Articles

Loading and Processing GPX 1.1 files using Oracle XMLDB

Note This is an article I wrote some years back which I have ported to my new website. Introduction There are a large number of geospatial data storage, delivery and interchange formats around nowadays. Including (I limit this discussion to vector data formats only): Geography Markup Language (GML) Keyhole Markup Language GPS eXchange Format (GPX)Read More

Using SQL Server XML and Spatial to import VicMap seed/Incremental Update Format (IUF) data (Part 1)

Introduction This article is about importing Victorian Government’s Incremental Update File (IUF) XML data into SQL Server. The IUF XML is used to both make available whole datasets (eg Local Government Areas) or deltas/changes. As will be seen it encodes the geometry objects in its own unique way thus is a good dataset to demonstrateRead More

Migrating Tables with Geometry Columns from Oracle to SQL Server Spatial

A colleague asked me the other day how he could move data from a table in an Oracle database with a geometry column to SQL server. Of course I thought of this as a straight forward data migration exercise using standard database tools, in this case SQL Developer and SQL Server Management Studio (SSMS), whereRead More

STMulti

STMulti — Function that returns @p_geometry as a MULTI* geometry Function Specification Description In situations where a geometry column is constrained to hold only the multi version of a base geometry, storage of a single geometry eg LineString requires that geometry to be wrapped as a multi geometry eg MultiLineString. ALTER TABLE [dbo].[Colony] WITH CHECKRead More

STRound

STRound — Function which rounds the ordinates of the supplied geometry. Function Specification Description The result of many geoprocessing operations in any spatial type can be geometries whose ordinates (X, Y etc) have far more decimal digits of precision than the initial geometry. Additionally, some input GIS formats, such as shapefiles (which has no associatedRead More

STPointToCircularArc

STPointToCircularArc — Return a measured point by snapping provided point to the provided CircularString Function Specification Description This function snaps supplied point to @p_circularString, returning the snapped point. Computes Z and M values if exist on @p_circularString. If input @p_circularString is 2D, length from start of @p_circularString to point is returned in M ordinate ofRead More

STLocateBetweenElevations

STLocateBetweenElevations — Computes and returns elements that intersect the specified Z range. Function Specification Description Is implementation of PostGIS: Processes the supplied (3D, 3DM) (multi)linestring returning the elements that intersect the specified range of elevations inclusively. May return points and/or linestrings in the appropriate geometry type. Where a new xy position is to be computed,Read More