SuperComputer/mars_hirise_dtm_processed-d737fb4b0c75695d

Mars HiRISE DTM — LitData Streaming Dataset

Pre-processed Mars HiRISE orthoimage + DTM patches in LitData optimized streaming format.

Quick Start

from litdata import StreamingDataset

# Stream directly from HuggingFace — no full download needed
train_ds = StreamingDataset(input_dir="hf://datasets/SuperComputer/mars_hirise_dtm_processed-d737fb4b0c75695d/train")
val_ds   = StreamingDataset(input_dir="hf://datasets/SuperComputer/mars_hirise_dtm_processed-d737fb4b0c75695d/val")
test_ds  = StreamingDataset(input_dir="hf://datasets/SuperComputer/mars_hirise_dtm_processed-d737fb4b0c75695d/test")

sample = train_ds[0]

# Core Tensors
print(sample["image"].shape)        # (3, H, W) float16
print(sample["dtm"].shape)          # (3, H, W) float16
print(sample["confidence"].shape)   # (1, H, W) float16

# Physical / Lighting Parameters
print(sample["sun_vector"].shape)   # (3,)      float32
print(sample["intensity"])          # float32
print(sample["ambient"])            # float32

# Original / Unnormalized Data
print(sample["original_image"].shape) # (C, H, W) float16
print(sample["original_dtm"].shape)   # (1, H, W) float16
print(sample["trend_params"].shape)   # (3,)      float16

# Normalization / Processing Metadata
print(sample["residual_scale"])     # float32
print(sample["raw_residual_p98"])   # float32
print(sample["key"])                # str (e.g., "left_red")

Fields

During extraction, model inputs are quantized to float16 to optimize streaming bandwidth. Physical lighting parameters remain float32.

Key	Dtype	Shape	Description
image	float16	(3, H, W)	Normalized HiRISE orthoimage [-1, 1]
dtm	float16	(3, H, W)	Normalized DTM elevation
confidence	float16	(1, H, W)	Binary valid data mask (eroded/cleaned)
sun_vector	float32	(3,)	Estimated sun direction (OLS, unit-normalized)
intensity	float32	scalar	Estimated sun intensity
ambient	float32	scalar	Estimated ambient light
original_image	float16	(C, H, W)	Unnormalized resized orthoimage
original_dtm	float16	(1, H, W)	Unnormalized resized DTM elevation
trend_params	float16	(3,)	LSQR detrend parameters for the DTM plane
residual_scale	float32	scalar	Normalization scale applied to the DTM residual
raw_residual_p98	float32	scalar	98th percentile of the raw topographic residual
key	string	scalar	Orthoimage source used (e.g., left_red)

Preprocessing Configuration

Config Hash: d737fb4b0c75695d

This dataset was generated with the following pipeline parameters:

hirise:
  root: /scratch/mars_hirise_dtm
  include_ortho: true
  ortho_type: RED
  ortho_scale: null
  download: false
  reuse_cache: true
  target: null
  bbox:
  - 60
  - 0
  - 90
  - 30
sampler:
  size: 0.018
  length: null
resolution: 512
dtm_normalization: relative