Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Using machine learning to generate an open-access cropland map from satellite images time series in the Indian Himalayan region
 
research article

Using machine learning to generate an open-access cropland map from satellite images time series in the Indian Himalayan region

Li, Danya
•
Gajardo, Joaquin
•
Volpi, Michele  
Show more
October 18, 2023
Remote Sensing Applications-Society And Environment

Crop maps are crucial for agricultural monitoring and food management and can additionally support domain-specific applications, such as setting cold supply chain infrastructure in developing countries. Machine learning (ML) models, combined with freely-available satellite imagery, can be used to produce cost-effective and high spatial-resolution crop maps. However, accessing ground truth data for supervised learning is especially challenging in developing countries due to factors such as smallholding and fragmented geography, which often results in a lack of crop type maps or even reliable cropland maps. Our area of interest for this study lies in Himachal Pradesh, India, where we aim at producing an open-access binary cropland map at 10-m resolution for the Kullu, Shimla, and Mandi districts. To this end, we developed an ML pipeline that relies on Sen-tinel-2 satellite images time series. We investigated two pixel-based supervised classifiers, sup-port vector machines (SVM) and random forest (RF), which are used to classify per-pixel time series for binary cropland mapping. The ground truth data used for training, validation and testing was manually annotated from a combination of field survey reference points and visual interpretation of very high resolution (VHR) imagery. We trained and validated the models via spatial cross-validation to account for local spatial autocorrelation and improve the generalization capability of the model. We tested the model on hold out test sets of each district, achieving an aver-age accuracy for the RF (our best model) of 87%. We noticed NIR band at the early and late stage of the apple harvest season (main crop in the region) to be of critical importance for the model. Finally, we used this model to generate a cropland map for three districts of Himachal Pradesh, spanning 14,600 km2, which improves the resolution and quality of existing public maps, and made the code open-source.

  • Details
  • Metrics
Type
research article
DOI
10.1016/j.rsase.2023.101057
Web of Science ID

WOS:001102917600001

Author(s)
Li, Danya
Gajardo, Joaquin
Volpi, Michele  
Defraeye, Thijs
Date Issued

2023-10-18

Publisher

Elsevier

Published in
Remote Sensing Applications-Society And Environment
Volume

32

Article Number

101057

Subjects

Life Sciences & Biomedicine

•

Technology

•

Cropland Mapping

•

Smallholders

•

Remote Sensing

•

High-Altitude Region

•

Random Forest

•

Feature Engineering

•

Google Earth Engine

•

Sentinel-2

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SDSC  
FunderGrant Number

Rockefeller Foundation

Mastercard Center for Inclusive Growth

Available on Infoscience
February 19, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/204220
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés