioritize restoration efforts at sites with low levels thereof.

关键词： Church forest Remnant forest Provisioning service Regulating service Cultural service Multifunctionality Key informant interview Agricultural matrix

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Changes in land use/cover mapped over 80 years in the Highlands of Northern Ethiopia

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Journal of Geographical Sciences 2018年第10期28卷 1538-1559页

作者： ETEFA Guyassa amaury frankl Sil LANCKRIET BIADGILGN Demissie GEBREYOHANNES Zenebe AMANUEL Zenebe Jean POESEN Jan NYSSEN Department of Geography Ghent University Department of Land Resources Management and Environmental Protection Mekelle University Research Foundation Flanders (FWO) Department of Geography and Environmental Studies Mekelle University Institute of Geo-information and Earth Observation Sciences Mekelle University Division of Geography Department of Earth and Environmental Sciences

Despite many studies on land degradation in the Highlands of Northern Ethiopia, quantitative information regarding long-term changes in land use/cover(LUC) is rare. Hence, this study aims to investigate the LUC changes in the Geba catchment(5142 km2), Northern Ethiopia, over 80 years(1935–2014). Aerial photographs(APs) of the 1930 s and Google Earth(GE) images(2014) were used. The point-count technique was utilized by overlaying a grid on APs and GE images. The occurrence of cropland, forest, grassland, shrubland, bare land, built-up areas and water body was counted to compute their fractions. A multivariate adaptive regression spline was applied to identify the explanatory factors of LUC and to create fractional maps of LUC. The results indicate significant changes of most types, except for forest and cropland. In the 1930 s, shrubland(48%) was dominant, followed by cropland(39%). The fraction of cropland in 2014(42%) remained approximately the same as in the 1930 s, while shrubland significantly dropped to 37%. Forests shrank further from a meagre 6.3% in the 1930 s to 2.3% in 2014. High overall accuracies(93% and 83%) and strong Kappa coefficients(89% and 72%) for point counts and fractional maps respectively indicate the validity of the techniques used for LUC mapping.

关键词： fractional map Google Earth land use/cover multivariate adaptive regression Italian aerial photographs

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