Hey Ben...
Long time!
In the absence of a more elegant approach...

You could try the FDW query going via WKT rather than WKB - so deconstruct then 
Minor overhead for a one-off transfer, perhaps more of an issue for a working 
I use both fdw & OGR virtual data source to access data from Specify (MySQL) in 
QGIS. Both work fine. Different sorts of issues with each. So fdw is not just 
used for data transfers :-)

      From: Ben Madin <b...@ausvet.com.au>
 To: PostGIS Users Discussion <postgis-users@lists.osgeo.org> 
 Sent: Saturday, October 15, 2016 1:03 PM
 Subject: [postgis-users] Problem extracting SQL Server Geometry (or, what is 
the 0x character?)
G'day all,
I hope a simple case of something I've missed, but we are trying to extract 
data from a SQL Server database into PostGIS use tds_fdw... the data in SQL 
Server appears to be in WKB - but when when connect to this field we have a 
precursor 0x. I can't find any references to anyone else suffering this 
problem, but that could be because I'm trying a lazy approach to automate 
retrieval of hundreds of tables using the FDW (that's what it is for, right?)
I'm left with a sense that it is an encoding error between the two systems? 
I've tried making the fdw column text instead of geometry, but I can't get rid 
of the 0x, and no amount of trying to cajole the text to any other form makes 
it any happier. 
To complicate it, for testing I'm going from SQL Server 2014 (running in 
Windows 8.1 in a VM) to PostgreSQL 9.4 on a Mac (El Capitan) using tds_fdw 
compiled on the same mac. POSTGIS="2.2.2 r14797" GEOS="3.5.0-CAPI-1.9.0 r0" 
PROJ="Rel. 4.9.2, 08 September 2015" GDAL="GDAL 2.1.1, released 2016/07/07" 
LIBXML="2.7.8" LIBJSON="0.12.1" RASTER
Any ideas gratefully received? 

m : +61 448 887 220
e : b...@ausvet.com.au
10 High Street, FremantleWestern Australia
on the web: www.ausvet.com.au

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