This paper presents two origin-destination flow estimation models using sampled GPS positions of probe vehicles and link flow counts. The first model. named as SPP model (scaled probe OD as prior OD). uses scaled probe vehicle OD matrix as prior OD matrix and applies conventional generalized least squares (GLS) framework to conduct OD correction using link counts; the second model. https://fitnessgravesyardes.shop/product-category/hand-pulse-grip/