Data Visualization and Geospatial Analysis With R
December, 2024
Chapter 1 Introduction
![](SampleData-master/images/cover_v3.png)
Taking examples from global satellite data in gridded/raster format
, we will demonstrate several common geospatial operations like projections
, resampling
, cropping
, masking
, spatial extraction
etc. using rasters, shapefiles, and spatial data frames. For a seamless analysis across different datatypes and platforms, conversion from/to different data formats like data frames, matrices, rasters, and structured data like NetCDF
will be discussed. Advanced topics will include working with data cubes (SpatRaster
), layer-wise operations on data cubes, cell-wise operations on raster time series by implementing user-defined functions with global
, app
, tapp
and lapp
. Parallel implementation of custom functions will be demonstrated for large-scale datasets.
Course level: Advanced. Prior experience in R required.
Materials: For this exercise, we will use global dataset from two NASA
satellites- MODIS for NDVI
and SMAP for surface (~5cm) soil moisture
.
We will use global aridity estimates (from [Global Aridity and PET Database] (https://cgiarcsi.community/data/global-aridity-and-pet-database/) as a general climate
classification (Hyper-arid, arid, semi-arid, sub-humid and humid).
The codes are tested on R version 4.2.3- Shortstop Beagle
and version 4.1.2 - Bird Hippie
.
To update, see section 5.2.
Instructors:
Vinit Sehgal is an Assistant Professor of Soil Physics at the LSU AgCenter, School of Plant, Environmental, and Soil Sciences. His research is deeply rooted in soil science and hydrology, focusing on the intricate dynamics of soil moisture and its critical role in agricultural and environmental sustainability.
Debasish Mishra is a PhD student in the Department of Biological & Agricultural Engineering at Texas A&M University. His research focuses on land-atmospheric interactions and its critical role in guiding ecosystem resilience.
Leah Kocian is a PhD student in the Department of Biological & Agricultural Engineering at Texas A&M University. Her research focuses on contaminant transport in Urban settings, particularly relating to carcinogens and micro-plastics.