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

learn more… | top users | synonyms

4
votes
1answer
1k views

How to assign OGR geometry a spatial reference when writing to a new layer using the Python API?

I'm using the Python OGR API to add new features to a PostGIS layer. However, despite setting the geometry spatial reference, when the geometry is written out the spatial reference is missing. This is ...
2
votes
1answer
3k views

Projecting shapefile with transformation using OGR in python

I want to change coordinate system of a shapefile from British National Grid to WGS84 (in order to be able to convert it to KML later on). To get the best results of projecting I would like to use ...
5
votes
2answers
663 views

Accessing non-spatial PostgreSQL tables using OGR Python bindings

When connecting to PostgreSQL/PostGIS using the OGR Python bindings is it possible to get non-spatial table names (i.e. OGR layers) from the connection? Currently, doing: conn = ogr.Open("PG: ...
2
votes
1answer
564 views

TopologyException side location conflict reading MapInfo with Sharpmap

I'm using SharpMap 0.9 to read various MapInfo (.tab) files. I have used a number of files without any problem and been able to perform intersection queries on them like so: var interesectionResults ...
1
vote
1answer
781 views

Errors when converting MapInfo .tab to .dxf

I am trying to convert some MapInfo files to .dxf format using OGR2OGR using the following command: OGR2OGR -f "DXF" "input.dxf" "output.TAB" -overwrite -skiperrors When I run this I am getting a ...
1
vote
1answer
924 views

Escaping spaces in paths for use in batch file

I am making a MapInfo program in MapBasic. I am calling OGR2OGR in order to convert some files. To do this I am generating a batch file and then running it. My code looks something like this: RunStr ...
8
votes
4answers
2k views

Is there a mapping between OGR and python data types?

I'm writing a shapefile using OGR in python, creating fields on-the-fly from a python data source. Creation of a new field requires an OGR data type, is there a mapping between OGR and python data ...
21
votes
1answer
2k views

Can File Geodatabase API be Redistributed?

Esri's file geodatabase API can now be used with GDAL/OGR - http://www.gdal.org/ogr/drv_filegdb.html however each individual seems to have to login to Esri and download the API files individually. For ...
4
votes
2answers
990 views

How to cut a shape file?

I want to use a shape file of the Corine Land Cover. This covers all of Europe, but I am only interested in the area of Scandinavia. How can I cut this file using free software (preferably a ...
11
votes
3answers
1k views

ogr2ogr fails to convert GeoJson file > 200MB

As a followup to my previous question (Converting SimpleGeo Places GeoJSON file to shapefile), I am now struggling with what I perceive might be an ogr2ogr "memory" limitation, but I cannot be sure. ...
6
votes
2answers
804 views

Can I change the GDAL/OGR library that QGIS uses?

I have been adding a new format to OGR, all seems well and OGRInfo works. Now I would like to test my code out using QGIS. Is there an easy way to switch which GDAL lib QGIS uses on a windows box? ...
7
votes
1answer
2k views

How to convert Shapefile geometries to WKB using OGR?

I got the geometry of a feature of the shapefile, and i want to save that geometry in the postgis (in WKB formats like it happens when we import shapefiles using shp2pgsql and psql commands). How do I ...
3
votes
1answer
304 views

Create polygon from OGREnvelope

I have a folder full of about 2000 files and I would like to generate a kind of key map for each file so people don't need to just randomly load each one in order to find what is what. I have the ...
6
votes
3answers
555 views

What is the intended Behavior of -skipfailures in ogr2ogr?

I am trying to run ogr2ogr to convert some geojson to shapefile. All is good until any of the geojson features have an invalid geometry (for example, the coordinate array of point geometry is empty). ...
5
votes
2answers
2k views

GDAL Python bindings not picking up OGR PostgreSQL driver

I have a windows server (Microsoft Windows Server 2003) with: Python 2.7, PostgreSQL 9.04-1, GDAL 1.8.1 (installed from the windows installer (gdal-18-1500-core.msi) hosted at ...
2
votes
1answer
1k views

How to combine MapInfo tab files into one spatialite DB?

