🌲 AGBD: A Global-scale Biomass Dataset 🌳

Authors: Ghjulia Sialelli ([email protected]), Torben Peters, Jan Wegner, Konrad Schindler

🆕 Updates

• The dataset was last modified on Dec. 4th, 2024
• See the changelog for more information about what was updated!

🚀 Quickstart

To get started quickly with this dataset, use the following code snippet:

# Install the datasets library if you haven't already
!pip install datasets

# Import necessary modules
from datasets import load_dataset

# Load the dataset
dataset = load_dataset('prs-eth/AGBD', trust_remote_code=True, streaming=True)["train"]  # Options: "train", "val", "test"

# Iterate over the dataset
for sample in dataset:
  features, label = sample['input'], sample['label']

This code will load the dataset as an IterableDataset. You can find more information on how to work with IterableDataset objects in the Hugging Face documentation.

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📊 Dataset Overview

Each sample in the dataset contains a pair of pre-cropped images along with their corresponding biomass labels. For additional resources, including links to the preprocessed uncropped data, please visit the project page on GitHub.

⚙️ Load Dataset Options

The load_dataset() function provides the following configuration options:

• norm_strat (str) : {'pct', 'mean_std', 'none'} (default = 'pct')
  The strategy to apply to process the input features. Valid options are: 'pct', which applies min-max scaling with the 1st and 99th percentiles of the data; 'mean_std' which applies Z-score normalization; and 'none', which returns the un-processed data.

• encode_strat (str) : {'sin_cos', 'onehot', 'cat2vec', 'none'} (default = 'sin_cos') The encoding strategy to apply to the land classification (LC) data. Valid options are: 'onehot', one-hot encoding; 'sin_cos', sine-cosine encoding; 'cat2vec', cat2vec transformation based on embeddings pre-computed on the train set.

• input_features (dict) The features to be included in the data, the default values being:

  {'S2_bands': ['B01', 'B02', 'B03', 'B04', 'B05', 'B06', 'B07', 'B08', 'B8A', 'B09','B11', 'B12'], 
   'S2_dates' : False, 'lat_lon': True, 'GEDI_dates': False, 'ALOS': True, 'CH': True, 'LC': True, 
   'DEM': True, 'topo': False}
  

• additional_features (list) (default = [])
  A list of additional features the dataset should include. Refer to the documentation below for more details. Possible values are:

  ['s2_num_days', 'gedi_num_days', 'lat', 'lon', 'agbd_se', 'elev_lowes', 'leaf_off_f', 'pft_class', 'region_cla', 'rh98', 'sensitivity', 'solar_elev', 'urban_prop']
  

  This metadata can later be accessed as such:

  from datasets import load_dataset
  
  dataset = load_dataset('AGBD.py',trust_remote_code=True,streaming=True)
  for sample in dataset['train']:
    lat = sample['lat']
    break
  

• patch_size (int) (default =15)
  The size of the returned patch (in pixels). The maximum value is 25 pixels, which corresponds to 250 meters.

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🖼️ Features Details

Each sample consists of a varying number of channels, based on the input_features and encode_strat options passed to the load_dataset() function. The channels are organized as follows:

Feature	Channels	Included by default?	Description
Sentinel-2 bands	B01, B02, B03, B04, B05, B06, B07, B08, B8A, B09, B11, B12	Y	Sentinel-2 bands, in Surface Reflectance values
Sentinel-2 dates	s2_num_days, s2_doy_cos, s2_doy_sin	N	Date of acquisition of the S2 image (in number of days wrt the beginning of the GEDI mission); sine-cosine encoding of the day of year (DOY).
Geographical coordinates	lat_cos, lat_sin, lon_cos, lon_sin	Y	Sine-cosine encoding of the latitude and longitude.
GEDI dates	gedi_num_days, gedi_doy_cos, gedi_doy_sin	N	Date of acquisition of the GEDI footprint (in number of days wrt the beginning of the GEDI mission); sine-cosine encoding of the day of year (DOY).
ALOS PALSAR-2 bands	HH,HV	Y	ALOS PALSAR-2 bands, gamma-naught values in dB.
Canopy Height	ch, ch_std	Y	Canopy height from Lang et al. and associated standard deviation.
Land Cover Information	lc_encoding*, lc_prob	Y	Encoding of the land class, and classification probability (as a percentage between 0 and 1).
Topography	slope, aspect_cos, aspect_sin	N	Slope (percentage between 0 and 1); sine-cosine encoded aspect of the slope.
Digital Elevation Model (DEM)	dem	Y	Elevation (in meters).

This corresponds to the following value for input_features : {'S2_bands': ['B01', 'B02', 'B03', 'B04', 'B05', 'B06', 'B07', 'B08', 'B8A', 'B09','B11', 'B12'], 'S2_dates' : False, 'lat_lon': True, 'GEDI_dates': False, 'ALOS': True, 'CH': True, 'LC': True, 'DEM': True, 'topo': False}

Regarding lc_encoding*, the number of channels follows this convention:

• sin_cos (default) : 2 channels
• cat2vec : 5 channels
• onehot : 14 channels
• none : 1 channel

Should you get stuck, you can debug the number of channels using the compute_num_features() function in AGBD.py.

In summary, the channels are structured as follows:

(Sentinel-2 bands) | (Sentinel-2 dates) | (Geographical coordinates) | (GEDI dates) | (ALOS PALSAR-2 bands) | (Canopy Height) | (Land Cover Information) | (Topography) | DEM

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➕ Additional Features

You can include a list of additional features from the options below in your dataset configuration:

• "agbd_se" - AGBD Standard Error: The uncertainty estimate associated with the aboveground biomass density prediction for each GEDI footprint.
• "elev_lowes" - Elevation: The height above sea level at the location of the GEDI footprint.
• "leaf_off_f" - Leaf-Off Flag: Indicates whether the measurement was taken during the leaf-off season, which can impact canopy structure data.
• "pft_class" - Plant Functional Type (PFT) Class: Categorization of the vegetation type (e.g., deciduous broadleaf, evergreen needleleaf).
• "region_cla" - Region Class: The geographical area where the footprint is located (e.g., North America, South Asia).
• "rh98" - RH98 (Relative Height at 98%): The height at which 98% of the returned laser energy is reflected, a key measure of canopy height.
• "sensitivity" - Sensitivity: The proportion of laser pulse energy reflected back to the sensor, providing insight into vegetation density and structure.
• "solar_elev" - Solar Elevation: The angle of the sun above the horizon at the time of measurement, which can affect data quality.
• "urban_prop" - Urban Proportion: The percentage of the footprint area that is urbanized, helping to filter or adjust biomass estimates in mixed landscapes.
• "gedi_num_days" - Date of GEDI Footprints: The specific date on which each GEDI footprint was captured, adding temporal context to the measurements.
• "s2_num_days" - Date of Sentinel-2 Image: The specific date on which each Sentinel-2 image was captured, ensuring temporal alignment with GEDI data.
• "lat" - Latitude: Latitude of the central pixel.
• "lon" - Longitude: Longitude of the central pixel.