Version 21 (modified by Nuwan Waidyanatha, 8 years ago) ( diff )


SAMBRO Mobile Application


The app is supposed to be a mobile app to issue alerts for several hazards to be included into SAMBRO/Sahana.

The app will complement the web based GUIs for issuing alerts to enable a mobile solution even working in areas with weak internet connectivity.

An existing similar solution is mobile4D, a bi-directional hazard reporting and alerting tool developed at the Capacity Lab at the University of Bremen.


<Who will be the users of the solution?>
<Who else will be affected by this solution? eg. Developers, Users of Existing Functionality that may be changed?>
<How will stakeholders be affected?>
Tip: Engage these stakeholders in the development of your BluePrint.

User Stories

An authorized user finds himself in a situation where he/she is in the need to issue an alert, but does not have access to a computer or/and a sufficiently stable internet connection. The user can now use the app and fill in the data via a structured interface. After confirming the data, the app takes over and sends the data to the Sahana server as soon as internet connection is available again without the user having to take care of it. (Alternatively, the app uses SMS to send the data. This is transparent to the user.)


  1. Heavy rains have caused a bridge, over a river, and surrounding area to be inundated with flood waters. The bridge accommodates a rail road track and motor vehicle lanes. The local police must issue an alert to inform the transportation authorities (rail road and motor vehicle) and the public in the area of the of the situation. The Police Superintendent in the area will use his mobile phone to issue an alert. He/She will access the designated SAMBRO server to login and then begin creating a new alert. He/She will select the relevant flood CAP template and add/edit information including drawing a polygon on the map indicating the effected area. Thereafter, the alert is issued. The designated person at the National Disaster Management Organization will receive an SMS and Email requesting to authorize the message. The person will login to the SAMBRO server, using their mobile phone, and approve (or disapprove) the alert message. If approved, the SAMRBO server will issue alerts to all alert subscribers (including first responders) in the area through SMS and Email. The SAMBRO server will determine the cell towers that are in the demarcated alert area polygon to broadcast the alert through a cell broadcast message to the mobile phones covered by those cell towers.



<Group requirements in subsections, e.g. etc.> < requirements> <Identify different types of requirements:>


  • Simple interface
  • step by step input
  • must work without internet connectivity
  • alerts are a buffered and automatically sent as soon as the internet connection comes up again
  • satisfies a subset of CAP




  • Results are sent out in CAP

System Constraints

The system has to be operational by late March.


<Where relevant include alternative design options>

Data Model

(e.g. EER or class diagrams)


<Diagrams or Pseudocode>

Site Map

<for User Interface solutions>


<for User Interface solutions>


Current Implementation

Currently, there is no implementation within Sahana Eden.

  • Step 1. Test the current SAMBRO GUIs for its responsiveness to mobile handhelds. If necessary suggest some GUI tweaks to harmonize the desktop version with the mobile screens.
  • Step 2. Design hazard specific alert authoring and issuing GUIs. For example, Alerting Authorities, in a local area (Barangay, Gramaniladari, Thaluk, etc) do not need the full CAP message but a few attributes like the area and water level. We will target on delivering 3-5 mobile GUIs for Landslide, Flood, Accident,
  • Step 3. Develop the requirements/design for using the concept of Pictographs in Alerting and other features such as a wake up function to sound an Audible Alarm etc. I think we should do the same with the web GUI such that we can set a siren audio to sound for a specific warning_priority threshold.

We may have to look for funding outside of the ESCAP project for step 3. I would propose to have a standalone solution for Step 3 and concentrate on the alert-issuing part first.

Planned Implementation

To meet the time constraints given above, the plan is as follows:

  • Use a stripped-down version of the mobile4D mobile client (for Android)
  • enhance the functionality by the needed report types not supported yet
  • have the client deliver valid CAP directly from the device (the current implementation uses the mobile4D protocol and converts this to CAP server-sided)

The current functionality includes:

  • Send hazard reports:
    • filling in needed fields (numbers, contact details, urgency, etc.)
    • detect the current location
    • alternatively give a location and specifying a polygon on a map
  • Buffer issued reports and re-send them upon network connectivity.
  • Retrieve alerts and display them as list and map. This will most probably not be included.
  • Many more communication features that might not be included either.

Future Extensions

  • Send SMS when no TCP/IP network is available.

Outstanding Questions

  • Photos: does CAP support photos? Should photos be sent from within the app?


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