Geography Markup Language (GML) is an OGC Standard for expressing geographical features.
12
votes
6answers
988 views
What's an efficient way of detecting road junctions on a map?
I may receive maps from any source for my project, and for the C++ algorithm I'm making, it's imperative for the algorithm to know where road junctions (nodes where more than two road segments meet) ...
10
votes
3answers
237 views
What does it mean “GML is an XML grammar”?
I'm trying to get my head around the theoretical side of XML and GML. The OGC web page for GML states that:
The Geography Markup Language (GML) is an XML grammar for expressing
geographical ...
9
votes
2answers
582 views
Storing GML surface in PostGIS
I'm using PostGIS 2.0.0 and would like to store a GML Surface in a way that allows calculating intersections between that surface and various points and lines. In my case, the Surface will have one ...
7
votes
3answers
2k views
How to import/export geographic information (gml or csv file) to geodatabase?
I am searching for C#/Java libraries that can import and export geographic information (gml/csv file formats) from and to geodatabases.
If not yet available, is there other way to do this task?
Any ...
7
votes
3answers
2k views
How to write GML with Geotools?
I'd like to write GML using Geotools. Unfortunately, I can't find documentation on a GML Writer (except for this one from 2006: http://docs.codehaus.org/display/GEOTOOLS/WFS+++GML+DataStore).
Could ...
7
votes
2answers
2k views
How to convert GML Surface to SHP Using OGR?
I have a very large .gml file with multiple layers in it. I would like to export one of these layers to .shp. It is a polygon layer (of lakes). However, I am getting the error:
ERROR 1: ...
7
votes
3answers
535 views
Tutorials for UML/GML
Do you know any good tutorials or any resources for learning from the beginning UML and GML ? I am asking because (later) i would like to learn how to make a application schemas in context of ...
7
votes
1answer
696 views
Why does one part of GML -> KML conversion not work on Google Maps?
Brand new to all of this, not even sure this is the right forum to ask in...
I have a client who wants to visualise cancer incidence and mortality rates by local/unitary authority across Great ...
6
votes
5answers
351 views
GML, KML, GeoJSON - Speed rendering 3109 polygons?
I am working with Geoserver, serving U.S. Lower 48 counties to openlayers (3109 polygons - lots more vertices). The counties are loaded into a postgis database. I am curious about developer ...
5
votes
2answers
1k views
Why can't I edit KML/GML layers?
Newbie here confused by my first experience in QGIS
I have a handful of lines defining a bike route.
Originally they were saved in a .gml file and later translated into .kml so they could be viewed ...
5
votes
1answer
281 views
Experience with Geoserver's GML Extension
I'd like to know if Geoserver's GML extension works (well) with GeoServer 2.1-RC2 and whether it will enable uploading of GML files via REST API.
5
votes
1answer
192 views
How to convert WFS request to GML
I have the following:
var popProto = new OpenLayers.Protocol.WFS({
url: WFS_HOST,
version: "1.1.0",
featureType: layerName,
featureNS: namespace,
srsName: "EPSG:4326",
...
4
votes
4answers
227 views
Looking for web and desktop tools with GML support
I am a graduate student and a novice in GIS field. I have few GML files that contain vector polygon data and I want to see them in a map format. The problem is that I do not have access to ...
4
votes
6answers
1k views
How to get OS Mastermap data into QGIS?
I have been tasked with getting OS Mastermap topography data into QGIS system to compliment our other map layers. The data comes in .gz format. Which I am told needs to be decompressed before I can do ...
4
votes
0answers
196 views
Can GeoTools parse GML CRS definitions?
A kind of branching of this question.
Soon I will need to handle GML Coordinate Reference Sysyem definitions in a Java servlet. Links:
GML OGC reference.
Concrete example.
I know that GeoTools ...
3
votes
1answer
344 views
Is there an XML equivalent to GeoJSON?
In my web application, I am retrieving geospatial data from a server backend (Java) to the browser frontend (JavaScript). I am considering two options of how to serialize the data in this ...
3
votes
2answers
2k views
How do I convert GML to ESRI featureclasses?
I have a series of xml files containing gml tags such as :
<gml:posList srsDimension="2">454780.3125 525867.9375 454762.0625 525994.5625
and I need to convert these into esri featureclasses.
...
