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Are USGS elevation maps stretched?

crushnik

crushnik

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537
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us-missouri
I remember the process for making flight simulator terrain mesh from USGS DEMs, having to reproject them to WGS84. But I noticed when working with the geotiff in QGIS that a 38-degree north map was a perfect square (10,812x10,812). On the National Map viewer download page the tile I am working with is clearly a tall rectangle, not a perfect square. Do I need to reproject the stock data before it is accurate?
 
As far as I know, FSET and the USGS viewer use a Mercator projection, but QGIS uses a Plate Carree display by default.
Therefore, the DEM tile in the true-angle Mercator projection is stretched in the lat direction, while the tile in the plate-carree representation is perfectly square.

Short:
Sounds good like it currently is!
 
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