Noel Dyer's research while affiliated with University of Maryland, College Park and other places

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Publications (7)

Chart features, data quality, and scale in cartographic sounding selection from composite bathymetric data
Article
Full-text available
  • Oct 2023
Cartographic sounding selection is a constraint-based bathymetric generalization process for identifying navigationally relevant soundings for nautical chart display. Electronic Navigational Charts (ENCs) are the premier maritime navigation medium and are produced according to international standards and distributed around the world. Cartographic g...
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Figure 1. Workflow for the compilation of the products ("charts").
Figure 2. Summary of the Hydrographic Sounding Selection [32].
Figure 3. Surface critical point representation [32].
Figure 4. Sample S-101 portrayal symbols used for the ENC-like (VNM)...
+15 Figure 5. The two test sites of Thunder Bay and Ottawa River in Canada.
Increasing Efficiency of Nautical Chart Production and Accessibility to Marine Environment Data through an Open-Science Compilation Workflow
Article
Full-text available
  • Mar 2023
Electronic Navigational Chart (ENC) data are essential for safe maritime navigation and have multiple other uses in a wide range of enterprises. Charts are relied upon to be as accurate and as up-to-date as possible by the vessels moving vast amounts of products to global ports each year. However, cartographic generalization processes for updating...
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Figure. Example of current workflow.
Towards an automated chart-ready cartographic sounding selection
Conference Paper
Full-text available
  • Jun 2022
Cartographic sounding selection, the process of identifying navigationally relevant soundings for chart-display, is a time-consuming generalization process in the chart production workflow. Advances in bathymetric data collection and processing techniques are resulting in higher resolution data, which compounds the bottleneck of sounding selection....
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The 2014-17 Global Coral Bleaching Event: The Most Severe and Widespread Coral Reef Destruction
Preprint
Full-text available
  • Apr 2022
Ocean warming is increasing the incidence, scale, and severity of global-scale coral bleaching and mortality, culminating in the third global coral bleaching event that occurred during record marine heatwaves of 2014-2017. While local effects of these events have been widely reported, the global implications remain unknown. Analysis of 15,066 reef...
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Figure 1. Workflow from source bathymetry to ENC.
Figure 2. Example smooth-sheet (Putnam, 2013).
Figure 3. Common generalization approaches: a) radius-based and b)...
Figure 4. Over-and under-generalization as a result of the radius-based...
+9 Figure 5. Vertical profile of seabed and the selection with grid-(a, b)...
Label-based generalization of bathymetry data for hydrographic sounding selection
Article
Full-text available
  • Jan 2022
This work presents a novel shoal-bias, label-based generalization algorithm that utilizes the physical dimensions of the symbolized depth values on charts to avoid the over-plot of depth labels at scale. Additionally, validation tests based on cartographic constraints for nautical charting are implemented to compare the results of the proposed algo...
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Figure: Sounding label distributions of generalization approaches: A)...
Sounding Labels and Scale for Bathymetric Data Generalization in Nautical Cartography
Conference Paper
Full-text available
  • Sep 2021
This work presents a bathymetric data generalization algorithm based on depth labels rendered at scale. It aims to facilitate the final cartographic sounding selection for chart portrayal through the process referred to as hydrographic sounding selection. Currently, automated algorithms for hydrographic soundings selection rely on radius-and grid-b...
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Citations

... When a depth contour overlaps a sounding label, for example, the contour may be displaced around the label to maintain readability, but the sounding cannot be displaced. On the other hand, overlaps between depth contours and soundings are easier to distinguish than two overlapping sounding labels (Kastrisios et al. 2023). Therefore, there is not only a hierarchy for cartographic constraints, but also for feature types, which demonstrates the complementary nature between features such as soundings and depth contours and why additional ENC features are required during sounding selection as well as the complexity of the problem. ...
Reference: Chart features, data quality, and scale in cartographic sounding selection from composite bathymetric data
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... Sounding selection, for example, is the identification of spot depths for a nautical chart. Only an algorithm cognizant of other charted bathymetric features (e.g., wrecks, rocks, obstructions, depth curves), as well as the final cartographic model, may yield acceptable outputs [15,32]. When the relevant chart features and/or the cartographic model (e.g., sounding label size and dimensions) are not considered by the automation algorithm, the adjustments that the cartographers must make may lead to a considerably different sounding selection, consequently, reducing their trust on the tool. ...
Reference: Increasing Efficiency of Nautical Chart Production and Accessibility to Marine Environment Data through an Open-Science Compilation Workflow
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... Coral reef ecosystems have rich biodiversity and high productivity, but they are vulnerable to various environmental stressors induced by climate change (Bellwood et al., 2004). Abnormally high sea temperature is one of the most serious threats affecting coral reefs and it can lead to frequent large-scale coral bleaching and coral degradation in various regions of the world (Skirving et al., 2019;Eakin et al., 2022). The thermal stress indicators developed using sea surface temperature (SST) are often used in thermal stress intensity evaluation and coral bleaching alerts (Liu et al., 2014;Zuo et al., 2015;Qin et al., 2023). ...
Reference: Deriving fine-scale patterns of sea surface temperature in coral reef habitats using the Landsat 8 thermal infrared sensor
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... Sounding selection can be separated into two categories: hydrographic and cartographic. Hydrographic sounding selection is the process of generalizing bathymetry data to produce a shoal-biased, less dense, and more manageable subset of soundings to facilitate the subsequent cartographic selection (Dyer, Kastrisios, and De Floriani 2022;MacDonald 1984;Oraas 1975;Zoraster and Bayer 1992). Cartographic sounding selection is the identification of soundings for chart display. ...
Reference: Chart features, data quality, and scale in cartographic sounding selection from composite bathymetric data
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