2. Geospatial Data
2.A Geospatial data models
Outline:- raster and vector data models
- raster-vector conversions and resampling
- geospatial formats, conversions, geospatial data abstraction library
- data repositories
Lecture
Lecture slides: Geospatial data models
Supplemental materials:
- On-line geospatial data viewers and repositories
- Links to additional material on resampling
- Original lecture: Slides and videos: Raster Model, Vector Model, Raster-Vector Conversions.
Assignment part A: Geospatial data models, conversions, resampling
2.B Data display and visualization
Outline:- display of continuous and discrete data,
- use of color and shading to extract spatial patterns and relationships
- 3D visualization: single and multiple surfaces
- dynamic visualization
- tangible geospatial modeling
Lecture
Lecture slides: Geospatial data visualization
Supplemental materials:
- Visualization of global weather conditions
- Relief shading
- Colors:
- cpt-city (archive of color gradients),
- Sequential color scheme generator,
- ColorBrewer,
- Matplotlib colormaps reference
- Color for science
- Tangible Landscape (NCSU GeoForAll Lab project, see slides) and a book Petrasova, A. et al. 2018. Tangible Modeling with Open Source GIS. Second edition. Springer International Publishing.
- Cesium, an open source JavaScript library for 3D globes and maps
- Petrasova A. et al. 2019. Visualization of pedestrian density dynamics using data extracted from public webcams. ISPRS Int. Journal of Geo-Information 8 (12), 559
- Petras V. et al. 2017, Generalized 3D fragmentation index derived from lidar point clouds, Open Geospatial Data, Software and Standards 2(9), DOI: 10.1186/s40965-017-0021-8
- Original lecture: Slides and videos: Raster and Vector data display, Color, 3D visualization, 3D animation.
Assignment part B: Data display and visualization
- Approach: GRASS solution, ArcGIS Pro solution
- Screen captures for 3D visualization with 3D view (wxNVIZ) in GRASS GIS 6.4.3RC2 (similar to GRASS GIS 7 and 8, however, adding legend as in video II is not supported)
- Comments/answers to HW questions