1. Various SQL constructs including ANTI join, LEFT, RIGHT, EXISTS, LATERAL, CASE clauses, aggregates
2. What common table expressions (CTEs) are and when to and when not to use them
3. We'll demonstrate these concepts in use in a couple of common spatial query problems - e.g. proximity analysis (both geometry and geography), raster analysis and generation, aggregation of data based on various attributes, other correlation queries.

Slides HTML: https://postgis.us/presentations/PostGISDay2021_PostGISExtensions.html

Slides PDF: https://postgis.us/presentations/PostGISDay2021_PostGISExtensions.pdf

Code: https://postgis.us/presentations/postgis_day_2021.sql
Screen reader support enabled.

This talk will showcase spatial feats you can do with PostGIS
Special focus will be given to features new in PostGIS 2.2 and upcoming PostGIS 2.3.

What we will cover:

Geometry -

• Proximity analysis with improved KNN functionality introduced in PostGIS 2.2
• Geometry dicing for speedier performance in data grouping and proximity analysis,
• Geometry clustering

Geography - Proximity analysis using KNN (new in PostGIS 2.2)
Raster - in-database raster coverage making
Topology - geometry simplification that maintains connectedness of adjoining geometries
Geocoding and Address Standardization - Basic examples using PostGIS Tiger Geocoder, and address standardizer (new in PostGIS 2.2.)

Brief coverage of what's coming in PostGIS 2.3
Discussion of speed improvements, generating random points