E.g. --combine Elevation_1_5 should print an error message
[ ] The --combine option only checks the dataset to be valid. The component selector check is to see if it is a number and ignore if it doesn't exist. We should error out upfront to let client know if the CS doesn't exist
[ ] Update the dataset table in the README to indicate which dataset and component selectors are supported
E.g.
--combine Elevation_1_5should print an error message--combineoption only checks the dataset to be valid. The component selector check is to see if it is a number and ignore if it doesn't exist. We should error out upfront to let client know if the CS doesn't exist