1. A method comprising: causing a light detection and ranging (LIDAR) device associated with an autonomous vehicle to scan through a scanning zone while emitting light pulses; determining a three-dimensional (3-D) point map of the scanning zone based on time delays between emitting the light pulses and receiving corresponding returning reflected signals and based on orientations of the LIDAR device while emitting the light pulses; identifying a region of the scanning zone for spectral analysis based on the 3-D point map including a particular reflective feature that resembles a type of non-solid object; imaging, with a hyperspectral sensor associated with the autonomous vehicle, the identified region of the scanning zone so as to generate spectral information characterizing a spectral distribution of radiation received from the particular reflective feature; correlating the particular reflective feature with a non-solid material based on the spectral distribution of radiation received from the particular reflective feature including one or more spectral characteristics of the non-solid material; in response to the correlating, determining that the particular reflective feature corresponds to a non-solid object; combining information from the LIDAR device and the hyperspectral sensor, wherein the hyperspectral sensor is separate from the LIDAR device, and wherein the combined information indicates whether reflective features in the 3-D point map correspond to solid objects or non-solid objects; analyzing the combined information to identify obstacles relative to a current path of the autonomous vehicle; determining a modified path of the autonomous vehicle that avoids the identified obstacles; and controlling the autonomous vehicle to navigate along the modified path.