Datasetpublic

aliasfox/srtm30m-ozt2-v2

SRTM 30m OZT2 Elevation Tiles This dataset contains SRTM 30-meter resolution elevation data encoded in the OZT2 tile format. Format OZT2 is a high-performance elevation tile format: Compression: ~93% smaller than Terrarium PNG Prediction: Gradient-based prediction (left neighbor + vertical gradient) Quantization: Adaptive bit-depth (8/10/12/16-bit per channel) Codec: Zstd q3 (30× faster encode than Brotli, same decode speed) Each tile is 256×256 pixels in Web… See the full description on the dataset page: https://huggingface.co/datasets/aliasfox/srtm30m-ozt2-v2.

sourceHugging Faceupdated 9m agoView on Hugging Face

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Dataset Card

SRTM 30m OZT2 Elevation Tiles

This dataset contains SRTM 30-meter resolution elevation data encoded in the OZT2 tile format.

Format

OZT2 is a high-performance elevation tile format:

—Compression: ~93% smaller than Terrarium PNG
—Prediction: Gradient-based prediction (left neighbor + vertical gradient)
—Quantization: Adaptive bit-depth (8/10/12/16-bit per channel)
—Codec: Zstd q3 (30× faster encode than Brotli, same decode speed)

Each tile is 256×256 pixels in Web Mercator projection (EPSG:3857).

Usage

python

from huggingface_hub import HfFileSystem
from openzenith import decode_v2

fs = HfFileSystem(repo_id="aliasfox/srtm30m-ozt2-v2")
with fs.open("tiles/z10/163/395.ozt2", "rb") as f:
    data = f.read()
elevation, meta = decode_v2(data)

Source

Source: SRTM 30m via aliasfox/srtm30m-merged