In response to the question about saving polygons, it is also worth
looking at Format.WKT as this produces polygons in OGC compliant format
which can then be inserted into a spatially enabled database such as
Postgres or MySQL.
Somthing like
layer.events.register('featureadded', this, function(obj){
var wktwriter=new OpenLayers.Format.WKT();
var wkt=wktwriter.write(obj.feature);
}
wkt will now look something like POLYGON(( x1 y1, x2 y2, .....x1, y1))
and you can insert this into a geometry column of a db using the
geomfromtext function.
dev-requ...@openlayers.org wrote:
> Send Dev mailing list submissions to
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>
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> or, via email, send a message with subject or body 'help' to
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>
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> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Dev digest..."
>
>
> Today's Topics:
>
> 1. Geotiff from database (Ashwin Dhakal)
> 2. preserving scale on base layer switching (Tim Schaub)
> 3. Re: Save drawn polygon (Tim Schaub)
> 4. Re: preserving scale on base layer switching (Andreas Hocevar)
> 5. Re: onImageLoadError not triggered on Google Chrome for some
> missing Tilecache tiles... (TonnyCZ)
> 6. reproject using vector and protocol (WFS) is not working
> (Steven M. Ottens)
> 7. Re: reproject using vector and protocol (WFS) is not working
> (Bart van den Eijnden)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 2 Feb 2010 13:05:32 -0800 (PST)
> From: Ashwin Dhakal <ashwindha...@yahoo.com>
> Subject: [OpenLayers-Dev] Geotiff from database
> To: Dev@openlayers.org
> Message-ID: <239605.56632...@web52303.mail.re2.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
> Hi all
> I am working a project which I have to finish very soon but I have a problem
> with open layers. How can I import Geotiff image from postgis database. any
> one has worked on it please send me that source code or send me how can i
> solve this. For me it is very important to solve the problem.
>
> please help
> reagrds
> ashwin
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Tue, 02 Feb 2010 18:22:08 -0700
> From: Tim Schaub <tsch...@opengeo.org>
> Subject: [OpenLayers-Dev] preserving scale on base layer switching
> To: OpenLayers Dev <dev@openlayers.org>
> Message-ID: <4b68cfc0.3000...@opengeo.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hey-
>
> Currently, when a new base layer is set, we determine the new resolution
> based on the previous map extent. An alternative would be to determine
> the new resolution based on the previous scale. Preserving center and
> scale makes better sense to me. I'm curious what others think.
>
> The resolution based on extent method breaks down when extents are not
> well defined. E.g. with an extent that wraps the date line. To see
> this break-down in action, follow these steps:
>
> 1) open http://openlayers.org/dev/examples/google.html
> 2) click to zoom all the way out (you'll see multiple worlds)
> 3) open the switcher and change base layers
>
> You should see the scale change.
>
> Apply the patch for http://trac.openlayers.org/ticket/2457 and you
> should see better behavior.
>
> Thanks for any feedback.
> Tim
>
> --
> Tim Schaub
> OpenGeo - http://opengeo.org
> Expert service straight from the developers.
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 02 Feb 2010 18:29:21 -0700
> From: Tim Schaub <tsch...@opengeo.org>
> Subject: Re: [OpenLayers-Dev] Save drawn polygon
> To: dev@openlayers.org
> Message-ID: <4b68d171.2020...@opengeo.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Alex G. wrote:
>
>> Thanks for the link!
>>
>> I am not sure how I can get the info I get on hover after the user finishes
>> drawing a polygon. Another thought would be to "get" all the drawn shapes
>> from the vector layer. After going through the layer functions I wasn't able
>> to find any such function. Does one exist?
>>
>>
>
> Assuming you have a vector layer, you can create a listener to respond
> when features are added to the layer (by a draw control for example):
>
> layer.events.on({
> featuresadded: function(event) {
> console.log("newly added features: " + event.features);
> }
> });
>
> At any time, you can get all the features on the layer:
>
> // all features on the layer
> console.log(layer.features);
>
> And if you want to serialize the features, you'll use one of the
> available formats. E.g.
>
> var format = new OpenLayers.Format.GeoJSON();
> var str = format.write(layer.features);
>
> More information on vector layer events:
> http://dev.openlayers.org/apidocs/files/OpenLayers/Layer/Vector-js.html#OpenLayers.Layer.Vector.EVENT_TYPES
>
> Tim
>
>
>> Thanks in advance for any help!
