Professional R&D and excellent quality plasticizer chemicals

GDOP (geometric dilution of precision) or PDOP (position dilution of precision) describes the error caused by the relative position of the GPS satellites. Basically, the more signals a GPS receiver can “see” (spread apart versus close together), the more precise it can be.

Within the position information of the UNI-Connect’s survey tool, you find the PDOP, HDOP and VDOP values. The different DOP values have various functions in satellite geometry. Position DOP (PDOP) This value describes how many satellites are spread evenly throughout the sky.

Dilution of precision ( DOP ), or geometric dilution of precision ( GDOP ), is a term used in satellite navigation and geomatics engineering to specify the error propagation as a mathematical effect of navigation satellite geometry on positional measurement precision. Understanding the geometric dilution of precision (GDOP) with a simple example.

GPS receivers report several components of DOP, including Horizontal Dilution of Precision (HDOP) and Vertical Dilution of Precision (VDOP). The combination of these two components of the three-dimensional position is called PDOP - position dilution of precision.

HDOP values are typically between one and two. VDOP values are larger than the HDOP values indicating that vertical position errors are larger than horizontal errors. We suffer this effect because all of the satellites from which we obtain signals are above the receiver.