docs: add explanation for default CRS

docs/api/sql/Raster-operators.md

@@ -1359,6 +1359,8 @@ Introduction: Returns a raster that is clipped by the given geometry.
 
 If `crop` is not specified then it will default to `true`, meaning it will make the resulting raster shrink to the geometry's extent and if `noDataValue` is not specified then the resulting raster will have the minimum possible value for the band pixel data type.
 
+!!!Note
+    Since `v1.5.1`, if the coordinate reference system (CRS) of the input `geom` geometry differs from that of the `raster`, then `geom` will be transformed to match the CRS of the `raster`. If the `raster` or `geom` doesn't have a CRS then it will default to `4326/WGS84`.
 
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@@ -1739,7 +1741,7 @@ of the rectangular region. The new values to be assigned to the pixels in this r
 to this function.
 
 !!!Note
-    Since `v1.5.1`, if the coordinate reference system (CRS) of the input `geom` geometry differs from that of the `raster`, then `geom` will be transformed to match the CRS of the `raster`.
+    Since `v1.5.1`, if the coordinate reference system (CRS) of the input `geom` geometry differs from that of the `raster`, then `geom` will be transformed to match the CRS of the `raster`. If the `raster` or `geom` doesn't have a CRS then it will default to `4326/WGS84`.
 
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@@ -1844,7 +1846,7 @@ Output:
 Introduction: Returns the value at the given point in the raster. If no band number is specified it defaults to 1.
 
 !!!Note
-    Since `v1.5.1`, if the coordinate reference system (CRS) of the input `point` geometry differs from that of the `raster`, then `point` will be transformed to match the CRS of the `raster`.
+    Since `v1.5.1`, if the coordinate reference system (CRS) of the input `point` geometry differs from that of the `raster`, then `point` will be transformed to match the CRS of the `raster`. If the `raster` or `point` doesn't have a CRS then it will default to `4326/WGS84`.
 
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@@ -1884,7 +1886,7 @@ RS_Values is similar to RS_Value but operates on an array of points or grid coor
 RS_Values can be significantly faster since a raster only has to be loaded once for several points.
 
 !!!Note
-    Since `v1.5.1`, if the coordinate reference system (CRS) of the input `points` geometries differs from that of the `raster`, then `points` will be transformed to match the CRS of the `raster`.
+    Since `v1.5.1`, if the coordinate reference system (CRS) of the input `points` geometries differs from that of the `raster`, then `points` will be transformed to match the CRS of the `raster`. If the `raster` or `points` doesn't have a CRS then it will default to `4326/WGS84`.
 
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