A geographic information system (GIS) may include a display, a GIS database, and a processor the processor may cooperate with the display and the GIS database to display a three-dimensional (3D) geospatial image including a plurality of spaced-apart reference markers therein. The reference markers may have different visual characteristics indicative of different relative positions within the 3D geospatial image. The processor may also associate with each reference marker selectively displayable position data. The reference markers may have different sizes and/or colors, for example.
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