Sri Lanka's drone pioneers

The International Water Management Institute (IWMI) in Sri Lanka has begun to experiment with drone technology to support a wide range of studies like crop monitoring, disaster mitigation and disease prevention.

In recent months, the Colombo based International Water Management Institute (IWMI) has begun to use unmanned aerial vehicles (UAVs) – also known as drones – to monitor rice crops in and around the water scarce area of Anuradhapura. The institute is testing the data-collecting capabilities of UAVs for various purposes. For example, RGB (red, green, blue) colour and near-infrared (NIR) sensors were used to capture images over the paddy fields. These technologies have the potential to help farmers detect fields that are under stress and to help them identify low-laying areas prone to pooling.

IWMI's drone is also regularly used in partnership with local authorities. In December 2015, the Survey Department of Sri Lanka was developing a disaster mitigation plan for Badulla, the capital city of Uva Province. The Survey Department needed a high-resolution Digital Elevation Model (DEM) of the town for the plan, and asked IWMI to use its drone to capture the required aerial imagery.

Using conventional techniques, it might have taken over a year to survey the town. However, the drone used by the IWMI team was able to survey the entire 10 square kilometres area in just three days, by carrying out fourteen UAV flights and shooting 4,600 high-resolution images, with an average spatial resolution of four centimetres.

.@IWMI_ in #SriLanka uses #sUAS to monitor #crop #disaster & #disease https://t.co/ftxUg2knyy #drones #DRR #aviation pic.twitter.com/Gc2oCbT73E

— Drones 4 Agriculture (@UAV4Ag) May 5, 2016

Disease prevention

Drone imagery can also be used to better understand the spread of disease, allowing health analysts to create high-quality maps. Chronic Kidney Disease of Uncertain Aetiology (CKDu) is one of the most serious non-communicable diseases presently afflicting Sri Lankans, and it remains poorly understood. First diagnosed in the mid-1990s, the disease has now been found to occur in six out of the nine Sri Lankan provinces. It is essentially confined to the dry zone and only affects farmers engaged in rice cultivation. CKDu is believed to have resulted in the death of approximately 25 thousand people to date, while over 8 thousand people are currently estimated to be receiving treatment for the condition.

In the CKDu-affected area of Mahiyangana, the disease is believed to be spread via contaminated drinking water, which originates from wells. The UAV has been used to gather geo-referenced data on where households live and where wells are located. The collected data can be used in addition to a digital elevation model to locate the high and low areas of two villages, Sara Bhoomi and Badulupura.

The gathered data has been used in support of a pilot project on prevention of CKDu in the area. According to project leader Ranjith Mulleriyawa, these aerial photos and maps have provided researchers with an improved overall picture of the area, helping them understand how contaminated wells are linked to the spread of CKDu in affected areas.

High accuracy

IWMI also plans drone initiatives in Nepal to map fresh water springs by using a small thermal sensor. The targeted watersheds in Nepal have dense canopy cover, and it is difficult to use standard optical sensors to identify and locate the springs. The drone-mounted thermal sensor can see through the dense canopy cover to find these springs, as their temperature is lower than the temperature of the earth surrounding them.

While the use of UAVs in research and other practical applications remains in its infancy, IWMI’s initial tests have already demonstrated their usefulness. Drones can be used to carry out surveys over large and hard-to-access areas, in a relatively short timeframe and with high accuracy. For policy experts and decision-makers, these aerial images can provide them with more accurate and up-to-date information than has hitherto been possible. For farmers, high-quality drone images can help them detect potential crop failure early, giving them enough time to respond.

IWMI thinks that UAV based surveys will be especially useful in studies that require highly accurate and repeated monitoring. These include checking for changes in cropping patterns, shifts in the status of important water resources, and documenting the extent of environmental disasters. It doubtless won't be long before farmers routinely use UAVs to monitor their crops, just as they use more conventional machinery to sow and harvest.

About the author:

Salman Siddiqui (S.Siddiqui@cgiar.org) is senior manager of the Geographic Information System (GIS), remote sensing and data management unit at the International Water Management Institute in Sri Lanka.

Source:

Republished with consent from http://ictupdate.int

Pastoralists seek water and peace in Chad: Account of a participatory mapping exercise in the Sahel

BAÏBOKOUM, CHAD: 31 July to 11 August 2012, the Association des Femmes Peules Autochtones du Tchad (AFPAT), in cooperation with the Secretariat of the Indigenous Peoples of Africa Coordinating Committee (IPACC), conducted a training course on Participatory 3 Dimensional Modelling in the area of Baïbokoum, Logone Oriental, in southern Chad.

The Chadian mapping project focused on training pastoralist activists from different parts of Chad, as well as from neighbouring countries and East Africa in the basics of cartography and how to conduct a Participatory 3D Modeling (P3DM) exercise with nomads and semi-nomadic M’bororo indigenous people in the Baïbokoum area.


Three-way dialogue on climate change from CTA on Vimeo.

