README.md

EE720

Sample scripts for accessing and visualizing satellite remote sensing imagery

Download HLS V1.4 imagery

• Downloading HLS imagery using a bash shell script
  1. Select tile(s), and save them as a txt file into: e.g., ~/EE720/MSLSP/SCC/tileLists/cr_etc.txt
  2. Edit JSON file (~/EE720/MSLSP/MSLSP_Parameters.json) to set
     • Time range (L4 and 5): imgStarYr for starting year and imgEndYr for ending year
     • Pathways (L42-47)
  3. Open a shell script ~/EE720/MSLSP/SCC/MSLSP_submitTiles_SCC.sh, and make sure you assigned the right file paths for the JSON and txt files in the lines 4 and 5.
  4. Then, open terminal, go to ~/EE720/MSLSP/SCC/ using cd command, and submit the shell script on the current pathway by using this command ./MSLSP_submitTiles_SCC.sh
     • Before submitting the script, make sure whether the file is executable (you can do this by typing this chmod +x *.sh in the command line)
  5. Usually takes several hours (assigning a job to SCC, time for actual downloading, and depending on how many images (i.e., how many years of data) you requsted). Check the directory dataDir in the JSON file for images downloaded.

Open and visualize HLS V1.4 imagery

• HLS V1.4 imagery is archived into a format HDF [https://en.wikipedia.org/wiki/Hierarchical_Data_Format]
• Using an R package terra (or raster for older versions of R), we can easily handle HDF files
• A R script ~/EE720/MSLSP/Development/EE720_001.r is for a simple example of how to load and display HLS imagery on rstudio