Widely usage of LPWAN networks allows us to think about the further development of this technology, which develops networks to work not only with the star topology but also with a mesh topology. With such development, a procedure should be provided for determining the coordinates of nodes in the network. In this article, we propose a method for constructing a map of sensor nodes in the wireless mesh network. In particular, we analyzed rangefinder methods based on the received signal strength or the signal propagation duration to calculate the distances between nodes. With determined distances, a method is considered for constructing a three-dimensional model of each network fragment, then spatial transformations are carried out for the subsequent construction of a three-dimensional model of the whole network.