I imported the shapefiles from a government source but it looks like the land masses arent't aligned properly even though the crs on all layers are the same.
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The layer I downloaded had an EPSG of 4326, which is a geographic CRS. Right clicking and setting a different CRS is not enough - this way you are just confusing QGIS, telling it that 1 degree is 1 m.
You should reproject your layers first.
- Import your layer anew, making sure that QGIS knows that they have an a geographic CRS (usually it will automatically recognize the EPSG of a shapefile).
- Right click on the layer --> Export --> Save Features as.. and save the layer, giving it a new CRS (in your case 26919):
QGIS is going to ask you for the transformation algorithm you want to use; in any case, it will be accurate down to 1-4 m.
Now that you have a new layer that has been reprojected, you can do your analysis and mapping. Don't forget to choose the right CRS for your overall project from the bottom right button.
miln40
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See here for background and explanation of "changing" CRS vs. reprojecting: https://gis.stackexchange.com/a/383437/88814 – Babel Jan 20 '21 at 21:10
CRS,set layer CRS– JGH Aug 19 '20 at 18:22I used 24m, 24n, 25c, and 25d
– Lisa Wang Aug 19 '20 at 19:29<gmd:referenceSystemInfo>) or to a lesser extent from the crypticprjfile (though the epsg code is not stated there) – JGH Aug 19 '20 at 19:58