Flood Extent Mapping Using OpenDataKit

*Written by Hawa Adinani and Amelia Hunt* Since 2015, Ramani Huria has been tackling the issue of flooding in Dar es Salaam to reduce flooding and encourage sustainable water resource management. Now in the second phase of the project, Ramani Huria 2.0 is focusing on mapping the most flood prone Wards of Dar Es Salaam, such as Kigogo and Hananasif Wards, to produce flood extent information which will later be used to inform decision making and flood mitigation plans. The Ramani Huria team begin the community mapping process by introducing themselves to the…Read more

Community Outreach For Flood extent Mapping- Hananasif Ward

One of the primary tasks of Ramani Huria is to assess flood extent across Dar es Salaam - and community engagement is at the heart of this activity. It is through this engagement that we have access to well-informed local knowledge, adding a level of depth to our identification of flood-prone areas that can only offered by the community itself. Using information gathered out in the field, we are further able to create a time series - advancing the possibility of identifying historical trends of Dar es Salaam’s flood extent. Through this method,…Read more

Ground surveying as a community process

In Ramani Huria’s ground survey mapping activities, community members have always been part and parcel of the process. Their presence has consistently led to greater success and timely completion of mapping within their respective wards/areas. Why do we collaborate with community members? There are several reasons as to why Ramani Huria prefers to train community members to serve as mappers. To describe a few: They have local knowledge of the area within which they live. This means they know the ins and outs of the places being mapped due to the fact that…Read more

How to: Ground Survey Mapping with Aerial Imagery

The ground survey mapping process undertaken by the Ramani Huria team depends upon high quality aerial imagery. Mappers collect data on site with the help of the field papers produced by drone images (mbtiles) that offer direction and location to the mapper. Equipped with GPS units, Ramani Huria team members mapped all city centre wards using this approach. These include Kivukoni, Kisutu, Kariakoo, Jangwani, Gerezani, Mchafukoge, Upanga Mashariki and Upanga Magharibi. Ground survey process with the help of aerial imagery First visit the fieldpapers website and make field papers for the area upon…Read more

How to: Satellite Imagery

Whether mapping remotely or in the field, it is extremely useful to have an image of the area to be mapped. If you’re mapping remotely, an image from above is essential, and the higher resolution the image, the more detail you can map. While you can map in the field without a top down image of the area, it serves as a helpful tool to guide your work and allocated tasks. The images used in mapping, that are captured from space, are usually taken from a satellite link/contact and therefore referred to as…Read more

Mapping Dar es Salaam’s Water, Sanitation and Hygiene Facilities

WaSH is a collective term for water, sanitation and hygiene. While each is a separate field of work, they are interdependent in nature. After flooding, communities are very vulnerable to outbreaks of disease such as cholera. Building off a foundation of ongoing response efforts for this in Dar es Salaam, Ramani Huria has started a rapid sanitation mapping campaign within the city’s wards, mainly focusing on public toilets. With the well-trained Ramani Huria team available, this is approached by dividing the team into two groups with two different methods of data collection but…Read more

How to: Street View Mapping

Often when you think of maps, many people imagine only a view from above. Street view imagery allows maps to have an additional dimension, with a view from the ground, as if you were standing on the street! Sometimes also known as Mobile Mapping Imaging Systems, street view imagery can allow you a 360 horizontal (and sometimes also vertical) panoramic view from the ground. Street view imagery can be used in numerous ways, including to take virtual walks & explore landmarks, map key points of interest, and survey solutions. In remote mapping, combined…Read more

Mapping Bicycle Routes During Dar es Salaam’s Cycle Caravan

Each year, 5th June marks World Environment Day, a day for raising global awareness to take positive environmental action to protect nature and the planet Earth. This year’s Sunday 5th June saw UWABA (Umma wa Wapanda Baiskeli; or “Public Cycling Community”), a cycling community in Dar es Salaam in cooperation with European Union, organizing the cycle caravan. This is to support low carbon transport, to promote environmental alternatives to high carbon transport as well as putting emphasis on the presence (or absence) of bicycle roads/routes in the city. With the motivation to do…Read more

Participatory Mapping for Historical Flood Inundation Extents

As the neighbourhoods of Ramani Huria have been mapped, it is now possible to start building upon these maps. This can take many forms, but the community is at the heart of how these maps are being used. One approach is participatory mapping, where community members and local government leaders work together to sketch out the extents of historical flood events, drainage systems, ultimately mapping out flood prone areas. By sharing their historical flooding information, it is then possible to more accurately identify at-risk zones and propose temporary evacuation centers. So far, this…Read more

How to: JOSM (Java OpenStreetMap Editor)

JOSM (Java OpenStreetMap Editor) is a desktop application to conduct mapping activities, the data from which can be added to OpenStreetMap (OSM). It is an open source editor, written in Java. While initially the interface may seem daunting compared to some other editors, JOSM offers many features which are extremely useful and isn’t too difficult to master. Another major benefit of JOSM is that mapping can be done offline, unlike with other editors such as iD or Potlatch. This has been very useful when mapping Dar es Salaam as our mappers do not…Read more