This repository is intended to be used as a base template to use for development of custom applications. It contains several commonly used elements implemented in separate pages so that developers can remove or combine them to build interfaces addressing complex use-cases.
- Python 3.9
- Django 4.1.3
- Bootstrap 5.2.2
- Google Earth Engine Python API
- Home page is the welcome page that has the description of the application along with navigation provided to the various available templates.
- There are three types of map templates
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Display WMS data using fixed-size view
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Display WMS data using full screen view
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Display GEE data using a fixed-size view
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- All the charts use HighCharts library to generate the chart using data. There are three types of chart templates:
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Chart from netCDF file
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Chart from SQLite data model
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Chart from ClimateSERV API
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- To update data model details, please login using the 'Login' button in the menu bar. It will redirect you to your
Google(Gmail) login page. After you are authenticated, navigate to the "Update Data Model" page from the home page.
Here, you will see the form that allows you to enter details and submit to the server.
- This page lets the user draw a polygon and download corresponding GEOJSON file.
- This page has information about the project, team and logos
- A sample google form is used to collect feedback information for the application.
This application template is built using Bootstrap, based on https://startbootstrap.com/theme/sb-admin-2
- Clone and run the AppTemplate2022 This will give you the opportunity to see the look and feel of the application. You will also be able to view the project structure and all of the template code. At this stage you should start to think about which features would be useful in your specific application.
- Start a new project This will allow you to have a unique project name that fits your purpose.
- Bring the WebApp and templates directories from the AppTemplate2022 into your new project.
- Begin modifying the code to use just the features your application needs and connect your data to the application.
- Create a new github repo for your application where you can push updates for version control as well as make it easier to get assistance when needed.
- Publish your application to a web server.
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Open a terminal or command prompt on your computer.
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Navigate to the directory where you want to clone the repository.
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Run the command git clone https://github.com/SERVIR/AppTemplate2022.git
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Press Enter. This will start the cloning process and create a copy of the repository on your computer in the current directory.
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After the cloning process is finished, you will find a new directory named AppTemplate2022. This directory contains the full copy of the repository including all the files and the full git history.
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You can navigate to the newly created directory and start checking it out.
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To view the Earth Engine examples you will need an EE account, if you do not currently have one you can sign up https://earthengine.google.com/signup
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Next you will need to create a google cloud project where you will enable EE and Google Authentication for your project. Navigate to https://console.cloud.google.com/projectcreate
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Follow the prompts to create the project, you may want to name it Your_Project_Name so you can skip this part when you set up your application.
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After you create the project you must select it from the dropdown in the top
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In the left panel under APIs & Services click the "OAuth consent screen" link, then fill out the form with the information for your application. There are a few pages with choices, proceed when finished.
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In the left panel click "Credentials" link
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At the top left click + Create Credentials and select "OAuth 2.0 Client ID"
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In the dropdown select "Web Application" and give a name.
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In the App Domain fields use the the dev domains for example:
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Add Authorized JavaScript origins (you may enable multiple)
- Examples:
- http://localhost:8000
- http://127.0.0.1:8000
- https://your_domain
- Examples:
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Add Authorized redirect URIs (you may enable multiple)
- Examples:
- http://localhost:8000/accounts/google/login/callback/
- http://127.0.0.1:8000/accounts/google/login/callback/
- https://your_domain/accounts/google/login/callback/
- Examples:
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Copy and save the Client ID and Client secret to your local machine (you will need these later)
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Click DOWNLOAD JSON and save
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Click save
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Click Enabled APIs & Services then click the + Enable APIS AND SERVICES link at the top
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Search for Earth Engine, click it, then click enable.
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Click Create Credentials again and select service account
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Fill out information and click CREATE AND CONTINUE.
