[Geoserver-users] Fetching data from multiple WFS

Sanket_Chandulal_Pat · December 18, 2008, 5:46pm

Hi,

I've set up 3 geoserver WFS. Each containing same feature data. I want to
fetch data from all 3 sources at the same time. So I'm partitioning data
based on bouding box. So if (minx,miny) and (maxx,maxy) are bounding box
coordinates, I'm doing horizontal partitioning of bouding box in 3 regions
as

Interval = (maxy-miny) / 3.
Region 1 BB: (minx,miny) , (maxx, miny+ Interval)
Region 2 BB: (minx,miny+Interval), (maxx, miny+2*Interval)
Region 3 BB: (minx,miny+2*Interval), (maxx,miny+3*interval)

Horizontal partition like this

|-------------------------------|
| |
| Region 1 |
| |
|-------------------------------|
| |
| Region 2 |
| |
|-------------------------------|
| |
| Region 3 |
| |
|-------------------------------|

Problems that I'm facing

1) I'm using get feature request within particular bounding box to fetch
data from each region. But there are some features whose geometry overlaps
with both regions. So they are not included in getfeature requests of any
of the region. (Since they are not within bounding box of any region)

Can anyone tell me how can I fetch such instances which overlaps with more
than one region?

2) I get response to each of the getfeature request as some GML data. Can
I perform spatial join on this GML data to merge the results? Is yes, then
how it can be done?

Thanks,
Sanket Patle.

Justin_Deoliveira · December 18, 2008, 6:53pm

Hi Sanket,

Responses inline. Out of curiosity what are the motivations for setting up such a scheme?

Sanket Chandulal Patle wrote:

Hi,

I've set up 3 geoserver WFS. Each containing same feature data. I want to
fetch data from all 3 sources at the same time. So I'm partitioning data
based on bouding box. So if (minx,miny) and (maxx,maxy) are bounding box
coordinates, I'm doing horizontal partitioning of bouding box in 3 regions
as

Interval = (maxy-miny) / 3.
Region 1 BB: (minx,miny) , (maxx, miny+ Interval)
Region 2 BB: (minx,miny+Interval), (maxx, miny+2*Interval)
Region 3 BB: (minx,miny+2*Interval), (maxx,miny+3*interval)

Horizontal partition like this

|-------------------------------|
| |
| Region 1 |
| |
|-------------------------------|
| |
| Region 2 |
| |
|-------------------------------|
| |
| Region 3 |
| |
|-------------------------------|

Problems that I'm facing

1) I'm using get feature request within particular bounding box to fetch
data from each region. But there are some features whose geometry overlaps
with both regions. So they are not included in getfeature requests of any
of the region. (Since they are not within bounding box of any region) >
Can anyone tell me how can I fetch such instances which overlaps with more
than one region?

THere is probably more than one way to do this, but could you just And two of the filters together. Something like:

<ogc:And>
   <ogc:BBOX>
     <BBOX filter for region 1>
   </ogc:BBOX>
     <BBOX filter for region 2>
   </ogc:BBOX>
</ogc:And>

If you wanted to all three regions in one query you would wrap them in an Or like:

<ogc:Or>

</ogc:Or>
   <ogc:And>
     <AND fitler for regions 1 and 2>
   </ogc:And>
     <AND fitler for regions 2 and 3>
   </ogc:And>
</ogc:And>

2) I get response to each of the getfeature request as some GML data. Can
I perform spatial join on this GML data to merge the results? Is yes, then
how it can be done?

Unfortunately not, geoserver does not really support joins in this manner. I can't think of an easy way to do this either.

Thanks,
Sanket Patle.

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OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.

Sanket_Chandulal_Pat · December 19, 2008, 4:52am

Hi Justin,

Thanks for reply. We want to make use of multiple WFS sources to fetch
data and reduce the total time for downloading the feature instances.
(When number of feature instances are in hundreds-thousands.)

