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AT 309 - Week 11 - Projections
To see how distance changes with map projection, I measured the distance between Los Angeles and New York on a standard topographic map (about 2,440 miles) and then on a Mercator map (about 3,127 miles). The difference showed how flattening the Earth’s curved surface causes distortion. I also learned about on-the-fly projection in ArcGIS Pro, where the software automatically assigns a coordinate system when data is loaded. By exploring systems like NAD83 (2011) Contiguous USA and GCS WGS84, I saw how the map’s appearance changed even though the underlying data did not—ArcGIS Pro was simply reprojecting the layers temporarily to match the selected coordinate system.
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