River Cress and Grand Gedeh Counties

About Last Mile Health

Last Mile Health (LMH) works to provide high-quality healthcare to remote villages in Liberia through a community health worker (CHW) program. LMH needs maps of villages to help them do work in two counties of Liberia - Grand Gedeh and Rivercess. It will greatly aid in LMH's scale-up planning, CHW training, and routine program monitoring. It will also help them construct a sampling frame for a repeated cluster sample survey evaluation of their programs within the two counties.

OSM iD Editor Settings Brightness Adjustment

Often the default brightness settings in iD editor makes the background imagery difficult to see, but increasing the brightness will help. You can do this in the “Background settings” tab (Shortcut: b).

Classifying Dirt Roads

highway = *

All roads are classified as some type of highway. Roads are primarily classified based on their function. Tertiary roads connect villages and major streets in towns of some importance. Secondary and Primary roads connect medium and large cities. Motarways are restricted access highways. Sometimes it is difficult to immediately recognize what type of roads exist. An option is being able to re-classify some of the roads at a later point.

In this project, most of the roads you collect will be either a tertiary road, residential road, track, or path.

surface = *

In addition to using the highway tag, one can indicate the physical surface of the road with the surface tag:

Generically, a hard surface (asphalt, cobblestone, concrete…) is indicated with surface=paved and a soft one (ground, sand…) with surface=unpaved.

Residential Roads

highway = residential:

This tag is used for roads in or around residential areas except the major roads. Generally we would want you to classify a road this way if you suspect that it is used mostly by people that live on the road. Roads lined by residential buildings are good signs. If your unsure than use 'unclassified' value.

Unclassified Roads

highway = unclassified:

This classification is used for minor public roads typically at the lowest level of the interconnecting grid network. Unclassified roads have lower importance in the road network than tertiary roads, and are not residential streets or agricultural tracks. Unclassified roads are considered usable by motor cars.

Tip: if a minor roads is not a residential street or agricultural track, then mark is as an unclassified road.

Residential Areas

####landuse = residential:

An area of land dedicated to, or having predominantly residential houses or apartment buildings.

Validating Grids

OSM is constantly changing and no matter how filled out an area on the map is it is never done. The impression that validating a grid will mean that it will never be revisited leads many to feel intimidated by it. Anyone can validate! Just remember, do not validate your own work.

Validating a grid means that everything that needs to be done to meet the goals of the task you are working on. If the task is to map every type of feature possible and provide attributes this may be very complex and may require field verification but if the goal is to map basic features in a sparsly populated area this process is fairly straight forward.