I'm looking into the EMAG2 dataset (http://www.geomag.org/models/emag2.html) which claims to be a 2 arc minute resolution. I want to create square pixel tiles where pixels will be of an exact distance like 100m or 100Km. But how can this be done if the grid cells may be of different areas on difference places in the world?
To reiterate, if a dataset is 2 arc minute resolution, does that mean the grid cells change aspect ratio and area size at different coordinates in the world?
I'd prefer to use the GDAL/OGR toolset.
Edited according to clarification: How do you convert an arc-based (e.g. 2 arc-minute) resolution grid dataset to a square aspect-ratio "pixel like" (e.g. 100Km by 100Km pixels) resolution raster image dataset assuming that arc-based resolution grids have grid cells that have different area sizes at different coordinates? (this assumption may not be true, please tell me if so.)