1
ile bir şekle dönüştürülür XML kullanarak XML/GML'deki Web Feature Service katmanlarını R kullanarak bir şekil dosyasına dönüştürmeye çalışıyorum, tam orada değilim ve herhangi bir yardımı takdir ediyorum.Web Özellik Hizmetini Dönüştürme Coğrafi İşaretleme Dili verileri R
WFS link: 'http://sdi.fish.govt.nz/sdi/mapserver.wfs?SERVICE=WFS&REQUEST=GetFeature&TYPENAME=Annual%20distribution%20of%20Albacore%20tuna&VERSION=1.1.0' İşte
bugüne kadar XML kütüphanesi kullanarak iş akışının bir örnektir
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>
Şu an tek istediğim (sadece çıkış bu bağlantıdan tabakaların biri) Bu çıktıyı bir şekle dönüştürmek için, bir GML sürücüsüne sahip olan ogr2ogr'u kullanmalıyım, belki de yukarıdaki XML'u atlıyor olabilir. bunu yazmak, Oradan
gml = substr(albacore,4,nchar(albacore))
: Herhangi bir yardım çok
library(rgdal)
library(gdalUtils)
ogr2ogr()
readOGR()