A methodology for creating analytical hill-shading by combining different lighting directions

Loissios, Dimitrios; Tzelepis, Nikolaos; Nakos, Byron

dc.contributor.author	Loissios, Dimitrios	en
dc.contributor.author	Tzelepis, Nikolaos	en
dc.contributor.author	Nakos, Byron	en
dc.date.accessioned	2021-03-11T13:07:15Z
dc.date.available	2021-03-11T13:07:15Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/53030
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.20728
dc.rights	Default License
dc.subject	Hill Shading	en
dc.title	A methodology for creating analytical hill-shading by combining different lighting directions	en
heal.type	conferenceItem
heal.classification	Cartography	en
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2007-08-04
heal.bibliographicCitation	Loissios, Dimitrios & Tzelepis, Nikolaos & Nakos, Byron. (2007). A methodology for creating analytical hill-shading by combining different lighting directions. Proceedings of the 23rd International Cartographic Conference, pp. 4-10.	en
heal.abstract	The present study examines ways of creating analytical hill-shaded images by applying more than one light sources, in order to eliminate, at a certain degree, two deficiencies present in single lighted hill-shaded images. The first deficiency is related to the insufficient representation of the total number of relief formations, due to many different main massif directions in mountainous terrains and the second one to the existence of deep dark shading tones, which make difficult either to detect the slight relief changes, or even to legibly read the superimposed cartographic symbols. An initial hill-shaded image is generated by applying a north-west light direction and is partly replaced by the enhanced weighted combination of the shading images derived from certain other lighting directions, where the amount of partial replacement depends on the incident angle. This methodology aims to achieve a more balanced result of hill-shading, in such a way that the perception of the initial optimal lighting is preserved, as well as, the major relief forms in all directions are revealed or even sharper local details are enhanced.	en
heal.fullTextAvailability	true
heal.conferenceName	23rd International Cartographic Conference	en
heal.conferenceItemType	full paper