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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ogr.GetDriverByName('FileGDB') returns None

I installed: gdal-110-1600-x64-core.msi GDAL-1.10.0.win-amd64-py2.7.msi gdal-110-1600-x64-filegdb.msi from www.gisinternals.com I can open my gdb on the command line: C:\data>ogrinfo ...
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1answer
386 views

Error when using gdal/ogr and python to clip a “shp” file by a “shp”

I am new to the gdal/ogr library for python and I was wondering how to clip a shp file by another shp file. I think I am having trouble with the syntax. Thanks - Stefan I keep getting a windows error ...
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1answer
177 views

Problem with showing Shape file in Geoserver

I have a number of Shape files from a customer. I can read them with both ogrinfo and QGIS. They don't have a prj-file, but I know that the projection is EPSG:3006. When I add them as layers in ...
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119 views

How to check are there any OGRGeometry (polygons) within an OGRGeometry (polygon) ?

Please see my image: I used the below statements to get Geometry: OGRGeometry *poGeometry; poGeometry = poFeature->GetGeometryRef(); Do you know how to check whether the Polygon 1 ...
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1answer
147 views

Can't convert geometry from Dgn file to Shape file?

I am using below codes to try convert geometry from a Dgn file to Shape file. But, I can't exit the Feature reading loop. Are there anyone know why and how to fix it ? Please download the dgn file ...
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2answers
551 views

OGR Projection transformation error

I am trying to convert shapefile that was created by FME in EPSG:900913 to EPSG:3857 (I know its the same definition) with OGR in a script. datasource = ogr.Open(os.path.join(dirname,shapefileName)) ...
3
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0answers
51 views

How do I get the domain from an OGRSpatialReference?

I would like to know what the projected bounds are for a spatial reference using OGRSpatialReference. Is there some way to use the GetProjParm method to get this information? An example of what ...
5
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1answer
2k 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 ...
5
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1answer
749 views

Python - OGR: Transform coordinates from meter to decimal degrees

I have a point in a shapefile. The shapefile is in a WGS_1984_Web_Mercator Projected Coordinate System. I want to get the coordinates of that point in decimal degrees with GDAL/OGR in Python. I am ...
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88 views

Python GDAL/OGR: check lines geometries connectivity

I'm working with shapefiles representing roads, so basically it's stored as (poly)lines. I need to perform a road connectivity checking. In other words, I want to ensure that roads meant to ...
2
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1answer
426 views

Batch convert OSM/PBF data

I need to import some OSM data about a region of Italy into a SHP file or Postgres DB, possibly with batch process. I already use OGR2OGR to batch import data from SHP to Oracle and Postgres and I ...
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1answer
122 views

OGR UnionCascaded gives strange lines (flat polygons)

I'm using OGR to perform a union using UnionCascaded. All my polygons have been created by GDAL polygonize which ensures that all polygons follow pixel edges and should therefore align nicely. But I ...
5
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4answers
381 views

How to computational efficiently check if there are any overlapping polygons in a group of polygons?

I need to do some processing with groups of polygons. If any of the polygons in the group overlaps other polygon the result is unpredictable and don't throw any error. So, I need to detect if there is ...
3
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2answers
556 views

GDAL SQL syntax to add field an put values

I try to make a new field in my attribute table and put in values from another field after converting from character to integer but can't get the right syntax. I run this as shell-script in MSYS. cd ...
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1answer
128 views

Creating prepared geometries with OGR from Python

Is it possible to create a prepared geometry object using the Python SWIG geos.ogr module? It seems that Shapely and GeoDjango both have this functionality, but I can't see any mention of it in the ...
2
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3answers
200 views

How to test if geometry is inside another?

I need to tell whether geometries from a shapefile are inside other geometries or not. For example, I want to test if there are trees (represented as points in trees.shp) inside the urban areas ...
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0answers
47 views

how to get correct geo reference system for a VMap

I am new to GIS, trying to read the GeoRef System for VMap by using the following code: OGRSpatialReference *ref = layer->GetSpatialRef(); if( ref ) { QString georefSystem = ...
12
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1answer
551 views

How to rename field names in a shapefile from the commandline?

I need to rename the field names (attributes) in a shapefile. Is there an easy way to do this from the command line?
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4answers
282 views

Does shapefile or MapInfo TAB have advantage as source format for OGR conversion to GeoJSON?

I'm relatively new to OGR and GIS in general. Most of the sources I look at give a choice of ESRI shapefile and MapInfo formats. I'm using ogr2ogr to convert these to GeoJSON for import into ...
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0answers
103 views

traversing KML files with ogr python

i'm new to OGR processing and KML format so be gentle: i've got a series of KML files all containing multiple regions partitioning a larger area in each. i also have a series of geocoded points for ...
2
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1answer
253 views

OGR - Weird GeomType -2147483645 on polygon shapefile

I am trying to import a shapefile (multipolygon) in an app with ogr but I got an error about invalid geom type. If I inspect the data with ogr like this: datasource = ogr.Open("c:\\temp\\data.shp") ...
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1answer
414 views

OGR OSM-driver unable to open datasource

I want to read an OSM file with OGR. I use Version GDAL 1.9.1, released 2012/05/15. To read a SQLITE file works fine: $ ogrinfo test.sqlite INFO: Open of `test.sqlite' using driver `SQLite' ...
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4answers
429 views

Get vector features inside a specific extent

The problem: I have a very large vector layer with many features and a much smaller raster layer in a defined region. I want to get only those vector features which are within the raster layers ...
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3answers
132 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 ...
3
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1answer
1k views

better way to duplicate a layer using ogr in python?

