#21: Quadkeys Are Tile Addresses
Most people treat quadkeys as optional formatting. They’re actually a…
#20: Tile Pyramids Make Maps Zoomable at Scale
Serving a single high-resolution image to a million users would bankrupt…
#19: Sampling Reads Data. Resampling Changes It.
Resampling a raster “just to align it” with another layer, then…
#18: Bit Depth Controls Precision and File Size
Converting a 16-bit elevation model to 8-bit “for visualization”…
#17: Map Algebra Is Math on Grids, Not Drawing on Maps
Most people think of GIS as drawing and clicking. Raster analysis is…
#16: WKT and WKB Describe Shape, Not Location
People export geometry as WKT, move it to another system, and wonder why…
#15: A Feature Is Not Its Geometry
Most GIS people conflate features, geometry, and records. This confusion…
#14: Bounding Boxes Make GIS Fast, Not Accurate
Most spatial queries are actually two queries running invisibly. Ignore…
#13: Floating Point Math Creates Invisible Spatial Errors
A spatial join that should match 100% of features matches 87%. The…
#12: Topology Is About Relationships, Not Shapes
A map can look perfectly fine and still be topologically broken.…
