TalhaMah56/PACE_v3_1_part2

PACE OCI L2 AOP V3_1 pre-training corpus — part 2

This is the second half of one corpus. It was split across two repositories only because a single Hugging Face account ran out of storage. The shards never overlap, and the file layout and naming are identical, so you can merge the two repos by copying train/ and val/ from each into the same directory.

repository	holds
TalhaMah56/PACE_v3_1	train/shard_14503.tar … train/shard_24202.tar (9,700 shards). Full dataset card, measured limitations and provenance are there.
TalhaMah56/PACE_v3_1_part2 (this repo)	train/shard_00000–00359 (360 shards) and train/shard_24203–24497 (295 shards). No val/.

Complete corpus

split	shards	range	size
train/	24,498	shard_00000 … shard_24497	~20.5 TB
val/	1,332	shard_00000 … shard_01331	~1.1 TB

The two splits are separated by granule hash (5 %), so no acquisition appears in both. That also means you cannot rebuild val/ from train shards.

⚠️ What is here, and what is not

The upload stopped on 2026-09-14 when the account hit its storage limit. The two repos together hold 10,355 of the 24,498 train shards and none of the 1,332 val shards:

split	full corpus	PACE_v3_1	this repo	on neither
train/	shard_00000–24497	shard_14503–24202	shard_00000–00359, shard_24203–24497	shard_00360–14502 (14,143 shards)
val/	shard_00000–01331	—	—	all 1,332

Every shard in either repo was checked against the local copy before that copy was deleted (sizes match, and a random sample matched byte for byte). The shards on neither repo still exist offline; open a discussion if you need them.

Read this before using the data

• Product version V3_1 has been withdrawn by NASA. OB.DAAC now serves only version 3.2, and V3_1 cannot be downloaded again. Going from V3_1 to V3_2 changes Rrs by a median of 3.3 % per band and 1.03° median SAM, so a model trained here and tested on current PACE files has a hidden train/test radiometry mismatch.
• The corpus has measured problems: the quality score mostly measures missing pixels, turbid water is 1.6 % of tiles, invalid pixels are stored as zero, and l2_flags and Rrs_unc were not kept. All of these are described with numbers on the PACE_v3_1 card.

Format

Each .tar shard holds patches: Rrs as int16 with a scale factor (172 bands), a one-bit per-pixel validity mask, and per-patch metadata (lat/lon, year/day-of-year, solar zenith, flag fractions, per-granule quality terms).

Other datasets from the same project

repository	what it is
TalhaMah56/PACE_v3_1	part 1 of this corpus
TalhaMah56/pace-s2-emit-triplets	PACE × Sentinel-2 × EMIT scenes on a shared grid
TalhaMah56/pace-s2-emit-sr-tiles	super-resolution training tiles cut from those scenes

Attribution

NASA PACE OCI Level-2 Apparent Optical Properties (V3_1), courtesy of the NASA Ocean Biology Distributed Active Archive Center (OB.DAAC). PACE data are NASA public-domain products.