SANG-IL LEE - R Development

R Shiny Web Applications

Thiessen Polygon Maker

This application enables users to generate Thiessen polygons from their own point and boundary data, which can be uploaded as ESRI shapefiles or KML files.
Users can download the generated Thiessen polygons in ESRI shapefile format.
Link: https://sangillee.shinyapps.io/ThiessenPolygon/

Spatial Kernel Density Estimation

This application is designed to let users to create their own spatial kernel density estimation maps, sometimes called heat maps, on the internet.
It utilizes an R package, SpatialKDE, which is based on QGIS Heatmap tool.
Link: https://sangillee.shinyapps.io/SpatialKernelDensityEstimation/

R Packages

`salsa`

salsa stands for S and L for spatial autocorrelation. This is basically an R implementation of S and L statistics developed by me (Lee 2001, 2004, 2009).
It also includes other functions associated with spatial autocorrelation.
It is expected to be uploaded soon.

References

Lee, Sang-Il. 2001. “Developing a Bivariate Spatial Association Measure: An Integration of Pearson’s r and Moran’s I.” Journal of Geographical Systems 3 (4): 369–85. https://doi.org/10.1007/s101090100064.

———. 2004. “A Generalized Significance Testing Method for Global Measures of Spatial Association: An Extension of the Mantel Test.” Environment and Planning A: Economy and Space 36 (9): 1687–1703. https://doi.org/10.1068/a34143.

———. 2009. “A Generalized Randomization Approach to Local Measures of Spatial Association.” Geographical Analysis 41 (2): 221–48. https://doi.org/10.1111/j.1538-4632.2009.00749.x.