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Click Select a role and scroll to Earth Engine, then select Earth Engine Resource Viewer
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Register the service account https://signup.earthengine.google.com/#!/service\_accounts
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Before you can run the application you will need to create a data.json file in the root directory. In this file you will need the following:
{ "SECRET\_KEY": "your\_secret\_key", "ALLOWED\_HOSTS": \["localhost", "127.0.0.1"\], "CSRF\_TRUSTED\_ORIGINS": \["http://localhost:8000","http://127.0.0.1:8000"\], "private\_key\_json" : "your\_json\_key", "DATA\_DIR" : "your\_data\_path", "service\_account" : "your\_service\_acccount", "sample\_netCDF": "https://thredds.servirglobal.net/thredds/fileServer/mk\_aqx/geos/20191123.nc" } -
SECRET_KEY is any random string of characters
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ALLOWED_HOSTS is the domain you will be accessing the site from, in development it will be left as is, in production you will remove those and add your actual domain
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CSRF_TRUSTED_ORIGINS: similar to above except this needs the http or https protocol added
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private_key_json: is the json file you downloaded from the google console
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DATA_DIR: is a path to any data that will need to be accessed. In the AppTemplate you will also need the sample data which you can download from https://thredds.servirglobal.net/thredds/fileServer/mk\_aqx/geos/20191123.nc and place it in the DATA_DIR in a directory named geos
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Service_account is the service account you created above
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sample_netCDF is just a pointer to the download, there is no need to change this.
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In the terminal run conda env create -f environment.yml
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When the environment is created run conda activate SERVIR_AppTemplate
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Run the command python manage.py migrate
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Setup Site by running the following
python manage.py shell from django.contrib.sites.models import Site site = Site() site.domain = '{REPLACE WITH YOUR DOMAIN}' site.name = '{REPLACE WITH YOUR DOMAIN}' site.save() Site.objects.all().values() exit() -
Look for your domain in the printed QuerySet and the id of the object. This is your SITE_ID which needs to be changed in settings.py if it is not the same.
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Run the command python manage.py runserver
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Create a super user by running python manage.py createsuperuser
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Start the server by running python manage.py runserver If you have an IDE like PyCharm you can just set up the project to run with the Run/Debug Configurations.
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Navigate to http://127.0.0.1:8000/admin/ and login with your superuser
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Add a social application with your Client ID and Secret that you saved when creating the credentials in the cloud console.
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While in the admin pages you should add a station or two, along with an organization.
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Now you can open a browser and navigate to port http://127.0.0.1:8000/ unless you specified a different port in your configuration.
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For the Chart from SQL Database to show data you will have to go to the “Use forms to enter data” example and add some data points for it to graph.
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In a browser navigate to https://pypi.org/project/SERVIR-Template-CLI/ and follow the installation instructions. If you have already created the cloud application and keys from cloning, you may skip those steps and use the same ones rather than creating new ones.
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Now you can start modifying the site. You can start by mapping out what features you would like your application to have. Then reading the information in the “Learn how to modify this page” popup.
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Github has full instructions for adding existing code to a new repo https://docs.github.com/en/get-started/importing-your-projects-to-github/importing-source-code-to-github/adding-locally-hosted-code-to-github
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- Of course the endgame of this is to get your application published and visible to the public. There are hundreds or likely thousands of ways to publish a website. I will explain one of them, publishing to Ubuntu using nginx and gunicorn. Feel free to publish differently if you would like.
- You will need conda, nginx, and gunicorn installed before you start. There are enough resources explaining in depth how to install them, so I will avoid duplicating this information.
- Follow the directions from Clone AppTemplate above using your repo that you just created instead of the template. Make sure you use the domain that will be pointing to your website instead of 127.0.0.1:8000 in all locations. Because this is a production website, you will not need to runserver. So stop at direction cc for now.
- Run the command python manage.py collectstatic
- Add a service to start the application
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Create a file located /etc/systemd/system name it your_project_name.service Do not use and dashes.