My different regions here belongs to different WFS sources so

region 1 (WFS1) : http://10.129.13.8/geoserver/wfs
region 2 (WFS2) : http://10.112.117.29/geoserver/wfs

So I'll fetch some instances from one WFS and some instances from other. I
don't know how much it will be useful to reduce the total time. But still
a try.

1) One thing I would like to know how getFeature within BB works. So does
it returns instances which are completely inside given BB or instances
which are completely as well as partially inside given BB ?

So in your solution,

<ogc:And>
   <ogc:BBOX>
     <BBOX filter for region 1>
   </ogc:BBOX>
   </ogc:BBOX>
     <BBOX filter for region 2>
   </ogc:BBOX>
</ogc:And>

This will work only if getfeature also returns instaces which are
partially inside BB.

If your solution returns the instaces overlapping in both regions, then
I'll do parallel fetch from 2 WFS as:

First getFeature POST request to WFS1 = Fetch all instances within BB of
region 1+ Fetch instances overlapping in region 1 and region 2
Second getfeature POST request to WFS2 = Fetch all instances within BB of
region 2
Merge both results.

2) Also about spatial join of two GML, It's OK even if geoserver doesn't
provide any support for joining two GML files. I will write code for
spatial join, but I'm not getting any idea about how to proceed for it.
Couldn't get much information on web :(.

Thanks,
Sanket Patle.

Hi Sanket,

Responses inline. Out of curiosity what are the motivations for setting
up such a scheme?

Sanket Chandulal Patle wrote:

Hi,

I've set up 3 geoserver WFS. Each containing same feature data. I want
to
fetch data from all 3 sources at the same time. So I'm partitioning data
based on bouding box. So if (minx,miny) and (maxx,maxy) are bounding box
coordinates, I'm doing horizontal partitioning of bouding box in 3
regions
as

Interval = (maxy-miny) / 3.
Region 1 BB: (minx,miny) , (maxx, miny+ Interval)
Region 2 BB: (minx,miny+Interval), (maxx, miny+2*Interval)
Region 3 BB: (minx,miny+2*Interval), (maxx,miny+3*interval)

Horizontal partition like this

|-------------------------------|
| |
| Region 1 |
| |
|-------------------------------|
| |
| Region 2 |
| |
|-------------------------------|
| |
| Region 3 |
| |
|-------------------------------|

Problems that I'm facing

1) I'm using get feature request within particular bounding box to fetch
data from each region. But there are some features whose geometry
overlaps
with both regions. So they are not included in getfeature requests of
any
of the region. (Since they are not within bounding box of any region) >
Can anyone tell me how can I fetch such instances which overlaps with
more
than one region?

THere is probably more than one way to do this, but could you just And
two of the filters together. Something like:

<ogc:And>
   <ogc:BBOX>
     <BBOX filter for region 1>
   </ogc:BBOX>
   </ogc:BBOX>
     <BBOX filter for region 2>
   </ogc:BBOX>
</ogc:And>

If you wanted to all three regions in one query you would wrap them in
an Or like:

<ogc:Or>

</ogc:Or>
   <ogc:And>
     <AND fitler for regions 1 and 2>
   </ogc:And>
   </ogc:And>
     <AND fitler for regions 2 and 3>
   </ogc:And>
</ogc:And>

2) I get response to each of the getfeature request as some GML data.
Can
I perform spatial join on this GML data to merge the results? Is yes,
then
how it can be done?

Unfortunately not, geoserver does not really support joins in this
manner. I can't think of an easy way to do this either.

Thanks,
Sanket Patle.

------------------------------------------------------------------------------
SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas,
Nevada.
The future of the web can't happen without you. Join us at MIX09 to
help
pave the way to the Next Web now. Learn more and register at
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_______________________________________________
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--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.

Justin_Deoliveira · December 19, 2008, 5:37pm

Sanket Chandulal Patle wrote:

Hi Justin,

Thanks for reply. We want to make use of multiple WFS sources to fetch
data and reduce the total time for downloading the feature instances.
(When number of feature instances are in hundreds-thousands.)

