DAAC (Distributed Active Archive Center)

One of NASA’s 12 discipline-specific archive centers. Each curates, stores, and distributes data for a science area (land, ocean, cryosphere, atmosphere…).

Why it matters

NASA data isn’t in one place — it’s federated across DAACs by topic. The fragmentation is a 1990s organizational artifact, not a meaningful boundary for modern cross-discipline science.

Where you’ll meet it

• LP DAAC (Land Processes) hosts HLS and MODIS land products; PO.DAAC (Physical Oceanography) hosts sea-surface temperature and altimetry; NSIDC DAAC hosts SMAP soil moisture and cryosphere data.
• GES DISC serves GPM precipitation and atmospheric reanalysis — a single rainfall-plus-land-cover study can pull from GES DISC, LP DAAC, and NSIDC at once.
• When a CMR search returns granules, the result tells you which DAAC to download from; earthaccess handles the per-DAAC login (Earthdata Login) for you.
• The DAAC boundary mostly shows up as different download hosts and occasional format quirks — not as a limit on what you can combine.

In plain terms

Like specialist hospital departments — cardiology, neurology — except your science question often needs several at once.