I'm trying to convert Web Feature Service layers that are in XML/GML into a shapefile using R, I'm not quite there and would appreciate any help.
The WFS link is: 'http://sdi.fish.govt.nz/sdi/mapserver.wfs?SERVICE=WFS&REQUEST=GetFeature&TYPENAME=Annual%20distribution%20of%20Albacore%20tuna&VERSION=1.1.0'
Here is an example of my workflow so far using XML library (only output one of the layers from this connection)
library(XML)
library(RCurl)
site <- 'http://sdi.fish.govt.nz/sdi/mapserver.wfs?SERVICE=WFS&REQUEST=GetFeature&TYPENAME=Annual%20distribution%20of%20Albacore%20tuna&VERSION=1.1.0'
albacore <- getURL(site)
albacore_t <- xmlTreeParse(albacore, asText = TRUE)
xmlRoot(albacore_t)
#<?xml version="1.0"?>
#<wfs:FeatureCollection xmlns:gml="http://www.opengis.net/gml" xmlns:fish="http://www.fish.govt.nz/fish" xmlns:gmlsf="http://www.opengis.net/gmlsf" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ogc="http://www.opengis.net/ogc" xmlns:d1p1="http://www.w3.org/2001/XMLSchema-instance" xmlns:wfs="http://www.opengis.net/wfs" d1p1:schemaLocation="http://www.fish.govt.nz/fish http://sdi.fish.govt.nz/sdi/mapserver.wfs?SERVICE=WFS&REQUEST=DescribeFeatureType&TYPENAME=Annual distribution of Albacore tuna&VERSION=1.1.0; http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.1.0/wfs.xsd">
#<gml:featureMember>
#<fish:FD0005_2 gml:id="ID00000">
#<fish:FeatureKey>3986</fish:FeatureKey>
#<fish:LayerKey>6</fish:LayerKey>
#<fish:FeatureGuid>41eb2b37-9e56-4cfa-8a95-7f32f1196de1</fish:FeatureGuid>
#<fish:FeatureType>NOTEXIST</fish:FeatureType>
#<fish:SpeciesCode>ALB</fish:SpeciesCode>
#<fish:GeneralisationYn>Y</fish:GeneralisationYn>
#<fish:Metadata><p1:FD0005_2 xmlns:p1="http://www.safe.com/gml/fme" xmlns:gml="http://www.opengis.net/gml" gml:id="id41eb2b37-9e56-4cfa-8a95-7f32f1196de1"><p1:MFish_ID>1</p1:MFish_ID><p1:Layer_ID>FD0005_1</p1:Layer_ID><p1:Basket_title>Fish distribution</p1:Basket_title><p1:Species_common_name>Albacore Tuna</p1:Species_common_name><p1:Species_scientific_name>Thunnus alalunga (Bonaterre, 1788)</p1:Species_scientific_name><p1:Species_code>ALB</p1:Species_code><p1:Species_maori_name>Unknown</p1:Species_maori_name><p1:Species_group>Albacore Tuna</p1:Species_group><p1:Distribution_class>Not Exist - The species is known not to exist</p1:Distribution_class><p1:Temporal_extent>Annual</p1:Temporal_extent><p1:Object_security>None</p1:Object_security><p1:Object_name /><p1:Object_area>3261385 km2</p1:Object_area><p1:Distribution_class_area>3261385 km2</p1:Distribution_class_area><p1:Positional_accuracy>100 km</p1:Positional_accuracy><p1:Accuracy_explanation>The mapped object is a scientific interpretation of data and is considered accurate to ± 15%</p1:Accuracy_explanation><p1:Habitat_type>Pelagic</p1:Habitat_type><p1:Species_depth_minimum>0 m</p1:Species_depth_minimum><p1:Species_depth_maximum>380 m</p1:Species_depth_maximum><p1:Management>Ministry of Fisheries</p1:Management><p1:Scientific_contact>General Manager, Biodiversity, Biosecurity and Information Systems, NIWA, Private Bag 14901, Wellington. 04 386 0300</p1:Scientific_contact><p1:Object_references /><p1:Endangered_status>Not listed</p1:Endangered_status><p1:Keywords>Not exist</p1:Keywords><p1:Alert>N</p1:Alert><p1:Alert_warning>None</p1:Alert_warning></p1:FD0005_2></fish:Metadata>
#<fish:LayerTitle>Annual distribution of Albacore tuna NOTEXIST</fish:LayerTitle>
#<fish:LayerGroup>FD3776</fish:LayerGroup>
#<fish:LayerName>FD0005_2</fish:LayerName>
#<fish:LayerzOrder>300002</fish:LayerzOrder>
#<fish:FishGeometry>
# <gml:Polygon xmlns="http://www.opengis.net/gml" xmlns:gml="http://www.opengis.net/gml">
# <gml:exterior>
# <gml:LinearRing>
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#</gml:LinearRing>
#</gml:exterior>
#</gml:Polygon>
#</fish:FishGeometry>
#</fish:FD0005_2>
#</gml:featureMember>
#<gml:featureMember>
I now want to convert this output to a shape, I think I should be using ogr2ogr which has a GML driver, maybe even bypassing the XML above. Any help much appreciated
library(rgdal)
library(gdalUtils)
ogr2ogr()
readOGR()
I think you are close... After fetching the GML, I had to clean up the first few non-standard characters:
gml = substr(albacore,4,nchar(albacore))
From there, write it out to disk as a GML file (there might be a fancy trick with textConnection or something similar to avoid writing):
write(gml, "/Users/Benjamin/Desktop/test.gml", sep="")
Then, read a layer from the file:
data = readOGR("/Users/Benjamin/Desktop/test.gml", "FD0002_2")
>>> OGR data source with driver: GML
>>> Source: "/Users/Benjamin/Desktop/test.gml", layer: "FD0002_2"
>>> with 1 features
>>> It has 12 fields
And write the output shapefile:
writeOGR(data, "/Users/Benjamin/Desktop/test.shp", "FD0002_2", driver="ESRI Shapefile")
>>> Warning message:
>>> In writeOGR(data, "/Users/Benjamin/Desktop/test.shp", "FD0002_2", :
>>> Field names abbreviated for ESRI Shapefile driver
You can find the layer names using:
ogrListLayers("/Users/Benjamin/Desktop/test.gml")