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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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 ...
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6answers
871 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 ...
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1answer
783 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 ...
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3answers
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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 ...
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4answers
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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 ...
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0answers
406 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 ...
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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, ...
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2answers
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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 ...
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2answers
207 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 ...
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4answers
6k views

How to add an attribute field to an existing Shapefile via Python

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 ...
14
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6answers
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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 ...
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5answers
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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
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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 ...
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1answer
637 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 ...
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2answers
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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 ...
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3answers
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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
559 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. ...
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2answers
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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 ...
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2answers
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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 ...
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3answers
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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 ...
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4answers
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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 ...
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1answer
661 views

esri pgdb in qgis

Using osgeo4w 1.5, when I go to add vector layer and select file type, navigate to my esri pgdb. I get a not a valid or recognized data source. If I use the database type I get a page that defaults ...
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2answers
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How to convert GML Surface to SHP Using OGR?

I have a very large .gml file with multiple layers in it. I would like to export one of these layers to .shp. It is a polygon layer (of lakes). However, I am getting the error: ERROR 1: ...
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4answers
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how can i convert a shapefile to lat and lon boundaries?

i have a shapefile of country subdivisions and i would like to extract an array of bounding lat and lon for each division.. is it possible to do?
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2answers
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Segmentation Fault (segfault) when using OGR CreateField() in Python

Receiving a segfault when running this very short script in Ubuntu. from osgeo import ogr, osr shpfile = 'Census_County_TIGER00_IN.shp' def cust_field(field): '''cust_field(shpfile, field) ...
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How to add custom Feature attributes to ESRI Shapefile with Python?

I am seeking a way to take an existing ESRI Shapefile that has a Feature set of 200 countries. Each country Feature has an attribute of "NAME." My objective is to create a Python script that adds an ...
7
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2answers
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Deploying Application With C# GDAL/OGR Bindings

I developed a relatively simple web app that uses the C# OGR bindings to do a couple of simple geometric functions; buffer, clip...etc. I developed this application on my local machine, which has ...
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2answers
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Geodatabase to PostGIS character encoding

Similar to another question I posted previously, I'm trying to import datasets from Esri geodatabases into a PostGIS database directly, and inside the data there are greek letters and symbols that are ...
5
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1answer
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How to resample a batch of rasters using OGR/GDAL?

I'm looking for a function similar to GRASS r.resample. I have a folder full of TIF files and want to reduce their resolution ("scale them down") to reduce file size.
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5answers
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How to convert line simple features to topological network?

using Gdal/ OGR is there a way to convert a shp, kml, or PostGIS line layer into a network of nodes and segments so it can be used in packages such as networkx?