>>
>> On Mon, Feb 1, 2010 at 5:14 PM, Bart van den Eijnden <bart...@osgis.nl>wrote:
>>
>>
>>> See:
>>>
>>>
>>> http://dev.openlayers.org/releases/OpenLayers-2.8/examples/vector-formats.html
>>>
>>> Best regards,
>>> Bart
>>>
>>> On Feb 1, 2010, at 4:10 PM, Alex G. wrote:
>>>
>>> Hello,
>>>
>>> I am using the drawing example (
>>> http://openlayers.org/dev/examples/editingtoolbar.html) on OpenLayers to
>>> allow users to draw lines and polygons on my map.
>>>
>>> I was wondering how may I "save" the polygons that they have drawn. Is
>>> there some way to get the coordinates they have clicked and then save them
>>> to some database or external file? Is there some built-in function to return
>>> the coordinates clicked or something similar?
>>>
>>> Do I have to "record" the clicks that the user makes and save them? If yes,
>>> how could I go about doing that?
>>>
>>> Thanks in advance,
>>>
>>> Alex
>>> _______________________________________________
>>> Dev mailing list
>>> Dev@openlayers.org
>>> http://openlayers.org/mailman/listinfo/dev
>>>
>>>
>>>
>>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> Dev mailing list
>> Dev@openlayers.org
>> http://openlayers.org/mailman/listinfo/dev
>>
>
>
> --
> Tim Schaub
> OpenGeo - http://opengeo.org
> Expert service straight from the developers.
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 03 Feb 2010 06:58:16 +0100
> From: Andreas Hocevar <ahoce...@opengeo.org>
> Subject: Re: [OpenLayers-Dev] preserving scale on base layer switching
> To: Tim Schaub <tsch...@opengeo.org>
> Cc: OpenLayers Dev <dev@openlayers.org>
> Message-ID: <4b691078.6080...@opengeo.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Tim Schaub wrote:
>
>> Currently, when a new base layer is set, we determine the new resolution
>> based on the previous map extent. An alternative would be to determine
>> the new resolution based on the previous scale. Preserving center and
>> scale makes better sense to me. I'm curious what others think.
>>
>>
>
> I totally agree. This should also improve behavior when switching
> between base layers with different projections/units.
>
> -Andreas.
>
>
>> The resolution based on extent method breaks down when extents are not
>> well defined. E.g. with an extent that wraps the date line. To see
>> this break-down in action, follow these steps:
>>
>> 1) open http://openlayers.org/dev/examples/google.html
>> 2) click to zoom all the way out (you'll see multiple worlds)
>> 3) open the switcher and change base layers
>>
>> You should see the scale change.
>>
>> Apply the patch for http://trac.openlayers.org/ticket/2457 and you
>> should see better behavior.
>>
>> Thanks for any feedback.
>> Tim
>>
>>
>>
>
>
> --
> Andreas Hocevar
> OpenGeo - http://opengeo.org/
> Expert service straight from the developers.
>
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 3 Feb 2010 00:43:25 -0800 (PST)
> From: TonnyCZ <to...@tonny.cz>
> Subject: Re: [OpenLayers-Dev] onImageLoadError not triggered on Google
> Chrome for some missing Tilecache tiles...
> To: dev@openlayers.org
> Message-ID: <1265186605657-4506090.p...@n2.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
>
> Hi,
> the same problem is with LoadingPanel
> (http://trac.openlayers.org/wiki/Addins/LoadingPanel). The loading image in
> Google Chrome sometimes appear, sometime not.
> No idea what it causes... :-(
> T.
> --
> View this message in context:
> http://n2.nabble.com/onImageLoadError-not-triggered-on-Google-Chrome-for-some-missing-Tilecache-tiles-tp4486629p4506090.html
> Sent from the OpenLayers Dev mailing list archive at Nabble.com.
