Fig. 3From: Radio map construction based on BERT for fingerprint-based indoor positioning systemAn example of RSS reading collection for mobile devices in different directions. a \(\theta\)=\(0^{\circ }\) b \(\theta\)=\(90^{\circ }\) c \(\theta\)=\(180^{\circ }\) d \(\theta\)=\(270^{\circ }\)Back to article page