Drone‐based structure‐from‐motion photogrammetry captures grassland sward height variability
نویسندگان
چکیده
منابع مشابه
Validation of Ps Height Estimates by Means of Photogrammetry
The Permanent Scatterers (PS) technique is an operational tool in the context of spaceborne SAR interferometry for monitoring the displacement of radar targets with millimetric accuracy. Recently, the target localization capability of the PS technique has been subject of study and the possibility of generating DEM’s and DTM’s by means of the height of a sparse set of points has been evaluated. ...
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In the framework of the Joint Archaeological Mission of the Universities of Bologna and Lecce at the ancient town of Soknopaiou Nesos (Fayyum, Egypt) a wide-range of geomatic methodologies were experimented (GPS, total station surveys, low-height aerial and close-range photogrammetry, Visual Reality ecc.). The surveys were conducted with the aim of recording metrical and nonmetrical information...
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Grazing pastures to low post-grazing sward heights (PGSH) is a strategy to maximise the quantity of grazed grass in the diet of dairy cows within temperate grass-based systems. Within Irish spring-calving systems, it was hypothesised that grazing swards to very low PGSH would increase herbage availability during early lactation but would reduce dairy cow performance, the effect of which would p...
متن کاملTiming of climate variability and grassland productivity.
Future climates are forecast to include greater precipitation variability and more frequent heat waves, but the degree to which the timing of climate variability impacts ecosystems is uncertain. In a temperate, humid grassland, we examined the seasonal impacts of climate variability on 27 y of grass productivity. Drought and high-intensity precipitation reduced grass productivity only during a ...
متن کاملDoes sward height affect feeding patch choice and voluntary intake in horses?
The numbers of horses grazing at pasture are increasing in developed countries, so a proper understanding of their feeding selectivity and of the tactics they use for extracting nutrients from swards is essential for themanagement of horses and grasslands. Resource acquisition in herbivores can be optimised through the modulation of their intake and patch selection both being strongly dependent...
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ژورنال
عنوان ژورنال: Journal of Applied Ecology
سال: 2018
ISSN: 0021-8901,1365-2664
DOI: 10.1111/1365-2664.13148