Thursday, August 17, 2017

Getting started with Raster and PostGIS - I

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Steps for loading a raster in PostGIS (PgSql 9.4/ PostGIS 2.2) and pull it from database to view in QGIS 2.14.17.

1. Generate SQL for raster [NOTE: Do not create PostGIS table name starts with underscore, it creates problem while adding raster to QGIS from PostGIS database using DB Manager]

        raster2pgsql -s 4326 -I -C -M -F -t 50x50 -N nan biodiv_ssolnw.tif > biodiv_ssolnw.sql






2. Import generated raster into PostGIS database [Make sure to enable postgis extension in db]

         psql -h localhost -U postgres -d ecolservicedb -f biodiv_ssolnw.sql

the output is:
Processing 1/1: ags_473038164.tif
BEGIN
CREATE TABLE

INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1


….
CREATE INDEX
ANALYZE
NOTICE:  Adding SRID constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding scale-X constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding scale-Y constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding blocksize-X constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding blocksize-Y constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding alignment constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding number of bands constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding pixel type constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding nodata value constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding out-of-database constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
NOTICE:  Adding maximum extent constraint
CONTEXT:  PL/pgSQL function addrasterconstraints(name,name,name,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean,boolean) line 53 at RETURN
 addrasterconstraints
----------------------

Thursday, January 10, 2013

pyKML - a Python library for generating and parsing KML

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pyKML is an open source Python library for generating, parsing, and modifying KML, the geo-spatial data language used by Google Earth, Google Maps and a number of other GIS platforms.

pyKML helps working with large and complex KML documents by leveraging the use of basic programming constructs (looping, branching, etc.). In this regard pyKML is similar to libkml, Google’s open source C++ library, but takes advantage of the highly readable syntax of the Python programming language and the processing capabilities of the popular lxml Python library.


pyKML v0.1.0 documentation :  http://packages.python.org/pykml/



Wednesday, April 18, 2012

How to connect spatial database(PostGIS) with QGIS?

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In this section, I am showing the 3 basic steps to connect PostGIS database with a widely used open source desktop based gis, QGIS. 

Step1: Install PostGIS with Spatial database support extension
i.                    If PostgreSQL is already installed è Launch ‘Application stack builder’ from startup menu in windows 7.
ii.                  Select the appropriate instance of PGSQL from dropdown list and Click NEXT.
iii.                Expand ‘Categories’è Expand ‘Spatial Extensions’ è Select appropriate PostGIS version(1.5)  for the already installed PGSQL version(8.4).
iv.                    Follow the instructions to install the PostGIS extension.

 

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