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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Get the outer ring inner ring for a given polygon using ogr python binding

I am trying to read the geometry of some shapefiles, now I meet some problem when I try to identify the polygon with holes, since a polygon may(or not) have one hole(or multiple holes). This is the ...
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1answer
272 views

Union multiple shapefiles with overlapping shapes

I have several shapefiles that overlap and I would like to union their geometries to get rid of those overlaps. I know how to do this with OGR and Python for single geometries. from osgeo import ogr ...
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2answers
2k views

No ogr module despite having gdal installed?

I am trying to use the mapping component of the wonderful PySAL package, but for some reason I do not have the ogr module. I was under the impression that it came packaged with gdal. Am I missing ...
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50 views

GeoJson attributes encoding limitation

I have problem when trying to encode attribute values in latin1 using ogr GeoJson driver. Accent char are not displayed correctly. Is the geoJson encoding is limited to UTF-8? I cant find any info ...
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1answer
39 views

ogr: what is the advantage of using `geom.Clone()` over `geom`?

What is the advantage of using geom.Clone() over geom? Simple example: geom = link_feat.GetGeometryRef() newfeature.SetGeometry(geom.Clone()) # or newfeature.SetGeometry(geom) ...
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91 views

How to get feature for a given bbox from shapefile by ogr

I have some features point,line,polygon with shapefile format, now I want to get features for a given boundbox, is it possible to remove the features out of the bbox? And for a polygon, I think it is ...
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1answer
219 views

GDAL - How to get gemetry type of a MapInfo TAB file?

I am using the OGR MapInfo File driver to read a MapInfo TAB file. However, the function GetGeomType() returns 0 which means 'wkbUnknown` even if the features in the TAB are only multi-polygons. Is ...
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110 views

aggregate counts on a grid and determine grid adjacency

So here is the problem I am working on. I have a bunch of lat, long coordinates for event occurrences. I want to create a grid and then count how many points fall into each grid pixel. Once I have ...
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230 views

create polygon adjacency matrix using python

I am trying to create an adjacency matrix from a set of polygons. That is, I have a bunch of polygons and I want to identify which polygons have a common edge or "touch" each other. Once I find this ...
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1answer
117 views

My class using ogr to calculate distance is returning incorrect results away from the equator

In an answer to this question ustroetz kindly provided some sample code for use of ogr to do lat/lon distance and point in polygon calculations. I've created a Python class based on his example to do ...
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1answer
258 views

Are the functions in OGRPolygon accessible through the python bindings?

I'm currently trying to use the OGR python bindings to process some shapefiles. I want to obtain the number of interior rings in a polygon feature. Unfortunately I'm unable to use the documented ...
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1answer
132 views

writeOGR column limit error: “Creating Name field failed”

I have a SpatialPointsDataFrame with 1057 elements and 4760 columns and want to export it to a shapefile. When I try to do this with writeOGR() I get an error: > ...
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30 views

ogr: confusing results from `SetSpatialFilter()`

My layer is derived from a data source like this: l_131 = bounds.ExecuteSQL("select * from 'nam_l' where 'ND_5'= 131 ") feat = l_131.GetNextFeature() feat.GetFeatureCount() >>> 200 It is a ...
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1answer
3k views

How to clip a line layer based on polygons with QGIS?

I have a line layer and a polygon layer. Both files have the same SRS. I want in a new shape file only the lines covered by the polygons. I tried in QGIS the Vector -> Geoprocessing -> Clip ...
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4answers
317 views

Trouble converting .osm to .pbf with Osmosis

I would like to convert a shp file to map file. I know should use these steps: shp -> osm -> pbf -> map For step 1 I use a python script : ogr2osm.py For step 2 I use osmosis, but I get ...
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2answers
260 views

Need help assigning values to field using OGR in python

I've got a similar question to this one How to programatically populate a shapefile field with polygon areas in OGR?, but the solution doesn't seem to be working for me. I am trying to import a ...
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0answers
54 views

Transformation of OGR style data

I have been using GDAL/OGR in a project and it is going quite well. I have been re-projecting data from various source formats into a single CRS (using the C# bindings), but one issue I have come ...
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1answer
183 views

Equivalent function to shapely's envelope in ogr?

