全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
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作者:Mona Forsman , Niclas Börlin , Johan Holmgren
来源:[J].Forests(IF 1.094), 2016, Vol.7 (3)DOAJ
摘要:We propose a novel photogrammetric method for field plot inventory, designed for simplicity and time efficiency on-site. A prototype multi-camera rig was used to acquire images from field plot centers in multiple directions. The acquisition time on-site was less than two min...
作者:Mona Forsman , Johan Holmgren , Kenneth Olofsson
来源:[J].Forests(IF 1.094), 2016, Vol.7 (9)DOAJ
摘要:Diameter at breast height has been estimated from mobile laser scanning using a new set of methods. A 2D laser scanner was mounted facing forward, tilted nine degrees downwards, on a car. The trajectory was recorded using inertial navigation and visual SLAM (simultaneous localiza...
作者:Kenneth Olofsson , Johan Holmgren , Håkan Olsson
来源:[J].Remote Sensing(IF 2.101), 2014, Vol.6 (5), pp.4323-4344DOAJ
摘要:Terrestrial laser scanning is a promising technique for automatic measurements of tree stems. The objectives of the study were (1) to develop and validate a new method for the detection, classification and measurements of tree stems and canopies using the Hough transformation and...
作者:... Thomas Hellström , Johan Holmgren , Ola Lindroos
来源:[J].Remote Sensing(IF 2.101), 2013, Vol.5 (10), pp.4839-4856DOAJ
摘要:Accurate vehicle localization in forest environments is still an unresolved problem. Global navigation satellite systems (GNSS) have well known limitations in dense forest, and have to be combined with for instance laser based SLAM algorithms to provide satisfying accuracy. Such ...
作者:... Kenneth Olofsson , Johan Holmgren , Eva Lindberg
来源:[J].Remote Sensing(IF 2.101), 2013, Vol.5 (4), pp.1932-1955DOAJ
摘要:Individual tree crowns may be delineated from airborne laser scanning (ALS) data by segmentation of surface models or by 3D analysis. Segmentation of surface models benefits from using a priori knowledge about the proportions of tree crowns, which has not yet been utilized f...
作者:Johan Holmgren , Zoi Nikopoulou ...
来源:[J].Transportation Research Part D(IF 1.291), 2014, Vol.28, pp.62-73Elsevier
摘要:Abstract(#br)The implementation of MARPOL Annex VI in the North and Baltic Sea Sulphur Emission Control Area (SECA) has raised economic concerns among shippers and shipowners, as well as spurred policymakers to appeal to various interests, such as citizen health, export indu...
作者:Johan Holmgren , Johan E.S. Fransson
来源:[J].International Journal of Applied Earth Observations and Geoinformation(IF 2.176), 2014, Vol.30, pp.21-29Elsevier
摘要:Abstract(#br)In this study, a method has been developed for the detection of windthrown trees under a forest canopy, using the difference between two elevation models created from the same high density (65 points/m 2 ) airborne laser scanning data. The difference image showi...
作者:Johan Holmgren , Paul Davidsson ...
来源:[J].Simulation Modelling Practice and Theory(IF 1.159), 2012, Vol.23, pp.1-18Elsevier
摘要:Abstract(#br)We present the Transportation And Production Agent-based Simulator (TAPAS), which is an agent-based model for simulation of transport chains that can be used, e.g., for analysis of transport-related policy and infrastructure measures. TAPAS is more powerful than trad...

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