The OGR Simple Features Library is a C++ open source library (and command line tools) providing access to vector file formats.

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QGIS crash when I try print geometry

I do (It`s work): from osgeo import ogr inputds = ogr.Open(r'c:\temp.shp') inputlyr = inputds .GetLayer() for i,feature in enumerate(inputlyr): print i, feature.GetGeometryRef() Output: 0 ...
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Gdal+Geos point in polygon test fails under MinGW64

I have to build a grid of points and remove the points that falls inside a polygon. Polygons are defined in a ESRI shapefile, points are in a list. This is how I make the test: OGRLayer *layer = ...
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How to build a geographic database of GPS logs?

On our aerial wildlife surveys we typically generate dozens of GPX files, and usually convert most of them into shapefiles for display in a GIS application. GPX files are a terrific way of keeping all ...
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1answer
25 views

What is a OGRGeometryShadow and why can't I use it in Intersects()-method?

I'm trying to script something with Python and GDAL/OGR and Shapely. What I have: two LineString geometries: "geom1" and "geom2" I made an Intersection: "intersection = geom1.Intersection(geom2)" ...
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What is the input format to the M-GEMMA map matching tool?

I am researching different map matching algorithms. Based on the Map Matching StackExchange discussion I came across the M-GEMMA tool written in C++, which can be downloaded here. A literature discuss ...
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16 views

Python OGR Geometry changes Floating Points

I'm creating a Polygon in OGR and adding coordinates to it in Python. It is a must that my coordinates aren't allowed to change when adding, however they do and I don't understand why. Here is my ...
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1answer
178 views

Using ogr2ogr to download GeoJSON files from ArcGIS MapServer

I am trying to download as a GeoJSON file a line feature from a ArcGIS MapServer REST Service run by the National Park Service (link is here) so that I can open the data in QGIS. Using the guide ...
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1answer
32 views

ogr2ogr convert DXF to GeoJSON with defined geometry

I trie to convert a DXF file into a GeoJSON file with: ogr2ogr -f 'GeoJSON' -sql "SELECT * FROM entities WHERE layer = 'geom_test'" test.json dfxtest.dxf Is it possible to convert only geometries ...
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1answer
382 views

GDAL.RasterizeLayer not ported to the C# bindings?

I am trying to use the OSGeo.GDAL.Gdal.RasterizeLayer(…) from GDAL 1.9.2 and it requires some SWIGTYPE parameters: OSGeo.GDAL.Gdal.RasterizeLayer( OSGeo.GDAL.Dataset dataset, int bands, ...
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2answers
811 views

OSR Python testSR.ImportFromEPSG(4326) returns empty spatial reference

This is empty using Python .ImportFromEPSG(4326): import osr #this fails: testSR = osr.SpatialReference() testSR.ImportFromEPSG(4326) print testSR.ExportToPrettyWkt() #why did the import from EPSG ...
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55 views

building GDAL with libKML support

I'm attempting to import a kml/kmz file generated using Google Tracks into my QGIS 2.4 system (built with GDAL 1.10). KML files currently lose all attributes, and as such I'm attempting to build GDAL ...
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315 views

I need to extract a specific layer from a Geospatial PDF using GDAL/OGR

I have GDAL/OGR 1.10 installed on a 64bit Windows 7 machine. I have some Geospatial PDFs that I want to crop to the outline of the map and convert to Rasters. However I cannot clip to the neatline. ...
2
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1answer
27 views

Partial loss of projection data converting to MapInfo File with OGR

I'm trying to convert some data from ESRI Shapefile to MapInfo TAB format using ogr2ogr. The data is projected using the British National Grid (EPSG:27700). The output file is valid, and the geometry ...
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23 views

What is the area that OGR extracts from the (geometry) shp files for polygons?

The ESRI July 1998 technical documentation for polygon shapefiles at page 10 makes no mention of either area measures or length measures (apart from byte/record-layout matters). Yet OGR enables me to ...
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0answers
38 views

Loading virtual vector layer in QGIS

Can QGIS read layers in OGR's virtual vector format? It seems to work with VRT raster files, but it reports my layer is an invalid data source for vectors. http://www.gdal.org/drv_vrt.html I'm ...
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1answer
105 views

How to get the two nearest points between two polygons

I'm trying to draw the nearest line between the nearest polygons in a Polygon dataset (ESRI Shapefile). I know that for this purpose there is the Near Tool (ArcGIS), but it just return the point TO ...
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40 views

QGIS : cannot change the z-coordinate of a point shapefile using the wkb geometry format

I am using QGIS Desktop 2.5.0-Master with GDAL/OGR 1.11.0 on a windows 7. I am working on a little pyQGis script that should modify the z-coordinate of points in a vector shapefile based on a value ...
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1answer
33 views

Geoprocessing tool Difference from the Terminal?

