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