Jukka, Can you send me one of the GML files you are working with? I'd like to take a look at the format of the file, if you don't mind.
SS On Thu, Nov 20, 2008 at 1:26 PM, Rahkonen Jukka <[EMAIL PROTECTED]> wrote: > Hi, > > Some of us are using WFS that sends either GML2 (WFS v. 1.0.0) or GML3 (WFS > v. 1.1.0). Now it is parsed by the WFS plugin that does a lot of other > things as well by taking care about building standard compliant requests etc. > However, sometimes it could be useful to read a dataset from WFS server with > direct requests sent from browser of with wget or something and store the gml > file on disk for the future needs. For example for making a backup of > server's data or just a local copy to be used off-line. Now the workflow is > Download GML2 - Convert so shapefile with ogr2ogr - Read shapefile into OJ. > > -Jukka Rahkonen- > > > -----Alkuperäinen viesti----- > Lähettäjä: Sunburned Surveyor [mailto:[EMAIL PROTECTED] > Lähetetty: to 20.11.2008 23:04 > Vastaanottaja: OpenJump develop and use > Aihe: Re: [JPP-Devel] Question about GML Support in OJ and LinearRing. > > I'm glad I reached the same conclusion as you did Larry. I'll post a > message to the user list to ask about how many users are using GML. > > SS > > On Thu, Nov 20, 2008 at 12:29 PM, Larry Becker <[EMAIL PROTECTED]> wrote: >> Hi SS, >> >> I basically came to the same conclusions. I looked into implementing an >> XML pull parser version, but never got started. I managed to eventually >> hack up a KML Reader that kind of worked (it took me more than 20 hours), >> and I wasn't sure how much demand there would be for a better one. I found >> ut that it was fantastically easy to break the current GMLReader. Almost >> any change I made caused it go into the wrong state and then it was lost. >> >> I have had pretty good luck with pull parsers in other software, but this >> is not an easy problem. Personally, I wouldn't waste much time solving it >> unless someone can justify a credible use case. >> >> regards, >> Larry >> >> >> >> On Thu, Nov 20, 2008 at 2:15 PM, Sunburned Surveyor >> <[EMAIL PROTECTED]> wrote: >>> >>> I couldn't help myself, and I looked at the code over the code for >>> GMLReader over my lunch break. Larry is correct, the code is pretty >>> gnarly. I believe the use of a state machine is caused by the fact >>> that a SAX parser pushes xml events to the class. This problem could >>> be avoided if you used something like JDOM or an XML pull parser. >>> >>> The good news is I can fix the code to read linear rings. The bad news >>> is it would take me probably 10 to 20 hours. I'd have to really dig >>> into the class so I could understand what was going on. I think the >>> code complex enough that if you just tried to add a few lines of code >>> you'd dork something up. >>> >>> Here are the options, in my opinion: >>> >>> [1] Leave things as they are. The GMLReader class won't read >>> LinearRings. Close the bug report. >>> [2] Add support for reading linear rings to the exisitng GMLReader >>> class. If I did this work I would probably reorganize all the stinking >>> if statements and other conditional tests into some private methods so >>> the class was easier to read and maintain. I'd also want to document >>> the way the class works for the next fool that trys to fix a bug with >>> GML import. >>> [3] Write a new GMLReader class that uses an XML pull-parser. This >>> would greatly simplify the class and make it easier to >>> improve/maintain GML import. I think this would take about the same >>> amount of time as understanding the existing class would take. I also >>> think it would be possible to remove the need for an input template by >>> automatically detecting the data type of attribute values. If I went >>> this route I could allow the user to override this automatic data type >>> detection with a simple properties file. I think removing the need for >>> an input template would make GML 2.0 import a lot easier for the user. >>> >>> I'm looking for advice on the best way to proceed. Which option would >>> benefit the community the most? If no one really cares about GML 2.0 >>> (I don't know how many of us are using it) then I will make my own >>> decision and move forward. >>> >>> The Sunburned Surveyor >>> >>> On Thu, Nov 20, 2008 at 11:36 AM, Sunburned Surveyor >>> <[EMAIL PROTECTED]> wrote: >>> > Thanks for the files Larry. There are some comments on the state >>> > machine in