Questions tagged [gml]
Geography Markup Language (GML) is an OGC Standard for expressing geographical features.
277
questions
1
vote
1answer
62 views
Reconstruct full coordinate reference system stored in a GML file
I have been able to parse a GML file and fetch the polygons I wanted. They can be plotted ok when plotted on their own. I have them stored in a
GeoPandas data frame, but I am struggling to set the ...
0
votes
0answers
181 views
Extract one geometry type from GML file in GeoPandas
I try to use GML data from Landesvermessung Brandenburg in GeoPandas. It generally works to load files like this:
df = gpd.read_file(r'/vsizip//vsicurl/https://data.geobasis-bb.de/geobasis/daten/...
0
votes
1answer
36 views
How to extract coordinate from GML File in Java using geotools with STAX
I would like to extract all coordinates from my GML file and convert them in geometry type:
<geometrie>
<gml:MultiCurve srsName="EPSG:3944" srsDimension="3"...
1
vote
2answers
77 views
Show GML on map (using an example GML file)
How can I show features (from an example file)? I tried many, many ways. This is a different route using a standard GML example file from OpenLayers.
Problem : With the shown code example, I don't see ...
2
votes
1answer
41 views
Reading feature from a GML3 content-string
How can I show the geometries from a GML3 file? Nothing is shown.
This question is DIFFERENT from Show GML on map (using an example GML file).
The other project was to get a strange GML2 file visible ...
0
votes
0answers
14 views
How to add GML data on arcgis javascript map application?
I am using a wfs service using ajax query. So it returns me a xml based response (GML2 format) like following. (But does not return a json.)
<wfs:FeatureCollection xmlns:xs="http://www.w3.org/...
1
vote
1answer
46 views
Validating schema of my XSD wth GML with GeoTools
I would like to control if my GML file is valid with my actual XSD using GeoTools.
I found something here: GML2 Parsing TestSchema Example. But I don't know if it's a good way to do what I want.
...
0
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0answers
24 views
Access Z values of GML features in QGIS
I want to extract the Z values of polygons from a GML file with a python script. I can't use the field calculator, since you can't edit GML files in QGIS. Ideally, I want to extract the Z values from ...
1
vote
1answer
34 views
GeoTools and JTS dependency match
I currently use outdated versions of JTS and GeoTools in my Java application. GeoTools is used for parsing GML structures into JTS Geometry objects. However, I do not know how to update the libraries ...
0
votes
0answers
175 views
Convert cityGML to SHP?
I want to convert cityGML files into shapefiles which show the 3D-objects from above in 2D. It would be also nice to keep the height of the objects in the attribute table or as z-value. I want to use ...
0
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0answers
154 views
How to correctly assign (apply) XSD schema to GML using ogr2ogr?
My task is to convert data from ESRI fileGDB to single GML, applying certain XSD schema (a kind of state standard). So, I used OSGeo4W Shell to write the following command:
ogr2ogr -f "GML" -oo ...
0
votes
0answers
33 views
Reading features from GML OL3
I am trying to read features with ol.format.GML (using OL3).
As a result I get feature but not it's geometry.
GML file looks like this:
var gmlString = '<?xml version="1.0" encoding="utf-8" ?>
&...
0
votes
0answers
42 views
OpenLayer Impossible to load GML file with ESPG:3947
I try to load my gml file with this code but it doesn't work. Did I forgot something ?
import Map from 'ol/Map'
import Layer_Tile from 'ol/layer/Tile'
import source_OSM from 'ol/source/OSM'
import ...
0
votes
0answers
42 views
Impossible to display my GML file
I would like to display my GML file but I don't understand why nothing appear in the map:
code:
import Map from 'ol/Map'
import Layer_Tile from 'ol/layer/Tile'
import source_OSM from 'ol/source/...
0
votes
0answers
198 views
Convert list of GML coordinates into WKT
I am working with a NetCDF file. One of the attributes of the file is its footprint given as just a list of GML coordinates e.g.
#ncds is a netCDF dataset
>>> ncds['METADATA/EOP_METADATA/om:...
1
vote
0answers
33 views
GML file provides wrong coordinate system
I have the following field 51A.
It is described by the following GML excerpt:
<gml:featureMember>
<ogr:av_export_temp.ihkulroo fid="av_export_temp.ihkulroo.183">
<ogr:...
0
votes
0answers
30 views
Why a rectangle area is described as a 13-point polygon in a GML file?
