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<a class="" href="..">Geospacial Engineering with Docker, PostgreGIS and QGIS</a>
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<li><a class="toctree-l3" href="#1-build-a-postgis-docker-image">1. Build a PostGIS Docker Image</a></li>
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<li><a class="toctree-l3" href="#2-composing-multiple-images-with-docker-compose">2. Composing multiple images with docker compose</a></li>
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<li><a class="toctree-l3" href="#3-create-a-database-and-enable-postgis-with-pgadmin4">3. Create a database and enable PostGIS with PGAdmin4</a></li>
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<li><a class="toctree-l3" href="#links-and-reference">Links and Reference:</a></li>
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<a class="" href="../qgis/">Load data with QGIS</a>
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<h1 id="docker-postgis-and-pgadmin">Docker PostGIS and PGAdmin</h1>
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<p>In this article, I will show you how to:</p>
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<ol>
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<li>Create a Postgis docker image <code>FROM postgres</code> and publish it to <a href="https://hub.docker.com/">hub.docker.com</a>.</li>
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<li>Create a Geospacial Database environment in Docker Compose with PostGIS and PGAdmin4.</li>
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<li>Use PGAdmin4 to create a database an enable Geospacial extensions.</li>
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</ol>
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<h2 id="1-build-a-postgis-docker-image">1. Build a PostGIS Docker Image</h2>
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<ul>
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<li>A <code>Dockerfile</code> contains instructions to build an image.</li>
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<li>Start by extending an existing PostgreSQL 10 Debian image: <code>FROM postgres:10</code>.</li>
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<li>Use <code>apt-get</code> to install required PostGIS extensions.</li>
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<li>Use <code>docker build</code> to create the image, then push it to docker hub.</li>
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</ul>
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<h3 id="creating-the-dockerfile">Creating the <code>Dockerfile</code></h3>
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<pre><code class="docker"># Extend exiting PostreSQL 10 Debian image: https://hub.docker.com/_/postgres/
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FROM postgres:10
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MAINTAINER Mihai Criveti
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# Install PostGIS packages
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RUN apt-get update
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RUN apt-get install --no-install-recommends --yes \
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postgresql-10-postgis-2.4 postgresql-10-postgis-2.4-scripts postgresql-contrib
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</code></pre>
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<h3 id="building-the-image">Building the image</h3>
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<ul>
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<li>Turn the <code>Dockerfile</code> into a usable image using <code>docker build</code>.</li>
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<li>Tag the image with a namespace (the one used on Docker Hub): <code>cmihai</code></li>
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</ul>
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<pre><code class="bash">docker build --tag cmihai/postgis .
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</code></pre>
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<h3 id="uploading-the-image-to-docker-hub">Uploading the image to Docker Hub</h3>
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<ol>
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<li>Push the Dockerfile, README and docker-compose.yaml examples to github</li>
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<li>Test the image end to end</li>
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<li>Push the image to docker hub</li>
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</ol>
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<pre><code class="bash">export DOCKER_ID_USER="username"
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docker login
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docker push
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docker tag cmihai/postgis $DOCKER_ID_USER/my_image
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docker push $DOCKER_ID_USER/my_image
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</code></pre>
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<h2 id="2-composing-multiple-images-with-docker-compose">2. Composing multiple images with docker compose</h2>
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<ul>
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<li>PGAdmin4 is a web based PostgreSQL Administration and SQL Development environment.</li>
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<li>Docker Compose can link an existing <a href="https://hub.docker.com/r/dpage/pgadmin4/">dpage/pgadmin4</a> image from Docker Hub to <code>cmihai/postgis</code></li>
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<li>Login to <a href="http://localhost:5050">http://localhost:5050</a> <code>admin</code>:<code>admin</code> after running <code>docker-compose up</code></li>
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</ul>
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<h3 id="create-docker-composeyaml">Create <code>docker-compose.yaml</code></h3>
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<pre><code class="yaml">version: '3.1'
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services:
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postgis:
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image: cmihai/postgis
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container_name: postgis
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ports:
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- '5432:5432'
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environment:
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POSTGRES_PASSWORD: postgres
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volumes:
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- pgdata:/var/lib/postgresql/data
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pgadmin4:
