Epidemiology & Technology

Blog Archive

MEDRES Custom fork of ODK Collect

green and red metal trash bins
GitHub Repository: drguptavivek/collectLast Updated: January 28, 2026Version: v2025.3.3-MEDRES-RC4Backend (ODK Central): Custom fork designed to work in tandem with MEDRES Collect Why MEDRES Exists Field medical research in resource-constrained environments faces unique challenges that standard data collection tools don't address. Researchers work in remote areas with unreliable connectivity, share devices across

Understanding GeoJSON data

GeoJSON files are a standard way of storing GIS data These contain not only the coordinates but also the attribute data. These files have a key: value based hierarchial data structure You may think of these keys as variable names and values as the dara. In computer science terminology, these are

Removing and Updating GEOJSON Layers in Leaflet Maps, Using LayerGroups in Leaflet

person holding red round medication pill
Use Case: Let us map it Directrory structure The html has a state selection dropdown The state geoJSONs are saved as 1.geojson, 2.geojson etc in the geo directory. We attach an event listner to the Dropdown Select control and show state layers absed on selection So what are these layergroups?

Making a HTML Table from GeoJSON data

GeoJSON objects have a "Type" : "FeaturesCollection" property and a "Features" property whose value is an array of objects. Each child object of this has "type" = "feature", "geometry" = containes the GIS Coordinate data"properties" = contains the attribute data - Name, address, contact, facilities, serivices, whjatever catches your fancy

Loading GeoJSON data with Leaflet Maps

Loading GeoJSON data files can be network intensive if the GIS data has good resolution or if the number of features being added is high. In such scenario, it is better to load the GeoJSON data file separately and not include it as part of the main HTML or main