A map overlay alignment tool
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Our reference platform for GeoCam MapFasten is Ubuntu Linux 12.04 LTS, running Python 2.7.3 and Django 1.3. For development we use Django's built-in development web server with a SQLite 3.6 database. We also develop using Mac OS X 10.6+ but we won't talk about how to install dependencies on the Mac since it's more complicated.

For deployment we deploy to Google App Engine, using Google Cloud SQL for the database and App Engine blob storage to hold image data.

Set Up an Install Location

Let's create a directory to hold the whole MapFasten installation and capture the path in an environment variable we can use in the instructions below:

export GEOCAM_DIR=$HOME/projects/geocam # or choose your own
mkdir -p $GEOCAM_DIR

Get the Source

Check out our latest source revision with:

git clone git://github.com/geocam/geocamMapFasten.git geocamMapFasten

For more information on the Git version control system, visit the Git home page. You can install Git on Ubuntu with:

sudo apt-get install git-core

Optionally Install virtualenv (Recommended)

Especially for a quick test install, we recommend using the virtualenv tool to put GeoCam-related Python packages in an isolated sandbox where they won't conflict with other Python tools on your system.

To install virtualenv, create a sandbox named packages, and "activate" the sandbox:

sudo apt-get install python-virtualenv
mkdir virtualenv
cd virtualenv
virtualenv --system-site-packages geocamMapFasten
source geocamMapFasten/bin/activate

After your sandbox is activated, package management tools such as easy_install and pip will install packages into your sandbox rather than the standard system-wide Python directory, and the Python interpreter will know how to import packages installed in your sandbox.

You'll need to source the activate script every time you log in to reactivate the sandbox.

Install Non-Python Packages

First install Ubuntu packages:

# tools for Python package compilation and management
sudo apt-get install python2.7-dev python-pip

# database support for development in native django environment
sudo apt-get install sqlite3 libsqlite3-dev

# handling images
sudo apt-get install libpng-dev libjpeg-dev libfreetype6-dev libtiff-dev imagemagick

# must install PIL through Ubuntu package system, PyPI version fails on Ubuntu
sudo apt-get python-imaging

Set Up MapFasten

To install Python dependencies, render icons and collect media for the server, run:

cd $GEOCAM_DIR/geocamMapFasten
./manage.py bootstrap --yes
source $GEOCAM_DIR/geocamMapFasten/sourceme.sh
./manage.py prep

You'll need to source the sourceme.sh file every time you open a new shell if you want to run GeoCam-related Python scripts such as starting the Django development web server. The sourceme.sh file will also take care of activating your virtualenv environment in new shells (if you were in a virtualenv when you ran setup.py).

To initialize the database:

$GEOCAM_DIR/geocamMapFasten/manage.py syncdb

Try It Out

To run the Django development web server:

$GEOCAM_DIR/geocamMapFasten/manage.py runserver

Now you're ready to try it out! Point your browser to http://localhost:8000/ .

Deploying to App Engine

These instructions are a work in progress. Your feedback is appreciated!

Create an App Engine project, give it access to a Google Cloud SQL instance, and enable backend support.

Change the application field in app.yaml to the name of your App Engine project.

In the settings.py file, modify the DATABASES field to point to your Cloud SQL database:

    'default': {
        'ENGINE': 'google.appengine.ext.django.backends.rdbms',
        'INSTANCE': 'your cloud sql instance name',
        'NAME': 'your database name',

App Engine Python uses the appcfg.py script to upload your application to the App Engine servers. For testing purposes, you'll probably want to have development, staging, and deployment versions of your app. We handle this by always giving appcfg.py an explicit --version argument at the command line which overrides the version setting in app.yaml.

Note that by default all versions of your app will share the same backend called processing which is used to produce export archives. They will also share the same Cloud SQL database and blob storage instance as the live deployed version. Use caution!

To deploy, run:

cd $GEOCAM_DIR/geocamMapFasten
appcfg.py --oauth2 --version=$MYVERSION update .
appcfg.py --oauth2 backends . update processing

You should now be able to try out your app at http://yourapp.appspot.com/ .