>
>
> ------------------------------
>
> Message: 6
> Date: Wed, 03 Feb 2010 10:26:00 +0100
> From: "Steven M. Ottens" <ste...@minst.net>
> Subject: [OpenLayers-Dev] reproject using vector and protocol (WFS) is
> not working
> To: dev@openlayers.org
> Message-ID: <4b694128.9070...@minst.net>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi all,
>
> I'm trying to access a WFS in epsg:30800, while the background layer and
> all other WFS's are in epsg:4258. I've configured all WFS's using Vector
> and protocol.WFS. I've set the projection in the layer definition, and
> the WFS request does contain the correct epsg code, but the coordinates
> are still in 4258. I checked the Vector class and didn't see anything
> related to projection, am I correct in assuming that Vector.js together
> with the WFS protocol doesn't support reprojecting features? If so
> should I create a ticket, since WFS.js does support it
> (http://trac.openlayers.org/ticket/1406)
>
> regards,
> Steven
>
> Configuration of the working WFS:
> var wfs_nl_cp = new OpenLayers.Layer.Vector(
> "The Netherlands: CP",
> {
> strategies: [new OpenLayers.Strategy.BBOX({resFactor: 1})],
> visibility: true,
> projection: new OpenLayers.Projection("EPSG:4258"),
> protocol: new OpenLayers.Protocol.WFS({
> version: "1.1.0",
> srsName: "EPSG:4258",
> extractAttributes:true,
> url:
> "http://esdin.geodan.nl/fgi/Kadaster/deegree-wfs/services";,
> featurePrefix: "CP",
> featureType: "CadastralParcel",
> featureNS:
> "urn:x-inspire:specification:gmlas:CadastralParcels:3.0",
> geometryName: "geometry",
> maxFeatures: "100",
> sortBy: "label", //not supported
> schema:
> "http://esdin.fgi.fi/esdin/Kadaster/deegree-wfs/services?request=DescribeFeatureType&version=1.1.0&service=WFS&typeName=CP:CadastralParcel&namespace=xmlns(xmlns:CP=urn:x-inspire:specification:gmlas:CadastralParcels:3.0)"
> })
> }
> );
> and the not working WFS:
> var wfs_se_gn = new OpenLayers.Layer.Vector(
> "Sweden: GN",
> {
> strategies: [new OpenLayers.Strategy.BBOX({resFactor: 1})],
> visibility: false,
> styleMap: pointStyles,
> projection: new OpenLayers.Projection("EPSG:30800"),
> protocol: new OpenLayers.Protocol.WFS({
> version: "1.1.0",
> srsName: "EPSG:30800",
> extractAttributes:true,
> url: "http://esdin.geodan.nl/fgi/NLSS/geoserver_esdin/wfs";,
> featurePrefix: "esdin",
> featureType: "geographicalNames",
> featureNS: "http://www.metainfo.se/esdin";,
> geometryName: "SHAPE",
> schema:
> "http://esdin.geodan.nl/fgi/NLSS/geoserver_esdin/wfs?&request=DescribeFeatureType&version=1.1.0&typeName=esdin:geographicalNames";
> })
> }
> );
>
> The post request generated with the second layer is:
> |<wfs:GetFeature xmlns:wfs="http://www.opengis.net/wfs"; service="WFS"
> version="1.1.0" xsi:schemaLocation||="http://www.opengis.net/wfs
> http://schemas.opengis.net/wfs/1.1.0/wfs.xsd";
> xmlns:xsi="http://www.w3.org||/2001/XMLSchema-instance">
> <wfs:Query typeName="esdin:geographicalNames" srsName="EPSG:30800"
> xmlns:esdin||="http://www.metainfo.se/esdin";>
> <ogc:Filter xmlns:ogc="http://www.opengis.net/ogc";>
> <ogc:BBOX>
> <ogc:PropertyName||>SHAPE</ogc:PropertyName>
> <gml:Envelope xmlns:gml="http://www.opengis.net/gml"; srsName="EPSG:30800">
> <gml||:lowerCorner>-45.25 16.72265625</gml:lowerCorner>
> <gml:upperCorner>67.25 85.27734375</gml:upperCorner||>
> </gml:Envelope>
> </ogc:BBOX>
> </ogc:Filter>
> </wfs:Query>
> </wfs:GetFeature>|
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> http://openlayers.org/pipermail/dev/attachments/20100203/5eae706a/attachment-0001.htm
>
> ------------------------------
>
> Message: 7
> Date: Wed, 3 Feb 2010 10:35:37 +0100
> From: Bart van den Eijnden <bart...@osgis.nl>
> Subject: Re: [OpenLayers-Dev] reproject using vector and protocol
> (WFS) is not working
> To: "Steven M. Ottens" <ste...@minst.net>
> Cc: dev@openlayers.org
> Message-ID: <6583feea-a9ca-4d14-bed2-39bdf01e3...@osgis.nl>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Steven,
>
> the format reading the features is responsible for reprojection, not the
> layer. Have you tried supplying internalProjection and externalProjection
> through the formatOptions property of the protocol?
>
> Is it not easier to have your WFS reproject the features for you?
