AWS OpenData

MP data is also available through the AWS OpenData Program.

In an effort to make our data as accessible as possible (FAIR principle) as well as significantly improve data downloads and take pressure off our servers, we are making a growing list of our data products available through the AWS OpenData Program. Also see the entries for MP-managed data on the AWS OpenData Registry or the AWS Data Exchange. Usage of all data provided through our API or directly through OpenData is subject to our terms.

Overview

MP data is organized in 3 buckets named materialsproject-{raw,parsed,build}. Note that the particular organization of our data in these buckets is still in flux and can change without notice as we integrate them into our cloud infrastructure.

raw data

We are in the process of providing VASP output files for our calculations in the raw bucket. Look out for announcements through our email lists and notifications on our website.

parsed data

The parsed bucket contains objects that MP generates by parsing the VASP output files. The objects form the basis for our builder pipelines which create the derived high-level data collections served through the MP API and website. All S3 objects in this bucket are serialized pymatgen or emmet python objects and most are stored as gzip-compressed JSON files for each MP ID (i.e. <prefix>/<mp-id>.json.gz). We are in the process of grouping documents into JSON Lines (JSONL) files to reduce the number of files and significantly improve transfer speeds. tasks are now organized by nelements/output.spacegroup.number and a timestamp (dt) derived from the earliest completed_at in the list of tasks included in the respective object. The latest set of tasks is in the /tasks_atomate2prefix (see database changelog for details).

prefix	# objects	size
/dos	692k	63.2 GB
/bandstructures	705k	1.5 TB
/chgcars	415k	7.7 TB
/aeccar{0,1,2}s	138.8k each	1.1 TB each
/elfcars	107.5k	101 GB
/locpots	158k	2.5 TB
/tasks	1556	34 GB
/tasks_atomate2	1286	28 GB

build data

The build bucket contains the high-level derived data that comprises the source for the collections available through the MP API as well as pre-built objects and images for efficient visualization on the website.

The collections and pre-built objects are versioned by the database release date and individual documents grouped into gzip-compressed JSONL files. Images are stored in PNG format. Use the ls command for the AWS CLI or the bucket explorer to list the categories available under each prefix (see download section below).

prefix	version	# objects	size
/collections	/2022-10-28	12.6k	2.8 GB
	/2023-11-01	18.4k	6.1 GB
	/2024-11-14	213k	83 GB
/objects	/2022-10-28	289k	55.9 GB
/images	N/A	200k	58 GB

Explore & Download Data

The mp-api python client internally uses direct downloads from the OpenData repositories to improve convenience and efficiency. All data in MP's OpenData buckets can also be downloaded directly using the AWS CLI.

Start by exploring the contents of the bucket you're interested in, by either navigating to the bucket's web interface (e.g. https://materialsproject-parsed.s3.amazonaws.com/index.html) or using the CLI's ls command:

aws s3 ls --no-sign-request s3://<bucket>/<prefix>/[<version>]/

# examples
aws s3 ls --no-sign-request s3://materialsproject-parsed/
aws s3 ls --no-sign-request s3://materialsproject-build/
aws s3 ls --no-sign-request s3://materialsproject-build/collections/2022-10-28/
aws s3 ls --no-sign-request s3://materialsproject-build/images/

All objects for a prefix can be downloaded, using the format

# the AWS CLI will parallelize download requests automatically
aws s3 cp --no-sign-request --recursive s3://<bucket>/<prefix>/ <output-dir>/

# examples
aws s3 cp --no-sign-request --recursive s3://materialsproject-parsed/tasks/ mp-tasks/
aws s3 cp --no-sign-request --recursive \
    s3://materialsproject-build/images/structures/ mp-images-structures/