Installing datasets

The dataset framework packages data in self-contained units that are intended to be easy to install for LSST Stack users. It is not necessary to install all datasets supported by ap_verify, only those you intend to use.

Prerequisites

The Dataset framework requires that the computer have version 13.0 or later of the LSST Stack (specifically, the obs packages and their dependencies) installed. Installing lsst_distrib is the simplest way to ensure all dependencies are satisfied.

The framework also requires Git LFS and the EUPS package management system. EUPS is included in the Stack installation.

Installation procedure

Use the LSST Software Build Tool to request the dataset by its package name. A list of existing datasets is maintained as part of this documentation. Because of their large size (typically hundreds of GB), datasets are never installed as a dependency of another package; they must be requested explicitly.

For example, to install the Cosmos PDR2 CI dataset,

rebuild -u ap_verify_ci_cosmos_pdr2

Once this is done, ap_verify will be able to find the Cosmos data when requested through --dataset.

Further reading

• Running ap_verify from the command line