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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Most efficient way to retrieve pixel distributions inside many polygones (custom zonal stats)

I want to get the distribution of pixels from a 1 band raster that fall in each polygon of a shapefile to proceed to some statistics. I guess a zonal statistics does it in some kind of way but I need ...
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67 views

How to read ESRI File Geodatabase (FileGDB) with OGR?

I have a file ending with *.gdb. I don't know what it actually is. I also don't know what to expect inside the file. I am trying to access it with ogr. I tried with ogrinfo: ogrinfo test.gdb ERROR ...
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4 views

how to make shapefile in geometry column of ms sql? [migrated]

I was tried ogr2ogr command like this. ogr2ogr -f "ESRI Shapefile" "C:\temp\sqlexport.shp" "MSSQL:server=[RemoteServerIp];database=[dbname];User Id=[user];Password=[password];trust_connection=yes;" ...
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1answer
56 views

Force OGR to use specific driver for input format

How could one force ogr2ogr to use a specific format to read input files? Out of the box ogr2ogr automatically chooses from it's long list of formats, which most of the time is great. However today ...
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22 views

GDAL/OGR C++: How to connect to SQL

Using GDAL 1.11 it is possible to execute SQL commands against a OGRDataSource: But how do I connect the OGRDataSource to a SQL Database? In my case an Oracle XE 11g. I suppose the OCI drivers have to ...
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17 views

How to use cx_Oracle db connection with OGR API

I am creating ogr datasource for oracle spatial using OCI connection in pyton code successfully. I can also get the layer from the datasource and I can add new features. But I am also using ...
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1answer
42 views

dissolve polygons of GeoJSON with gdal/ogr

I have a GeoJSON with only polygons in it. I have to dissolve (merge) the polygons with the same "DN"-value. I found out that you can do it with shapefiles like this: ogr2ogr outputfile.shp ...
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29 views

Reading/writing utf-8 encoded data using Fiona?

So I have a 'cpg' file with my 'in_file' shapefile data (definitely set to 'utf-8'). I was using 'meta' to create the same schema/crs as 'in_file'...though it runs, my text fields are borked on ...
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2answers
51 views

How to measure distance using shapely

Reading the documentation...it looks like I should have this right, but I don't. The example is: Point(0,0).distance(Point(1,1)) 1.4142135623730951 Based on this example I wrote this block ...
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1answer
47 views

How to call 'shapely' .coords on a fiona filtered list?

I have to filter a shapefile by attribute then compare it to another shapefile using .coords...however I am a bit perplexed how to do this as my filter is returning a list type...(and .coords requires ...
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41 views

Converting JSON to GeoJSON MultiPoint using `ogr.CreateGeometryFromJSON`

I am trying to convert a JSON array to a geom in Python, by first converting it to a GeoJSON. I have point coordinates in a JSON array, [{'lat':100.0, 'lng':0.0},{'lat':101.0, 'lng':1.0'}] that ...
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41 views

create image out of geojson (gdal_rasterize?)

Short version: I need to know how I can convert a .geojson-file to an according .png-file (or any other image format) long version: I have a .geojson which was created by gdal_polygonize from a .png ...
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22 views

Using GDAL with a line layer and points layer, find next point along line layer

With the points layer and line layer, I'm trying to create a graph for path finding. I've got a line layer that I've dissolved, thinking that might make this easier. The points in the points layer lie ...
2
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1answer
134 views

QGIS 2.8.1 ogr OpenFileGDB zip format

I am experimenting with the OGR OpenFileGDB zip file format in QGIS 2.8.1 on Windows 8.1 x64 and although OGR says it can happily read the format (with a couple of Code Page warnings) I am unable to ...
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1answer
45 views

Coordinate Transformation in Gdal/Ogr (EPSG:4326 to EPSG:3068)

I think gdal/ogr(/proj4) doesn't recognize epsg:3068 right? Here is what I tried: public static void transformSRS(){ // creating EPSG:4326 SpatialReference sourceSRS = new ...
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14 views

Reprojecting: Different results in OGR and PROJ.4 for EPSG24373 (India) [duplicate]

I need to convert EPSG4326 lon/lat tuples to EPSG24373 (Kalianpur 1880 / India zone III). However, when using the Python bindings of OGR and PROJ.4 (pyproj), I get different results. I wrote the ...
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1answer
73 views

Difference between osgeo gdal/ogr python module and GDAL C++ library

I am developing application in python and I use the osgeo gdal/ogr python bindings for gdal, but its not clear to me what exactly is the difference between the gdal/ogr in python and the gdal library ...
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2answers
192 views

GDAL in C++: Reading a ShapeFile

I am trying to use the GDAL Lib to read a ShapeFile (.shp). I followed the instructions of http://www.gdal.org/ogr_apitut.html - But it doesn't work! #include <gdal_priv.h> #include ...
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58 views

How to set time field when generating a GPX track with Python OGR?

