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“What is a port?” · “Why is my code erroring?”
Ask me anything about your lessons or your code.
“What is a port?” · “Why is my code erroring?”
Three vector formats dominate real GIS work, and picking wrong costs an analyst broken field names, silent data loss, or a folder of five files where one should do.
Vector Formats: Shapefile, GeoJSON, and GeoPackage
Three vector formats dominate real GIS work, and picking wrong costs an analyst broken field names, silent data loss, or a folder of five files where one should do.
Raster Formats: GeoTIFF, COGs, and Tiles
A satellite image is a grid of numbers, and GeoTIFF is the file that ties that grid to real ground coordinates so software knows where every pixel sits.
GeoJSON: The Web-Native Spatial Format
A GeoJSON file is a FeatureCollection of Features, and the one fact that trips up nearly everyone is that its coordinates run longitude first, then latitude.
Where to Get Real Geospatial Data
A short list of open sources covers most real GIS work, and the two habits that keep any of them from wasting a day are checking the license and checking the CRS before the first join.
Metadata: Knowing What You Actually Have
A shapefile with no metadata is a shape with no story, and an analyst who trusts it without checking is one CRS mismatch away from a map that is wrong in a way nobody notices.