Overview of the pretraining and deployment pipeline for SatCLIP.

SatCLIP trains location and image encoders via contrastive learning, by matching images to their corresponding locations. This is analogous to the CLIP approach, which matches images to their corresponding text. Through this process, the location encoder learns characteristics of a location, as represented by satellite imagery. For more details, check out our paper.

Usage of SatCLIP is simple:

from model import *
from location_encoder import *

model = SatCLIP(
    embed_dim=512,
    image_resolution=224, in_channels=13, vision_layers=4, vision_width=768, vision_patch_size=32, # Image encoder
    le_type='sphericalharmonics', pe_type='siren', legendre_polys=10, frequency_num=16, max_radius=360, min_radius=1, harmonics_calculation='analytic'  # Location encoder
)

img_batch = torch.randn(32, 13, 224, 224) # Represents a batch of 32 images
loc_batch = torch.randn(32, 2) # Represents the corresponding 32 locations (lon/lat)

with torch.no_grad():
    logits_per_image, logits_per_coord = model(img_batch, loc_batch)
    probs = logits_per_image.softmax(dim=-1).detach().cpu().numpy()

You first need to download the S2-100k dataset in /data/s2. First, download the index file:

cd data/s2
wget https://satclip.z13.web.core.windows.net/satclip/index.csv

Within /data/s2, navigate to /images, download all images and unpack them:

cd images
wget https://satclip.z13.web.core.windows.net/satclip/satclip.tar
tar -xf satclip.tar

Now, to train SatCLIP models, set the paths correctly, adapt training configs in clip/configs/default.yaml and train SatCLIP by running:

python clip/main.py

The S2-100K dataset is a dataset of 100,000 multi-spectral satellite images sampled from Sentinel-2 via the Microsoft Planetary Computer. Copernicus Sentinel data is captured between Jan 1, 2021 and May 17, 2023. The dataset is sampled approximately uniformly over landmass and only includes images without cloud coverage. The dataset is available for research purposes only. If you use the dataset, please cite our paper. More information on the dataset can be found in our paper.

Visualization of embeddings obtained by different location encoders for locations around the globe.

We provide six pretrained SatCLIP models, trained with different vision encoders and spatial resolution hyperparameters $L$ (these indicate the number of Legendre polynomials used for spherical harmonics location encoding. Please refer to our paper for more details). The pretrained models can be downloaded as follows:

• SatCLIP-ResNet18-L10: wget https://satclip.z13.web.core.windows.net/satclip/satclip-resnet18-l10.ckpt
• SatCLIP-ResNet18-L40: wget https://satclip.z13.web.core.windows.net/satclip/satclip-resnet18-l40.ckpt
• SatCLIP-ResNet50-L10: wget https://satclip.z13.web.core.windows.net/satclip/satclip-resnet50-l10.ckpt
• SatCLIP-ResNet50-L40: wget https://satclip.z13.web.core.windows.net/satclip/satclip-resnet50-l40.ckpt
• SatCLIP-ViT16-L10: wget https://satclip.z13.web.core.windows.net/satclip/satclip-vit16-l10.ckpt
• SatCLIP-ViT16-L40: wget https://satclip.z13.web.core.windows.net/satclip/satclip-vit16-l40.ckpt

Usage of pretrained models is simple:

from load import get_satclip

device = 'cuda'

c = torch.randn(32, 2) # Represents a batch of 32 locations (lon/lat)

model = get_satclip('path_to_satclip', device=device) #Only loads location encoder by default
model.eval()
with torch.no_grad():
  emb  = model(c.double().to(device)).detach().cpu()

Examples on how to obtain and use pretrained SatCLIP embeddings can be found in the notebooks folder. We provide notebooks (optimized for use with Google Colab)for the following experiments:

• 00 - Simple usage example
• 01 - Air temperature prediction with SatCLIP

@article{klemmer2023satclip,
  title={SatCLIP: Global, General-Purpose Location Embeddings with Satellite Imagery},
  author={Klemmer, Konstantin and Rolf, Esther and Robinson, Caleb and Mackey, Lester and Ru{\ss}wurm, Marc},
  journal={arXiv preprint arXiv:2311.17179},
  year={2023}
}

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