This article shows how to use GeoRaptor’s Jump to Geometry functionality to conduct “one off” mapping of SDO_GEOMETRY and EWKT/WKT text objects. PostGIS is shown as a source for EWKT showing how to integrate development across multiple databases.
Introduction The ordinates stored in an geometry objects, across all spatial data types do not have any rounding applied to their values. This is one aspect of data management that is seldom considered by most practitioners. Other articles in this website deal with how to round their values. This article is about a related topic”Read More
This article demonstrates how an invalid polygon (and linestring) are handled by the different database spatial APIs with correction in TSQL.
This article shows how to use PostgreSQL’s XMLTABLE XML operator to process GML data and create PostGIS geometries.
I love working with the PostGIS API. It is a deep and wide river to swim in. But sometime having read, researched, experimented, and not found the right solution one can be forced to roll one’s own so to speak to get the job done. For the problem below, if someone can point out aRead More
This article describes the elements of a telecommunications pit and shows how they can be spatially represented. In particular the concept of a butterfly as a method for displaying the walls of a pit is introduced.
A great day has arrived for PostgreSQL developers (not just Spatial geeks) in that finally an integrated spatial viewer has been added to PgAdmin 4.3 as announced by Regina Obe You can see the announcement and some examples here
I wrote an article on Gridding a PostGIS Geometry object a while back. I had cause, recently, to use a variation on this for the generation of an array of point objects for a geometry polygon, so I wrote a version that also allows for the generation of a grid of polygons or points dependingRead More
This article shows how to create and use an r-based Delaunay triangulation function for postgis using a XYZ supporting version of the deldir package.
It is useful to have functions for converting from individual degrees, minutes and seconds to a single decimal degree value and back again. Here are some useful plPgSql functions. DMS2DD Firstly, a function to convert individual degrees, minutes and seconds values to a single decimal degree value. Now for some examples…. Result: dms2dd -44.1805555555556 Result:Read More