问题
I am new to this domain of GeoInformation development. I am following the below pipeline architecture flow to achieve a GIS-based application problem.
PostGIS - GeoServer - Leaflet
I have set up my leaflet client application which composes tiles to a map. I am also using some leaflet plugins (like Draw, zoom) in order to give users the option to mark and to draw on the map.
I am able to draw and get the GeoJSON features of the drawn polygon as shown below:
I am stuck after this part of figuring how do I need to send the polygon request drawn and retrieve the polygon (which is saved) programmatically. I know the answer is WFS-T, but how do I use this in my raw code. Here is the raw code example:
Raw Code link: https://pastebin.com/wCAHxVc0Follow the link
References:
https://gis.stackexchange.com/questions/266402/save-leaflet-drawn-features-with-attributes-to-postgis
https://github.com/Flexberry/Leaflet-WFST
回答1:
The best way to understand WFS-T is using GeoServer Demo option (Link: http://localhost:8080/geoserver/web/wicket/bookmarkable/org.geoserver.web.demo.DemoRequestsPage?5). The main problem for me was to figure out how do I insert and update transaction details. Exploring GeoServer Demo gave me the solution to it.
Here is a sample example:
var postdata = "<wfs:Transaction service="WFS" version="1.0.0" xmlns:wfs="http://www.opengis.net/wfs" xmlns:topp="http://www.openplans.org/topp" xmlns:gml="http://www.opengis.net/gml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.0.0/WFS-transaction.xsd http://www.openplans.org/topp http://localhost:8080/geoserver/wfs/DescribeFeatureType?typename=topp:tasmania_roads"> <wfs:Insert>
<topp:tasmania_roads>
<topp:the_geom>
<gml:MultiLineString srsName="http://www.opengis.net/gml/srs/epsg.xml#4326">
<gml:lineStringMember>
<gml:LineString>
<gml:coordinates decimal="." cs="," ts=" ">
494475.71056415,5433016.8189323 494982.70115662,5435041.95096618
</gml:coordinates>
</gml:LineString>
</gml:lineStringMember>
</gml:MultiLineString>
</topp:the_geom>
<topp:TYPE>alley</topp:TYPE>
</topp:tasmania_roads> </wfs:Insert> </wfs:Transaction>"
This XML request can later be used to send to GeoServer for manipulation using AJAX call as shown below:
$.ajax({
type: "POST",
url: gs.wfs,
dataType: "xml",
contentType: "text/xml",
data: postdata,
//TODO: Error handling
success: function(xml) {
//TODO: User feedback
console.log("Successfully inserted");
}
});
For better understanding with an application scenario of WFS-T, try following this URL: https://georepublic.info/en/blog/2012/leaflet-example-with-wfs-t/. This should help you get started with WFS-T. Happy map editing :)
来源:https://stackoverflow.com/questions/51824271/what-have-i-done-wrong-when-implementing-leaflet-draw-how-to-use-wfst-in-this-s