Comments for Nicklas Avéns blog http://blog.jordogskog.no Open Source (mostly) GIS in general and PostGIS in particular Sat, 19 Feb 2011 22:34:03 +0000 hourly 1 http://wordpress.org/?v=3.2.1 Comment on Strange behavior by design of the spatial function Filter in SQL Server 2008 by Nicklas Avén http://blog.jordogskog.no/2010/02/27/strange-behavior-by-design-of-the-spatial-function-filter-in-sql-server-2008/comment-page-1/#comment-6394 Nicklas Avén Sat, 19 Feb 2011 22:34:03 +0000 http://blog.jordogskog.no/?p=78#comment-6394 the point here is not the false positive answers from the filter function. The point is that the filter function in some situations give different answer in the select clause and the where clause depending on that the where part gets an answer index-based answer and the select part does not. /Nicklas the point here is not the false positive answers from the filter function. The point is that the filter function in some situations give different answer in the select clause and the where clause depending on that the where part gets an answer index-based answer and the select part does not.
/Nicklas

]]> Comment on Strange behavior by design of the spatial function Filter in SQL Server 2008 by David http://blog.jordogskog.no/2010/02/27/strange-behavior-by-design-of-the-spatial-function-filter-in-sql-server-2008/comment-page-1/#comment-6308 David Wed, 16 Feb 2011 17:23:57 +0000 http://blog.jordogskog.no/?p=78#comment-6308 You are correct, it may return false positives. However, the intended use is to get a smaller chunk of data out of a huge database really really fast. And THEN you use more precise filtering to narrow that smaller piece of data down to your final correct answer. If you were to only use the precise filters first, it would take far longer than this two step process. In a sense, it's like looking something up in a [real, paper book] encyclopedia - you would grab the book with generally what you want in it, like articles starting with En-Ez, and then look in the index in the back of that book to find exactly the article you want. You are correct, it may return false positives. However, the intended use is to get a smaller chunk of data out of a huge database really really fast. And THEN you use more precise filtering to narrow that smaller piece of data down to your final correct answer. If you were to only use the precise filters first, it would take far longer than this two step process.

In a sense, it’s like looking something up in a [real, paper book] encyclopedia – you would grab the book with generally what you want in it, like articles starting with En-Ez, and then look in the index in the back of that book to find exactly the article you want.

]]> Comment on Testing PostGIS 2.0 on PostGIS online by Nicklas Avén http://blog.jordogskog.no/2010/06/11/testing-next-release-of-postgis-on-postgis-online/comment-page-1/#comment-2929 Nicklas Avén Wed, 15 Sep 2010 12:57:58 +0000 http://blog.jordogskog.no/?p=175#comment-2929 Hallo Venkat PostGIS 2.0 is not released yet. It will be released springtime 2011. But if you want to test it in the state it is right now you have two options. If you are on windows platform you can try the experimental binaries found at this page: http://postgis.org/download/windows/experimental.php if you are at linux platform you have to compile yourself from source, but it is quite straight forward and is described in the PostGIS documentation. On the wikipages at : http://trac.osgeo.org/postgis you can also find information how to compile in windows, but that is a little bit more messy. But be aware 2.0 is just in quite early development state so it is not stable as the released versions. HTH /Nicklas Hallo Venkat

PostGIS 2.0 is not released yet. It will be released springtime 2011. But if you want to test it in the state it is right now you have two options. If you are on windows platform you can try the experimental binaries found at this page:
http://postgis.org/download/windows/experimental.php
if you are at linux platform you have to compile yourself from source, but it is quite straight forward and is described in the PostGIS documentation. On the wikipages at :
http://trac.osgeo.org/postgis
you can also find information how to compile in windows, but that is a little bit more messy.

But be aware 2.0 is just in quite early development state so it is not stable as the released versions.

HTH

/Nicklas

]]> Comment on Testing PostGIS 2.0 on PostGIS online by Venkat http://blog.jordogskog.no/2010/06/11/testing-next-release-of-postgis-on-postgis-online/comment-page-1/#comment-2925 Venkat Wed, 15 Sep 2010 06:23:43 +0000 http://blog.jordogskog.no/?p=175#comment-2925 hi, How do i upgrade postgis 1.5 to postgis 2.0 ? Please let me know.. Thanks and regards, Venkat hi,

How do i upgrade postgis 1.5 to postgis 2.0 ?

Please let me know..

Thanks and regards,

Venkat

]]> Comment on PostGIS online by nicklas.aven@jordogskog.no http://blog.jordogskog.no/2010/03/28/postgis-online/comment-page-1/#comment-206 nicklas.aven@jordogskog.no Mon, 29 Mar 2010 11:57:48 +0000 http://blog.jordogskog.no/?p=93#comment-206 Thanks! :-) Thanks!
:-)

]]> Comment on PostGIS online by alex http://blog.jordogskog.no/2010/03/28/postgis-online/comment-page-1/#comment-203 alex Mon, 29 Mar 2010 01:09:29 +0000 http://blog.jordogskog.no/?p=93#comment-203 Cool idea! keep up, thanks a lot. Cool idea!

keep up, thanks a lot.

]]> Comment on Strange behavior by design of the spatial function Filter in SQL Server 2008 by Isaac Kunen http://blog.jordogskog.no/2010/02/27/strange-behavior-by-design-of-the-spatial-function-filter-in-sql-server-2008/comment-page-1/#comment-101 Isaac Kunen Fri, 05 Mar 2010 07:02:07 +0000 http://blog.jordogskog.no/?p=78#comment-101 Hi Nicklas, Well, the trackback didn't work (I assume user error on my end) but I've posted a response here: http://blogs.msdn.com/isaac/archive/2010/03/04/filter-one-odd-duck.aspx The short version: yes it's odd. But it's a good thing. Cheers, -Isaac Hi Nicklas,

Well, the trackback didn’t work (I assume user error on my end) but I’ve posted a response here: http://blogs.msdn.com/isaac/archive/2010/03/04/filter-one-odd-duck.aspx

The short version: yes it’s odd. But it’s a good thing.

Cheers,
-Isaac

]]> Comment on A few words about this blog by Regina http://blog.jordogskog.no/2009/12/23/a-few-words-about-this-blog/comment-page-1/#comment-3 Regina Fri, 08 Jan 2010 04:55:15 +0000 http://blog.jordogskog.no/?p=21#comment-3 Nicklas, Nice to see you blogging :) Nicklas,
Nice to see you blogging :)

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