My different regions here belongs to different WFS sources so

region 1 (WFS1) : http://10.129.13.8/geoserver/wfs
region 2 (WFS2) : http://10.112.117.29/geoserver/wfs

So I'll fetch some instances from one WFS and some instances from other. I
don't know how much it will be useful to reduce the total time. But still
a try.

Interesting :).

1) One thing I would like to know how getFeature within BB works. So does
it returns instances which are completely inside given BB or instances
which are completely as well as partially inside given BB ?

It will return both features which are entirely contained and partially contained. You can use the ogc:Contains filter to ensure only those which are entirely contained are returned.

So in your solution,

<ogc:And>
   <ogc:BBOX>
     <BBOX filter for region 1>
   </ogc:BBOX>
     <BBOX filter for region 2>
   </ogc:BBOX>
</ogc:And>

This will work only if getfeature also returns instaces which are
partially inside BB.

If your solution returns the instaces overlapping in both regions, then
I'll do parallel fetch from 2 WFS as:

First getFeature POST request to WFS1 = Fetch all instances within BB of
region 1+ Fetch instances overlapping in region 1 and region 2
Second getfeature POST request to WFS2 = Fetch all instances within BB of
region 2
Merge both results.

2) Also about spatial join of two GML, It's OK even if geoserver doesn't
provide any support for joining two GML files. I will write code for
spatial join, but I'm not getting any idea about how to proceed for it.
Couldn't get much information on web :(.

Yeah, it is sort of tricky. The only way i can think of to do it would be:

1. Download the 2 / 3 wfs requests to xml files
2. Create a third file to merge them
3. Write the wfs:FeatureCollection element to the merged file
4. Parse (using SAX) each of the individual files pulling out wach "gml:featureMember" element, and write that to the merged file.
5. Close the wfs:FeatureCollection element

A very brute force approach, and not the most efficient. What will be done with the end result of the features from the wfs? Will they be rendered? Or will you actually have to deliver them somewhere in gml?

Thanks,
Sanket Patle.

Hi Sanket,

Responses inline. Out of curiosity what are the motivations for setting
up such a scheme?

Sanket Chandulal Patle wrote:

Hi,

I've set up 3 geoserver WFS. Each containing same feature data. I want
to
fetch data from all 3 sources at the same time. So I'm partitioning data
based on bouding box. So if (minx,miny) and (maxx,maxy) are bounding box
coordinates, I'm doing horizontal partitioning of bouding box in 3
regions
as

Interval = (maxy-miny) / 3.
Region 1 BB: (minx,miny) , (maxx, miny+ Interval)
Region 2 BB: (minx,miny+Interval), (maxx, miny+2*Interval)
Region 3 BB: (minx,miny+2*Interval), (maxx,miny+3*interval)

Horizontal partition like this

|-------------------------------|
| |
| Region 1 |
| |
|-------------------------------|
| |
| Region 2 |
| |
|-------------------------------|
| |
| Region 3 |
| |
|-------------------------------|

Problems that I'm facing

1) I'm using get feature request within particular bounding box to fetch
data from each region. But there are some features whose geometry
overlaps
with both regions. So they are not included in getfeature requests of
any
of the region. (Since they are not within bounding box of any region) >
Can anyone tell me how can I fetch such instances which overlaps with
more
than one region?

THere is probably more than one way to do this, but could you just And
two of the filters together. Something like:

<ogc:And>
   <ogc:BBOX>
     <BBOX filter for region 1>
   </ogc:BBOX>
     <BBOX filter for region 2>
   </ogc:BBOX>
</ogc:And>

If you wanted to all three regions in one query you would wrap them in
an Or like:

<ogc:Or>

</ogc:Or>
   <ogc:And>
     <AND fitler for regions 1 and 2>
   </ogc:And>
     <AND fitler for regions 2 and 3>
   </ogc:And>
</ogc:And>

2) I get response to each of the getfeature request as some GML data.
Can
I perform spatial join on this GML data to merge the results? Is yes,
then
how it can be done?