I have many folders, each with a collection of MapInfo tab files (each folder has the same table names). For each folder I want to merge the tab files into one spatialite DB. My current method is to ...
5
votes
1answer
414 views

How to label raster cells in QGIS?

I try to show a small resolution raster file in the QGIS Print Manager tool. I would like to show a small label with each cell value (position - circa middle of each cell). How I can do it? Is there ...
7
votes
2answers
1k views

DXF attribute to z value

We have been given a DXF that contains a Elevation attribute but we would like to generate a 3D DXF. I know I can generate a 3D dxf from a shapefile using: ogr2ogr -f "DXF" out.dxf in.shp -zfield ...
3
votes
1answer
286 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 ...
4
votes
4answers
638 views

Determine Projection

I was given a shapefile at work with the information that it is in Lambert Azimuth Equal Area (LAEA) projection (EPSG 9820). After some research on the web, I found out that EPSG 9820 is a generic ...
5
votes
1answer
372 views

Combined area of all features within features of another layer

I have a grid shapefile (basically, a half-degree grid of the world, where each cell has a unique id number), and a set of files with features. I want to record for each grid cell, all the areas ...
7
votes
1answer
2k views

Help with PostGIS polygon geometry - non-closed rings

I've picked up a copy of the super-wicked book 'Python Geospatial Development' by Erik Westra (Amazon link), and I'm working through it. Currently, it's teaching me to load GSHHS coastline data from a ...
2
votes
3answers
2k views

Read KML file with GDAL/OGR for Python

I have file : test.kml and I try to open it with GDAL/OGR (1.6) librairie in Python (2.5). But I don't succed can you help me ? This is my code : from osgeo import ogr adresse = 'test.kml' ...
22
votes
2answers
3k views

Python Efficiency — Need suggestions about how to use OGR and Shapely in more efficient way

I'm looking for some suggestions about how to make my python code more efficient. Normally efficiency doesn't matter for me but I am now working with a text file of US locations with over 1.5 million ...
6
votes
1answer
1k views

Spatial joins in OGR SQL

I have seen that OGR supports it's own form of SQL, I was wondering if it's possible to do spatial joins. Something like select all objects where one intersects the other. I did have a look around ...
13
votes
7answers
4k views

Free tool to simplify parcel shapefiles?

Is there any tool available which let's me run millions of parcel shapefiles and simplify them?
15
votes
7answers
12k views

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 ...
1
vote
2answers
322 views

Is it possible to save PostGIS connection string in OGR add-in to QGIS?

In QGIS I've saved a couple of PostGIS connections for adding data. This works fine. I've been unable to save the connections in the OGR layer converter add-in though. Has anyone found a way to do ...
8
votes
6answers
982 views

How do I generate thumbnails images from lots of shapefiles?

A colleague and I recently released an Open Source project called Mapoteca which is a set of Python Scripts that integrates with a GDAL/FWTools installation allowing a full walk-through of directories ...
2
votes
1answer
995 views

gdal_grid problem reading vrt file

I am trying to parse csv file and visualize it as geotiff using gdal_grid but I keep getting this error: C:\work\testgdal1>gdal_grid -ot Float32 -l test test.vrt dona.tif ERROR 1: Failed to ...
11
votes
3answers
4k views

Get all vertices of a polygon using OGR and Python

I'm having a little trouble with the Python OGR API. What I am trying to do is get all the coordinates of each vertex of the outer ring of a polygon. This is what I have so far: import osgeo.ogr ...
2
votes
4answers
4k views

ogr2ogr, convert from shp to postgis error

I am trying to import a shapefile into PostGIS using the ogr2ogr tools that are built into the FWTools package. In my import process I am receiving an error that I don't know how to deal with. ERROR ...
9
votes
7answers
11k views

Fixing corrupt shapefile?