Baïbokoum’s rural population is faced with competing resource challenges similar to other parts of Africa. These include changes in land use, notably encroachment by sedentary farmers, loss of biodiversity as a result of land use change, the impact of extractive industries and climate change impacts. All of these factors contribute to increasing human vulnerability, soil and biodiversity degradation, food insecurity and risks of conflict.

The Baïbokoum project followed on the November 2011 workshop in N’Djamena, Chad where pastoralists from AFPAT and the IPACC network met with the World Meteorological Organisation, UNESCO, CTA and the meteorological services of Chad to discuss climate adaptation and the risks experienced by nomadic communities in Africa today. The N’Djamena workshop led to the N’Djamena Declaration on traditional knowledge and climate adaptation which was presented at the 17th Conference of Parties to the UN Framework Convention on Climate Change.

Nomadic, semi-nomadic community members from the villages in the district then spent 3 days coding the map with the indigenous traditional knowledge; showing land use, traditional routes of cattle migration, ecosystem features, and biodiversity information. 

Trainees came to Baïbokoum from five different regions of Chad, as well as from Niger, Cameroon, Kenya, Tanzania and Uganda. Technical support and training was provided by Mr Barthelemy Boika from the Réseau des Ressources Naturelles in the Democratic Republic of Congo. Additional training and guidance was provided by the Secretariat of IPACC, from South Africa.

Trainees did practical work with ephemeral mapping, GPS skills training, elicitation of a vernacular language legend (in this case in Fufulde), and orientation on the basics of cartography, scaling and georeferencing.

They spent four days constructing a scaled, geo-referenced 3D model of Baïbokoum and environs (24km x 20 km; 1:10 000 scale).

The resulting Participatory 3D Model (P3DM) had some notably features, including the emphasis placed by pastoralists on different types of surface water – seasonal, permanent, swampy and flowing.

Herders also were able to identify six tree species which are protected under M’bororo customary law. The six species of trees, all of them with medicinal and ecosystems functions, may not be cut or damaged, and serve as navigation reference points over generations.

Herders’ main concerns revolved around the expansion of sedentary farmers who have blocked traditional transhumance routes that allow cattle access to potable water. Herders accuse the farmers of burning their fields, thus killing off biodiversity and including long protected tree species. Herders noted that there were now oil wells being dug in the adjacent territory and a pipeline that are creating pressure on them from both sides. Sudden shifts of weather and climate, including both droughts and floods have made them more vulnerable and increased the risk of armed conflict in the region.

Over sixty M’bororo community members participated in the mapping, as well as the trainees, villagers and school goers. Leaders in the community felt confident that the map could help alleviate simmering conflicts in the community.

His Excellency, the Governor of Logone Orientale

The event was formally closed on 10 August by His Excellency, the Governor of Logone Orientale, the President of the 5% Revenue from Oil Exploration, the Prefect and Deputy-Prefect of Baïbokoum, and representatives of the national Gendarmerie and Ministries of Livestock, Agriculture and the Department responsible for climate change.

The Governor immediately offered to mediate a process between sedentary and nomadic communities to restore transhumance corridors for herders to be able to access water again. Participants noted that sedentary and nomadic communities could have symbiotic and supportive relationships. Resolving conflicts and having a preventative approach to resolving resource competition is a fundamental aspect of climate adaptation and development of rural areas.

AFPAT Coordinator, Hindou Oumarou Ibrahim praised the government and community for their willingness to explore new avenues of cooperation. She noted the traditional importance placed by M’bororo men and women on nature conservation and has opened discussions with the President of the 5% oil revenues to look at how M’bororo herders can be more involved in protecting the threatened forest spaces in the mountains outside Baïbokoum.

The mapping process and examination of issues of conflict and peace building was documented by Jade Productions as a film to be released for the 18th Conference of Parties to the UN Framework Convention on Climate Change in Doha, Qatar. National media reported throughout the workshop on radio and then broadcast a television report after the closing protocol event.

The workshop took place during the holy month of Ramadan, which added an extra dimension of how religious teachings and values can also encourage people to work cooperatively, even in circumstances where they do not share a language between them. Indigenous herders from Kenya, Cameroon and Niger all joined their Chadian partners during the prayers and fasting during the two week workshop.

The event was generously supported by the Technical Centre for Agricultural and Rural Cooperation ACP-EU (CTA), with additional financial support from Bread for the World, Norwegian Church Aid and Misereor. Documents, photographs and videos can be seen on www.ipacc.org.za

Credits for text and images: Nigel Crawhall, IPACC

Ogiek Indigenous Peoples Mapping their Lands

Julius Muchemi, Executive Director of ERMIS Africa, an NGO based in Kenya, reports on a Participatory 3D Modelling exercise which occurred in Nessuit, Kenya in August 2006. In the course of the exercise - attended by representatives from 21 Ogiek clans - an area of 52,800 ha was mapped at a scale 1:10,000. participants included close to 120 representatives from the different clans, men and women. Elders populated the model with their memories dating back to 1925 and reconstructed the landscape as it was at that time. The model displays 64 data layers including different types of areas, points and lines. In 2008 the Ogiek people expanded the coverage of the model to include further 40,000 ha.

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