the Javadoc for the GMLReader class, but no diagram. I'm >>> > sure you looked at this when you were attempting to make your KML >>> > Reader. >>> > >>> > I'll take a peek at the code today after work I hope. >>> > >>> > SS >>> > >>> > On Thu, Nov 20, 2008 at 10:57 AM, Larry Becker <[EMAIL PROTECTED]> >>> > wrote: >>> >> You can create LinearRings by using the Geometry Converter plugin. OJ >>> >> supports writing LinearRings to GML, but not reading them. See the >>> >> attached >>> >> files. I have looked at the GMLReader code when morphing it into the >>> >> KML >>> >> Reader. It isn't going to be easy to modify, and has so far resisted >>> >> all my >>> >> attempts at making a KML Reader that supports Attributes. The code is >>> >> a >>> >> very complex state machine. What would help is the state diagram that >>> >> was >>> >> used to create the original code. >>> >> >>> >> regards, >>> >> Larry >>> >> >>> >> On Thu, Nov 20, 2008 at 12:07 PM, Sunburned Surveyor >>> >> <[EMAIL PROTECTED]> wrote: >>> >>> >>> >>> Martin, >>> >>> >>> >>> Thanks for your valuable input. I will look at the code, but I suspect >>> >>> the best thing to do is to load LinearRings as LineStrings and ecplain >>> >>> this behavior in the Javadoc. >>> >>> >>> >>> I'll report back to the list when I have a patch. >>> >>> >>> >>> SS >>> >>> >>> >>> On Thu, Nov 20, 2008 at 10:00 AM, Martin Davis >>> >>> <[EMAIL PROTECTED]> >>> >>> wrote: >>> >>> > Well, it's a valid geometry type in JTS, so it should work in OJ. >>> >>> > There >>> >>> > may be limitations in how it can be manipulated, however - e.g. I >>> >>> > suspect that it can't be edited (or at least that if it is it will >>> >>> > revert to a plain ol LineString). >>> >>> > >>> >>> > If this is a concern, another option is to load LinearRings as >>> >>> > LineStrings. They should NOT be loaded as Polygons - LinearRings >>> >>> > are >>> >>> > not areas. >>> >>> > >>> >>> > Sunburned Surveyor wrote: >>> >>> >> Martin, >>> >>> >> >>> >>> >> Is that a valid feature geometry type in OpenJUMP? I didn't know >>> >>> >> that >>> >>> >> it was. If it is, then this probably is a bug that needs to get >>> >>> >> fixed. >>> >>> >> >>> >>> >> SS >>> >>> >> >>> >>> >> On Thu, Nov 20, 2008 at 9:06 AM, Martin Davis >>> >>> >> <[EMAIL PROTECTED]> >>> >>> >> wrote: >>> >>> >> >>> >>> >>> Why not read the GML LinearRing into a JTS LinearRing? >>> >>> >>> >>> >>> >>> Sunburned Surveyor wrote: >>> >>> >>> >>> >>> >>>> Well, it seems from a "robustness" perspective that it would be >>> >>> >>>> good >>> >>> >>>> to read in linear rings, even if they are always represented >>> >>> >>>> internally and exported as polygons. >>> >>> >>>> >>> >>> >>>> I will wait for other programmers to comment on what they think >>> >>> >>>> the >>> >>> >>>> best course is, then I will implement the needed changes. >>> >>> >>>> >>> >>> >>>> SS >>> >>> >>>> >>> >>> >>>> On Thu, Nov 20, 2008 at 8:38 AM, Andreas Schmitz >>> >>> >>>> <[EMAIL PROTECTED]> >>> >>> >>>> wrote: >>> >>> >>>> >>> >>> >>>> >>> >>> >>>>> Sunburned Surveyor wrote: >>> >>> >>>>> >>> >>> >>>>> Hi, >>> >>> >>>>> >>> >>> >>>>> >>> >>> >>>>> >>> >>> >>>>>> I'm working on one of the OJ 1.2 bugs I selected for squishing >>> >>> >>>>>> and >>> >>> >>>>>> I >>> >>> >>>>>> had a quick question. >>> >>> >>>>>> >>> >>> >>>>>> Is the GML reader in OpenJUMP supposed to read features >>> >>> >>>>>> represented >>> >>> >>>>>> by >>> >>> >>>>>> a LinearRing? I thought a LinearRing was only used as an >>> >>> >>>>>> exterior >>> >>> >>>>>> or >>> >>> >>>>>> interior boundary of a polygon. A user filed a bug report >>> >>> >>>>>> because a >>> >>> >>>>>> feature geometry wasn't created from a LinearRing using JUMP's >>> >>> >>>>>> GMLReader. But I'm thikning that this isn't a bug, but an >>> >>> >>>>>> improper >>> >>> >>>>>> understanding of how feature geometries are represented in GML. >>> >>> >>>>>> A >>> >>> >>>>>> feature should be represented by a polygon, not a linear ring. >>> >>> >>>>>> >>> >>> >>>>>> If GMLReader is supposed to construct a feature goemetry >>> >>> >>>>>> (polygon?) >>> >>> >>>>>> from a linear ring, then I'll fix the bug. If GMLReader is not >>> >>> >>>>>> supposed to do this, because it isn't the proper way to >>> >>> >>>>>> represent a >>> >>> >>>>>> feature, then I will close the bug. >>> >>> >>>>>> >>> >>> >>>>>> >>> >>> >>>>> I think in GML2 this is allowed: >>> >>> >>>>> >>> >>> >>>>> http://schemas.opengis.net/gml/2.1.2/geometry.xsd >>> >>> >>>>> >>> >>> >>>>> One can always wonder why anyone would want it, but some people >>> >>> >>>>> apparently have >>> >>> >>>>> use cases for everything... The problem that is inherent here >>> >>> >>>>> is, if >>> >>> >>>>> you read >>> >>> >>>>> the linear ring in as a polygon, what happens when exporting as >>> >>> >>>>> GML >>> >>> >>>>> again? Will >>> >>> >>>>> it be exported as polygon or as linear ring? Is every linear >>> >>> >>>>> ring >>> >>> >>>>> also a >>> >>> >>>>> polygon? I suppose not, as there are almost no restrictions on >>> >>> >>>>> the >>> >>> >>>>> form of a >>> >>> >>>>> linear ring, but many (such as orientation of the rings, self >>> >>> >>>>> intersections >>> >>> >>>>> etc.) on polygons. >>> >>> >>>>> >>> >>> >>>>> I'm unsure on how to solve this problem though, the better you >>> >>> >>>>> want >>> >>> >>>>> to solve it, >>> >>> >>>>> the more work it is obviously. >>> >>> >>>>> >>> >>> >>>>> Best regards, Andreas >>> >>> >>>>> -- >>> >>> >>>>> l a t / l o n GmbH >>> >>> >>>>> Aennchenstrasse 19 53177 Bonn, Germany >>> >>> >>>>> phone ++49 +228 18496-12 fax ++49 +228 1849629 >>> >>> >>>>> http://www.lat-lon.de http://www.deegree.org >>> >>> >>>>> >>> >>> >>>>> -----BEGIN PGP SIGNATURE----- >>> >>> >>>>> Version: GnuPG v1.4.9 (GNU/Linux) >>> >>> >>>>> >>> >>> >>>>> iEYEARECAAYFAkklkpUACgkQ737OVr+Ru7pgtACg5bMBBMLlo3wNsiXw7D+BB0tz >>> >>> >>>>> OG8AoJc+QpDAnPZ2NTA+K//fxBcsCHI7 >>> >>> >>>>> =9hXg >>> >>> >>>>> -----END PGP SIGNATURE----- >>> 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challenge >>> >>> >>> Build the coolest Linux based applications with Moblin SDK & win >>> >>> >>> great >>> >>> >>> prizes >>> >>> >>> Grand prize is a trip for two to an Open Source event anywhere in >>> >>> >>> the >>> >>> >>> world >>> >>> >>> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >>> >>> >>> _______________________________________________ >>> >>> >>> Jump-pilot-devel mailing list >>> >>> >>> Jump-pilot-devel@lists.sourceforge.net >>> >>> >>> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >>> >>> >>> >>> >>> >>> >>> >>> >> >>> >>> >> >>> >>> >> >>> >>> >> ------------------------------------------------------------------------- >>> >>> >> This SF.Net email is sponsored by the Moblin Your Move Developer's >>> >>> >> challenge >>> >>> >> Build the coolest Linux based applications with Moblin SDK & win >>> >>> >> great >>> >>> >> prizes >>> >>> >> Grand prize is a trip for two to an Open Source event anywhere in >>> >>> >> the >>> >>> >> world >>> 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------------------------------------------------------------------------- >>> >> This SF.Net email is sponsored by the Moblin Your Move Developer's >>> >> challenge >>> >> Build the coolest Linux based applications with Moblin SDK & win great >>> >> prizes >>> >> Grand prize is a trip for two to an Open Source event anywhere in the >>> >> world >>> >> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >>> >> _______________________________________________ >>> >> Jump-pilot-devel mailing list >>> >> Jump-pilot-devel@lists.sourceforge.net >>> >> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >>> >> >>> >> >>> > >>> >>> ------------------------------------------------------------------------- >>> This SF.Net email is sponsored by the Moblin Your Move Developer's >>> challenge >>> Build the coolest Linux based applications with Moblin SDK & win great >>> prizes >>> Grand prize is a trip for two to an Open Source event anywhere in the >>> world >>> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >>> _______________________________________________ >>> Jump-pilot-devel mailing list >>> Jump-pilot-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >> >> >> >> -- >> http://amusingprogrammer.blogspot.com/ >> >> ------------------------------------------------------------------------- >> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge >> Build the coolest Linux based applications with Moblin SDK & win great >> prizes >> Grand prize is a trip for two to an Open Source event anywhere in the world >> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >> _______________________________________________ >> Jump-pilot-devel mailing list >> Jump-pilot-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >> >> > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > 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