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Monday, November 14, 2016

What is this vertical line?

  Hi Folks:

 In the past, I presented a lot of maps produced in ARCGIS.  One of the strange observations was  when a map was produced of altitude in Brooklyn, a strange line, 90 degrees to the horizontal appears from around the 62nd Street - New Utrecht Avenue station (D and N Trains) and stretches south to Coney Island.  Since altitude maps or data may be based on aerial observation, perhaps a seam in the photos cause such an image.   My source for altitude in Brooklyn in my previous maps was not ARCGIS.   Nevertheless, today I added an ARCGIS online basemap and behold, the same line appears.  In the past, I used Google Maps to pass over the area and I did not detect any sort of construction or ridge that would generate such an effect from a street level view.  What do you think it is?  See my map above and look for "What is this?"  in red.  You can see the vertical shadow.  Is this a map in code, an error caused by splicing the photos together, or something that exists?  Sorry for spelling errors in the map title.

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