The two maps shown below were produced in QGIS. I brought in the contour file of altitude that I used before and I brought in the subway line file which shows the B train tracks over New Utrecht Avenue Brooklyn. The vertical line that I mentioned in earlier posts crosses New Utrecht Avenue at 16th Avenue and 72nd Street. In one map, I brought in the elevations and the elevation does not vary that much from 10 or 11 meters. In the vertical error line, there is no variation as expected. A Google street view of the area shows nothing unusual.
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