A procedural footprint enhancement of global topographic surface with multiple levels of detail
Virtual globes are technologies for visual navigation through a three-dimensional, multi-resolution model of the entire planet. Data representations used in virtual globes, however, lack geometric flexibility at high-resolution levels of the planet-wide terrain surface. This is a problem especially...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2020-04-01
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| Series: | International Journal of Digital Earth |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/17538947.2018.1543362 |
| _version_ | 1797678566174883840 |
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| author | Lukáš Brůha Jan Kolář |
| author_facet | Lukáš Brůha Jan Kolář |
| author_sort | Lukáš Brůha |
| collection | DOAJ |
| description | Virtual globes are technologies for visual navigation through a three-dimensional, multi-resolution model of the entire planet. Data representations used in virtual globes, however, lack geometric flexibility at high-resolution levels of the planet-wide terrain surface. This is a problem especially if boundaries between individual geospatial features and the terrain are important. A novel integration of individual polygonal boundaries with a specific multi-resolution representation of the planet-wide terrain is developed in this article. In the preparation stage, the integration relies on an original simplification algorithm applied to the polygonal boundaries between geospatial features and the terrain. Its output is a multiple level-of-detail (LOD) geometry, which can be combined with a known multi-LOD representation of the terrain that uses run-time triangulation. This data representation is suitable for storage in existing database systems, avoids any data redundancy across LODs, and is even independent of the subdivision schema that partitions the planet's surface for the sake of dealing with LODs. At run-time, a novel reconstruction algorithm stitches geometric parts from different LODs together in a manner that augments the multi-LOD representation of the terrain. Within a certain proximity range from a given position, the method reconstructs a scene that preserves topological relations between the boundaries of geospatial features with the terrain. The method also guarantees that certain nearest proximity to the given position consists of the best geometries that correspond to the original datasets. Such properties of the method close up the gap between a mere exploratory visualization of static, pre-generated models and the models supporting geospatial analysis, which is deemed crucial for applications in Geographic Information Systems, Building Information Modelling and other software industries. A prototype implementation and experiment results that prove this method are also presented. |
| first_indexed | 2024-03-11T23:01:43Z |
| format | Article |
| id | doaj.art-916b7642722d4870bfa10d587111fc6e |
| institution | Directory Open Access Journal |
| issn | 1753-8947 1753-8955 |
| language | English |
| last_indexed | 2024-03-11T23:01:43Z |
| publishDate | 2020-04-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | International Journal of Digital Earth |
| spelling | doaj.art-916b7642722d4870bfa10d587111fc6e2023-09-21T14:57:08ZengTaylor & Francis GroupInternational Journal of Digital Earth1753-89471753-89552020-04-0113452754510.1080/17538947.2018.15433621543362A procedural footprint enhancement of global topographic surface with multiple levels of detailLukáš Brůha0Jan Kolář1Charles University in PragueGrifinor ProjectVirtual globes are technologies for visual navigation through a three-dimensional, multi-resolution model of the entire planet. Data representations used in virtual globes, however, lack geometric flexibility at high-resolution levels of the planet-wide terrain surface. This is a problem especially if boundaries between individual geospatial features and the terrain are important. A novel integration of individual polygonal boundaries with a specific multi-resolution representation of the planet-wide terrain is developed in this article. In the preparation stage, the integration relies on an original simplification algorithm applied to the polygonal boundaries between geospatial features and the terrain. Its output is a multiple level-of-detail (LOD) geometry, which can be combined with a known multi-LOD representation of the terrain that uses run-time triangulation. This data representation is suitable for storage in existing database systems, avoids any data redundancy across LODs, and is even independent of the subdivision schema that partitions the planet's surface for the sake of dealing with LODs. At run-time, a novel reconstruction algorithm stitches geometric parts from different LODs together in a manner that augments the multi-LOD representation of the terrain. Within a certain proximity range from a given position, the method reconstructs a scene that preserves topological relations between the boundaries of geospatial features with the terrain. The method also guarantees that certain nearest proximity to the given position consists of the best geometries that correspond to the original datasets. Such properties of the method close up the gap between a mere exploratory visualization of static, pre-generated models and the models supporting geospatial analysis, which is deemed crucial for applications in Geographic Information Systems, Building Information Modelling and other software industries. A prototype implementation and experiment results that prove this method are also presented.http://dx.doi.org/10.1080/17538947.2018.1543362feature-based topographymultiple level-of-detailprocedural modelingvector data organizationgeometry reconstruction |
| spellingShingle | Lukáš Brůha Jan Kolář A procedural footprint enhancement of global topographic surface with multiple levels of detail International Journal of Digital Earth feature-based topography multiple level-of-detail procedural modeling vector data organization geometry reconstruction |
| title | A procedural footprint enhancement of global topographic surface with multiple levels of detail |
| title_full | A procedural footprint enhancement of global topographic surface with multiple levels of detail |
| title_fullStr | A procedural footprint enhancement of global topographic surface with multiple levels of detail |
| title_full_unstemmed | A procedural footprint enhancement of global topographic surface with multiple levels of detail |
| title_short | A procedural footprint enhancement of global topographic surface with multiple levels of detail |
| title_sort | procedural footprint enhancement of global topographic surface with multiple levels of detail |
| topic | feature-based topography multiple level-of-detail procedural modeling vector data organization geometry reconstruction |
| url | http://dx.doi.org/10.1080/17538947.2018.1543362 |
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