Gridding artifacts on ENVISAT/MERIS temporal series

L. Gómez Chova, R. Zurita-Milla, L. Alonso, L. Guanter, J. Amoros-Lopez, G. Camps-Valls, J. Moreno

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Earth observation satellites are a valuable source of data that can be used to better understand the Earth system dynamics. However, analysis of satellite image time series requires an accurate spatial co-registration so that the multi-temporal pixel entities offer a true temporal view of the study area. This implies that all the observations must be mapped to a common system of grid cells (gridding).
Two common grids can be defined as a reference: (1) a grid defined by an external dataset in a given coordinate system or (2) a grid defined by one of the images of the time series. The aim of this paper is to study the impact that gridding has on the quality of ENVISAT/MERIS image time series, which is quantified using a time series of images acquired over The Netherlands. First, the impact of the reference map grid selection is evaluated in terms of geolocation errors and pixel overlap. Then, the effect of observation geometry (due to the fact that images are acquired from slightly different orbits) is studied. Results show that it is of paramount importance to identify areas with small pixel overlap in order to further analyze the reliability of the products derived from these areas.
Original languageEnglish
Title of host publicationProceedings of ESA Living Planet Symposium, 28 June-2 July 2010, Bergen, Norway
EditorsH. Lacoste-Francis
PublisherEuropean Space Agency (ESA)
Number of pages8
ISBN (Print)978-92-9221-250-6
Publication statusPublished - 2010
EventESA Living Planet Symposium 2010 - Bergen, Norway
Duration: 28 Jun 20102 Jul 2010

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ConferenceESA Living Planet Symposium 2010


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