Automatic determination of seamlines for aerial image mosaicking based on vector roads alone

Wan, Youchuan; Wang, Dongliang; Xiao, Jianhua; Lai, Xudong; Xu, Jin

doi:10.1016/j.isprsjprs.2012.11.002

Cited by 44 publications

(30 citation statements)

References 19 publications

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“…This procedure finds the optimal borders between the images and creates seams based on those borders, requiring an image overlapping of 40 to 70 %. Mosaicking minimizes misalignments, which are especially visible in borders of two contiguous images (Wan et al, 2013); the main advantages of this include image spatial continuity, allowing for coastline location on longer coastal stretches and facilitating the search for common ground control points (GPCs) (Verhoeven et al, 2012). Mosaics were georeferenced using GCPs that corresponded to common elements in both datasets, evenly distributed along the coastline.…”

Section: Mapping Proceduresmentioning

confidence: 99%

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Lira

Silva

Taborda

et al. 2016

Earth Syst. Sci. Data

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Abstract. Regional/national-scale information on coastline rates of change and trends is extremely valuable, but these studies are scarce. A widely accepted standardized methodology for analysing long-term coastline change has been difficult to achieve, but it is essential to conduct an integrated and holistic approach to coastline evolution and hence support coastal management actions. Additionally, databases providing knowledge on coastline evolution are of key importance to support both coastal management experts and users.The main objective of this work is to present the first systematic, national-scale and consistent long-term coastline evolution data of Portuguese mainland low-lying sandy coasts.The methodology used quantifies coastline evolution using a unique and robust coastline indicator (the foredune toe), which is independent of short-term changes.The dataset presented comprises (1) two polyline sets, mapping the 1958 and 2010 sandy beach-dune system coastline, both optimized for working at 1 : 50 000 scale or smaller; (2) one polyline set representing long-term change rates between 1958 and 2010, each estimated at 250 m; and (3) a table with minimum, maximum and mean of evolution rates for sandy beach-dune system coastline. All science data produced here are openly accessible at https://doi.pangaea.de/10.1594/PANGAEA.859136 and can be used in other studies.Results show beach erosion as the dominant trend, with a mean change rate of −0.24 ± 0.01 m year −1 for all mainland Portuguese beach-dune systems. Although erosion is dominant, this evolution is variable in signal and magnitude in different coastal sediment cells and also within each cell. The most relevant beach erosion issues were found in the coastal stretches of Espinho-Torreira and Costa Nova-Praia de Mira, Cova da Gala-Leirosa, and Cova do Vapor-Costa da Caparica. The coastal segments Minho River-Nazaré and Costa da Caparica adjacent to the coast exhibit a history of major human interventions interfering with the coastal system, many of which originated and maintained a sediment deficit. In contrast, the coastal segments Troia-Sines and SinesCape S. Vicente have experienced less intervention and show stable or moderate accretion behaviour.

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Section: Mapping Proceduresmentioning

confidence: 99%

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Lira

Silva

Taborda

et al. 2016

Earth Syst. Sci. Data

View full text Add to dashboard Cite

show abstract

“…The latter option not only prevents seamlines from crossing objects like buildings or fields (cf. Saito et al, 2015), but also adjusts them to linear features like roads and rails (Wan et al, 2013).…”

Section: Seamline Optimizationmentioning

confidence: 99%

“…Consequently, merging remote sensing images into a single homogeneous composite has become an increasingly important task, often referred to as "mosaicking" in recent literature (cf. Li et al, 2016;Yu et al, 2012;Wan et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Mosaicking Mexico - The Big Picture of Big Data

Hruby

Melamed

Ressl

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The project presented in this article is to create a completely seamless and cloud-free mosaic of Mexico at a resolution of 5m, using approximately 4,500 RapidEye images. To complete this project in a timely manner and with limited operators, a number of processing architectures were required to handle a data volume of 12 terabytes. This paper will discuss the different operations realized to complete this project, which include, preprocessing, mosaic generation and post mosaic editing. Prior to mosaic generation, it was necessary to filter the 50,000 RapidEye images captured over Mexico between 2011 and 2014 to identify the top candidate images, based on season and cloud cover. Upon selecting the top candidate images, PCI Geomatics' GXL system was used to reproject, color balance and generate seamlines for the output 1TB+ mosaic. This paper will also discuss innovative techniques used by the GXL for color balancing large volumes of imagery with substantial radiometric differences. Furthermore , post-mosaicking steps, such as, exposure correction, cloud and cloud shadow elimination will be presented.

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“…As streets are dominant infrastructures dividing large landscapes, and as reflectivity of concrete remains quite stable under different illumination conditions, highlighting such areas in the gradient image leads to even better results (Wan et al 2013). During the last decade volunteered geographic information (VGI) is used in a broad range of applications.…”

Section: Based On Additional External Geo-information Datamentioning

confidence: 99%

Towards Fast Morphological Mosaicking of High-Resolution Multi-Spectral Products – On Improvements of Seamlines

Storch¹,

Fischer²,

Fast³

et al. 2016

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:The complex process of fully automatically establishing seamlines for the fast production of high-quality mosaics with high-amount of high-resolution multi-spectral images is detailed and improved in this paper. The algorithm is analyzed and a quasi-linear runtime in the number of considered pixels is proven for all situations. For typical situations the storage is even essentially smaller from a complexity theoretical perspective. Improvements from algorithm practical perspective are specified, too. The influence of different methods for the determination of seamlines based on gradients is investigated in detail for three Sentinel-2 products. The studied techniques cover well-known ones normally based on a single band. But also more sophisticated techniques based on multiple bands or even taking additional external geo-information data are taken into account. Based on the results a larger area covered by Image2006 orthorectified products with data of the Resourcesat-1 mission is regarded. The feasibility of applying advanced subordinated methods for improving the mosaic such as radiometric harmonization is examined. This also illustrates the robustness of the improved seamline determination approaches.

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Automatic determination of seamlines for aerial image mosaicking based on vector roads alone

Cited by 44 publications

References 19 publications

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Coastline evolution of Portuguese low-lying sandy coast in the last 50 years: an integrated approach

Mosaicking Mexico - The Big Picture of Big Data

Towards Fast Morphological Mosaicking of High-Resolution Multi-Spectral Products – On Improvements of Seamlines

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