[postgis-users] geometry(bytea)

Sat Jul 21 06:45:34 PDT 2007

Hello Murali!

I am doing exactly the same at this moment! In our case, the shape files
are zip files in the MS SQL database (do these blobs come from
MapObjects? then you are probably in the same situation.)

/*The Byte is probably a ZIP, not a shape..*/

What we do:
- Extract the blobs with a php-script -> store them as *ZIP*
- *Unzip* with the php_zip_lib (or something like that, I am not behind
the development machine right now) into a /temp directory/
- start a shell from the php-script that activates ogr2ogr -> ESRI shape
to PostGIS for the shape file in the temp directory into a temporary
table in PostGIS
- Copy the temp table content in PostGIS to a production table with an
INSERT statement
- loop this sequence

Our proces is 80% under control, we are now generating the insert into
production (with a little help here on the PostGIS forums, thanks again
Kevin)

Let me know if you want to know more. ....

Kind regards,
Milo van der Linden
http://www.3dsite.nl

Murali Maddali schreef:
> This is a ESRI shape file record, untranslated. Can you suggest me how to
> translate this. 
>
> I am reading the blob from SQL Server 2000 using C# which return a Byte[]
> and convert this Byte[] to bytea and pass this to Npgsql command object as a
> parameter. 
>
> Thank you,
> Murali K. Maddali
> 256-705-5191
> murali.maddali at uai.com
>
> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net
> [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Paul
> Ramsey
> Sent: Friday, July 20, 2007 6:10 PM
> To: PostGIS Users Discussion
> Subject: Re: [postgis-users] geometry(bytea)
>
> What is the format of your bytea?  If it's the ESRI shape file record,
> untranslated, you're out of luck.  If it's a WKB byte array, then use
> GeomFromWKB.
>
> P
>
> On 20-Jul-07, at 8:17 AM, Murali Maddali wrote:
>
>   
>> Hello All,
>>
>> Can any one tell what I am doing wrong with the following select.
>>
>> select geometry('\\005\\000\\000\\000\\010\\247\\033\\113\\056\\263\
>> \053\\101\\213\\236\\223\\165\\164\\062\\046\\101\\006\\377\\131\
>> \025\\172\\266\\053\\101\\350\\300\\323\\152\\241\\067\\046\\101\
>> \001\\000\\000\\000\\006\\000\\000\\000\\000\\000\\000\\000\\010\
>> \247\\033\\113\\056\\263\\053\\101\\376\\053\\330\\300\\234\\067\
>> \046\\101\\205\\364\\147\\256\\134\\266\\053\\101\\350\\300\\323\
>> \152\\241\\067\\046\\101\\006\\377\\131\\025\\172\\266\\053\\101\
>> \230\\025\\330\\025\\171\\062\\046\\101\\034\\227\\351\\330\\331\
>> \263\\053\\101\\366\\105\\154\\104\\165\\062\\046\\101\\136\\376\
>> \167\\260\\113\\263\\053\\101\\213\\236\\223\\165\\164\\062\\046\
>> \101\\010\\247\\033\\113\\056\\263\\053\\101\\376\\053\\330\\300\
>> \234\\067\\046\\101\\000'::bytea);
>> I am trying to convert a ESRI shape which is stored as a blob in SQL 
>> Server 2000 to postgis. I am using Npgsql to connect to postgis. This 
>> is the out I got from Npgsql. I know this is a valid shape and when I 
>> imported the data using shp2pgsql from the shape file it imported 
>> fine.
>>
>> Thank you,
>>
>> Regards,
>> Murali K. Maddali
>> UAI, Inc.
>> (256) 705-5191 (W)
>> murali.maddali at uai.com
>>
>> "Always bear in mind that your own resolution to succeed is more 
>> important than any one thing." - Abraham Lincoln
>>
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-- 

Milo van der Linden
mlinden at zeelandnet.nl <mailto:mlinden at zeelandnet.nl>
milovanderlinden at gmail.com <mailto:milovanderlinden at gmail.com>
milo at 3dsite.nl <mailto:milo at 3dsite.nl>
http://www.3dsite.nl

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