diff --git a/README.rst b/README.rst
index b40c3f01..ad1ce85b 100644
--- a/README.rst
+++ b/README.rst
@@ -38,6 +38,18 @@ Features
 * Supports WCS versions 1.0.0, 2.0.0 and 2.1.0.
 * Richly featured styling engine for serving data visualisations via WMS and WMTS.
 
+Known CRS Limitations
+---------------------
+
+1. ODC datasets with WKT-format CRSs will not work with OWS - data from such datasets
+   will never be displayed. OWS currently only works with EPSG format CRSs.
+
+2. Datasets that straddle the anti-meridian or the north or south polar region will
+   cause issues with the legacy postgres driver.
+
+These are fundamental limitation of the way OWS works with the postgres ODC index driver.
+These limitations will be addressed in v1.9.0, but only for the new ODC postgis index driver.
+
 Community
 ---------
 
diff --git a/datacube_ows/sql/extent_views/create/011_create_new_space_view_raw.sql b/datacube_ows/sql/extent_views/create/011_create_new_space_view_raw.sql
index e0546d07..7b600ef0 100644
--- a/datacube_ows/sql/extent_views/create/011_create_new_space_view_raw.sql
+++ b/datacube_ows/sql/extent_views/create/011_create_new_space_view_raw.sql
@@ -28,6 +28,7 @@ eo3_ranges as
    from agdc.dataset where
       metadata_type_ref in (select id from metadata_lookup where name='eo3')
       and archived is null
+      and upper(substr(metadata #>> '{crs}', 1, 5)) = 'EPSG:'
   ),
 -- This is eo spatial (Uses ALOS-PALSAR over Africa as a sample product)
 eo_corners as
@@ -45,7 +46,7 @@ eo_corners as
         and archived is null
    and (metadata #>> '{grid_spatial, projection, valid_data}' is null
        or
-        substr(metadata #>> '{grid_spatial, projection, spatial_reference}', 1, 4) <> 'EPSG'
+        upper(substr(metadata #>> '{grid_spatial, projection, spatial_reference}', 1, 5)) <> 'EPSG:'
    )
 ),
 eo_geoms as
@@ -62,8 +63,8 @@ eo_geoms as
    from agdc.dataset where
         metadata_type_ref in (select id from metadata_lookup where name in ('eo','eo_s2_nrt','gqa_eo','eo_plus', 'boku'))
         and archived is null
-   and metadata #>> '{grid_spatial, projection, valid_data}' is not null
-   and substr(metadata #>> '{grid_spatial, projection, spatial_reference}', 1, 5) = 'EPSG:'
+        and metadata #>> '{grid_spatial, projection, valid_data}' is not null
+        and upper(substr(metadata #>> '{grid_spatial, projection, spatial_reference}', 1, 5)) = 'EPSG:'
 )
 select id,format('POLYGON(( %s %s, %s %s, %s %s, %s %s, %s %s))',
                  lon_begin, lat_begin, lon_end, lat_begin,  lon_end, lat_end,
@@ -97,4 +98,5 @@ select id,
       ) as spatial_extent
  from agdc.dataset where
         metadata_type_ref in (select id from metadata_lookup where name like 'eo3_%')
+        and upper(substr(metadata #>> '{grid_spatial, projection, spatial_reference}', 1, 5)) = 'EPSG:'
         and archived is null