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Scale-MAE: A Scale-Aware Masked Autoencoder for Multiscale Geospatial Representation Learning

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arxiv 2212.14532 v4 pith:MZXTSK7P submitted 2022-12-30 cs.CV

Scale-MAE: A Scale-Aware Masked Autoencoder for Multiscale Geospatial Representation Learning

classification cs.CV
keywords imagescale-maescalesimagerymaskedmodelsremotesensing
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

Large, pretrained models are commonly finetuned with imagery that is heavily augmented to mimic different conditions and scales, with the resulting models used for various tasks with imagery from a range of spatial scales. Such models overlook scale-specific information in the data for scale-dependent domains, such as remote sensing. In this paper, we present Scale-MAE, a pretraining method that explicitly learns relationships between data at different, known scales throughout the pretraining process. Scale-MAE pretrains a network by masking an input image at a known input scale, where the area of the Earth covered by the image determines the scale of the ViT positional encoding, not the image resolution. Scale-MAE encodes the masked image with a standard ViT backbone, and then decodes the masked image through a bandpass filter to reconstruct low/high frequency images at lower/higher scales. We find that tasking the network with reconstructing both low/high frequency images leads to robust multiscale representations for remote sensing imagery. Scale-MAE achieves an average of a $2.4 - 5.6\%$ non-parametric kNN classification improvement across eight remote sensing datasets compared to current state-of-the-art and obtains a $0.9$ mIoU to $1.7$ mIoU improvement on the SpaceNet building segmentation transfer task for a range of evaluation scales.

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Forward citations

Cited by 8 Pith papers

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