Inaccurate data display/filtering (DUpAC_EFF)

[atomtay]

Since switching to the production MapService, some data seems to be styled incorrectly on the choropleths. The legends/scales themselves have not changed. This is most immediately evident with the Effective Maximum Dwelling Units per Acre display, though it may be true with others.

In March 2020, we had this as a starting point dwelling units/acre map:

On December 11, I took this screenshot of the DUpAC_EFF layer with an older feature service. It followed our original dwelling units/acre map from March pretty closely; hard to tell if they're an exact match, and some variation would make sense as we edited and refined data:

Today (December 22) I took this screenshot for the upcoming calendar release. It is the same map with the current production map service displayed (simplified, due to zoom level):

The most obvious change is how much gray ("Data unavailable") is on the most recent map that was not present before. A couple other differences, though, include:

• Increased density in Dedham
• Decreased density in Somervile and increased density in Medford (these might be two separate matters, but since they neighbor each other I wonder if the changes are linked)

[atomtay]

Potentially related to #44

[atomtay]

This seems to particularly be an issue with the simplified layer. Since that is the first layer that loads (and there is some lag time while swapping layers---not sure how much) that created the appearance that it carried over to the "full", non-simplified layer as well.

[atomtay]

This is temporarily resolved by only referencing the "full zoning" layer (not toggling between the full and simplified layers)