You don't need to use ST_GeomFromText if it's already a geometry, if you need to set the SRID to 4326 then use ST_SetSRID(geom, 4326), but I don't think you need that either.
Couple of other things I see as issues with this query 1) ST_Buffer is missing an amount to buffer by, if your coordinates are in 4326 then your units would be in degrees so should be changed to something like ST_Buffer(geom, 0.00001) 2) ST_Buffer(. FROM ch04.newpoint) should not be like that. I'm assuming your ch04.newpoint is the table of the points you want to intersect with So should be more like: FROM ch04.dumprastval AS r INNER JOIN ch04.newpoint AS p ON ST_Intersects(r.rast, p.geom) 3) Gathering from the name ch04.dumprastval, it sounds like you may have already run ST_DumpAsPolygons to convert your raster to a geometry? In which case you shouldn't have a rast column at all. 4) While not required, it helps to understand what is going on if you prefix the columns with the table each is coming from. For example in #2 I was guessing. If you tables are kinda long, it helps to alias them such as ch04.newpoint AS p Once you have a revised query it helps to post the error you are having since it's hard to test your query without data. Hope that helps, Regina From: postgis-users [mailto:postgis-users-boun...@lists.osgeo.org] On Behalf Of Amy O'Keefe Sent: Friday, November 6, 2020 7:50 AM To: 'PostGIS Users Discussion' <postgis-users@lists.osgeo.org> Subject: [postgis-users] raster intersecting geometry Hi all, could anyone help me with the below query? I'm trying to find the geometries from a table (ch04.newpoint) which intersect the raster (ch04.dumprastval). However I can't seem to get it to work! Thanks. SELECT CAST((gval).val As integer) AS val, ST_Union((gval).geom) As geom FROM ( SELECT ST_Intersection( ST_Clip(rast,ST_Envelope(buf.geom)), 1, buf.geom ) As gval FROM ch04.dumprastval INNER JOIN ( SELECT ST_Buffer( ST_GeomFromText(geom,4326) FROM ch04.newpoint ON ST_Intersects(rast,geom) ) As foo GROUP BY (gval).val ORDER BY (gval).val; This email and any attachments are confidential and intended solely for the use of the addressee and may contain information which is covered by legal, professional or other privilege. If you have received this email in error please notify the system manager at postmas...@ulster.ac.uk <mailto:postmas...@ulster.ac.uk> and delete this email immediately. Any views or opinions expressed are solely those of the author and do not necessarily represent those of Ulster University. The University's computer systems may be monitored and communications carried out on them may be recorded to secure the effective operation of the system and for other lawful purposes. Ulster University does not guarantee that this email or any attachments are free from viruses or 100% secure. Unless expressly stated in the body of a separate attachment, the text of email is not intended to form a binding contract. Correspondence to and from the University may be subject to requests for disclosure by 3rd parties under relevant legislation. The Ulster University was founded by Royal Charter in 1984 and is registered with company number RC000726 and VAT registered number GB672390524.The primary contact address for Ulster University in Northern Ireland is Cromore Road, Coleraine, Co. Londonderry BT52 1SA
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