I have a shapefile that I was working on in ArcGIS Desktop 9.3 get corrupted somehow and it gives me the error "Number of shapes does not match the number of table records.". What I would want is to ...
2
votes
0answers
447 views

OGR VRT MSSQL example

I'm trying to import vector data into SAGA GIS from a SQLExpress 2008 server. Firstly is this possible? I would have thought using an OGR VRT layer would have been the way to do it, I've attached a ...
10
votes
3answers
2k views

getting dxf files out of PostgreSQL

I've successfully loaded a bunch of shapefiles into a PostGIS database. I would like to be able to retrieve specific geometry and layers as dxf files based on SQL queries. I'm using PostGIS, GDAL, ...
4
votes
2answers
3k views

ogr2ogr srs options: where is the well known definition determined?

In the ogr2ogr documentation it says that when using -a_srs srs_def: Srs_def can be a full WKT definition (hard to escape properly), or a well known definition (ie. EPSG:4326) or a file with a WKT ...
2
votes
2answers
236 views

Project geometry features upside down

I have shapefiles containing polygons and lines that are used in a mapfile for projecting them through Mapserver. Is there a way in changing the projection of the layers by 180 degrees(i.e. upside ...
17
votes
4answers
9k views

How to add attribute field to existing Shapefile via Python without ArcGIS?

I have a Python script that adds an attribute field to a Shapefile if doesn't exist. This is easy to do with ArcGIS (graphically or via Python), but I'm looking for something that doesn't depend on ...
1
vote
1answer
584 views

Circle features missing in PostGIS after import from ArcGIS using ogr2ogr [closed]

I have a ArcGIS feature class of geometry type polygon. It was created as a convex hull with a 200 meter buffer on a point dataset, aggregating rows on a particular field. The number of points used to ...
16
votes
6answers
7k views

Generate points that lie inside polygon

I have polygon feature and want to be able to generate points inside it. I need this for one classification task. Generating random points until one is inside the polygon wouldn't work because it's ...
12
votes
5answers
4k 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 ...
1
vote
1answer
1k views

Reprojecting from MGRm to WGS84 using open-source tools

I would like to work with some of the Michigan state data (for example, this shapefile of cities ), but it is not in a common projection. However, when I try to reproject the file using ogr2ogr and ...
1
vote
1answer
732 views

GRASS v.out.dxf 3D into AutoCAD

So continuing with my last question (Create 3D dxf with OGR) I have decided to give the GRASS option a go. I have imported my polylines into GRASS using v.in.ogr and converted them to 3D using ...
5
votes
2answers
1k views

Call FWTools (ogr2ogr) from ArcGIS python script

In ArcGIS, I want to use a Python script (and a standard ArcGIS script tool UI) to call functionality from FWTools. How would I make the call to FWTools? I tried using ...
6
votes
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 ...
1
vote
2answers
632 views

Why is every SELECT via a geometry function null?

I'm using Spatialite (2.3.1, binary from the website) on Windows XP via Java ("Xerial Driver"). SQLite loads fine, also Spatialite seems to be loading successfully. I can even do SELECT-statements. ...
4
votes
2answers
1k views

create temporary point geometry feature from coordinates in OGR with Python

I have two shapefiles containing two types of geometry features: one contains polygons and the other linestrings. Because I'd like to use the Within method to check whether the end(or start) of a ...
10
votes
2answers
4k views

Point (of a linestring) within Polygon using ogr and Python

I'm currently working on a project in which I need to build a topological network out of the geometry features I find in shapefiles. So far using Ben Reilly's open source project I've managed to ...
7
votes
3answers
3k views

How To Convert A Set of ARC/Info ASCII .e00, .e01, .e02, etc Files Into .shp Files

I have a set files that I downloaded with extensions (.e00, .e01, .e02, etc). I have read that these are files used by ARC Info mainly, but I do not have ARC and nor am I really that interested in ...
8
votes
4answers
2k views

Best way to find the polygons crossed by a line

I'm trying to find all the polygons crossed by a single line (a GPS track). I'm using the OGR library (from python) for computing this, but it's currently a bit 'brute-force' (and slow). For every ...