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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Gdal: How iterate through all pixels of a raster image?

Given a topographic raster image. How to iterate through all pixels of this raster image ? Solution preferably with gdal, in console. Some other libraries/script could be installed. Related: ...
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1answer
450 views

Error during conversion of shapefile to MySQL using ogr2ogr

I have installed MS4W in Windows 7. I get an error when I try to convert a shapefile to MySQL database using GDAL/OGR ogr2ogr. This is the command I'm trying: C:\ms4w\tools\gdal-ogr>ogr2ogr -f ...
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1answer
349 views

OGR: How to save layer from AttributeFilter to a shape filter?

I select a subset of features from my shape file like so: node_lyr = nodes.GetLayer() q_str = "%s = %i" % (field, value) node_lyr.SetAttributeFilter(q_str) What is the best way to make a shape file ...
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491 views

GDAL/OGR to extract pixel values

I want to use GDAL/OGR to extract pixel values from a raster file. The extraction should be based on polygons, stored in a shapefile. My thought was to iterate over the features in the shapefile, ...
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1answer
248 views

Importation of .csv on grass gis converts numeric data to string data

When importing a csv file on grass7, the numeric data is converted into a data of type string. My csv looks like this : id_core value 1 F1 83.0611472396 2 F2 98.8584345936 3 F3 ...
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317 views

What is required to get OGR to work with SQL Server?

All, I've been having heaps of trouble getting OGR to connect to our SQL Server development environment. (read about it here and here) SQL Versions: 2008, 2012 OS's: Windows 7, Ubuntu 12.04 My ...
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366 views

Why won't OGR connect to my PostGIS database, but QGIS will?

Trying to connect to my PostGIS database with some success... One hiccup is that OGR will not connect to my server from a remote machine, though QGIS can connect to it just fine from that same ...
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138 views

How to shift vertices of shapes in shapefile using FOSS python library?

I need to shift each vertice of shape in a shapefile (of any type:point, line, polygon, multiline etc.) with Python. I need to loop in all shapes, get the vertices, get it's coordinates and for each ...
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1k views

How to read csv with WKT geometry in Arcmap?

I have found several parcels I need on a county map viewer. However, the only option to download any of the data is found on a click context menu to "Copy selection as csv" which gives me this: ...
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1answer
118 views

Using ogrinfo to list all projection source of a database [closed]

I have to reproject all the layers from a database, but some of them are undefined and some are defined in a wrong projection. I would like to sort all those layers in a text file with their source ...
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1answer
258 views

How to make a virtual layer from ogr geometry?

I know how to do this: nodes = driver.Open(node_nav,0) node_lyr = nodes.GetLayer() node_lyr.SetSpatialFilter(None) But how do can use the layer methods on a geometry I created from scratch? ...
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1answer
757 views

How do I get the centroid of line with OGR

Can somebody explain how to get the centroid of a feature with ogr? I have no idea what the centroid() function itself does. >>> linelyr = lineshp.GetLayer() >>> f = ...
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1answer
205 views

ogr SetAttributeFilter uppercase?

How do I use the ogr SetAttributeFilter with uppercases? Code example: lyr = shp_obj.GetLayer() sel_str = "%s = '%s'" % (field, value) lyr.SetAttributeFilter(sel_str) Can I just do: sel_str = ...
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1answer
303 views

SetGeometry problems when using python/ogr

So i am trying to use the difference function and i pretty much create the new file i want but the Geometry is empty. No error is produced. any help would great! Thanks. #!/usr/bin/env python import ...
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1answer
130 views

VSI File API support in ogr2ogr

It seems that support for streaming input is wishy-washy in ogr2ogr. For example, why can I do this: curl "http://data.usgin.org/arizona/wfs?service=WFS&version=1.1.0& ...
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2answers
295 views

Erase method using ogr

I'm trying to find the erase geoprocessing method as i am familiar with in ARC, but i can't seem to find it in OGR using Python. I have looked through the module ogr documentation but perhaps i missed ...
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1answer
2k views

ogr2ogr coverting DXF to shapefile, why am I losing part of the feature?

I'm starting to mess around with some of the GDAL toolsets, specifically the ogr2ogr. I'm working with converting a 2000 ACSII DXF file to shapefiles depending on geometry. Everything seems to work ...
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1answer
112 views

Is there a quicker way of checking if a feature exists with OGR

I'm writing lot's of features to a FileGDB using OGR. The slow point in my script is checking that the feature isn't already in the Feature Class, based on the ID. Currently I'm using a function ...
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1answer
105 views

Is georeference the same as geotransform?

Does georeference mean the same as geotransform? If not then what is the difference?
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404 views

Geometry Projection Speed Test

Lately I've been using the OGR projection classes that come with ogr/gdal, but pyproj was recommended to me, so I thought I'd give it a try. To help me decide if I should make the switch, I did a ...
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2answers
1k views

Python GDAL/OGR: retrieved feature is NoneType

I'm doing some scripts in Python to deal with shapefiles, and I have an issue I don't understand. I'm looping over a shapefile, and I want to retrieve the geometry of each feature, but very often I ...
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1answer
292 views

how is the command of ogr2ogr for converting the adf to shp?

What is the correct format of ogr2ogr for converting the ADF grid to SHP file? I tried this, but it fails. $ ogr2ogr -where "OGR_GEOMETRY='Point'" -f "ESRI Shapefile" SHP.shp ADF.adf
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Gdal/Ogr - OGRLayer.Intersection() Question

I was trying to perform intersection on two feature classes (shape file format) using OGRLayer.Intersection(), but have problems making it work with C# bindings. I am not able to figure out on how to ...
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1answer
131 views

Offset shapefile to start from prime meridian

I have Natural Earth shapefile (for example this file: link) covering whole globe in -180:180 range. I want to offset this file, so that it starts from Greenwich prime meridian instead -180. How can ...
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104 views

Confusing offsets in shapefile written by QGIS/OGR

I think I'm stuck here. A shapefile has been updated in QGIS. Records have been deleted and those records have been marked with an asterix in the first byte of the record in the dbf file. I open the ...
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1answer
307 views

How to sort features in a layer using OGR/Python?

How can I sort the features of an ogr layer by the values of a field? I tried naive variations of def sortlayer(ds, layer, field): lname = layer.GetName() lsort = ds.ExecuteSQL(b'select * ...
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1answer
428 views

How to create feature LineString in a Polygon shape file layer (OGR/GDAL)?

I used below codes to create ShapeFile layer OGRDataSource *poDS, *poSHPDS; OGRLayer *poSHPLayer; ...... poSHPLayer = poSHPDS->CreateLayer (shpFileName, NULL, wkbPolygon , NULL); And I ...
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424 views

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
693 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
308 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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197 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
210 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
1k 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)) ...
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82 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 ...
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1answer
7k 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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1answer
1k 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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122 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 ...
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1answer
789 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
163 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 ...
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4answers
674 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 ...
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2answers
1k 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
167 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 ...
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3answers
380 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
61 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 = ...
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1answer
1k 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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402 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
126 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 ...
3
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1answer
358 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
595 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
824 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 ...