I am using some polygons and rasters whose initial extents cover all of Canada or all of North America. I am interested in a small area in Ontario that is in UTM zone 18. I would like to use the UTM 18 projection for this project. If I convert all of my layers into WGS84 UTM 18 using ArcGIS, obviously the parts of the layers outside of the UTM 18 zone will be horribly distorted. I will be cropping the layers after to only my zone of interest once they are all in the same projection. But will the part of the map that is actually in UTM zone 18 be distorted as a result of the reprojection of the entire span of Canada, or will this part be fine?
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