I'm splitting a large shapefile into many smaller ones using ogr. I'd like to just copy all of the field and layer config information from the original. Here's how I'm doing it now: src = ...
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2answers
233 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 ...
2
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1answer
294 views

need help for script checking topology using ogr in python

My main goal is to create a new feature indicating if the line features intersect each other as well as if they are not connected to a feature. My problem is how to identify the intersecting and not ...
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2answers
84 views

OGR GetX() returns always zero

I am trying to get the first x-coordinates of a polygon. However I only get zero in return. What could cause that? import os, sys, gdal, ogr from gdalconst import * driver = ...
2
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1answer
205 views

Convex Quadrilateral Polygons subdivision in equal parts using Python / OGR

Consider an irregular polygon (P) which has four vertices. I would like to subdivide P into smaller polygons as shown here http://i.stack.imgur.com/4SKhB.jpg In the old days I was using ArcGIS 9.3 ...
2
votes
1answer
194 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 ...
3
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1answer
238 views

Python - OGR: Distance different than in ArcGIS

I want to determine the shortest distance between a point and a line. I use the following Python script to do so. If I compare the result of the script with the result of ArcMap's Near Analysis, I get ...
4
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1answer
282 views

OGR Info - Check for spatial index?

If we want to get information about a vector layer (shapefile for example) we could use ogrinfo: ogrinfo -so myshapefile.shp mylayer This returns a lot of pertinent information about the shapefile. ...
2
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0answers
85 views

Custom python datasource to QGIS

I'm working on a homebrew spatial feature data format, and using Python to write it's API. It occoured to me that use some tool like QGIS to display my data would be very nice to have, for debug/test ...
2
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1answer
1k views

Installing GDAL with Java Bindings (gdal.jar) on Ubuntu 12.10

I am trying to build a postgis importer for mutliple shapefiles. After geotools took orders of magnitude longer than shp2pgsql to import my data, I decided to attempt to use the java bindings to GDAL ...
2
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1answer
57 views

QGIS QgsOgrProvider library

I asked a question here: http://stackoverflow.com/questions/14790463/qgis-copy-layer-in-c-plugin and I was suggested to find the library which provides QgsOgrProvider::createEmptyLayer() function. Can ...
2
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1answer
322 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: ...
4
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1answer
201 views

How to use -lco options in gdal_contour?

I'm trying to create contours from geotiff raster with gdal_contour. My output format is Postgresql and I would like to ovewrite the existing table. When I do: gdal_contour -a 1 -f PostgreSQL -i 50 ...
4
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3answers
955 views

Python OGR: convert a point geometry into polygon

I'm writing a routine for creating the convex hull envelop around shapefiles of islands. I could read the data, extract polygons vertices into a geometry and then compute the convex hull. Now I need ...
3
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1answer
153 views

shapefile batch clip and merge combined

I have two shapefiles, one is polyline, the other polygon. For each polygon I would like to clip the polyline vectors inside. Using arcpy I already found part of a possible solution: ...
2
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1answer
84 views

How to interpret the OSGeo4w software version under Advanced Install option?

When choosing to install QGIS Desktop using the OSGeo4w advanced install option, I noticed that there are what looks like ambiguous software versions to choose. For example, currently QGIS Desktop ...
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1answer
82 views

SHAPE FILE to TIGER with OGR

How do I convert SHAPE FILE to TIGER using GDAL (OGR). I try but throw following error:(layer number)is not a known TIGER/Line layer.
2
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3answers
125 views

OGR: Meaning of “2.5D extension as per 99-402”

I'm looking at the enum defs in ogr_core.h. I see a bunch with comments that read: 2.5D extension as per 99-402. What in the world does that mean? Presumably it's referencing a spec or RFC? ...
3
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1answer
427 views

Simplify polygon in OGR

We use ArcObjects pretty heavily and simplify polygons using something similar to the ITopologicalOperation::Simplify(void). No tolerance is passed in as the parameter (it uses the XY tolerance of ...
12
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1answer
3k views

How do I get the pixel value of a GDAL raster under an OGR point without NumPy?

I am working on a computational model of the abundance of wild pollinators across a landscape. The model itself is complete, and I am now struggling with a post-processing step. I have my GDAL ...
5
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1answer
140 views

GDAL/OGR Determine if dataset is raster or vector

I am writing a script using the GDAL/OGR Python bindings and it is possible that the user may provide a raster dataset or a vector dataset as input. If the user provides a vector dataset, the script ...
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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 ...
4
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1answer
366 views

Efficient computation of nearest distance for each point to closest polygon

I'm looking for a more efficient way to compute the nearest distance between features from 2 layers, in this example for each point the nearest distance to the closest polygon. Is there a more ...
4
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2answers
325 views

How do I Capture GDAL projection and create matching output (OGR or GDAL) shape files?

Working in C++, using GDAL and OGR: Depending on what the user has supplied for image input, I need to output point (or other) shape files in the same projection as the input raster images. The ...
4
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2answers
334 views

how to cast integer to float in an ogrinfo sql statement?

I have a shapefile for which I would like to add the values in a column. As the sum exceed the capacity of an integer, I need to cast values to a float. I tried the following: ogrinfo -sql "SELECT ...
2
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2answers
672 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 ...