Hi,
Actually I thought that there would be no need to for parsing because the
method in the link seemed to support BBOX as it is. But perhaps it is not
native JTS method but some GeoTools method built upon it?
Another link from the same source:
http://docs.geotools.org/stable/javadocs/org/opengis/geometry/BoundingBox.html
Parsing WMS BBOX to polygon should not be difficult for a programmer. This is
how I have been building WKT polygons with SQL after splitting BBOX parameters
into separate fields (xmin, ymin, xmax, ymax)
select 'POLYGON (('||BBOX_XMIN || ' ' || BBOX_YMIN||','
||BBOX_XMIN || ' ' || BBOX_YMAX||','
||BBOX_XMAX || ' ' || BBOX_YMAX||','
||BBOX_XMAX || ' ' || BBOX_YMIN||','
||BBOX_XMIN || ' ' || BBOX_YMIN||'))'
from BBOX
I have three other ideas for making the utility even more usable:
1) X and Y in BBOX can mean easting and northing or vice versa depending on the
coordinate reference system. The utility could have a selection "Consider that
coordinates are in northing-easting order". The default should be
easting-northing.
2) Find BBOX parameter from the long lines of the raw WMS server logs. One line
may look like
127.0.0.1 - - [04/Sep/2009:11:22:19 +0300] "GET
/cgi-bin/mapserv.exe?map=c:\\ms4w\\osm.map&REQUEST=GetMap&SERVICE=WMS&VERSION=1.1.1&WIDTH=783&HEIGHT=627&LAYERS=default&TRANSPARENT=TRUE&FORMAT=image%2Fpng&BBOX=3379680.3596462687,6672344.5722924275,3402683.352219573,6690764.593165304&SRS=epsg:2393&STYLES=
HTTP/1.1" 200 749141
3) Parse also some other WMS parameters from the request and place them as
attributes of the OpenJUMP polygons in the result layer. Most useful would be
LAYERS, WIDTH and HEIGHT.
Parameters in WMS request can be in any order. For recognizing them utility
should investige the parameter name (KEYWORD=) and remember, that parameter
value ends ends either to "&" craracter or to newline if it happens to be the
last one.
Just parsing text file with plain bounding boxes
BBOX=360736,7151616,373024,7163904 into polygons would immediately be an useful
tool for real world needs and such tool does not exist in any GIS program I
know. Thus it would match fine with OpenJUMP itself: lightweight, clever and
useful.
-Jukka-
________________________________________
Lähettäjä: Landon Blake [sunburned.surve...@gmail.com]
Lähetetty: 17. tammikuuta 2013 18:25
Vastaanottaja: OpenJump develop and use
Aihe: Re: [JPP-Devel] How to convert WMS BBOX into polygon feature?
Hmmmm. Should be too hard to process that. If we whip up a plug-in
that parses that data in a text file and adds an OJ layer, will that
work?
Landon
On Wed, Jan 16, 2013 at 6:57 AM, Rahkonen Jukka
<jukka.rahko...@mmmtike.fi> wrote:
> Hi,
>
> Here comes a sample.
>
> -Jukka-
>
> Landon Blake wrote:
>>
>> Jukka:
>>
>> Do you get the list of Bounding Boxes in a text file or similar format? Can
>> you
>> send me a sample.
>>
>> I may be able to help.
>>
>> Landon
>>
>> On Wed, Jan 16, 2013 at 2:46 AM, Rahkonen Jukka
>> <jukka.rahko...@mmmtike.fi> wrote:
>> > Hi,
>> >
>> > I would like to do some analysis of WMS server log by converting the
>> recorded BBOX parameters (BBOX=360736,7151616,373024,7163904) into
>> polygons. I guess it would be rather an easy task for an OJ programmer
>> because JTS has a function for that.
>> >
>> > http://docs.geotools.org/stable/javadocs/org/geotools/geometry/jts/JTS
>> >
>> .html#toGeometry%28org.opengis.geometry.BoundingBox,%20com.vividsol
>> uti
>> > ons.jts.geom.GeometryFactory%29
>> >
>> > Do you agree? Is anybody there willing to have a try with Beanshell or
>> something? I have managed to do the conversion with Spatialite and SQL by
>> importing the BBOXes into database as a text file first I it would be a bit
>> faster
>> to use just OJ.
>> >
>> > -Jukka Rahkonen-
>> >
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