>
> Best regards,
> Bart
>
> On Feb 3, 2010, at 10:26 AM, Steven M. Ottens wrote:
>
>
>> Hi all,
>>
>> I'm trying to access a WFS in epsg:30800, while the background layer and all
>> other WFS's are in epsg:4258. I've configured all WFS's using Vector and
>> protocol.WFS. I've set the projection in the layer definition, and the WFS
>> request does contain the correct epsg code, but the coordinates are still in
>> 4258. I checked the Vector class and didn't see anything related to
>> projection, am I correct in assuming that Vector.js together with the WFS
>> protocol doesn't support reprojecting features? If so should I create a
>> ticket, since WFS.js does support it (http://trac.openlayers.org/ticket/1406)
>>
>> regards,
>> Steven
>>
>> Configuration of the working WFS:
>> var wfs_nl_cp = new OpenLayers.Layer.Vector(
>> "The Netherlands: CP",
>> {
>> strategies: [new OpenLayers.Strategy.BBOX({resFactor: 1})],
>> visibility: true,
>> projection: new OpenLayers.Projection("EPSG:4258"),
>> protocol: new OpenLayers.Protocol.WFS({
>> version: "1.1.0",
>> srsName: "EPSG:4258",
>> extractAttributes:true,
>> url: "http://esdin.geodan.nl/fgi/Kadaster/deegree-wfs/services";,
>> featurePrefix: "CP",
>> featureType: "CadastralParcel",
>> featureNS:
>> "urn:x-inspire:specification:gmlas:CadastralParcels:3.0",
>> geometryName: "geometry",
>> maxFeatures: "100",
>> sortBy: "label", //not supported
>> schema:
>> "http://esdin.fgi.fi/esdin/Kadaster/deegree-wfs/services?request=DescribeFeatureType&version=1.1.0&service=WFS&typeName=CP:CadastralParcel&namespace=xmlns(xmlns:CP=urn:x-inspire:specification:gmlas:CadastralParcels:3.0)"
>> })
>> }
>> );
>> and the not working WFS:
>> var wfs_se_gn = new OpenLayers.Layer.Vector(
>> "Sweden: GN",
>> {
>> strategies: [new OpenLayers.Strategy.BBOX({resFactor: 1})],
>> visibility: false,
>> styleMap: pointStyles,
>> projection: new OpenLayers.Projection("EPSG:30800"),
>> protocol: new OpenLayers.Protocol.WFS({
>> version: "1.1.0",
>> srsName: "EPSG:30800",
>> extractAttributes:true,
>> url: "http://esdin.geodan.nl/fgi/NLSS/geoserver_esdin/wfs";,
>> featurePrefix: "esdin",
>> featureType: "geographicalNames",
>> featureNS: "http://www.metainfo.se/esdin";,
>> geometryName: "SHAPE",
>> schema:
>> "http://esdin.geodan.nl/fgi/NLSS/geoserver_esdin/wfs?&request=DescribeFeatureType&version=1.1.0&typeName=esdin:geographicalNames";
>> })
>> }
>> );
>>
>> The post request generated with the second layer is:
>> <wfs:GetFeature xmlns:wfs="http://www.opengis.net/wfs"; service="WFS"
>> version="1.1.0" xsi:schemaLocation="http://www.opengis.net/wfs
>> http://schemas.opengis.net/wfs/1.1.0/wfs.xsd";
>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
>> <wfs:Query typeName="esdin:geographicalNames" srsName="EPSG:30800"
>> xmlns:esdin="http://www.metainfo.se/esdin";>
>> <ogc:Filter xmlns:ogc="http://www.opengis.net/ogc";>
>> <ogc:BBOX>
>> <ogc:PropertyName>SHAPE</ogc:PropertyName>
>> <gml:Envelope xmlns:gml="http://www.opengis.net/gml"; srsName="EPSG:30800">
>> <gml:lowerCorner>-45.25 16.72265625</gml:lowerCorner>
>> <gml:upperCorner>67.25 85.27734375</gml:upperCorner>
>> </gml:Envelope>
>> </ogc:BBOX>
>> </ogc:Filter>
>> </wfs:Query>
>> </wfs:GetFeature>
>>
>> _______________________________________________
>> Dev mailing list
>> Dev@openlayers.org
>> http://openlayers.org/mailman/listinfo/dev
>>
>
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>
> _______________________________________________
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> http://openlayers.org/mailman/listinfo/dev
>
>
> End of Dev Digest, Vol 41, Issue 3
> **********************************
>
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