Accurate registration of optical satellite imagery with elevation models for topographic correction

Autor:	Sam Gillingham, James D. Shepherd, Peter Bunting, John R. Dymond
Rok vydání:	2014
Předmět:	Mountainous terrain Offset (computer science) Pixel Earth and Planetary Sciences (miscellaneous) Satellite imagery Electrical and Electronic Engineering Digital elevation model Ghosting Reflectivity Topographic correction Geology Remote sensing
Zdroj:	Remote Sensing Letters. 5:637-641
ISSN:	2150-7058 2150-704X
DOI:	10.1080/2150704x.2014.950761
Popis:	It is necessary to remove the effects of topography from optical satellite imagery if automated techniques are to be used to infer surface properties. This is especially the case in mountainous terrain where variable slope normals cause variation in both illumination and reflectance of light. Digital elevation models (DEMs) are required to model slope normals and make topographic corrections. However, it is difficult to achieve accurate registration between ortho-rectified satellite images and DEMs. We show how this mis-registration, which can be spatially variable, may be accounted for with the use of a local correlation filter. The filter determines the offset between a DEM shade map and ortho-rectified satellite image for every pixel. Association of satellite image pixels with the ‘correct’ slope normal in topographic correction removes the majority of ghosting and high-frequency artefacts.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5bb92d427de9e61a927e3267b80921c0 https://doi.org/10.1080/2150704x.2014.950761 Zobrazit plný text záznamu