JSA FAQ: Product grouping types

When you search the CADC archive for processed data (either public or proprietary), you will have the option selecting any of four different types of product. These are:

1. Simple: This is the most processed state of a single observation
2. Night: This is the product resulting from all observations taken in one night on the same field
3. Multi-night: This is the product resulting from all observations taken in one field, even if they were taken on different nights. We sometimes call this the "project" co-add, because once observing for that project is finished, it represents all the (groupable) data taken for the project in that field
4. Public: This is a product consisting of all public observations of a particular field, even if they were taken for multiple projects. At this time, we have not generated any products of this type.

We sometimes refer to the simple product as the "obs" product (after the filename suffix that you will get when you download it). We also refer to products 2-4 as "aggregate" products, because they consist of more than one observation. You should always get an obs product for each observation in your project; aggregate products are made excluding any observations marked as bad.

Here's where you can find this option in  the JCMT Science Archive: