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WGS 84 / Pseudo-Mercator is not good for measuring distances, because the projection is heavily distorted when moving away from the equator. It could be discussed if the units should be called "Pseudo-meters".

This especially happens the further north or south you're going. 1 meter in reality is approximately 1/cos(lat) pseudo-meters  .

You can calculate the approximate pixel size for your raster image:

30m / cos(69.53°) = 85.78 pseudo-meters

Compare this with your gdalinfo output.

CC BY-SA 3.0, Author: Stefan Kühn

gdalwarp is doing the right thing: preserving total resolution of your image by changing the pixel-size.

WGS 84 / Pseudo-Mercator projection is heavily distorted when moving away from the equator. Thus, it could be discussed if the units should be called "Pseudo-meters". One meter in reality is approximately 1/cos(lat) pseudo-meters.

You can calculate the approximate pixel size for your raster image:

30m / cos(69.53°) = 85.78 pseudo-meters

Compare this with your gdalinfo output.

CC BY-SA 3.0, Author: Stefan Kühn

WGS 84 / Pseudo-Mercator is not good for measuring distances, because the projection is heavily distorted when moving away from the equator. It could be discussed if the units should be called "Pseudo-meters".

This especially happens the further north or south you're going. 1 meter in reality is approximately 1/cos(lat) pseudo-meters .

You can calculate the approximate pixel size for your raster image:

30/cos(69.53) = 85.78

Compare this with your gdalinfo output.

CC BY-SA 3.0, Author: Stefan Kühn

WGS 84 / Pseudo-Mercator is not good for measuring distances, because the projection is heavily distorted when moving away from the equator. It could be discussed if the units should be called "Pseudo-meters".

This especially happens the further north or south you're going. 1 meter in reality is approximately 1/cos(lat) pseudo-meters .

You can calculate the approximate pixel size for your raster image:

30m / cos(69.53°) = 85.78 pseudo-meters

Compare this with your gdalinfo output.

CC BY-SA 3.0, Author: Stefan Kühn

WGS 84 / Pseudo-Mercator is not good for measuring distances, because the projection is heavily distorted when moving away from the equator. It could be discussed if the units should be called "Pseudo-meters".

This especially happens the further north or south you're going. 1 meter in reality is 1/cos(lat) pseudo-meters .

You can calculate the approximate pixel size for your raster image:

30/cos(69.53) = 85.78

Compare this with your gdalinfo output.

© 2005-2015 Matthew T. Perry

WGS 84 / Pseudo-Mercator is not good for measuring distances, because the projection is heavily distorted when moving away from the equator. It could be discussed if the units should be called "Pseudo-meters".

This especially happens the further north or south you're going. 1 meter in reality is approximately 1/cos(lat) pseudo-meters .

You can calculate the approximate pixel size for your raster image:

30/cos(69.53) = 85.78

Compare this with your gdalinfo output.

CC BY-SA 3.0, Author: Stefan Kühn