Been running into consistent RTK signal interruptions when mapping downtown sites with our M350 RTK. Signal accuracy drops off beyond 35km from correction source, plus building interference causes float solutions or complete dropout to standalone mode. When RTK-float kicks in, accuracy degrades to tens of centimeters instead of the sub-cm we need.

Currently evaluating whether one GCP + PPK post-processing can solve the accuracy reduction from RTK signal loss. Has anyone compared RTK-fixed vs RTK-float vs PPK workflows on the same urban site? Wondering if the hybrid approach is worth the extra field time.

I use DroneDeploy or Pix4D Capture for planning and WebODM for processing - mostly work without GCP but starting to get more involved with ground truth as accuracy becomes critical. PPK with just 1 checkpoint beats setting 5-8 GCPs across the site.

PPK fills the gaps when real-time signals become unreliable due to building obstructions - processes the same GPS data post-flight to correct inaccuracies. Urban environments are exactly where PPK shines over RTK.

RTK has higher chance of malfunctioning because it cannot retain backup data to keep current flight in check - accountability simply isn't there. PPK is more reliable for urban work IMO.