Spatial-analyst.net es un sitio web muy interesante y recomendable, repleto de mapas globales sobre cualquier asunto.
spatial-analyst.net is a non-commercial website intended for users interested in advanced use of geocomputational tools. The topics discussed generally belong to spatio-temporal data analysis sciences, digital cartography, geomorphometry, geostatistics, geovisualization, GPS tracking and navigation, raster-based GIS modelling and similar. Most of the articles presented are only supplementary materials to various research publications. Visitors of the website are kindly asked to refer to the peer-reviewed publications, when citing some of the materials, instead of referring to the URL of an article. All materials are prepared on an informative basis only. This is a wiki project, which obviously means that you can edit, extend and modify much of its content. Please also read the disclaimer before using some of the materials. and NO! This site has not much to do with the ESRI’s spatial analyst extension.
P.s lo he encontrado con la búsqueda de la palabra shipping density en el marco de la reciente entrada sobre la historia del concepto de Ruta Marítima Central.