I’ve been working through the Elementary Introduction to the Wolfram Langauge book on the Wolfram website. Chapter 24, on “More Forms of Visualization” has an example of using ListPlot3D with `
` to yield a 3-dimensional view of Mount Everest.
I wanted to try that code on examples that were more familiar to me. But it seems that the QuantityArray that is generated reverses the north-south axis. I tried it on a several locations with similar results. See attached notebook for a couple of them. As a visual comparison, I referred to https://mapcarta.com for the same locations.
I can fix it by using ScalingFunctions -> "Reverse" as an option to ListPlot3D. But I shouldn’t have to. I guess the elevation data is stored in the array in a reversed order.
Indeed, a reversal of the first level of the data is needed in ListPlot3D. The documentation page of GeoElevationData uses the construction ListPlot3D[Reversed[data], ...] in its examples. This is a question of conventions used, and we always have to take into consideration which convention is being used by each function. Take for instance this data:
data = GeoElevationData["World"];
and compare the results of these two:
ArrayPlot[data]
ReliefPlot[data]
We see that different functions interpret the data differently, and we may need to reverse the data (with Reverse, or the option DataReversed, or the ScalingFunctions value “Reverse” as you did).