I want to generate a GPX file with Python OGR. In particular I want to generate a tracks (layer of features of OGR type wkbMultiLineString) My script is below. I get the error ERROR 1: No such field: ...
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2answers
88 views

Find unit of EPSG-Code

I need a way to find out the unit of an EPSG-Code (e.g: meter) from java (ogr, gdal, osgeo?) but any other approach would be fine as well. I want to do something like: if(epsg.unit==meter){ do ...
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1answer
21 views

Processing feature string fields to raster

I am using the GDAL python bindings. I am trying to rasterize a layer from an arcinfo coverage file, but the values I need to rasterize I have to calculate from string fields. OGR can not write to ...
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1answer
46 views

How to get GML layer CRS with OGR Python?

I have a GML layer obtained from a WFS that looks like this: <wfs:FeatureCollection xmlns:ms="http://mapserver.gis.umn.edu/mapserver" xmlns:wfs="http://www.opengis.net/wfs" ...
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42 views

ogr2ogr in java gdal

I would like to code ogr2ogr -f "GeoJSON" destination.geojson source.geojson -s_srs EPSG:3068 -t_srs EPSG:4326 in java-gdal. I tried to understand how it should work by looking at this example but ...
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34 views

How to reach the geometry (polygon, polyline) of a dxf in python-ogr module

this might be a basic question, but I am rather new in ogr. I wish to collect all lines from the dxf file and create their boundary. I loaded the layers (ExecuteSQL( "SELECT DISTINCT Layer FROM ...
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1answer
33 views

Python-OGR how update the geometry of a point

I need to change the coordinates (geometry) of some points in a shapefile. I can't find the good method. if ( zone[best_y, best_x] >= ( nb_pixel_area - toler) ) and ( zone[best_y, best_x] <= ( ...
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1answer
44 views

Adding Origin to Geotiff using Python GDAL?

Alright, so I'm getting closer to figuring this out but I'm stuck at one (that I know of) thing... how do I use GDAL to apply a known origin of a GeoTiff to another that has been processed in ...
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28 views

Ogr Python API: set null values in feature

Im trying to convert OGR geodata from one driver to another, like the command line tool ogr2ogr do, but using the python API. My problem is, that the NULL values in the input data are converted as ...
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1answer
105 views

Writing a shapefile using OGR, from Shapely Geometry - No feature added Error

I am trying to write a shapefile from a Shapely geometry using PyQGIS in the QGIS 2.6.0 console. Lines of code before the OGR method to write shapefile: extnt = poly.extent() # gives a QtRectangle ...
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1answer
67 views

Creating Spatialite DB from Swedish OSM

Good afternoon, I have just started to use GDAL/OGR and I am trying to create a spatialite DB from OSM data. I am using a cut of the Swedish OSM data downloaded from Geofabrik in .osm format. I have ...
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36 views

vsicurl on shapefile is requesting data outside file size range

ogrinfo --debug on --config CPL_CURL_VERBOSE YES -ro -al -so "/vsicurl/http://ascendxyzdatastagingweu.blob.core.windows.net/915295c046e0428e8f4fc94ce9188133-upload9/JORDSTYKKE.shp" given the above ...
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1answer
100 views

Access ESRI .GDB in PyQGIS

I can access ESRI .GDB data using OSGeo's OGR. The following code gives feature class names embedded in .GDB... from osgeo import ogr driver = ogr.GetDriverByName("FileGDB") data = ...
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3answers
127 views

Plotting Geo Points with “by arc centered at” Instructions

A recent Supreme Court decision redefined the legal boundaries of California along the Pacific Ocean: http://www.theverge.com/tldr/2014/12/15/7397085/supreme-court-california-boundaries-map I am ...
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1answer
80 views

How to set the spatial reference to a OGR layer using the Python API?

I create new a Ogr Layer with the Datasource.GetLayer() method: driver = ogr.Open(input_file).GetDriver() datasource = driver.Open(input_file, 0) input_layer = datasource.GetLayer() If the input ...
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1answer
55 views

How to copy a geometry with Python OGR?

I want to copy a geometry with Python OGR within a loop: I tried the following, but I get ERROR 1: Empty geometries cannot be constructed import ogr import copy d = ogr.Open('sampleData.geojson') l ...
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356 views

”No module named ogr” when installing QGIS plugins

In QGIS 2.6.1, when I try to install the FlowMapper and QGIS Cloud plugins, I get an error - "The plugin is broken. Python said: no module named ogr" - giving me the only option of removing them. ...
2
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1answer
118 views

QGIS crash when I try print geometry

I do (it works): 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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1answer
55 views

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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30 views

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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1answer
61 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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1answer
27 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
159 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
72 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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65 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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90 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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105 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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2answers
221 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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1answer
94 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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35 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 ...
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1answer
159 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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55 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') ...