I wrote a very simple python function that gives me the envelope/bounding box/...based on two coordinate pairs (ower left and upper right corner): # ... def get_bounding_box(self, ll_corner, ...
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1answer
714 views

Import shp to Postgis using Python and ogr

I just export a Postgis Table to shp using this tips but I'm not able to import a shp to Postgis using the same library(ogr). Any idea? Thanks a lot f.
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1answer
1k views

QGIS 2.0 without MySQL connector

On a mac (Mountain Lion), after a major upgrade to GDAL (1.10) and related frameworks from KyngChaos page, QGIS 2.0 doesn't show any MySQL connector: Add Vector > Database > ... The driver ...
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1answer
346 views

How to use the OGR/GDAL configure options in QGIS python environment

I’m looking for a solution how to use the OGR/GDAL configure options (--config) in the qgis python environment. http://trac.osgeo.org/gdal/wiki/ConfigOptions Setting special configure options is ...
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131 views

ogr2ogr/python overwrite PostGIS table

Using ogr2ogr command line I can overwrite or append to an existing PostGIS table like: ogr2ogr -f "PostgreSQL"-overwrite PG:"host=myserver port=54321 user=user dbname=mydbname password=mypassword" ...
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1answer
53 views

ogrinfo returns a negative coordinate for extent of mif data file

I'm trying to get the extent of a MIF file using ogrinfo. The MIF file is supposed to be in epsg:23030 projection. This is: PROJCS["ED50 / UTM zone 30N", GEOGCS["ED50", ...
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1answer
4k views

R : convert a spatial polygon objet to spatial polygon data frame

My goal is to modify an existing shapefile by merging certain polygons. After importing the shapefile and using the UnionSpatialPolygons command, I get the polygon outline that I want. However, this ...
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3answers
1k views

PostGIS: parse geometry wkb with OGR

I'm trying to pull a LineString geometry out of PostGIS and parse it with OGR (python bindinds). from osgeo import ogr import psycopg2 connection = psycopg2.connect("...") cursor = ...
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100 views

Getting “Segmentation fault: 11” with ogr in Python

This is the code I'm trying to run: In [1]: from osgeo import ogr In [2]: datasource = ogr.Open('testdata.shp') In [3]: datasource.GetLayerCount() Out[3]: 1 In [4]: layer = ...
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101 views

GEOS assertion failed

The following script fails, if I import the 'rasterstats' library. import rasterstats import ogr geom1 = ogr.CreateGeometryFromWkt('POLYGON ((415924.806155724043492 ...
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1answer
69 views

Is it possible to get all projections form OGR?

I'm working on a project where the user can give my program so GIS data which may or may not have which projection it is using. So is it possible to get a list of all the projections from OGR or ...
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1answer
307 views

ogrinfo sql example

I'm having trouble learning how to query my shapefiles for certain features. I have a shapefile that looks something like this when I summarize it using the following command: ogrinfo -al -geom=OFF ...
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2answers
803 views

How to access Shapefile metadata using OGR?

I'm trying to use ogrinfo to get some details on a shapefile I downloaded. Currently, the only way I know how to do this is to load it into QGIS and manually click around to find any information on ...
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469 views

Will MapInfo only read PostGIS data that has been loaded via EasyLoader?

NMZ says in this thread that MapInfo will only read data in PostGIS that has been loaded by MapInfo's EasyLoader. I wasn't sure if this was still the case so I've loaded data into postgis via ogr2ogr ...
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257 views

How can I get Google Fusion Tables to work in QGIS?

I am using GDAL/OGR 1.10 and QGIS 2.0.1. I am trying to load a google fusion table into QGIS using the method mentioned in this blog post. The only difference is that I am not declaring a email and ...
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2answers
56 views

Comparing projections of two datasets when SRID not available

Similar to this question: How to test if two GDAL datasets are in the same projection? However, the above does not cover cases where an SRID is not available. It can often be the case that an SRID is ...
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3answers
254 views

Shapefile with overlapping polygons: calculate average values

I have a very big polygon shapefile with hundreds of features, often overlapping each other. Each of these features has a value stored in the attribute table. I simply need to calculate the average ...
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1answer
135 views

How can I use the proj string in java code?

