First Impressions of Ramani Huria

Currently 70% of the infrastructure in Dar es Salaam is unplanned, meaning that structures are often built in flood areas and are not adequately built to cope with high waters. Often, even unplanned buildings that are relatively ‘safe’ from flooding have huge consequences on the surrounding area; improper planning has led to an increase of compact soil, which has low absorption rates to help disperse water during floods. Ramani Huria is a project lead by HOT, with the aim to produce maps with the main intention of improving flood resilience planning and raising…Read more

Drain Mapping for Flood Modelling

Ramani Huria 2.0 is collecting drainage information in the most flood prone areas across Dar es salaam. This information is used to develop a flood model which requires accurately collected specifications of drains such as depth, width, blockage (by either vegetation or material), connectivity, and diameter (typically for culverts). To develop this model, Ramani Huria is working with a hydrologist in Deltares- Netherlands, Hessel Winsemius. Dr Hessel is an expert in the field of hydrology, with particular applications in global and regional flood risk modelling. This week he was in Dar es Salaam,…Read more

State of The Map Conference – Tanzania 2017

On the 8th to 10th December Crowd2Map collaborated with Ramani Huria to host the first state of the map conference in Dar es Salaam, Tanzania. We initially expected 150 participants but the number of attendees exceeded our estimates and reached 170 attendees from across 10 countries: Malawi, Kenya, Uganda, Rwanda, Zambia, Germany, America, Canada, Italy and Tanzania itself. It was an event where people from diverse background came together to train, network and interact.  Participants;  The great success of the conference came from the diverse background of the participants. The attendees ranged from…Read more

Maptime; Mapping for HIV/AIDS -World AIDS Day 2017

In honour of world AIDS day 2017, Ramani Huria and Data Lab Tanzania (dLab) co-hosted a maptime event to increase impact through transparency, accountability and partnership. The aim was for people to learn how to map to increase freely accessible public information on HIV/AIDS in districts across Tanzania. We decided to map Geita district in the lake Victoria zone as this district is one of the leading in Gender based violation and irreversible disability caused by such violation. It's clear that areas that experience gender violation also have higher rates of HIV/AIDS transmission.…Read more

Building open tools to map drains

Ramani Huria's goal is resilience: to reduce the human impact of flooding. The most obvious way to do this is to reduce the likelihood of floods! Drainage is one of the ways to do so. The drainage system in Dar es Salaam is enormous and complex, with hundreds of thousands of drains, often alongside roads, ranging from enormous 3-meter-deep concrete channels along highways to 5-cm-deep hand-dug ditches draining individual home sites. To help reduce flooding, we can map the drains and analyze them in specialized hydrological modelling software. This can allow us to…Read more

Ramani Huria 2.0 Launch

On September 26th, the new era of Ramani Huria 2.0 was officially launched at Julius Nyerere International Convention Center, an event attended by key project stakeholders, including government officials, university officials, Red Cross members, mapping experts, community members, and, of course, the students of Ramani Huria.  Professor Evaristo Liwa, Vice Chancellor of Ardhi University, gave opening remarks that commenced with a briefing on the previous iteration of Ramani Huria - a project that successfully produced maps for 21 wards of the city, home to approximately 1.3 million residents. He noted that this scaled…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

The art of drainage mapping in Dar es Salaam

One of the main goals of Ramani Huria 2.0 is to scale up all drainage mapping efforts that were previously executed during the project’s pilot. Students have now been grouped into specialized groups to ease coordination and delegate according to skillset. These groups include: Drainage Team, GIS Team, Open MapKit Team, Community Outreach team and Remote Mapping Team. There was no clearly identified method for mapping drains, so our team had to test most of the known field mapping applications. After testing these applications, the GeoTrace feature, coupled with its ability to enable…Read more

Remote Mapping Quality Control

Scaling up a field mapping project within a city of over 5 million people requires proper planning and training. We first wanted to give our field mappers a thorough overview of how data is inputted into OSM to ensure a clear understanding of the OSM ecosystem and how it works. At a later stage, we will be showing them how OSM data can be used for several different purposes. Teaching 300 new mappers how to map, however, comes with certain challenges. All of our mappers have been beginners, and most of them have…Read more

Mapping At Scale

The new and expanded Ramani Huria 2.0 team, with just over three hundred students, is now getting to work with the practical work of field data collection and editing the digital map of Dar es Salaam. We've installed OpenDataKit (ODK), a free software toolset for data collection on Android smartphones. We'll be using some more sophisticated data collection systems such as OpenMapKit, a variant of ODK that allows direct interaction with OpenStreetMap data, but the venerable and mighty original ODK is a great place to start. We begin with practice surveys at in…Read more