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Mastering PostGIS

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

Product type Paperback

Published in May 2017

Publisher Packt

ISBN-13 9781784391645

Length 328 pages

Edition 1st Edition

Languages

SQL

Tools

PostGIS

Concepts

Geospatial Analysis

Authors (4):

George Silva

Mikiewicz

Michal Mackiewicz

Nycz

View More author details

Table of Contents (9) Chapters

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

Chapter 4. Data Processing - Raster Ops

PostGIS raster's goal 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 (such as ST_Intersects) operating seamlessly on vector and raster coverages.

Each raster or raster tile is stored as a row of data in a PostgreSQL database table. It is a complex type, embedding information about the raster itself (width, height, number of bands, pixel type for each band, and no data value for each band) along with its geolocalization (pixel size, upper left pixel center, rotation, and SRID). These metadata are accessible by raster_columns view.

Something that shows flexibility of PostGIS raster support is in-db / out-db raster tile storage. Operations on these are identical, no matter if the raster is stored internally in PostgreSQL or file in filesystem. The only drawback is query processing time for out-db raster coverages.

PostGIS Raster is expressed in different...

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Authors (4)

George Silva

George Silva

See other products by George Silva

Mikiewicz

Mikiewicz

Dominik Mikiewicz is a senior GIS consultant and the owner of one-person software shop Cartomatic. When not coding, he spends time with wife and kids, trying to make the little ones enjoy mountain trekking. He is also a long-distance cycling and running enthusiast.

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Michal Mackiewicz

Michal Mackiewicz

Michal Mackiewicz has been working as a software engineer at GIS Support for five years. His main job is to orchestrate various open source geospatial components and creating application-specific GIS systems. PostgreSQL and PostGIS are among his favorite tools, and are used in almost every project. Apart from developing, he also runs PostGIS training courses. When not at work, he volunteers for OpenStreetMap and a local railway preservation society.

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Nycz

Nycz

Tomasz Nycz is a geographer and cartographer. He initiated the implementation of GIS in the State Fire Service units in Poland. He works with recognized GIS companies in the emergency management industry. In practice, he uses QGIS and PostGIS. He has been an OpenStreetMap contributor for years. He also develops his scientific interests in the use of new technologies in geomorphology and remote sensing. He is also an avid drone pilot and mountain explorer.

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