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https://www.ibge.gov.br/en/geosciences/digital-surface-models/digital-surface-models?lang=en-GB Digital surface models | IBGE digital surface models ibge https://ui.adsabs.harvard.edu/abs/2018arXiv180707996B/abstract Variance propagation for density surface models - ADS Spatially-explicit estimates of population density, together with appropriate estimates of uncertainty, are required in many management contexts. Density... surface models variance propagation density ads https://arxiv.org/abs/1807.07996 [1807.07996] Variance propagation for density surface models Abstract page for arXiv paper 1807.07996: Variance propagation for density surface models surface models 1807 variance propagation density https://kottke.org/25/09/incredibly-realistic-3d-models-of-the-moons-surface-from-1874 Incredibly Realistic 3D Models of the Moon’s Surface (From 1874!) Sep 16, 2025 - A gem of a find by The Public Domain Review of a collection from the Rijksmuseum: photographs of plaster models of the Moon’s surface that were made from incredibly realistic 3d models surface 1874