TWIGA Disdro Network: How is it going in Kenya

My last blog was on how we developed Kenya’s disdro network, how the sensors work and how we transmit its data. The network with the new generation of the disdro sensors has now been running continuously for 6 months. We are now shifting focus on keeping the network active and, more importantly, share and display […]


Most geodata applications for food security are still in the pilot stage. Geodata specialists tend to look to general digitalisation initiatives for inspiration. The idea is to learn from them as they started earlier and are supposedly more advanced. Is this true? Apparently not, if you look at the latest World Bank report on digital […]


There is quite some interest in geodata applications for inclusive finance for smallholder farmers. The idea is that financial institutions can make their operations more effective and more efficient. Geodata companies are looking for a combination of new markets and solving societal problems. Applications are credit scoring, assessment of repayment rate and time, geo-location of […]

Using the South African GNSS network to monitor country-wide atmospheric water vapour

The South African GNSS network (TrigNet, counts 64 stations distributed all over the country, with inter-station distances ranging from 80 km to 300 km. The network provides users with data for both real-time and post-processing applications. An example of real-time service is the provision of RTK corrections to augment the positioning precision of the […]

Flood Mapping: Case of Narok County, Kenya

Floods, described as the overflow of water on a particular region that is normally dry due to heavy  rainfall or other weather related events by Doswell III. 94% of all hazard related economic  damages are caused by floods, thus providing an incentive to look into it. Narok county, specifically Narok town is a town that […]

Getting location right: from meter to cm positioning accuracy

Prototyping a low-cost continuous GNSS monitoring network for positioning and atmospheric purposes in Ghana Imagine you bought a plot of land and need to map the exact boundaries. However, your positioning device (often referred to as GPS) can only measure up to several meters accuracy unless you rent a very expensive positioning instrument. This situation […]

SAR-derived water vapor maps for meteorological applications: processing advancement.

Numerical Weather Prediction Models (NWPM) can significantly benefit from the ingestion of SAR-derived products like water vapor maps. In particular, the contribution of SAR data to NWPM forecasts can be very effective if two conditions are satisfied: the estimated water vapor maps must be ‘dense’ and they must cover wide areas. Water vapor maps are […]

How many ground observations should we aim at?

TWIGA focuses on the combination of remote sensing data and ground-based observations to run models and develop products. The quality and amount of ground-based observations determines the accuracy of data that is used for satellite calibration and modeling, such as crop models. Maintaining monitoring networks requires high resources, thus it is important to assess where […]