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In the file edit and add the following
\[Unit\] Description=your\_project\_name daemon After=network.target \[Service\] User=nginx Group=nginx SocketUser=nginx WorkingDirectory={REPLACE WITH PATH TO APPLICATION ROOT}/your\_project\_name accesslog = "/var/log/your\_project\_name/your\_project\_name\_gunicorn.log" errorlog = "/var/log/your\_project\_name/your\_project\_name\_gunicornerror.log" ExecStart={REPLACE WITH FULL PATH TO gunicorn IN YOUR CONDA ENV}/bin/gunicorn --timeout 60 --workers 5 --pythonpath '{REPLACE WITH PATH TO APPLICATION ROOT},{REPLACE WITH FULL PATH TO YOUR CONDA ENV}/lib/python3.9/site-packages' --bind unix:{REPLACE WITH LOCATION YOU WANT THE SOCK}/your\_project\_name\_prod.sock wsgi:application \[Install\] WantedBy=multi-user.target -
Create a file in /etc/nginx/conf.d named your_project_name_prod.conf and edit and paste the following
upstream your\_project\_name\_prod { server unix:{REPLACE WITH LOCATION YOU WANT THE SOCK}/your\_project\_name\_prod.sock fail\_timeout=0; } server { listen 443; server\_name {REPLACE WITH YOUR DOMAIN}; add\_header Access-Control-Allow-Origin \*; ssl on; ssl\_certificate {REPLACE WITH FULL PATH TO CERT FILE}; ssl\_certificate\_key {REPLACE WITH FULL PATH TO CERT KEY}; # Some Settings that worked along the way client\_max\_body\_size 8000M; client\_body\_buffer\_size 8000M; client\_body\_timeout 120; proxy\_read\_timeout 300; proxy\_connect\_timeout 300; proxy\_send\_timeout 300; fastcgi\_buffers 8 16k; fastcgi\_buffer\_size 32k; fastcgi\_connect\_timeout 90s; fastcgi\_send\_timeout 90s; fastcgi\_read\_timeout 90s; location = /favicon.ico { access\_log off; log\_not\_found off; } location /static/ { autoindex on; alias /your\_project\_name/staticfiles/; } location / { proxy\_set\_header Host $http\_host; proxy\_set\_header X-Real-IP $remote\_addr; proxy\_set\_header X-Forwarded-For $proxy\_add\_x\_forwarded\_for; proxy\_pass http://unix:{REPLACE WITH LOCATION YOU WANT THE SOCK}/your\_project\_name\_prod.sock ; } } # Reroute any non https traffic to https server { listen 80; server\_name {REPLACE WITH YOUR DOMAIN}; rewrite ^(.\*) https://$server\_name$1 permanent; } -
Create Alias commands to make starting the application simple by creating a file located /etc/profile.d named your_project_alias.sh for this you will need a short acronym for you application i’ll use myapp as an example
alias myapp='cd {REPLACE WITH PATH TO APPLICATION ROOT}' alias actmyapp='conda activate your\_project\_name' alias uomyapp='sudo chown -R ${USER} {REPLACE WITH PATH TO APPLICATION ROOT}' alias somyapp='sudo chown -R www-data {REPLACE WITH PATH TO APPLICATION ROOT}' alias myappstart='sudo service your\_project\_name restart; sudo service nginx restart; somyapp' alias myappstop='sudo service your\_project\_name stop' alias myapprestart='myappstop; myappstart' -
Now activate the alias file by running source /etc/profile.d/your_project_name_alias.sh
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Now you can start the site by running myappstart
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When you need to pull any updates from github you will run the following
- myapp (changing you to the home directory)
- actmyapp (activating your environment)
- uomyapp (taking ownership of the app directory)
- git pull (gets the updates)
- python manage.py collectstatic (collects the static files)
- myapprestart (starts the application and gives the server back the ownership of the directory)
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Please feel free to contact us if you have any questions.
- Githika Tondapu (NASA/USRA)
- Francisco Delgado (NASA/USRA)
- Lance Gilliland (NASA/JACOBS)
- Billy Ashmall (NASA/USRA)
This application is built and maintained by SERVIR under the terms of the MIT License. See LICENSE for more information.
This applications abides to all of SERVIR's privacy and terms of use as described at https://servirglobal.net/Privacy-Terms-of-Use.
The SERVIR Program, NASA and USAID make no express or implied warranty of this application as to the merchantability or fitness for a particular purpose. Neither the US Government nor its contractors shall be liable for special, consequential or incidental damages attributed to this application.