ThinkHazard

A natural hazard screening tool for disaster risk management project planning. ThinkHazard! is maintained by the Global Facility for Disaster Reduction and Recovery (GFDRR). Provides classified hazard level (very low to high) for any location in the world, and advice on managing disaster risk, plus useful reports and contacts, for 11 natural hazards.

API instructions can be found here: https://github.com/GFDRR/thinkhazard/blob/master/API.md

Getting Started

The following commands assume that the system is Debian/Ubuntu. Commands may need to be adapted when working on a different system.

Build docker images:

make build

Run the composition:

docker compose up -d
make initdb

Now point your browser to http://localhost:8080.

Run checks and automated tests:

make check test

Initialize a fresh database

Install postgres unaccent extension database engine :

sudo apt install postgresql-contrib

Edit /etc/postgresql/9.5/main/postgresql.conf, and set max_prepared_transactions to 10

Create a database:

sudo -u postgres createdb -O www-data thinkhazard_admin
sudo -u postgres psql -d thinkhazard_admin -c 'CREATE EXTENSION postgis;'
sudo -u postgres psql -d thinkhazard_admin -c 'CREATE EXTENSION unaccent;'
sudo -u postgres createdb -O www-data thinkhazard
sudo -u postgres psql -d thinkhazard -c 'CREATE EXTENSION postgis;'
sudo -u postgres psql -d thinkhazard -c 'CREATE EXTENSION unaccent;'

If you want to use a different user or different database name, you’ll have to provide your own configuration file. See “Use local.ini” section below.

Create the required schema and tables and populate the enumeration tables:

make populatedb

Note: this may take a while. If you don’t want to import all the world administrative divisions, you can import only a subset:

make populatedb DATA=turkey

or:

make populatedb DATA=indonesia

In order to harvest geonode instance with full access, you need to create and configure an API key. On geonode side:

• create a superuser with following command:

python manage.py createsuperuser

• Then, create api keys for all users with:

python manage.py backfill_api_keys

• Finally, you can display all api keys with:

SELECT people_profile.id, username, key
FROM people_profile
LEFT JOIN tastypie_apikey ON (tastypie_apikey.user_id = people_profile.id)

On Thinkhazard side:

• Change username and api_key value according to previous setup in thinkhazard_processing.yaml file.

You’re now ready to harvest, download and process the data:

make harvest
make download
make complete
make process
make decisiontree

For more options, see:

make help

Processing tasks

Administrator can also launch the different processing tasks with more options.

docker compose run --rm thinkhazard harvest [--force] [--dry-run]

Harvest metadata from GeoNode, create HazardSet and Layer records.

docker compose run --rm thinkhazard download [--title] [--force] [--dry-run]

Download raster files in data folder.

docker compose run --rm thinkhazard complete [--force] [--dry-run]

Identify hazardsets whose layers have been fully downloaded, infer several fields and mark these hazardsets complete.

docker compose run --rm thinkhazard process [--hazardset_id ...] [--force] [--dry-run]

Calculate output from hazardsets and administrative divisions.

docker compose run --rm thinkhazard decision_tree [--force] [--dry-run]

Apply the decision tree followed by upscaling on process outputs to get the final relations between administrative divisions and hazard categories.

Publication of admin database on public site

Publication consist in overwriting the public database with the admin one. This can be done using :

make publish

And this will execute as follow :

• Lock the public site in maintenance mode.
• Store a publication date in the admin database.
• Backup the admin database in archives folder.
• Create a new fresh public database.
• Restore the admin backup into public database.
• Unlock the public site from maintenance mode.

Configure admin username/password

Authentication is based on environment variable HTPASSWORDS which should contain usernames and passwords using Apache htpasswd file format.

To create an authentification file .htpasswd with admin as the initial user:

htpasswd -c .htpasswd admin

It will prompt for the passwd.

Add or modify username2 in the password file .htpasswd:

htpasswd .htpasswd username2

Then pass the content of the file to environment variable:

environment:
  HTPASSWORDS: |
    admin:admin
    user:user

Analytics

If you want to get some analytics on the website usage (via Google analytics), you can add the tracking code using an analytics variable:

environment:
  ANALYTICS: UA-75301865-1

Feedback

The feedback_form_url can be configured in the production.ini file.

Configuration of processing parameters

The configuration of the threshold, return periods and units for the different hazard types can be done via the thinkhazard_processing.yaml.

After any modification to this file, next harvesting will delete all layers, hazardsets and processing outputs. This means that next processing task will have to treat all hazardsets and may take a while (close to one hour).

hazard_types

Harvesting and processing configuration for each hazard type. One entry for each hazard type mnemonic.

Possible subkeys include the following:

• hazard_type: Corresponding hazard_type value in geonode.

• return_periods: One entry per hazard level mnemonic with corresponding return periods. Each return period can be a value or a list with minimum and maximum values, example:

  return_periods:
      HIG: [10, 25]
      MED: 50
      LOW: [100, 1000]

• thresholds: Flexible threshold configuration.

  This can be a simple and global value per hazardtype. Example:

  thresholds: 1700

  But it can also contain one or many sublevels for complex configurations:

  1. global and local entries for corresponding hazardsets.
  2. One entry per hazard level mnemonic.
  3. One entry per hazard unit from geonode.

  Example:

  thresholds:
    global:
      HIG:
        unit1: value1
        unit2: value2
      MED:
        unit1: value1
        unit2: value2
      LOW:
        unit1: value1
        unit2: value2
      MASK:
        unit1: value1
        unit2: value2
    local:
      unit1: value1
      unit2: value2

• values: One entry per hazard level, with list of corresponding values in preprocessed layer. If present, the layer is considered as preprocessed, and the above thresholds and return_periods are not taken into account. Example:

  values:
    HIG: [103]
    MED: [102]
    LOW: [101]
    VLO: [100, 0]

Translations

ThinkHazard! is translated using Transifex.

Workflow

We use lingua to extract translation string from jinja2 templates.

Use the following command to update the gettext template (.pot):

make extract_messages

Note: this should be done from the production instance ONLY in order to have the up-to-date database strings extracted! You will have to make sure that the ~/.transifexrc is valid and the credentials correspond to the correct rights.

Then you can push the translation sources to transifex.

make transifex-push

Once the translations are OK on Transifex it's possible to pull the translations:

make transifex-pull

Don't forget to compile the catalog (ie. convert .po to .mo):

make compile_catalog

Development

There are 3 different ways to translate strings in the templates:

• translate filter

  This should be used for strings corresponding to enumeration tables in database.

  {{ hazard.title | translate }}
  

• gettext method

  To be used for any UI string.

  {{gettext('Download PDF')}}
  

• model class method

  Some model classes have specific method to retrive the value from a field specific to chosen language.

  {{ division.translated_name(request.locale_name)}}