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In the map below, an aerial photograph was brought in. Elevation is hinted by the slight change of colors.
In the map above, a hydrology experiment was done in which the street layer was used as the basis of the stream layer. An elevation fle was brought in and a map was produced showing critical stream areas (blue X's) at low points along the streets. Done using GRASS 6.4.1 Hydrology program.
In the map below, streams, indicated by red dots, were used as the basis of the hydrology study and the results shown in light green, are areas of flooding, according to this experiment.
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