PlanWise applies algorithms and geospatial optimisation techniques to existing data on population, road networks and health facilities, so health care planners can better understand the unmet health needs of their constituents and better locate future health facilities.
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Complex Geography Shapefiles Make for Confusing Coverage Outputs #527
When doing planning on a regional level, the shape of the region is treated as a hard stop. In reality, this isn't how people access to care, they may live in one region and travel across.
Also, when visualizing the coverage of a facility - the shape of the region can result in some confusing outputs. See below, where a carve-out region inside a region is excluded, and where the distance between a facility and the selected region shows as no coverage. It took me a second to realize what is going on, but it seems to be skipping over the space outside the region, then picking it back up inside the region. Pretty confusing.
steesdale
commented
5 years ago 
When doing planning on a regional level, the shape of the region is treated as a hard stop. In reality, this isn't how people access to care, they may live in one region and travel across.
Also, when visualizing the coverage of a facility - the shape of the region can result in some confusing outputs. See below, where a carve-out region inside a region is excluded, and where the distance between a facility and the selected region shows as no coverage. It took me a second to realize what is going on, but it seems to be skipping over the space outside the region, then picking it back up inside the region. Pretty confusing.