You must have the LSST Stack installed on your system (see LSST Stack Installation) to proceed. The commands listed in the code blocks below primarily assume you are using the bash shell; analogous commands for (t)csh should work as well. If you have not already done so, load the LSST environment: where
Load the LSST Environment
$INSTALL_DIR is the directory where the LSST Stack was installed.
You must have the LSST Stack installed on your system (see LSST Stack Installation) to proceed. The commands listed in the code blocks below primarily assume you are using the bash shell; analogous commands for (t)csh should work as well. If you have not already done so, load the LSST environment:
Use the eups setup command to enable the packages you intend to use, which likely includes the LSST pipelines. You should typically specify a version tag to ensure that all enabled packages are consistent.
To assure stability in your stack, you may save exactly which versions you are using for subsequent setups to a file. If the stack is later updated you can continue using the older versions. If you fail to do this you may find that your procedures stop working. But if you are just using a released version tag (or any other tag) with no customized versions, this is probably overkill.
Note that the available command-line options for resident tasks of packages that have been "setup" can be invoked with the
--help switch on the command line.
Some of the tutorials provide scripts, configuration files, or other information that you will need to exercise the examples. These have been collected in a tutorials package in the LSST Code Repositories, which you fetch with:
The following tutorials illustrate how to use the LSST Stack for processing images, and (eventually) how to craft your own simple pipelines using software components from the Stack.
Basic LSST Demo
This first, very simple example is used to verify the proper installation of the LSST Stack. See Testing the Installation.
Process a Single File on Disk
The next simple tutorial shows how to process a single image and generate a catalog of detected sources. See Processing a Single Image File.
Process PhoSim Images
This next, more complicated example shows how to generate LSST image simulations using the PhoSim software, followed by image processing and catalog generation. See the PhoSim processing tutorial for details.
Process SDSS Stripe 82 Images
The SDSS images from Stripe 82 have been used in Data Release Productions to test scientific performance of the LSST Stack. The standard DRP (lite) processing is quite involved: see the SDSS processing tutorial.
Analysis with the Stack
Example Queries on Output Catalogs
Once images are processed, analysis of the resulting output catalog(s) is a logical next step. The catalog query examples can be customized to your science needs.
The LSST Stack includes a base of algorithmic code that is well suited to image and catalog analysis. Some of the Science Data Quality Assurance tasks are based on it. For a quick introduction to the capabilities, see the on-line tutorials by Chris Walter (Duke Univ.) of the DESC. The notebooks are the following:
- Introductory page
- Basic Operations (introduction to afw)
- Table and Catalog Introduction
- Command-line Tasks
Note that these notebooks can be edited (e.g. if you see something out of date), and new additions are welcome.