Unfortunately not, geoserver does not really support joins in this
manner. I can't think of an easy way to do this either.

Thanks,
Sanket Patle.

------------------------------------------------------------------------------
SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas,
Nevada.
The future of the web can't happen without you. Join us at MIX09 to
help
pave the way to the Next Web now. Learn more and register at
http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/
_______________________________________________
Geoserver-users mailing list
Geoserver-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geoserver-users

--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.

--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.

Sanket_Chandulal_Pat · December 22, 2008, 6:42pm

Hi Justin,

I guess the data that we integrate from different sources is used for
rendering and querying purpose (I'm new to this project and not much sure
how user of this tool render or make query on data ). The tool makes
use of ontologies for inter-operability between web feature sources. YOu
can find more info at http://www.cse.iitb.ac.in/FIGO/tool/.

The solution that you told to merge the two GML file will work. I'm yet to
write the code for that.

One more thing, I want a large test data to test the performance of the my
parallel fetch application . Where I can get such data?

Thanks,
Sanket Patle.

Sanket Chandulal Patle wrote:

Hi Justin,

Thanks for reply. We want to make use of multiple WFS sources to fetch
data and reduce the total time for downloading the feature instances.
(When number of feature instances are in hundreds-thousands.)

My different regions here belongs to different WFS sources so

region 1 (WFS1) : http://10.129.13.8/geoserver/wfs
region 2 (WFS2) : http://10.112.117.29/geoserver/wfs

So I'll fetch some instances from one WFS and some instances from other.
I
don't know how much it will be useful to reduce the total time. But
still
a try.

Interesting :).

1) One thing I would like to know how getFeature within BB works. So
does
it returns instances which are completely inside given BB or instances
which are completely as well as partially inside given BB ?

It will return both features which are entirely contained and partially
contained. You can use the ogc:Contains filter to ensure only those
which are entirely contained are returned.

So in your solution,

<ogc:And>
   <ogc:BBOX>
     <BBOX filter for region 1>
   </ogc:BBOX>
   </ogc:BBOX>
     <BBOX filter for region 2>
   </ogc:BBOX>
</ogc:And>

This will work only if getfeature also returns instaces which are
partially inside BB.

If your solution returns the instaces overlapping in both regions, then
I'll do parallel fetch from 2 WFS as:

First getFeature POST request to WFS1 = Fetch all instances within BB of
region 1+ Fetch instances overlapping in region 1 and region 2
Second getfeature POST request to WFS2 = Fetch all instances within BB
of
region 2
Merge both results.

2) Also about spatial join of two GML, It's OK even if geoserver doesn't
provide any support for joining two GML files. I will write code for
spatial join, but I'm not getting any idea about how to proceed for it.
Couldn't get much information on web :(.

Yeah, it is sort of tricky. The only way i can think of to do it would be:

1. Download the 2 / 3 wfs requests to xml files
2. Create a third file to merge them
3. Write the wfs:FeatureCollection element to the merged file
4. Parse (using SAX) each of the individual files pulling out wach
"gml:featureMember" element, and write that to the merged file.
5. Close the wfs:FeatureCollection element

A very brute force approach, and not the most efficient. What will be
done with the end result of the features from the wfs? Will they be
rendered? Or will you actually have to deliver them somewhere in gml?

Thanks,
Sanket Patle.

Hi Sanket,

Responses inline. Out of curiosity what are the motivations for setting
up such a scheme?

Sanket Chandulal Patle wrote:

Hi,

I've set up 3 geoserver WFS. Each containing same feature data. I want
to
fetch data from all 3 sources at the same time. So I'm partitioning
data
based on bouding box. So if (minx,miny) and (maxx,maxy) are bounding
box
coordinates, I'm doing horizontal partitioning of bouding box in 3
regions
as

Interval = (maxy-miny) / 3.
Region 1 BB: (minx,miny) , (maxx, miny+ Interval)
Region 2 BB: (minx,miny+Interval), (maxx, miny+2*Interval)
Region 3 BB: (minx,miny+2*Interval), (maxx,miny+3*interval)

Horizontal partition like this

|-------------------------------|
| |
| Region 1 |
| |
|-------------------------------|
| |
| Region 2 |
| |
|-------------------------------|
| |
| Region 3 |
| |
|-------------------------------|

Problems that I'm facing

1) I'm using get feature request within particular bounding box to
fetch
data from each region. But there are some features whose geometry
overlaps
with both regions. So they are not included in getfeature requests of
any
of the region. (Since they are not within bounding box of any region)
>
Can anyone tell me how can I fetch such instances which overlaps with
more
than one region?

