If I take a set of GIS data (shapes, points, lines, etc) and convert the projection many times, will there be a loss in accuracy in the data?
The reason I ask is that I have a dataset from OSM which is in EPSG:3857 (WebMercator) and I want to convert to WGS84, then to the next projection, and so on. Ideally, I don't want to work on a copy of the original dataset. Instead, I want to update the data in-place.
However, this won't work if each time I re-project the data there is a loss in coordinate accuracy. After several conversions to whatever projection the data may be way off.
Specifically, I am using proj4 and PostGIS