GCS_WGS_84 a geographic coordinate system with that datum, its coordinates are in decimal degrees WGS_84 per se isn't a coordinate system, it is a datum, which is why you can have What am I doing wrong or do not understand about this projection problem, and what can I do to address it? The fact that all three of the layers (including the map) I’m currently working with are in WGS_1984 would seem to indicate that there should be no alignment problem. There are some transformation Datums for Sri Lanka, (1) Kandawala_To_WGS_1984 and (2) SLD_To_WGS_1984_1 both suitable for Sri Lanka – onshore, and I have tried to do various transformations to try to improve the alignment, but nothing seems to work. I’m obviously doing something wrong or remain a little confused about how to address projection issues. However, it does not align with the ArcGIS Pro World Imagery. However, I have one shapefile (symbolized in red) that is in WGS_1984, but with no projected coordinate system identified, so I’m assuming one is not needed for it in this case. It is perfectly aligned with the ArcGIS Pro World Imagery layer, based on my ground knowledge of the area. A typical example is the shapefile in yellow. My desire is to work in a WGS_1984 environment when possible and my project map is in WGS_1984 (see attachment). In my research, most of the shapefiles that I bring into the map from outside sources, mainly government sources (but also some institutional sources), are conveniently in GCS_WGS_1984, and usually do not have any unique projection needs associated with them that are suggested by their metadata. Just finished David Smith's textbook, Understanding GIS Pro.
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