By Paolo Corti, Stephen Vincent Mather, Thomas J. Kraft, Bborie Park

http://www.packtpub.com/postgis-to-store-organize-manipulate-analyze-spatial-data-cookbook/book

Integrate PostGIS with internet frameworks and enforce OGC criteria resembling WMS and WFS utilizing MapServer and GeoServer
Convert 2nd and 3D vector information, raster info, and routing facts into usable forms
Visualize info from the PostGIS database utilizing a computer GIS application akin to QGIS and OpenJUMP
Easy-to-use recipes with complex analyses of spatial facts and functional applications

What you are going to examine from this book

Import and export geographic information from the PostGIS database utilizing the on hand tools
Structure spatial information utilizing the performance supplied by means of the combo of PostgreSQL and PostGIS
Work with a suite of PostGIS features to accomplish uncomplicated and complex vector analyses
Connect PostGIS with Python
Learn to take advantage of programming frameworks round PostGIS
Maintain, optimize, and fine-tune spatial info for long term viability
Explore the 3D functions of PostGIS, together with LiDAR aspect clouds and element clouds derived from constitution from movement (SfM) techniques
Distribute 3D versions in the course of the net utilizing the X3D standard
Use PostGIS to strengthen strong GIS net functions utilizing Open Geospatial Consortium net standards
Master PostGIS Raster

In Detail

PostGIS is a spatial database that integrates complicated garage and research of vector and raster facts, and is remarkably versatile and strong. PostGIS presents help for geographic items to the PostgreSQL object-relational database and is at present the preferred open resource spatial databases. that will discover the whole diversity of PostGIS options and disclose the similar extensions, this ebook is a must-have.

This ebook is a deep-dive into the total diversity of PostGIS subject matters, with useful functions of the suggestions and code. it's a accomplished advisor on PostGIS instruments and ideas that are required to regulate, control, and examine spatial information in PostGIS. This ebook is choked with systematic directions of hands-on examples and in-depth reasons. Even for skilled clients, this publication will function a good resource of reference through delivering new methods of operating with PostGIS throughout the book's easy-to-follow approach.

This hands-on advisor appears at key spatial facts manipulation projects, explaining not just how each one job is played, but additionally why. It presents sensible information permitting you to securely benefit from the complicated know-how in PostGIS on the way to simplify your spatial database management tasks.

This useful ebook can assist you're taking benefit of easy and complex vector, raster, and routing methods. you'll learn how to use the techniques of information upkeep, optimization, and function, with a view to assist you to combine those right into a huge environment of laptop and internet tools.

With this entire advisor, you'll be armed with the entire instruments and directions you want to either deal with the spatial database procedure and make larger judgements as your project's necessities evolve.

Approach

An easy-to-use advisor, filled with hands-on recipes for manipulating spatial facts in a PostGIS database. every one subject is defined and put in context, and for the extra inquisitive, there are extra info of the recommendations used.
Who this booklet is for

If you're a net developer or a software program architect, specially in location-based businesses, and wish to extend the variety of concepts you're utilizing with PostGIS, then this e-book is for you. you'll have a few previous adventure with PostgreSQL database and spatial options.

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The next are the main points of those bands: decide on 1 AS bandnum, (ST_BandMetadata(rast, 1)). * FROM prism the place rid = 550 UNION ALL choose 2 AS bandnum, (ST_BandMetadata(rast, 2)). * FROM prism the place rid = 550 ORDER by way of bandnum; The output seems as follows: bandnum | pixeltype | nodatavalue | isoutdb | direction ---------+-----------+-------------+---------+-----1 | 32BSI | -9999 | f | 2 | 32BF | -9999 | f | 185 Working with Raster info the 1st band is equal to ahead of and the hot moment band has the right kind attributes (the 32BF pixel style and the NODATA worth of -9999) that we laid out in the decision to ST_MapAlgebra(). the true attempt although is to examine the precis statistics. WITH stats AS ( decide upon 1 AS bandnum, (ST_SummaryStats(rast, 1)). * FROM prism the place rid = 550 UNION ALL decide on 2 AS bandnum, (ST_SummaryStats(rast, 2)). * FROM prism the place rid = 550 ) decide on bandnum, count number, round(sum::numeric, 2) AS sum, round(mean::numeric, 2) AS suggest, round(stddev::numeric, 2) AS stddev, round(min::numeric, 2) AS min, round(max::numeric, 2) AS max FROM stats ORDER through bandnum; The output is as follows: bandnum | count number | sum | suggest | stddev | min ---------+-------+------------+---------+--------+-------1 | 7081 | 8987349. 00 | 1269. 22 | one hundred twenty five. 87 | 943. 00 2 | 7081 | 89873. forty nine | 12. sixty nine | 1. 26 | nine. forty three The precis information exhibit that band 2 is right (the band 1 price divided by way of a hundred. ). The values now make experience for the typical per month minimal temperature. the way it works... during this recipe, we utilized an easy map-algebra operation with ST_MapAlgebra() to right the pixel values. In a later recipe, we'll current a sophisticated map-algebra operation to illustrate the facility of ST_MapAlgebra(). 186 Chapter five Combining geometries with rasters for research within the earlier recipes, we ran uncomplicated records merely on one raster tile. although operating operations on a selected raster is excellent, it isn't very precious for answering actual questions. during this recipe, we'll use geometries to filter out, clip, and union raster tiles in order that we will solution questions for a selected region. preparing we'll use the San Francisco obstacles geometry formerly imported into the sfpoly desk. when you have no longer imported the limits, check with the 1st recipe of this bankruptcy for directions. find out how to do it... considering the fact that we're to examine rasters within the context of San Francisco, a simple query to invite is: what used to be the common temperature for January, 2012 in San Francisco? decide on ( ST_SummaryStats( ST_Union( ST_Clip(prism. rast, 2, ST_Transform(sf. geom, 4322), actual) ), 1 ) ). suggest FROM prism subscribe to sfpoly sf ON ST_Intersects(prism. rast, ST_Transform(sf. geom, 4322)) the place prism. month_year = '2012-01-01'::date; within the previous SQL question, there are 4 goods to be aware of, as follows: ff ST_Transform(): this system converts the geometry's coordinates from one spatial reference method to a different. remodeling a geometry is sometimes speedier than remodeling a raster. remodeling a raster calls for resampling the pixel values, a computationally-intensive method and one who may well introduce bad effects.

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