3
votes
1answer
228 views
Why are the polygons in my GML not rendered?
I tried to view GML files from download services ( http://services.cuzk.cz/gml/inspire/cp/epsg-5514/ ) and I have a problem with viewing of polygons from layer "CP:CadastralParcel". This Layer ...
3
votes
1answer
234 views
Python: shp file to GML using OGR
I am trying to convert a shapefile to GML 3.1.1 . I am using gdal 1.9.1 however the GML conversion it generates for a geometry feature is GML 2 and it also swaps the long/latitude coordinates. Are ...
3
votes
1answer
157 views
How to show one to many relationships in GML from GeoServer/Postgis?
I am just figuring out how to use GeoServer and Postgis. I am using the States.shp example that came with GeoServer, and I have uploaded that into a table into the Postgis database. I have created a ...
3
votes
1answer
240 views
Polygon Shared Boundaries in GML
Last week I was told on a phone conference that GML supports shared boundaries in Polygon's. I have been unable to find any documenatation to substantiate the claim. Here is the situation:
I have a ...
3
votes
1answer
418 views
Is there a Java library to load data from a WFS server?
I am writing a java client to display remote GIS data. I want to load data provided in GML by a WFS server. Do you know a java library I could use for that?
3
votes
1answer
1k views
OpenLayers.Format.GML.parseFeature() with GML v3 data
I have a partial GML object with the geometry type polygon. The GML version must be 3+ since the coordinates are wrapped in the gml:posList tag:
<gml:Polygon srsName="EPSG:25832" ...
3
votes
1answer
70 views
How can I get KML into JTS TestBuilder?
JTS Topology Suite TestBuilder supports WKT, WKB and GML inputs. What's a quick and easy way to get the geometry for a KML feature into one of these formats for input into JTS TestBuilder?
For ...
3
votes
1answer
200 views
OSS java approach to convert Shapefile to GML
We've got a project coming up where we need to upload .zip of a shapefile, join the .dbf to some lookup tables, join to other tables also uploaded (one to many attributes for each feature), and ...
3
votes
1answer
100 views
how to add GML files in geoserver 2.2.2
How can I add GML files to a GeoServer 2.2.2 instance?
How can edit them "on the fly" and save the results back to the server using OpenLayers?
I would appreciate examples if possible.
sir i m ...
3
votes
0answers
66 views
PostGIS 2.0 st_geomfromgml using LineString fails with invalid GML representation
I am attempting to insert a geometry into a table using the st_geomfromgml function.
The GML is being sourced from a Geoserver WFS request.
The function call looks like this
...
3
votes
1answer
115 views
How to couple GeoTools GML bindings for encoding to GML 3.1.1
I've successfully created GeoTools (8.3) bindings for parsing and encoding XML bindings as described in their tutorial: http://docs.geotools.org/latest/userguide/library/xml/internal/bindings.html
I ...
3
votes
0answers
320 views
Why doesn't the gml 3.1.1 schema validate with xmllint?
Running xmllint on the gml 3.1.1 schema fails, even though the release notes claim that this release was created to get the schema to validate using 'common tools'. There's questions about this on ...
2
votes
1answer
499 views
Convert GML to GeoJSON
I have downloaded a GML file from Statistics Canada and would like to convert it into GeoJSON to use parts of it in a D3 visualization on the web. However, I did not find a converter that would do ...
2
votes
4answers
203 views
What are the advantages either way between GML and ShapeFiles?
After a good start many months ago of getting into GIS through QGIS, I had to drop what I was doing and did not touch it for quite some time. I am now able to get back into it and have a need to load ...
2
votes
3answers
490 views
How do I use ogr2ogr to convert a GML to shapefile in Python
I am trying to convert a GML to an ESRI shapefile using ogr2ogr utility in a python script.
I have successfully installed the GDAL/OGR package via osgeo but I am now struggling to find/understand ...
2
votes
2answers
151 views
Ordnance Survey osgb:BNG spatial reference system not recognized by PostGIS
I'm trying to load an Ordnance Survey GML file into PostGIS using the ST_GeomFromGML function. The problem is that the spatial reference system that is used in the file, osgb:BNG, is not recognized by ...
2
votes
3answers
394 views
How to merge several GML files into one
I have a folder of GML files that I want to be able to merge to create one GML file that I can then view.
