3. Geospatial Analysis
3.A Global, zonal and neighborhood operations, map algebra
Outline:- global and zonal statistics, neighborhood operations
- raster map algebra
- expressions, operators, functions and variables
- basic calculations, integer and floating point data
- "if" conditions, handling NULLs and creating masks
- raster map patching and overlay
- raster map reclassification and rescaling
Lecture
Lecture slides: Neighborhood operations, map algebra
Supplemental materials:
- Statistical measures and related formulas
- Petras V. et al., 2017, Generalized 3D fragmentation index derived from lidar point clouds, DOI: 10.1186/s40965-017-0021-8, example of complex neighborhood operations on 2D and 3D raster
- Original lecture: Slides, videos: Global, Zonal, and Focal Statistics, Map Algebra and Reclassification.
Assignment part A
3.B Buffers, cost surfaces, least cost path
Outline:- measuring distance, proximity operators
- point, line, and area buffers
- cost surfaces, least cost path
Lecture
Lecture slides: Buffers, cost surfaces, least cost path
Supplemental materials:
- Trail Planning chapter from Petrasova et al., 2018, Tangible Modeling with Open Source GIS. Second edition. Springer. (NCSU Library link
- Topographic feature extraction using least cost path a chapter from Hardin et al. 2014,GIS-based Analysis of Coastal Lidar Time-Series, Springer Briefs in Computer Science, Springer, New York, 84 p. NCSU Library link Petrasova et al. 2017, Fusion of high-resolution DEMs for water flow modeling, DOI: 10.1186/s40965-017-0019-2, application of spatially variable buffer for DEM fusion.
- Firefighters escape route planning
- Fractals by Hausdorff dimension
- Original lecture: Slides and videos: Measuring distance, Buffers, Cost surfaces.