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ISPRS International Journal of Geo-Information, Volume 12, Issue 2

February 2023 - 57 articles

Cover Story: The performance of a machine learning algorithm depends on the underlying data representation. Geospatial data come in many different shapes and forms, including points of interest, boundaries, trajectories, images and many more. To maximise the performance of the machine learning algorithms operating on such data, they should be converted into a representation that encodes the semantics by mapping similar entities to similar representations. Self-supervised representation learning (SSRL) performs this task automatically without the need for expensive data annotation. This article reviews the existing research literature on SSRL in the field of geographical information science and discusses different types of representations learnt, SSRL models used, downstream applications, and performance improvements. View this paper
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Articles (57)

  • Article
  • Open Access
2 Citations
3,712 Views
20 Pages

A Contour Line Group Simplification Method Based on Classified Terrain Features

  • Yuanfu Li,
  • Qun Sun,
  • Wenyue Guo,
  • Qing Xu and
  • Xinming Zhu

Contour line group simplification methods can effectively preserve terrain features during map making and producing. This process involves two main steps, namely terrain feature line extraction and contour bend selection. The terrain feature line ext...

  • Article
  • Open Access
6 Citations
4,235 Views
21 Pages

Smart City (SC) strategies developed by local governments reflect how governments and planners envision SC and apply smart technologies, and what challenges they face and try to address. Little attention, however, has been given to investigating SC s...

  • Feature Paper
  • Article
  • Open Access
6 Citations
4,139 Views
29 Pages

Toponymy, a transversal discipline for geography, linguistics, and history, finds one of its main supports in cartography. Due to exhaustiveness on the territory, cadastral cartography and its toponymy have the ideal characteristics to develop system...

  • Article
  • Open Access
1 Citations
2,871 Views
19 Pages

The outbreak of COVID-19 in Beijing has been sporadic since the beginning of 2022 and has become increasingly severe since October. In China’s policy of insisting on dynamic clearance, fine-grained management has become the focus of current epi...

  • Article
  • Open Access
4 Citations
6,312 Views
20 Pages

Overview of Lightning Trend and Recent Lightning Variability over Sri Lanka

  • Vindhya Kalapuge,
  • Dilaj Maduranga,
  • Niranga Alahacoon,
  • Mahesh Edirisinghe,
  • Rushan Abeygunawardana and
  • Manjula Ranagalage

The study was conducted to analyze spatial and temporal variations of lightning activity over Sri Lanka and the surrounding coastal belt region bounded by 5.75–10.00 N and 79.50–89.00 E. Flash data collected by the Lightning Imaging Senso...

  • Review
  • Open Access
4 Citations
4,690 Views
18 Pages

Self-supervised representation learning (SSRL) concerns the problem of learning a useful data representation without the requirement for labelled or annotated data. This representation can, in turn, be used to support solutions to downstream machine...

  • Article
  • Open Access
15 Citations
4,493 Views
26 Pages

Natural hazards are increasingly threatening our communities; hence it is imperative to provide communities with reliable information on possible impacts of such disasters, and on resilience measures that can be adopted to recover from disasters. To...

  • Article
  • Open Access
4 Citations
3,096 Views
17 Pages

Influencing Pedestrians’ Route Choice Using Route Shape Simplification

  • Peng Ti,
  • Ruyu Dai,
  • Fangyi Wan,
  • Tao Xiong,
  • Hao Wu and
  • Zhilin Li

Pedestrians’ route choice is critical for several purposes, while deliberately changing map representations can influence map users’ route choice. Simplifying routes’ geometric shapes is one way to achieve this. However, the other g...

  • Article
  • Open Access
2 Citations
2,502 Views
6 Pages

Map projections are usually interpreted by mapping a sphere onto an auxiliary surface, and then the surface is developed into a plane. It is taken as a fact without proof that the parallels in which the auxiliary surface intersects the sphere are map...

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ISPRS Int. J. Geo-Inf. - ISSN 2220-9964