Caiyun Tech Team

Dec 30, 2022 · Fundamentals

Understanding Map Projections, Coordinate Systems, and Tile Generation

The article explains why flat maps require projections, compares conformal, equal‑area and equidistant methods, describes the WGS84 datum and the GCJ‑02 “Mars” offset, outlines modern Web Mercator tiling standards, and shows how Python libraries like mercantile, pygrib, xarray, GDAL and rasterio can be used to read gridded data and produce map tiles.