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11 guides on Joins.
What is an Ontology? Definition, Parts, Spatial Ontologies
An ontology is a formal model of the things in a domain and how they relate. Its parts, how it differs from a taxonomy or knowledge graph, and what makes one spatial.
What is H3? Uber’s Hexagonal Spatial Index
H3 is Uber's open-source hexagonal grid for indexing locations on Earth. How the H3 index works, its 16 resolutions, H3 vs S2 and geohash, and H3 in SQL.
What is Geospatial Data? Types, Formats, Examples
Geospatial data describes things tied to a place on Earth. The two main types, vector and raster, plus formats, sources, and examples.
What is Geospatial Analysis? Methods and Examples
Geospatial analysis, or spatial analysis, examines where things are and how location shapes patterns. Methods, examples, GIS vs spatial analysis, and SQL.
What is a Building Footprint? Data, Sources, Uses
A building footprint is the outline a building occupies on the ground. What footprint data contains, the major open datasets, and how to use them at scale.
What is Probable Maximum Loss (PML)? EP Curves, AAL
Probable maximum loss (PML) is the largest loss an insurer expects from one property or a portfolio at a chosen probability. How PML, EP curves, and AAL fit.
What is POI Data? Points of Interest Data, Sources
POI data lists the places people go: shops, restaurants, hospitals, schools, and landmarks. What a record contains, where it comes from, and how to use it.
What Is a Spatial Join? Predicates, Types, and SQL
A spatial join matches rows from two tables by where their geometries sit. How spatial joins work, the predicates and join types, and how to write one in SQL.
Raster vs. Vector Data: Differences, Formats, and Uses
Raster data is a grid of pixels. Vector data is points, lines, and polygons. How the two GIS data models differ, their formats, and how to combine them.
What is Parcel Data? Parcel Numbers, Boundaries, Sources
Parcel data records every piece of land: its boundary, parcel number, owner, land use, and assessed value. Where it comes from and how to use it.
Data Center Site Selection: Criteria, Data Layers, Process
Data center site selection is the process of finding land where a facility of 50 to 1,000 megawatts can be powered, connected, cooled, permitted, and kept out of harm’s way. It screens candidate parcels against grid capacity, fiber routes, water availability, natural hazards, zoning, and latency to users, then ranks the survivors on cost and […]
