Added a shell script that ingests an image catalog and creates a logi…

…cal folder hierarchy to the image files.

- Ingests a CSV image catalog containing the filepath, projection, resolution, and color model fields
- Creates a folder hierarchy representing unique combinations of color, projection and scale
- Populates the folder hierarchy with symbolic links to the files in the image catalog

scripts/mosaics/process_image_catalog.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+## Must run with bash shell to used variable substitution: "${var//pattern/substituion}"
+
+set -x
+
+# Set the source image catalog CSV file: filename;projcs;geogcs;resolution;color
+input=image_catalog.csv
+
+# Process the input file.
+#   Note: IFS is a special shell variable: the "Internal Field Separator" used by read
+while IFS=\; read filename projection resolution color; do
+
+    # Skip the header row
+    if [ "$filename" = "filepath" ]; then
+        continue
+    fi
+
+    # Get the file name components
+    dirname=$(dirname $filename)
+    basename=$(basename $filename)
+    auxname=${basename}.aux.xml
+
+    # Define the filepath where the categorized image (link) will be stored
+    folder=${projection}"/"${color}"/"${resolution}
+
+    # Create the folder hierarchy
+    if [ ! -d $folder ]; then
+        mkdir -p $folder
+    fi
+
+    # Create a symbolic link to the image in the folder
+    ln -s $filename $folder/$basename
+    ln -s $dirname/$auxname $folder/$auxname
+
+done < "$input"