I have used QGIS Geoprocessing tool Difference to cut polylines (SHP) into to smaller pieces using a polygon (SHP). This works very good in QGIS. Now, to speed up the process, I'd like to be able to ...
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19 views

OGR Virtual Format - How To Do Join

I have to kluge together a bunch of disparate data sources, and think the OGR Virtual Format may be an elegant solution. In looking at the documentation, I can't seem to find a way to join 2 layers ...
2
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1answer
65 views

problem transforming CRS coordinates EPSG:4269 to EPSG:3857 in python

source_srs = get_srs(shp_abs_path) source_epsg = source_srs.GetAttrValue("PROJCS|GEOGCS|AUTHORITY", 1) print source_epsg #prints 4269 target_epsg = 3857 # because these are headed to leafletjs ...
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DeleteFeature work very slowly with a MemoLayer

I have a python custom geoproccess wich use osgeo.ogr with a 'Memory' datasource. It work pretty fast except in one point where I need to delete feature known by id in a list. duplicated.sort() #list ...
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2answers
81 views

Improving this script - GPX reading and processing with Python OGR

I am trying to plot every GPX trace I have in a folder, by reading it with Python-OGR, clipping it by a bounding box, and plotting Curently I have a working script, but it seems very uggly, and I ...
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1answer
47 views

how to open shp file which created by using python-ogr in qgis?

I have done following steps, so how I open that created shp file in Qgis driver=ogr.GetDriverByName('ESRI Shapefile') out=driver.CreateDataSource('pts.shp') ...
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1answer
225 views

OGR CreateLayer returns TypeError

I'm trying to create a shapefile layer based on the spatial projection of an already existing raster. (Ultimately, this will be used in gdal.Polygonize to get a shape from my raster data.) However, I ...
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1answer
187 views

Writing shapefile with projection defined crashes fiona

I've just started trying to use Fiona to write out shapefiles. I found the example code below, which seems to work fine from shapely.geometry import mapping, Polygon import fiona # Here's an example ...
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4answers
2k views

Is it possible to create 3D dxf with OGR?

Does anyone know if it's possible to create a 3D dxf with OGR. I would like to assign our contour lines a z value and export them to dxf for some cad work. PS I know FME can do this, however I would ...
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2answers
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Python, OGR and Mapnik: Possibility of passing existing ogr.Open() datasource into Mapnik without using mapnik.Ogr()?

Okay, I'm trying to modify create_utfgrids.py to use an OGR VRT file, rather than shapefiles, and while the OGR stuff in this code responds to the VRT, the Mapnik stuff is not. It's failing with.. ...
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1answer
89 views

How to get the mapserver WFS OGR driver to encode unicode in geojson

Running mapserver 6.4.1, gdal 1.14.3 I try to output some WFS features using outputformat=geojson. The relevant bits of the mapfile are appended below. Everything works fine, but unicode characters ...
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2answers
43 views

Ogr2ogr not executing

I am trying to run this Ogr2Ogr command but it doesn't execute when entered. What is wrong? ogr2ogr -f GeoJson -where "neighborhood IN ('Lower East Side', 'Greenwich Village', 'Columbia St', ...
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65 views

How do I link OGR with spatialite?

Problem & Evidence: I'm trying to create a spatialite file with the code snippet below. However the outDataSource object gets assigned NoneType and all subsequent (unshown) code fails. I'm ...
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44 views

Explicitly close a OGR result object from a call to ExecuteSQL

How can I explicitly close/release the result of an ExecuteSQL statement when querying a Spatialite database with OGR via Python? I have a simple query to return the SRID of a dataset. This works as ...
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2answers
977 views

Convert KML to shapefile without losing attribute data

So I want to convert KML files to SHP shapefiles to load it onto PostGIS. Currently I'm using ogr2ogr to do the conversion for me, but it wipes out all the attribute data. How do i preserve this ...
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5answers
3k views

installing GEOS, PROJ, GDAL/OGR into a python virtualenv on Mac OS X

I am trying to setup an isolated python virtualenv to work on GIS projects on my Mac OS X. Sounds like I will need to install the GEOS, PROJ, GDAL/OGR from the kyngchaos site here ...
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1answer
83 views

ogr2ogr reprojection works on command line but shifts output when same command run from inside python?