I want to do projection from UTM/oblique mercator CRS to WGS84. And I know the solution to use a proj.4 string in commandline like+proj=omerc +lat_0=51.4 +lonc=7 +alpha=-10 +k=1 +x_0=0 +y_0=0 +gamma=0 ...
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1answer
253 views

Why does OGR driver.Open() for File Geodatabase give AttributeError: NoneType object has no attribute Open?

There are a number of existing Questions that hint at a possible Answer to this Question, but none seem to be providing me with the solution to my problem: How to access feature classes in file ...
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0answers
168 views

How to compile QGIS with Oracle Spatial support for Linux?

I compiled it on Fedora and Ubuntu, but got error "Cannot get Oracle select dialog from provider." while trying to add Oracle layer. Packages in repositories don`t have oracle spatial support. Can ...
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1answer
39 views

Debug/Improve Performance of GRASS v.in.ogr

I'm trying to import shapefiles (in this case, OpenStreetMap data) into GRASS (grass70-svn) using v.in.ogr; and it is painfully, brutally slow. At first I thought this was because I was using the ...
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372 views

OGR-Driver GML axis order handling (GDAL, QGIS)

By default the OGR-Driver will swap the axis order to longitude, latitude for geographic coordinate systems. "Since OGR 1.8.0, the GML driver has coordinate system support. This is only reported ...
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3answers
4k views

Where do I find the ogr2ogr command for Mac OS X Lion?

I am looking for the equivalent of FWTools for Mac OS X, Lion. Is there anything I can easily install and get that command?
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3answers
359 views

KML to Shapefile using GDAL (LIBKML) - MultiGeometry data not transforming

I am trying to convert a KML file to Shapefile using GDAL (ogr2ogr). Regular KML files convert fine but KML files containing MultiGeometry features (eg: Geometry containing both Point and Polygon) do ...
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2answers
166 views

Can I use the LEFT (string) operator in ExecuteSQL()?

In QGIS I can use the LEFT operator on a dataset like this: LEFT( "Name2",3) ='031' What is the syntax for using this expression with ogr in python? Isn't this the right syntax? ...
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1answer
1k views

OGR Layer Intersection

I am using what I would describe as the most primitive method of doing intersection with OGR. The short script below describes how I do it. Is there a best way of doing this? from osgeo import ...
2
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1answer
158 views

How can I delete a shapefile using OGR?

In my QGIS Python plugin, I use shapefile layers and I am having a problem rewriting existing shapefiles. Is it possible to delete a shapefile from disk using OGR?
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272 views

Convert from Gauss-Kruger to Bing coordinates / projection

I am trying to convert a shapefile with ogr2ogr from Gauss-Kruger (zone 4) to Bings coordinate system / projection using the advice given in ...
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144 views

Why is ogrinfo showing no layers from an ESRI FileGDB?

I have an ESRI File Geodatabase (FileGDB) (size is 15+GB), which has over 10 layers, when I open it up in ArcGIS, everything seems to be working. I want to move this database to postgreSQL with OGR ...
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2answers
938 views

How to change shapefile longitude from -180 - 180 to 0 - 360?

I have a shapefile of world countries, with longitude between -180° and 180°. How can I change the shapefile (eg. with ogr2ogr) for having longitude between 0 and 360°. Following OSGEO/Trac ...
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2answers
226 views

Homebrew OGR with FGDB support on OSX 10.9

This answer worked beautifully in 10.8, but isn't working immediately in 10.9. The link to download the FileGDB API still works, but there are a bunch of options available I don't remember from ...
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2answers
81 views

Ogr2ogr - shape to postgis - is there a way to use and preserve an existing primary key?

I've been struggling with this for a while, tried a few different ideas inspired by these pages: http://www.gdal.org/ogr2ogr.html http://www.gdal.org/ogr/drv_pg.html ...
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2answers
720 views

OS X Mavericks: accessing GDAL from Terminal issue

I successfully installed QGIS on my iMac with OS X 10.9.1 Mavericks using the installers provided by Kyngchaos. However, I'm having troubles accessing GDAL / ogr from terminal. It's giving me the ...