THere is probably more than one way to do this, but could you just And
two of the filters together. Something like:

<ogc:And>
   <ogc:BBOX>
     <BBOX filter for region 1>
   </ogc:BBOX>
   </ogc:BBOX>
     <BBOX filter for region 2>
   </ogc:BBOX>
</ogc:And>

If you wanted to all three regions in one query you would wrap them in
an Or like:

<ogc:Or>

</ogc:Or>
   <ogc:And>
     <AND fitler for regions 1 and 2>
   </ogc:And>
   </ogc:And>
     <AND fitler for regions 2 and 3>
   </ogc:And>
</ogc:And>

2) I get response to each of the getfeature request as some GML data.
Can
I perform spatial join on this GML data to merge the results? Is yes,
then
how it can be done?

Unfortunately not, geoserver does not really support joins in this
manner. I can't think of an easy way to do this either.

Thanks,
Sanket Patle.

------------------------------------------------------------------------------
SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas,
Nevada.
The future of the web can't happen without you. Join us at MIX09 to
help
pave the way to the Next Web now. Learn more and register at
http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/
_______________________________________________
Geoserver-users mailing list
Geoserver-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/geoserver-users

--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.

--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.

Jukka_Rahkonen · December 22, 2008, 8:39pm

Hi,

OpenStreetMap data is fine for testing WFS. Planet.osm that holds all the data should be big enough. Download the planet file, import it to PostGIS with osm2pgsql utility and have a try.

-Jukka Rahkonen-

Sanket Chandulal Patle wrote:

Hi Justin,

I guess the data that we integrate from different sources is used for

rendering and querying purpose (I'm new to this project and not much sure
how user of this tool render or make query on data ). The tool makes
use of ontologies for inter-operability between web feature sources. YOu
can find more info at http://www.cse.iitb.ac.in/FIGO/tool/.

The solution that you told to merge the two GML file will work. I'm yet to

write the code for that.

One more thing, I want a large test data to test the performance of the my

parallel fetch application . Where I can get such data?

Thanks,
Sanket Patle.

Justin_Deoliveira · December 23, 2008, 4:51pm

Hi Sanket,

Just a quick note. If all you need to do is visualize the data pulling it all down into gml might not be the best way to do it. You may want to make use of the Geoserver WMS for all visualization. You can still achieve query functionality via WFS with GetFeature but only the for a constrained area.

Of course if you do require GML at the end of the day then I guess you have no choice :).

-Justin

Sanket Chandulal Patle wrote:

Hi Justin,

I guess the data that we integrate from different sources is used for
rendering and querying purpose (I'm new to this project and not much sure
how user of this tool render or make query on data ). The tool makes
use of ontologies for inter-operability between web feature sources. YOu
can find more info at http://www.cse.iitb.ac.in/FIGO/tool/.

The solution that you told to merge the two GML file will work. I'm yet to
write the code for that.

One more thing, I want a large test data to test the performance of the my
parallel fetch application . Where I can get such data?

Thanks,
Sanket Patle.

Sanket Chandulal Patle wrote:

Hi Justin,

Thanks for reply. We want to make use of multiple WFS sources to fetch
data and reduce the total time for downloading the feature instances.
(When number of feature instances are in hundreds-thousands.)

My different regions here belongs to different WFS sources so

region 1 (WFS1) : http://10.129.13.8/geoserver/wfs
region 2 (WFS2) : http://10.112.117.29/geoserver/wfs

So I'll fetch some instances from one WFS and some instances from other.
I
don't know how much it will be useful to reduce the total time. But
still
a try.