Reprojection with ogr2ogr works fine on command line, but shifts the polygon to northeast when same command is run from inside python using os.system(...) Any ideas why this could be? I hard-coded ...
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2answers
77 views

Error getting ESRI Shapefile driver OGR in C++

I am unable to create an OGR Layer using the C++ API. I have followed the documentation at this link exactly http://www.gdal.org/ogr_apitut.html I get an error trying to get the shapefile driver. Any ...
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5answers
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What's the easiest way to install GDAL and OGR for Python?

I am developing some code in Python, and I want to use the GDAL/OGR python bindings. What is the minimum I need to install in order to use the GDAL and OGR python bindings? What is the easiest way to ...
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Importing OGR from OSGEO Issues

I am trying to run: from osgeo import ogr and I get: Traceback (most recent call last): File "", line 1, in from osgeo import ogr File ...
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2answers
520 views

OSX 10.9 + QGIS 2.0.1 - Missing osgeo module

Running the following: QGIS 2.0.1 (via Kyngchaos) OSX 10.9 GDAL/OGR 1.10.1 (via Homebrew). Recently, I've become unable to use the OpenLayers plugin, which is complaining that I'm missing the ...
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2answers
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How can I convert a csv file of WKT data to a shape file using ogr2ogr?

This question is related to Shapefiles to Text. I have a csv file, with one column, where all the rows correspond to WKT POLYGON()'s: WKT POLYGON(...) POLYGON(...) ... I'm familiar with how to ...
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43 views

Converting MDB File With Unicode Characters

I'm using C# wrapper of GDAL and I'm having a problem converting MDB file that contains unicode characters. Lets take for example conversion to KML file, non-English characters are replaced by '?' ...
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2answers
2k views

How do you open shapefiles with ogr2ogr

I'm following along the D3 tutorial, and on this line: ogr2ogr \ -f GeoJSON \ -where "adm0_a3 IN ('GBR', 'IRL')" \ subunits.json \ ne_10m_admin_0_map_subunits.shp run into the following ...
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ogr / osr for node.js / javascript

I use a python module I created that does tests for point in polygon. It uses the python osgei/ogr and osr modules. Specifically, I use the following elements of these modules: ...
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1answer
54 views

Convert list of coordinates to OGRGeometry or WKT

I am using a Visvalingam-Whyatt simplification script and the output is a list of coordinates such: [[[[-10885205.10690245 3525662.26531131] [-10885369.01690829 3525374.0741439 ] ...
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QGIS crashes when trying to display features form MySQL

I import shapefiles into MySQL using the following command: ogr2ogr -f MySQL MySQL:GIS,host=localhost,user=root,password=root /home/user/Public/myshape.shp -nln Shape_table -update -overwrite -lco ...
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1answer
60 views

Why does this python OGR code for creating a layer and then adding a field not work?

Spot the difference! So this works... fp = "C:\\LiDAR\\MyLayer.shp" layer = "MyLayer" driver = ogr.GetDriverByName("ESRI Shapefile") data_source = driver.CreateDataSource(fp) srs = ...
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1answer
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SetFeature creates infinite loop when updating sqlite feature using OGR

when using the SQLite driver in python - setting a feature after changing an attribute field value creates an infinite loop on the first record. the same code works fine if i substitute the sqlite ...
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0answers
60 views

How to export postgis points as blocks in dxf with ogr2ogr

I'm trying to export postgis points as blocks to DXF format. I have a simple table in postgis with columns: CREATE TABLE pod_com_azimuth ( ogc_fid integer, rotation double precision, pointtype ...
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2answers
339 views

Conflict between ArcPy and GDAL/OGR?

TL;DR I can't get an installation free version of GDAL/OGR to work from within ArcMap 10.0. I get an ImportError: DLL load failed on _mod = imp.load_module('_gdal', fp, pathname, description). ...
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39 views

Adding a Vertex To Exisiting Feature(linear) Using OGR Python

I am working on a project that involves finding the intersection of linears in a shapefile, if that vertex(the found intersection) doesn't already exist for each(or one) of the features, then that ...
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Can OGR handle Esri's Geodatabase extensible markup language (XML) files?

The USDA Forest Service distributes GIS data as Esri Geodatabase extensible markup language (XML) files. I downloaded one in the hopes that I would be able to convert it to something less esoteric ...