topology

From CAD to GIS. Convert polylines to polygons

When I convert CAD data into GIS format the first thing I do is a topological check. It is important because in this way I can identify the open polylines that I will certainly generate

vector topology tools each gisadvice

Online from

28 November 2020

Reading time

1 minute

Fix invalid geometries

Learn how to fix geometry with Self-intersection errors in PostGIS using functions like ST_MakeValid, ST_IsValid, and more. A practical guide to ensuring correct topologies in your GIS data.

geometry topology geodatabase gis editing

Online from

13 June 2020

Reading time

3 minutes

Remove duplicates from a vector

How to eliminate duplicates in a linear vector using SQL and the Topology Checker plugin in QGIS. A practical case with OSM and PostGIS hydrographic data.

sql vector osm topology gis

Online from

12 December 2017

Reading time

1 minute

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