WKT Raster

Welcome to the WKT Raster project home page!

WKT Raster is an ongoing project aiming at developing raster support in PostGIS. It is a new project very different from the previous PGRaster project and also very different from ​Oracle Spatial GeoRaster.

The goal of WKT Raster is to implement the RASTER type as much as possible like the GEOMETRY type is implemented in PostGIS and to offer a single set of overlay SQL functions (like ST_Intersects) operating seamlessly on vector and raster coverages.

Specification

• ​Working Specification
• ​Working Documentation (very preliminary)
• Original Project Presentation - rationale, examples and preliminary specifications: ​PPT, ​PDF (v1.0)

For more details and examples of application:

• Search for "WKT Raster" in the ​PostGIS mailing list archive or in ​Nabble
• Write to ​Pierre Racine

Overview

• is as simple as PostGIS…
  • one table = one raster coverage (like a vector coverage)
  • one row = one tile or one raster object (like a vector coverage where one row = one geometry)
  • only one new type: RASTER (like the PostGIS GEOMETRY type)
  • each raster tile has a pixel size, a width and a height, a variable number of band, a pixel type per band and a nodata value per band. Everything essential to do base raster GIS operations.