arXiv Machine Learning By Haoan Feng, Xin Xu, Leila De Floriani

ImplicitTerrainV2: Wavelet-Guided Spatially Adaptive Neural Terrain Representation

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ImplicitTerrainV2 introduces a wavelet-guided, spatially adaptive neural representation for digital elevation models (DEMs). It uses a wavelet complexity field to localize high-frequency capacity to complex terrain, adaptive sampling to focus training, and gradient matching to preserve smooth manifold structure. After mixed-precision quantization and entropy coding, the model achieves 1.23 bpp with only a 0.28 dB PSNR loss, outperforming prior work by 5.70 dB while using 3.2× fewer parameters and training in 55 s per tile on a single GPU.

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