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To deal with the confusion over adding towers, we decided to have an "Options" panel that would appear beneath the data sets. We tried to have the user click on the data sets to access its options, but this was not immediately obvious. After the user testing, we realized we should have a small options icon next to each data set.
Additional pictures:
querying/statisticsIn the future, we hope to add a UI for querying the data and generating statistics. This will be an expansion of the "percent coverage" in the top-right corner.