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image: dpage/pgadmin4
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container_name: pgadmin4
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ports:
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- '5050:80'
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environment:
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PGADMIN_DEFAULT_EMAIL: admin
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PGADMIN_DEFAULT_PASSWORD: admin
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links:
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- postgis
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volumes:
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pgdata:
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</code></pre>
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<h3 id="starting-the-services">Starting the services</h3>
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<p>Use <code>docker-compose up</code> to start the services:</p>
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<pre><code>docker-compose up
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</code></pre>
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<h2 id="3-create-a-database-and-enable-postgis-with-pgadmin4">3. Create a database and enable PostGIS with PGAdmin4</h2>
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<ol>
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<li>
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<p>Login to pgadmin4: <a href="http://localhost:5005">http://localhost:5050</a> with admin:admin</p>
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</li>
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<li>
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<p>Add a connection to postgis with user/pass <code>postgres</code>:<code>postgres</code> <img alt="create-server.png" src="create-server.png" /></p>
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</li>
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<li>
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<p>Create a new database and call it <code>gis</code> <img alt="create-database.png" src="create-database.png" /></p>
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</li>
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<li>
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<p>Open the SQL Query Tool on the newly created <code>gis</code> database:
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In the Browser window, select <em>Servers > postgis > Databases > gis</em>, the run <em>Tools > Query Tool</em> from the <em>Menu</em>.</p>
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</li>
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<li>
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<p>Run the following SQL code to enable postgis database extensions:</p>
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</li>
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</ol>
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<pre><code class="sql">-- Enable PostGIS (includes raster)
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CREATE EXTENSION postgis;
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-- Enable Topology
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CREATE EXTENSION postgis_topology;
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-- Enable PostGIS Advanced 3D and other geoprocessing algorithms
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CREATE EXTENSION postgis_sfcgal;
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-- Fuzzy matching needed for Tiger
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CREATE EXTENSION fuzzystrmatch;
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-- Rule based standardizer
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CREATE EXTENSION address_standardizer;
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-- Example rule data set
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CREATE EXTENSION address_standardizer_data_us;
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-- Enable US Tiger Geocoder
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CREATE EXTENSION postgis_tiger_geocoder;
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</code></pre>
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<h3 id="expected-outcome-gis-database-with-geospacial-extensions">Expected Outcome: <code>gis</code> database with geospacial extensions</h3>
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<ul>
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<li><code>Query returned successfully</code>:
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<img alt="enable-postgis.png" src="enable-postgis.png" /></li>
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<li><em>gis > Extensions</em> now lists a number of GIS extensions: <code>postgis, postgis_sfgal, postgis_tiger_geocoder, postgis_topology, fuzzystrmatch, address_standardizer and address_standardizer_data_us</code>.</li>
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<li><em>gis > Schema > public > Functions</em> has been populated with a high number (1000+) of GIS specific functions.</li>
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<li>A new table called <code>spacial_ref_sys</code> is now available under <em>gis > Schemas > public > Tables</em>.</li>
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<li>New schemas: <code>tiger</code>, <code>tiger_data</code> and <code>topology</code> have been created.</li>
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</ul>
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<h3 id="next-steps">Next Steps:</h3>
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<ul>
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<li>Load Geospacial data from shapefile, KML, GeoJSON, etc.</li>
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<li>Connect GIS Desktop clients such as QGIS.</li>
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<li>Connect to PostGIS using Python (ex: geopandas).</li>
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<li>Perform geospacial queries and analysis on the data.</li>
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</ul>
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<h2 id="links-and-reference">Links and Reference:</h2>
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<ul>
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<li>Github Repository with Dockerfile and docker-compose.yaml: <a href="https://github.com/crivetimihai/geospacial-engineering">https://github.com/crivetimihai/geospacial-engineering</a></li>
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<li>Docker Image: <a href="https://hub.docker.com">https://hub.docker/com</a></li>
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</ul>
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