I have tried this using the code described but substuting for GML in this website but to no ...
2
votes
1answer
332 views
How to add more than one xml file per layer
I'm using this code to add xml (osm relations) files to my map.
osm_layer = new OpenLayers.Layer.GML("Polygon", relation.xml, {
format: OpenLayers.Format.OSM,
style: {strokeColor: "blue"},
...
2
votes
1answer
549 views
how to download a file from geoserver gml from a url using javascript?
how to download a file from geoserver gml from a url using javascript?
I'm doing a web application with javascript, but I could not download files from geoserver, the url given entry does not bring ...
2
votes
1answer
99 views
How to debug ogr2ogr ERROR 1: Did not get at least 2 values or invalid number of set of coordinates?
I'm trying to convert a government data contour GML (http://geo.data.linz.gv.at/katalog/geodata/hoehenschichten/2011/1m-Hoehenschichten.gml) to Shapefile.
It seems like it was created by FME:
...
2
votes
1answer
249 views
OpenLayers WPS function fails in IE
I am making a WPS call in OpenLayers which works successfully in Chrome and Firefox but not in IE9. The response from IE tells me
"Process failed during execution\nCould not convert to target type ...
2
votes
4answers
518 views
How do algorithms load pieces of maps?
If the user moves the mouse pointer to the top left corner of the screen, I want my software to auto-load the three tiles that are closest to the mouse pointer. My assumptions are that the smaller are ...
2
votes
1answer
223 views
Rendering GML in QGIS 1.9.0
I have a set of GML geometries (see here), which I try to load in QGIS. The set contains both points and polygons, but when loaded into QGIS, only points are shown. I tried to follow this thread, but ...
2
votes
1answer
252 views
GML and GeoJSON vector layer can not display in Firefox and Chrome
I have following codes. It works perfectly in IE (GML and GeoJSON vector layer was loaded), but not in Firefox and Chrome without any errors noticed. Please help me to fix this problem.
Here is the ...
2
votes
1answer
114 views
Service URL for Web Feature Service (WFS) using GML Simple Features profile?
Does anyone know of an "almost always available" Service URL for a Web Feature Service (WFS) using GML Simple Features profile?
I'm keen to test WFS client capabilities without having to configure a ...
2
votes
0answers
117 views
What is the best way to convert WKT String to GML String
What is the best way to programatically convert WKT String to GML String? Every reasonable library (at best available in some Maven repository) can be used.
Till now I came up with this solution ...
2
votes
0answers
83 views
How to write GML parser with Geotools?
I wrote a Parser for a GML file from the OS Mastermap with geotools 8.4. With one part I still have a problem. This sniplet of the xsd:
<complexType name="RoadLinkType">
...
2
votes
0answers
225 views
PostGIS: ST_Transform function conversion problem
I'm inserting map data from a GML file with srid EPSG:27700 into a PostGIS database table with srid EPSG:4326. I'm using the ST_Transform function as in this snippet:
...
2
votes
1answer
480 views
What does “Error when writing Schema: A unique destination featuretype name could not be generated for” mean?
I have a bunch of GML datasets which I need to import to Esri featureclasses. I am using the Data Interoperability extension for ArcGIS, which should support this. However when trying to import my ...
1
vote
1answer
194 views
Converting a shp file to a list of latitudes and longitudes
I have a shp file with the latitudes and longitudes for the boundaries for various geographic regions. I'd like to convert the shp file into lists of just latitudes and longitudes for the regions. ...
1
vote
3answers
209 views
How can I translate a GML definition of SRS to a usual format (e.g. WKT or PROJ.4)?
From GDAL 1.9.0 a new utility is available: gdalsrsinfo.
Although it can yield an XML (GML-based) definition from a source equivalent format or file, it seems that it can only read usual GDAL/OGR ...
1
vote
3answers
142 views
Looking for large GML files containing vector polygon data
I have few vector data files with 500 to 700 MB GML files. But I am looking for files larger than these preferably 1 GB, 2 GB. It would be helpful if somebody can provide some pointers regarding the ...
1
vote
1answer
126 views
How can I import geometries from an invalid GML quickly?
I have the following gml geometry :
<gml:Polygon xmlns:gml="http://www.opengis.net/gml" srsName="EPSG:2154">
<gml:exterior>
<gml:LinearRing>
<gml:posList ...
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