[prev in list] [next in list] [prev in thread] [next in thread] 

List:       postgis-users
Subject:    [postgis-users] PostGIS EWKB specification
From:       Mert Erkan Elalmış <mert.erkan.elalmis () gmail ! com>
Date:       2012-01-31 12:10:21
Message-ID: CALg-Fxh+GDGZExr6ARVmhMGeOxP8uf30BknEoCmw0fZyakVp_A () mail ! gmail ! com
[Download RAW message or body]

[Attachment #2 (multipart/alternative)]


Hello,

I am trying to write down an interface definition document between two
systems. One of the systems is using PostGIS for GIS related functions and
generates geometry information in EWKB format. I am looking for a EWKB
specif'cation document, which defines the format of EWKB. I can only find
following information
http://www.postgis.org/documentation/manual-svn/using_postgis_dbmanagement.html#EWKB_EWKTor
http://www.postgis.org/documentation/manual-1.5/ch04.html#EWKB_EWKT , which
seems outdated to me.
OGC Simple Feature Access version 1.2.0 dated : 2006-10-05 and version
1.2.1 dated : 2011-05-28 supports Z, M and ZM, and many geometry types had
been included, however OGC still does not support SRID as an attribute to
geometry. Furthermore EWKB and WKB 1.2.0 interprets Z, M and ZM geometries
differently. In WKB 1.2.0 PointZ interger code is 1001 whereas in EWKB it
is 0x800000001.

In short
Is there a document that defines to EWKB format as similar to OGC document?
Is there any plans to redefine EWKB as an extension to WKB 1.2.0 in maybe
PostGIS 2.0?

Thanks
Mert Erkan Elalmis

[Attachment #5 (text/html)]

<div>Hello,<br> <br>I am trying to write down an interface definition document \
between two systems. One of the systems is using PostGIS for GIS related functions \
and generates geometry information in EWKB format. I am looking for a EWKB \
specif&#39;cation document, which defines the format of EWKB. I can only find \
following information <br> <a \
href="http://www.postgis.org/documentation/manual-svn/using_postgis_dbmanagement.html# \
EWKB_EWKT">http://www.postgis.org/documentation/manual-svn/using_postgis_dbmanagement.html#EWKB_EWKT</a> \
or <br><a href="http://www.postgis.org/documentation/manual-1.5/ch04.html#EWKB_EWKT">http://www.postgis.org/documentation/manual-1.5/ch04.html#EWKB_EWKT</a> \
, which seems outdated to me. <br> OGC Simple Feature Access version 1.2.0 dated : \
2006-10-05 and version 1.2.1 dated : 2011-05-28 supports Z, M and ZM, and many \
geometry types had been included, however OGC still does not support SRID as an \
attribute to geometry. Furthermore EWKB and WKB 1.2.0 interprets Z, M and ZM \
geometries differently. In WKB 1.2.0 PointZ interger code is 1001 whereas in EWKB it \
is 0x800000001.<br>  <br>In short<br>Is there a document that defines to EWKB format \
as similar to OGC document?<br>Is there any plans to redefine EWKB as an extension to \
WKB 1.2.0 in maybe PostGIS 2.0?<br></div> <div> </div>
<div>Thanks</div>
<div>Mert Erkan Elalmis</div>



_______________________________________________
postgis-users mailing list
postgis-users@postgis.refractions.net
http://postgis.refractions.net/mailman/listinfo/postgis-users


[prev in list] [next in list] [prev in thread] [next in thread]