PostGIS support

Question

PostGIS support

sommergis opened this issue 2 years ago · comments

I learned about this project from Scaling Postgres#254 - very interesting work!

I tried to replace the test data with my own data and encountered an issue. I'm using PostGIS (geometry and raster) data, which basically worked in the REST API, but unfortunately was encoded binary in the output:

Maybe this is how pgec handles all non-simple UDTs.

It would be great to add ST_AsBinary(), ST_AsText() or ST_AsGEOJSON() for the output PostGIS vector geometries of pgec (REST, Memcached and Redis API) and maybe ST_AsBinary() for PostGIS raster objects.

I'm happy to contribute if you point me to the code - although I don't have any knowledge in Erlang.

Best regards,
Johannes

Peter Morgan · Answer 1 · Thu Mar 02 2023 16:02:09 GMT+0800 (China Standard Time)

Hi Johannes,

Thanks! Yes, that looks like the default handling for an "unknown" type. The "value" is the encoded type (which is showing as binary). I'll take a look at what is required to support postgis types - do you have a schema (and small sample data) that you could share to use as an example?

Thanks!
Peter.

johannes · Answer 2 · Thu Mar 02 2023 18:01:53 GMT+0800 (China Standard Time)

Hi Peter,

thank you for looking into this!
I attached two open data samples in PostgreSQL SQL format:

PostGIS vector geometry from Openstreetmap
PostGIS raster clipping from Sentinel 2 data

010_init_postgis_extensions.sql.gz
011_osm_rivers_sample.sql.gz
012_S2_T32ULU_20190823T103029.sql.gz

Best regards,
Johannes

Peter Morgan · Answer 3 · Fri Mar 03 2023 01:50:14 GMT+0800 (China Standard Time)

Thanks for the data!

Decoding the OSM rivers sample with output from pgec encoding into JSON (some details from the WKB are little rough: endian, format/etc are still present right now).

Does this look useful? If so, I need to tidy a couple of things up, but could push onto develop sooner than later.

Raster - I need to understand a bit more.

➜  pgec git:(develop) ✗ curl -s http://localhost:8080/pub/osm_rivers_sample/1 | jq
{
  "country": "TZA",
  "geom": {
    "endian": "little",
    "format": "extended",
    "m": false,
    "points": [
      {
        "endian": "little",
        "format": "standard",
        "points": [
          {
            "type": "point",
            "x": 30.78103150000379,
            "y": -2.3894540996269598
          },
          {
            "type": "point",
            "x": 30.780984200160788,
            "y": -2.3889098002470632
          },
         ...lots more points...
          {
            "type": "point",
            "x": 30.86863800024355,
            "y": -2.1394782001587487
          }
        ],
        "type": "line_string"
      }
    ],
    "srid": 4326,
    "type": "multi_line_string",
    "z": false
  },
  "name": "Akagera",
  "ogc_fid": 1,
  "osm_id": "25470351",
  "type": "river"
}

johannes · Answer 4 · Fri Mar 03 2023 15:07:10 GMT+0800 (China Standard Time)

Maybe I don't understand the principles of postgres logical streaming decoding but it seems to me that you'll have to decode the binary with own written code. Wouldn't it be possible to access regular PostgreSQL/PostGIS functions?

The regular approach for decoding internal binary format for PostGIS vector geometry to Text representation is with ST_AsText(geometry). I could also imagine WKB as on option (ST_AsBinary function)

For the PostGIS raster type I don't think its feasible to convert this to text representation in a REST API someone could use afterwards. But I think WKB ; WKB Format description would be a good approch.

Both WKB formats are much better than the internal PostgreSQL binary format, because they are known in the GIS ecosystem and for their tools.

Peter Morgan · Answer 5 · Fri Mar 03 2023 16:36:44 GMT+0800 (China Standard Time)

Thanks for all the links, they're very useful :)

Would the following work? The "geom" attribute is the WKB provided by the replication process.

➜  pgec git:(develop) ✗ curl -s http://localhost:8080/pub/osm_rivers_sample/1 | jq
{
  "country": "TZA",
  "geom": 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  "name": "Akagera",
  "ogc_fid": 1,
  "osm_id": "25470351",
  "type": "river"
}

johannes · Answer 6 · Fri Mar 03 2023 16:59:23 GMT+0800 (China Standard Time)

Great! I appreciate your quick feedback! Looks like WKB for geometry - thank you! This could also be the option for the raster binary.
Would the WKB also be part of the Redis & Memcached API?

Peter Morgan · Answer 7 · Fri Mar 03 2023 17:11:18 GMT+0800 (China Standard Time)

Awesome! :) Yes, that will be available on all API.

Redis version is below, but memcached will be the same as the REST above.

I'll take a look at the raster short(ish)ly.

redis-cli hgetall pub.osm_rivers_sample.1

"type"
"river"
"osm_id"
"25470351"
"ogc_fid"
"1"
"name"
"Akagera"
"geom"
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"country"
"TZA"

johannes · Answer 8 · Fri Mar 03 2023 21:37:38 GMT+0800 (China Standard Time)

Very good! As soon this is pushed to the develop branch I am to happy to test it!

Peter Morgan · Answer 9 · Sat Mar 04 2023 00:26:53 GMT+0800 (China Standard Time)

PostGIS geometry and raster support are now in develop :)

Please use the develop branch for the following. The compose has been updated so that POSTGRES_IMAGE can be overridden to use PostGIS, PGEC_VERSION must also be overridden to pull the develop container.

cd pgec
git checkout develop
git pull

# stop old version...
docker compose --profile all down --remove-orphans --volumes

# copy in your startup scripts if not already there...
cp ~/[0-9][0-9][0-9]_*.sql example/initdb.d/
ls example/initdb.d/[0-9][0-9][0-9]_*.sql
example/initdb.d/010_init_postgis_extensions.sql  example/initdb.d/011_osm_rivers_sample.sql  example/initdb.d/012_S2_T32ULU_20190823T103029.sql

# startup with postgis and pgec with develop
POSTGRES_IMAGE=postgis/postgis PGEC_VERSION=develop docker compose --profile all up --detach

River sample should be the same as discussed above.

Raster:

curl -s http://localhost:8080/pub/raster_sample/1 | jq

{
  "raster": "0100000C00000000000000244000000000000024C0CAC342ADB65518411CEBE286034B544100000000000000000000000000000000787F0000440192010600000501050105010501050105011E011...",
  "rid": 1
}

Some of the Redis commands have been updated on this branch too (hset, del, hget, hgetall, hlen, hkeys, psubscribe/etc), so there may be some rough edges there, but will be final/released soon.

johannes · Answer 10 · Sat Mar 04 2023 03:04:44 GMT+0800 (China Standard Time)

Great, I can confirm it works with the develop branch! Thank you!