I have the following field called 51A:
I have the following excerpt from the GML file where it describes the 51A field:
<gml:featureMember>
<ogr:av_export_temp.ihkulroo fid="...
0
votes
0answers
15 views
posList conversion to area in square meters
I have the following GML where I would like to place these coordinates on a map and calculate the square meters of the polygon.
I am completely at loss here as I do not know where to begin. Any ...
0
votes
0answers
39 views
How do I join an area that has been split into many .dwg or .gml files?
How do I merge a bunch of adjacent (1) dwg or (2) gml files into a continuous map using free software or online? Thanks.
0
votes
1answer
113 views
How to use GDAL /vsizip/ to access GML file(s) from Sentinel-2 zip package
Which is the correct way to write the path through the *.Zip S2 imagery package to rich the *.GML vector file(s) ?
Does someone knows how to correctly write the path to *.GML file for using it with /...
0
votes
0answers
88 views
Making map with Python from FGDB or GML or GPX or PostGIS or SOSI and TIFF files
I am a complete beginner in GIS domain and I would say intermediate level with Python. I would like to use Python to plot a simple map displaying the hiking trails of Norway to prepare my future ...
0
votes
1answer
67 views
GeoServer Application Schema GML output without geometry
I am working on an Application Schema example. The dataset is being built, the layer will be rendered as WMS, but the WFS-GML Output produces an empty tag where a Point geometry would be expected.
I ...
2
votes
1answer
563 views
Read GML using Java
I have a use case on reading and extracting data from GML (Geography Markup Language) using Java. There is a sample file in GitHub by clicking here.
The imported packages in Java were as follows
...
1
vote
1answer
60 views
prevent ogr2ogr from generating new fid attribute field
I am exporting data from PostGIS to gml using python script with ogr2ogr. But the output generates unwanted new field "fid" that contains the following string: "sql_statement.0" , "sql_statement.1", ....
1
vote
1answer
61 views
GeoTools GML parser sorted features collection
I am using the following code to parse GML file in java:
File gmlFile = new File("path/to/gml/file");
InputStream gmlInStream = new FileInputStream(gmlFile);
GML gml = new GML(Version.WFS1_0);
...
0
votes
0answers
40 views
WFS 2.0 with get request outputformat gml3 returns body using wfs 1.1.0 schema, is this expected?
I am making GET requests against a wfs service specifying version 2.0, when I do not specify an outputformat in the request it returns a body using the schema namespace for wfs 2.0 (wfs:), when I ...
2
votes
2answers
46 views
Feature becomes invalid when reading through WFS/GML in GeoServer [duplicate]
I'm working with the TIGER shapefiles, specifically the Tract layer, and my I'm trying to read selected features via WFS using GeoServer, then save those to a new layer. However, when the shapes come ...
1
vote
1answer
140 views
Display the gml:id of WFS layer as an attribute in QGIS
I have loaded a WFS layer in QGIS and want to display the gml:id of the features in the attribute table. Is this somehow possible?
I can see the gml:ids in other applications (ex FME).
0
votes
1answer
269 views
OGR2OGR - converting a GML file to GeoJSON
I'm struggling to use ogr2ogr to convert a GML file into a GeoJSON file. My input is zipped GML files with several layers. I'm only interested in the layer with name 'TopographicArea'.
I've tried ...
1
vote
0answers
46 views
How to show Turn Restriction data from OS MasterMap Highways on the map?
I want to obtain the location and details of all turn restrictions from the OS MasterMap Highway Network datasets I have.
I tried loading the Turn Restriction dataset into QGIS but it does not read ...
0
votes
0answers
35 views
Encoding non-mandatory feature properties in WFS/GML?
In what ways can non-mandatory feature properties be encoded in feature type schema (WFS 2.0/GML 3.2.1 with GML features)?
3
votes
1answer
73 views
Understanding GML structure for validation
I'm failing to convert this GML v3.2 XML and I'm not sure why:
<?xml version="1.0" encoding="UTF-8"?>
<gml:MultiGeometry xmlns:gml="http://www.opengis.net/gml" srsName="">
<gml:...
2
votes
0answers
53 views
Topology Error building polygon
I retrieve a response from the wfs_gnde from BKG in Germany using the following URL and request.
http : // sg.geodatenzentrum.de / wfs_gnde
<GetFeature
version='1.1.0'
service='WFS'
...
4
votes
3answers
381 views
Trying to import Dutch Infrastructure GML using OGR GMLAS driver, but no geometries?
