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DF4LCZ

This repository hosts the code for the DF4LCZ model which is a sam-empowered data fusion framework for scene-level local climate zone classification. The relevant paper is DF4LCZ: A SAM-Empowered Data Fusion Framework for Scene-Level Local Climate Zone Classification

Usage

Install

• Python 3.8
• Tensorflow 2.11.0
• Keras 2.11.0
• Spektral 1.3.0
• albumentations 1.3.1

Train and test

• Change the current directory to DF4LCZ.
• For the Sentinel-2 stream, run single_fix_augment.py using

python ./single_fix_augment.py --model 'resnet11_3D' --batch_size 64 --initial_lr 0.002 --decay_factor 0.4 --patience 40 --epoch 100

• For the Google Earth stream, run GNN_train.py using

python ./GNN_train.py

• For the DF4LCZ classification,
  • Add the weights file paths derived from the two streams into the fusion.py,
  • and run fusion.py

SAM and Graph construction

• Download the SAM weights file sam_vit_h_4b8939.pth from segment anything and place it in the weights folder of DF4LCZ.
• Obtain the original Google patches from the link in the LCZC-GES2 DATASET section of this README.md and store them in the folder DF4LCZ.
• Change the current directory to DF4LCZ.
• Run ins_gen.py for SAM-based instance extraction (make sure to create an output folder beforehand).
• Execute testmasks.py for graph construction; the generated graphs are provided in the folder gg_nodes_refine.

LCZC-GES2 DATASET

• The LCZC-GES2 dataset comprises 19,088 pairs of image patches. Each pair includes a Google Earth RGB image and a Sentinel-2 multispectral image patch. The data can be found in the folders sen2_img_patches and gg_nodes_refine.(gg_nodes_refine contains all graphes after the graph construction procedure, the original google patches please refer to Google drive files)

• The folder patches_split contains the spliting results from two sampling strategies. The file partition_polygons_1125.npz represents one strategy, named “splitting the polygon pool,” while partition_random.npz represents the other strategy, named “splitting the sample pool.”

Latest Updates

• [2024/05/07]: Uploaded a batch of code, including the implementation of DF4LCZ and several comparative models.
• [2024/10/07]: Uploaded a batch of code, including the implementation of SAM-based instance extraction and graph construction.

Citation

If you use this code in your research, please consider citing the following paper:

@ARTICLE{10556641,
  author={Wu, Qianqian and Ma, Xianping and Sui, Jialu and Pun, Man-On},
  journal={IEEE Transactions on Geoscience and Remote Sensing}, 
  title={DF4LCZ: A SAM-Empowered Data Fusion Framework for Scene-Level Local Climate Zone Classification}, 
  year={2024},
  volume={62},
  number={},
  pages={1-16},
  keywords={Feature extraction;Internet;Earth;Task analysis;Image segmentation;Spatial resolution;Meteorology;Data fusion;local climate zone (LCZ) classification;segment anything model (SAM)},
  doi={10.1109/TGRS.2024.3414143}}

Contact

For any inquiries or further information, please contact me.

Other Works

There are some other works in our group:

SAM-Assisted Remote Sensing Imagery Semantic Segmentation with Object and Boundary Constraints(TGRS under review)Code