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Mastering PostGIS

You're reading from   Mastering PostGIS Modern ways to create, analyze, and implement spatial data

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Product type Paperback
Published in May 2017
Publisher Packt
ISBN-13 9781784391645
Length 328 pages
Edition 1st Edition
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Authors (4):
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Dominik Mikiewicz Dominik Mikiewicz
Author Profile Icon Dominik Mikiewicz
Dominik Mikiewicz
Michal Mackiewicz Michal Mackiewicz
Author Profile Icon Michal Mackiewicz
Michal Mackiewicz
Tomasz Nycz Tomasz Nycz
Author Profile Icon Tomasz Nycz
Tomasz Nycz
George Silva George Silva
Author Profile Icon George Silva
George Silva
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Toc

Table of Contents (10) Chapters Close

Preface 1. Importing Spatial Data FREE CHAPTER 2. Spatial Data Analysis 3. Data Processing - Vector Ops 4. Data Processing - Raster Ops 5. Exporting Spatial Data 6. ETL Using Node.js 7. PostGIS – Creating Simple WebGIS Applications 8. PostGIS Topology 9. pgRouting

Vector to raster conversion

The most common method to change vector geometries to raster is using the ST_AsRaster function. The only drawback is that it needs reference raster geometry.

CREATE TABLE raster_ops.admin_rast AS 
SELECT ST_Union(ST_AsRaster(geometry, rast, '32BF', '1', -9999)) rast
FROM raster_ops.admin, (SELECT rast FROM eudem.clip LIMIT 1) rast;

This function allows you to set values of raster pixels according to attribute value, in our example, the height column.

CREATE TABLE raster_ops.admin_rast AS 
SELECT ST_Union(ST_AsRaster(geometry, rast, '32BF', height, -9999)) rast
FROM raster_ops.admin, (SELECT rast FROM eudem.clip LIMIT 1) rast;
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