I have some Dutch Infrastructure GML files that I'm trying to display in GeoServer. Step 1 is to import the GML into PostGIS and while I can make it work using the OGR GML driver, I end up with a ...
1
vote
0answers
310 views
GML file converted to ESRI shapefile with ogr2ogr missing spatial reference information
I am trying to convert Sentinel-2 cloud masks from GML format to ESRI shapefiles. I have managed to use ogr2ogr in a python script as described in the answer to Using ogr2ogr to convert GML to ...
1
vote
1answer
52 views
Changing name of file download from browser app?
I am developing browser application using MapServer and JavaScript. I've got part where on map click I get FeatureInfo about an object:
function getFeatureInfoGML(map){
var openwindowhandle=...
0
votes
0answers
97 views
How do I search for features within another feature using WFS OGC
I understand I can write a GML query like this...
<wfs:GetFeature xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/wfs http://giswebservices....
3
votes
3answers
284 views
GML validation errors with FME
I am wondering if I am missing something.
I am exporting some records from an Oracle dB to a GML2 file using FME.
When I validate the resulting XML using online validators I don't find any errors.
...
2
votes
1answer
99 views
gdalwarp - correct for a slight spatial misregistration?
Some Sentinel-2B band images have slight spatial misalignments as I explained on the step forum.
https://forum.step.esa.int/t/sentinel-2-tci-10m-level-2-images-slight-spatial-misregistrations/14235
...
1
vote
1answer
95 views
How can I determine the original spatial reference system of GML coordinates when I have their WGS84 equivalent but no EPSG?
I am querying out spatial information from a SQL database that stores locations that users input on a map as GML snippets. See below for an example:
<gml:Point xmlns:gml="http://www.opengis.net/...
1
vote
0answers
96 views
No geometry when importing 3D building model GML into PostGIS
I'm attempting to import a GML file containing 3D building models into PostGIS using ogr2ogr.
ogr2ogr -f PostgreSQL PG:"host=${hostname} port=${port} dbname=${db} \
user=${user} password=${...
2
votes
2answers
2k views
Open with QGIS a GML file (INSPIRE schema) created with HALE studio
I'm trying to export in GML the transformed data of "Basic hydrography example" of hale studio and to add the file in QGIS, using the plugin GML application schema toolbox. The GML exported should be ...
2
votes
1answer
5k views
What is a GML file?
I am writing some training notes for new QGIS users at my work.
I have a section on types of vector files; ESRI Shapefile, MapInfo Tab and GML & GZ so far.
We sometimes use the UK Land Registry ...
0
votes
1answer
65 views
Seeking Open source Tools for GML in ArcGIS and gvSIG?
Iām searching open source tools for ArcGIS Desktop 10.5 and gvSIG 2.4 to load and write complex GML data for example INSPIRE GML.
I have not the possibility to install interoperability or INSPIRE ...
0
votes
1answer
382 views
Openlayers - parse WFS features to create Attribute Table
I am trying to parse this WFS to create an Attribute Table with HTML having the fields as headers and their values as attributes.
I saved the GetFeature response in a variable (features) which I'd ...
3
votes
1answer
995 views
Using ogr2ogr to convert multiple GML files to a postgis table
I have a folder with 150 .gml (addressbase) files I need to upload to my postGIS/postgres database. After the first gml is uploaded, the rest will be appended to it to form a single table. However I ...
1
vote
0answers
828 views
Reading data to geopandas using WFS - GML format
This relates to the question here:
Reading data to geopandas using WFS?
Is there a way to to do the same with a service that does not supply the data in GeoJSON format, but in GML-format?
The ...
0
votes
1answer
375 views
Edit and transform XML/GML files
I'm searching for an approach as someone who just started to work with geodata recently.
It's about the following situation: I received several XML files. I need to perform a geometric difference ...
0
votes
1answer
160 views
Batch convertion of .tab files to a single .gml using ogr2ogr
My task is to convert .tab files from a directory (C:\Users\Vadim\Downloads\vec\MapInfo\snp) to a single GML file (snp.gml).
I use OSGeo4w Shell.
So I wrote a following command:
ogr2ogr -f "GML" C:\...
0
votes
1answer
639 views
GML axis order problem in QGIS
Is there any reason why QGIS swap axis order if CRS (EPSG:3908) is defined inside GML, for example:
<au:geometry>
<gml:MultiSurface gml:id="_42d05737-123d-4a52-a655-aef968cd9511" srsName=...
