[Featureserver] How to save polylines/linestrings from OL?

[Christopher Schmidt]

On Tue, Oct 14, 2008 at 02:04:49AM +0200, Frederik Ramm wrote:
> Hi,
> 
>     I've been using OpenLayers for a while and am now starting to play 
> with FeatureServer.
> 
> I have two layers in OpenLayers, each with one Polyline on it. I want
> to save this full picture to FeatureServer. I generate an array 
> containing the two polylines from the two layers:
> 
> var feature_array = new Array();
> feature_array.push(first_layer.features[0]);
> feature_array.push(second_layer.features[0]);
> 
> and let this run through OpenLayer's GeoJSON formatter, yielding:
> 
> {"type":"FeatureCollection","features":[{"type":"Feature","id":"OpenLayers.Feature.Vector_429","properties":{},"geometry":{"type":"LineString","coordinates":[[946549.6300834444,6275193.970668824],[946534.0453547356,6275193.970668824],[946531.8189649201,6275173.60840275],[946371.5188982,6275046.345351336],[946337.009856059,6275002.227940855],[946163.3514504456,6274818.973470214],[946072.0694680078,6274812.186343908]]}},{"type":"Feature","id":"OpenLayers.Feature.Vector_456","properties":{},"geometry":{"type":"LineString","coordinates":[[946550.0753614076,6275195.83721234],[946550.6284395837,6275198.850473554],[946545.9565402488,6275200.842944701],[946547.6374645595,6275161.2553185765],[946527.655615965,6275159.100318105],[946502.9315570632,6275149.818550694],[946456.5001974597,6275115.016255822],[946350.2346115634,6274999.156698926],[946289.9328434088,6274939.802198524],[946174.0937813055,6274819.397665788],[946110.8309146966,6274812.932927536],[946072.4274498615,6274811.742776
> 886],[946072.4034264801,6274813.543768735]]}}]}
> 
> If I try to save this to FeatureServer, I get an error message about the 
> geometry type "LineString" that was created by OpenLayers:

You skipped the crucial piece of information: specifically, how are you
trying to 'save this to FeatureServer'?

My guess is that your default service type is not set, so it is
defaulting to "JSON" (old, deprecated, maintained for backwards
compatibility) instead of "GeoJSON" (new hotness, matches OL). You can
control the default service type via your FeatureSErver config:
http://svn.featureserver.org/trunk/featureserver/featureserver.cfg shows
default_service -- or you can simply post to something like
/scribble/create.geojson, which will force into geojson moe.

-- Chris

> Unable to determine bounding box for feature with geometry LineString
> 
> (this is from Feature.py). I then modified Feature.py to also accept 
> LineString instead of Line, but then the same problem occurs again in 
> the storage backends:
> 
> An error occurred: Couldn't create WKT from geometry of type LineString 
> ({u'type': u'LineString', u'coordinates': ... ). Only Point, Line, 
> Polygon are supported.
> 
> (this is from the SQLite backend but I have verified that neither does 
> the PostGIS backend support the a GeoJSON type of "Linestring").
> 
> Somehow this must work - http://featureserver.org/demo.html perfectly
> manages to upload polylines! So where is my mistake? (My FeatureServer 
> installation is a few months old but I have confirmed that current SVN 
> versions don't expect to receive LineString either. I'm using OpenLayers 
> directly from http://openlayers.org/api/OpenLayers.js.)
> 
> Bye
> Frederik
> 
> -- 
> Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"
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-- 
Christopher Schmidt
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