database

Calculating Slope on a Tiled Dataset, Part 1

Today we'll examine the implications of calculating slope on a tiled DEM.

Passing Arguments to Map Algebra Callbacks

The docs say that we can pass additional arguments to ST_MapAlgebra callbacks, but how do we actually do that?

Creating Rasters from Scratch in PostGIS, Part 3

In this post, we'll learn how to create a multi-band raster from another raster using PostGIS.

A Totally Random Map Algebra Callback in PostGIS, Part 2

In this post we'll learn how to write multi-band callback functions for ST_MapAlgebra.

A Totally Random Map Algebra Callback in PostGIS

In this post we'll try to get a better understanding of the structure of ST_MapAlgebra callback functions.

Creating Rasters from Scratch in PostGIS, Part 2

In this post, we'll learn how to create a multi-band raster from scratch using PostGIS.

Creating Rasters from Scratch in PostGIS, Part 1

In this post, we'll learn how to create a single-band raster from scratch using PostGIS.

Installing PL/V8 in PostgreSQL 9.5

Our only goal in this post is to make sure we have installed PostgreSQL's PL/V8.