Interesting :).

1) One thing I would like to know how getFeature within BB works. So
does
it returns instances which are completely inside given BB or instances
which are completely as well as partially inside given BB ?

It will return both features which are entirely contained and partially
contained. You can use the ogc:Contains filter to ensure only those
which are entirely contained are returned.

So in your solution,

<ogc:And>
   <ogc:BBOX>
     <BBOX filter for region 1>
   </ogc:BBOX>
     <BBOX filter for region 2>
   </ogc:BBOX>
</ogc:And>

This will work only if getfeature also returns instaces which are
partially inside BB.

If your solution returns the instaces overlapping in both regions, then
I'll do parallel fetch from 2 WFS as:

First getFeature POST request to WFS1 = Fetch all instances within BB of
region 1+ Fetch instances overlapping in region 1 and region 2
Second getfeature POST request to WFS2 = Fetch all instances within BB
of
region 2
Merge both results.

2) Also about spatial join of two GML, It's OK even if geoserver doesn't
provide any support for joining two GML files. I will write code for
spatial join, but I'm not getting any idea about how to proceed for it.
Couldn't get much information on web :(.

Yeah, it is sort of tricky. The only way i can think of to do it would be:

1. Download the 2 / 3 wfs requests to xml files
2. Create a third file to merge them
3. Write the wfs:FeatureCollection element to the merged file
4. Parse (using SAX) each of the individual files pulling out wach
"gml:featureMember" element, and write that to the merged file.
5. Close the wfs:FeatureCollection element

A very brute force approach, and not the most efficient. What will be
done with the end result of the features from the wfs? Will they be
rendered? Or will you actually have to deliver them somewhere in gml?

Thanks,
Sanket Patle.

Hi Sanket,

Responses inline. Out of curiosity what are the motivations for setting
up such a scheme?

Sanket Chandulal Patle wrote:

Hi,

I've set up 3 geoserver WFS. Each containing same feature data. I want
to
fetch data from all 3 sources at the same time. So I'm partitioning
data
based on bouding box. So if (minx,miny) and (maxx,maxy) are bounding
box
coordinates, I'm doing horizontal partitioning of bouding box in 3
regions
as

Interval = (maxy-miny) / 3.
Region 1 BB: (minx,miny) , (maxx, miny+ Interval)
Region 2 BB: (minx,miny+Interval), (maxx, miny+2*Interval)
Region 3 BB: (minx,miny+2*Interval), (maxx,miny+3*interval)

Horizontal partition like this

|-------------------------------|
| |
| Region 1 |
| |
|-------------------------------|
| |
| Region 2 |
| |
|-------------------------------|
| |
| Region 3 |
| |
|-------------------------------|

Problems that I'm facing

1) I'm using get feature request within particular bounding box to
fetch
data from each region. But there are some features whose geometry
overlaps
with both regions. So they are not included in getfeature requests of
any
of the region. (Since they are not within bounding box of any region)
Can anyone tell me how can I fetch such instances which overlaps with
more
than one region?

THere is probably more than one way to do this, but could you just And
two of the filters together. Something like:

<ogc:And>
   <ogc:BBOX>
     <BBOX filter for region 1>
   </ogc:BBOX>
     <BBOX filter for region 2>
   </ogc:BBOX>
</ogc:And>

If you wanted to all three regions in one query you would wrap them in
an Or like:

<ogc:Or>

</ogc:Or>
   <ogc:And>
     <AND fitler for regions 1 and 2>
   </ogc:And>
     <AND fitler for regions 2 and 3>
   </ogc:And>
</ogc:And>

2) I get response to each of the getfeature request as some GML data.
Can
I perform spatial join on this GML data to merge the results? Is yes,
then
how it can be done?

Unfortunately not, geoserver does not really support joins in this
manner. I can't think of an easy way to do this either.

Thanks,
Sanket Patle.

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--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.

--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.

--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.