The modern trend towards widespread use of software and tools for processing geospatial (including geophysical) data for a wide range of consumers contributes to the development of web-oriented solutions to the associated problems. A special complexity in the context of program implementation as well as the client computing capabilities is the visualization of geospatial information, which in the web environment is associated with the need to ensure acceptable rendering reactivity, on the one hand, and spatial image quality, on the other. Two main problems can be highlighted here: spatial image artifacts that appear as breaks in level lines, and the impossibility of technically combining heterogeneous spatial primitives into a single layer for retrospective dynamic visualization. The paper is concerned with the solutions to eliminate the above problems using geostatistical models and methods, as well as web design algorithms, patterns, and technologies. Using a web GIS for visualizing geophysical parameters as an example, the operability and effectiveness of the proposed software and algorithmic solutions are confirmed.