[postgis-users] [EXTERNAL] Re: Replacement for Oracle's TRANSFORM_LAYER procedure?

[Bryan Hall]

Darafei,

Yes, I understand what needs to be done. I had thought by now someone would have created some Oracle -> PostGIS work-alike libraries for items like this. Since this does not seem to be the case, I will write a convenience procedure to do it then and share it back out when complete.

Bryan
From: postgis-users [mailto:postgis-users-bounces at lists.osgeo.org] On Behalf Of Darafei "Kom?pa" Praliaskouski
Sent: Thursday, May 10, 2018 03:14
To: PostGIS Users Discussion <postgis-users at lists.osgeo.org>
Subject: Re: [postgis-users] [EXTERNAL] Re: Replacement for Oracle's TRANSFORM_LAYER procedure?

A simplest nobrainer way:

create table new_table as (select * from old_table);
update new_table set geom = ST_Transform(geom, new_srid);
create index on new_table using gist(geom);

A more optimized one will be to inline the list all the columns in create table as:

create table new_table as (select column1, column2, ... , ST_Transform(geom, new_srid) as geom from old_table);
create index on new_table using gist(geom);

ср, 9 мая 2018 г. в 19:01, Bryan Hall <bryan.hall at chk.com<mailto:bryan.hall at chk.com>>:

Classification: DCL-Internal

Alexandre,

SDO_CS.TRANSFORM_LAYER clones the input table (or MV) to a new table, transforming the geometry column specified to the new SRID. For example:

SDO_CS.TRANSFORM_LAYER('LSE_DETAIL_ACTIVE','SHAPE','LDA_NAD27',4267);

This clones the LSE_DETAIL_ACTIVE table to one called LDA_NAD27, while transforming the SHAPE column to SRID 4267.

Bryan

From: postgis-users [mailto:postgis-users-bounces at lists.osgeo.org<mailto:postgis-users-bounces at lists.osgeo.org>] On Behalf Of Alexandre Neto
Sent: Wednesday, May 09, 2018 10:46
To: PostGIS Users Discussion <postgis-users at lists.osgeo.org<mailto:postgis-users at lists.osgeo.org>>
Subject: [EXTERNAL] Re: [postgis-users] Replacement for Oracle's TRANSFORM_LAYER procedure?

You may need to explain what SDO_CS.TRANSFORM does.

To transform a table's geometry SRID I use the following:

ALTER TABLE <table_name> ALTER COLUMN <geom_column_name> TYPE geometry(<geometry_type>, <target_CRS>) USING ST_Transform(<geom_column_name>, <target_CRS>);

Bryan Hall <bryan.hall at chk.com<mailto:bryan.hall at chk.com>> escreveu no dia quarta, 9/05/2018 às 16:02:

I’m starting to look at the stored procedures we will need to move to PostGIS from Oracle, and I don’t see anything like SDO_CS.TRANSFORM_LAYER in the manual for a built-in procedure. Yes of course there is ST_Transform, but that does it in place, or in-line. However, here we are making a new table in a different SRID and it would be rather nice not to hard-code the columns in the source table (or MV in this case), or copy the table as a whole and then do a clunky in-place update. Yes, I’d rather just add another geography column and make it a computed column – but stupid ESRI software has to read this data. 😊

Is there a good site to look for “convenience functions” like this for PostGIS? I’d rather not spend time “re-inventing the wheel” if I don’t have to.

Thanks, Bryan

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