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Analyzing the Impact of the Different Instances of the Copernicus DEM Dataset on the Orthorectification of Vhr Optical Data | IEEE Conference Publication | IEEE Xplore

Analyzing the Impact of the Different Instances of the Copernicus DEM Dataset on the Orthorectification of Vhr Optical Data


Abstract:

This work was conceived to analyze the impact of the different instances of the Copernicus DEM (CopDEM) dataset (named: EEA-10, GLO-30, GLO-90) on the orthorectification ...Show More

Abstract:

This work was conceived to analyze the impact of the different instances of the Copernicus DEM (CopDEM) dataset (named: EEA-10, GLO-30, GLO-90) on the orthorectification of Very High Resolution (VHR) optical data (spatial resolution: 2–4 m). Indeed, the CopDEM instances are characterized by different pixel sizes/spatial coverages/licenses (EEA-10: 10&12 m/European/restricted; GLO-30: 30 m/global/public; GLO-90: 90 m/global/public). Findings showed that all the CopDEM instances provided valuable topographic information that allows reaching similar values of geolocation accuracy. The latter is only slightly influenced by the different pixel sizes of the data. Moreover, this research provided valuable insights related to the existing relationships between the geolocation accuracy and: i) the spatial resolution of the VHR input products; ii) the orography and land cover of the target areas. The analysis also highlighted the importance of the GLO-30 instance for orthorectification purposes, as it is freely and globally available.
Date of Conference: 17-22 July 2022
Date Added to IEEE Xplore: 28 September 2022
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Conference Location: Kuala Lumpur, Malaysia

1. Introduction

Topographic data are an important source of information for the processing of Earth Observation (EO) products and, thus, for developing reliable EO-based services. Within this context, the Copernicus Programme made the important effort of making available a high-quality topographic dataset that can be used as harmonized elevation reference for downstream applications: i.e., the Copernicus Digital Elevation Model (DEM), also known as CopDEM dataset. The latter is a digital surface model (DSM) mainly obtained from the X-band, SAR-derived WorldDEM dataset and locally infilled by other elevation data, like ALOS AW3D30, ASTER GDEM, SRTM etc. (e.g., for gap filling). In order to ensure the CopDEM dataset homogeneity, these data underwent a thorough editing and quality assurance process. Although the WorldDEM is a proprietary product that has a spatial resolution of 0.4 arc seconds (ca. 12 m) and a global coverage, the derived CopDEM dataset is distributed via products that have been processed and resampled to have different pixel sizes (i.e., ca. 10 m, 12 m, 30 m and 90 m), different spatial coverages (i.e., European and global) and different licenses. These different formats of the CopDEM dataset products are defined instances. For example, the 10-and 12-meters products (both referred together as EEA-10 instance; but hereinafter simply individually called EEA-10m and EEA-12m instance, respectively) are available over the European area (i.e., EEA-39 area). The exploitation of EEA-10 data is restricted to eligible users. The EEA-12m instance is the one more similar to the original WorldDEM product. The 30-meters and the 90-meters instances (named GLO-30 and GLO-90, respectively) are available worldwide with a free license (i.e., free, full and open data policy) [1].

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