In agriculture, surveying is required to prepare topographical maps that indicate variations in the level of the land's surface. Topographical maps are necessary as a base for the preparation of research station maps which include layout of field, buildings, roads, and soil conservation measures.
African tropical montane forests are facing fast and dynamic changes in land use. However, the impacts of these changes on stream water quality are understudied. This paper aims at assessing the effect of land use and physical catchment characteristics on stream water concentrations of dissolved ...
Jacobs, S.R.
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Breuer, L.
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Butterbach-Bahl, Klaus
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Pelster, David E.
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Rufino, Mariana C.
,
[Land use affects total dissolved nitrogen and nitrate concentrations in tropical montane streams in Kenya]
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Land use affects total dissolved nitrogen and nitrate concentrations in tropical montane streams in Kenya
This article presents a method that allows to study and correct the radiometric distortions caused by topography in SAR images. The method is easy to implement, and requires neither sophisticated software nor code-level programming. It also considers the case of a flat surface having an elevation...
Leclerc, G
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Beaulieu, Nathalie
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Bonn, F
,
[A simple method to account for topography in the radiometric correction of radar imagery]
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A simple method to account for topography in the radiometric correction of radar imagery
Documenting the scale and intensity of fine-scale spatial genetic structure (FSGS), and the processes that shape it, is relevant to the sustainable management of genetic resources in timber tree species, particularly where logging or fragmentation might disrupt gene flow. In this study we assesse...
Smith, J.R.
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Ghazoul, J.
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Burslem, D.F.R.P.
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Itoh, A.
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Khoo, E
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Lee, S.L.
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Maycock, C.R.
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Nanami, S.
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Siong Ng, K.S.
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Kettle, C.J.
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[Are patterns of fine-scale spatial genetic structure consistent between sites within tropical tree species?]
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Are patterns of fine-scale spatial genetic structure consistent between sites within tropical tree species?
La method d'echantillonnage du sol choisie des raisons qui motivent l'analyse du sol. Le sol ne forme pas une masse homogene. La vie vegetale, la topographie, les pratiques agronomiques, etc. affectent l'uniformite du sol. L'exactitude des donnees de l'analyse du sol est fonction de la precision ...
Pleysier, J.L.
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[Echantillonnage du sol et preparation des echantillons: guide de recherche de Iiita, No. 2]
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Echantillonnage du sol et preparation des echantillons: guide de recherche de Iiita, No. 2
In South Vietnam, cassava is grown both in the highlands and in the delta, on different soil groups, such as the yellowish red soils, grey degraded soils, alluvial soils and acid sulfate soils. These soils are located mostly in the Central Highlands, the Coastal Region and the Eastern Region of S...
The diversity of small-scale irrigation in the Ethiopian Blue Nile basin comprises small dams, wells, ponds and river diversion. The diversity of irrigation infrastructure is partly a consequence of the topographic heterogeneity of the Fogera plains. Despite similar social-political conditions an...
Eguavoen, I.
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Derib, S.D.
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Deneke, T.T.
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McCartney, Matthew P.
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Otto, B. A.
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Billa, S.S.
,
[Digging, damming or diverting?: small-scale irrigation in the Blue Nile Basin, Ethiopia.]
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Digging, damming or diverting?: small-scale irrigation in the Blue Nile Basin, Ethiopia.
Large-scale estimates of the area of terrestrial surface waters have greatly improved over time, in particular through the development of multi-satellite methodologies, but the generally coarse spatial resolution (tens of kms) of global observations is still inadequate for many ecological applica...
Fluet-Chouinard, E.
,
Lehner, B.
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Rebelo, Lisa-Maria
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Papa, F.
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Hamilton, S.K.
,
[Development of a global inundation map at high spatial resolution from topographic downscaling of coarse-scale remote sensing data]
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Development of a global inundation map at high spatial resolution from topographic downscaling of coarse-scale remote sensing data