TY JOUR TI Research of the Accuracy of Two‑Stage Aerial Photographing with Determination of Coordinates of Photography Centers for Creating Topographic Plans from Unmounted Survey Materials KW two-stage aerial photographing KW unmanned aerial vehicle KW DZ materials KW calibration JO Spatial Data: Science, Research and Technology AU Bykov, L.V. AU Pushchak, O.N. AU Morozova, A.A. PY 2025 IS 16 PB MIIGAiK