GDAL is an open source translator library & utilities for raster geospatial data formats. As a library, it presents a single abstract data model to the calling application for all supported formats. It also comes with a variety of useful commandline utilities for data translation and processing.
27
votes
9answers
10k views
How to install GDAL with Python on windows?
Can anyone please explain to me in step by step instructions how to install GDAL/OGR with Python on Windows. I have Windows Vista and I have tried following the information on the website and it does ...
19
votes
2answers
1k views
Can ESRI's 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 ...
8
votes
2answers
1k views
How to get FGDB support in GDAL 1.9 without compiling?
I was hoping that I could use the 'master' (nightly-build) version of QGIS to get fgdb support without compiliing (I'm not a developer and frankly have wasted days of productive time trying to get ...
6
votes
2answers
2k views
How should I use GDAL to perform a transformation?
Greetings,
I am a student who wishes to use GDAL to transform a series of images from Lambert Conformal Conic (EPSG: 9802) to Google Earth's WGS 84 (EPSG: 4326) for a web mapping project. I know ...
5
votes
2answers
815 views
How to georeference using GDAL tools?
I have a .tiff image that I am trying to overlay in google earth. For that I require to georeference it first.
The image projection is UTM with NAD83 as datum. I know the lat/long of the four corners ...
4
votes
2answers
304 views
gdalwarp in a bash shell for loop
I would like mask several images in bash shell, gdalwarp works for me as a simple single line command:
gdalwarp -cutline mask.shp -cwhere 'kepnev="a.tif"' -crop_to_cutline a.tif a_masked.tif
...
4
votes
1answer
1k views
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.
14
votes
6answers
3k views
Should GDAL be set to produce GeoTIFF files with compression? Which algorithm should be used?
I have a folder of GIS data that consists mainly of GeoTIFF files. The whole set weighs in at about 1.2 GB. I noticed that if I pack the contents into a tarball, it smashes down to about 82 MB. I ...
14
votes
5answers
3k views
How to cut a 'tiled image' from a raster dataset using GDAL?
I am working on an app that needs to create tiles (jpeg) from a given raster dataset. My initial inclination was to use gdal2tiles.py, but its performance seems like it could be improved.
That leads ...
8
votes
3answers
2k views
Clipping raster with vector layer using GDAL
I have installed GDAL using the Osgeo installer. How can I clip a raster layer with a vector layer programmatically? Is there any GDAL API available which can help me with this? I am using Python.
13
votes
3answers
3k 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 ...
9
votes
1answer
520 views
How to access feature classes in file geodatabases with Python and GDAL?
I am trying to access a vector dataset in a ESRI File Geodatabase using Python + GDAL.
I have successfully compiled GDAL with the file geodatabase API. The FileGDB driver is working correctly since ...
8
votes
6answers
789 views
How to add field with filename when merging shapefiles with ogr2ogr?
I'm merging some shapefiles and I had some problems doing so inside QGIS, so i'm using ogr2ogr directly.
I'm doing this (in a batch):
ogr2ogr -overwrite %destination% %n1%
ogr2ogr -update -append ...
5
votes
3answers
4k views
How can I install gdal 1.9.0 on my linux ubuntu server 10.04
apt-get install python-gdal installs version 1.6.0 and this is already installed. I would like to install the 1.9.0 version. Do I have to de-install 1.6.0 first and then compile manually or is there ...
4
votes
1answer
2k views
How to import a raster into PostGIS?
I'm trying to follow the instructions here to load a raster into a PostGIS database:
python raster2pgsql.py -s 4269 -I -r *.tif -F myschema.demelevation -o elev.sql
I understand that I replace * ...
6
votes
1answer
541 views
Importing GDAL from ArcGIS python window - is it possible?
I am trying to run some Python code using the Python window in ArcGIS 10.1 that uses both the arcpy and gdal modules. However, when I try and import the gdal module I get an error:
ImportError: No ...
5
votes
2answers
1k 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
...
4
votes
2answers
3k views
How to install stable GDAL on Ubuntu 11.10?
I am trying to install the stable ubuntu package from here https://launchpad.net/~ubuntugis/+archive/ppa/+packages on my ubuntu 11.10 server
I have added the ubuntugis stable repository to server's ...
2
votes
1answer
341 views
merge raster images: error message procedure not found
I am using QGIS 1.8.0. Whenever I try to merge raster images I get the following error message:
Traceback (most recent call last):
File "C:\PROGRA~1\Quantum GIS Lisboa\bin\gdal_merge.py", line 36, ...
5
votes
5answers
770 views
Python, shapely library: is it possible to do an affine operation on shape polygon?
I am trying to create a rotated rectangle in lat/lon coordinates.
Basically I have the coordinates of the center and rotation angle around the center.
Is it possible to do using, shapely or gdal, or ...
4
votes
2answers
714 views
Translating grid to USGS .dem in C# via GDAL
I am attempting to translate ArcInfo binary grids to USGS DEM format (.dem). I have installed the GDAL .NET bindings thru this build installer. I can get to GDAL in my C# add-in I am working on. ...
3
votes
1answer
180 views
Get the geotransform in Mercator given a pixel size away from the origin
I have a radar image with the following information:
The projection is Mercator (Mercator_1SP in GDAL)
The projection origin is 0º lat 0º lon
At a given geographic coordinates (e.g. lon=10º ...
3
votes
1answer
343 views
How can I merge geotiffs with a vrt file?
I have heard that I can use a vrt file to merge mulitple geotiffs into one?
what is the syntax? gdal_tranlsate -of VRT file1.tif file2.tif file2.tif
Something like this?
3
votes
2answers
534 views
Overlaying GPX data on rasters in QGIS
I have a series of raster map images that I would like to use in QGIS and overlay some simple GPX routes over the top to produce a custom map image.
This is all quite new to me so please bare with ...
2
votes
1answer
640 views
Error installing GDAL 1.9.0 python package
I'm trying to install the GDAL python package in a python 2.7.1 environment on RHEL 5. I am using the command 'pip install GDAL'. I have no problem installing other packages like numpy, etc. in this ...
1
vote
1answer
140 views
Tools to flatten the jp2 to a single band (average the bands)?
I have created thousands of png tiles using arcgis and have merged groups of them into large jp2 files for serving via geoserver. I need to flatten these to a single band so that I can apply a colour ...
1
vote
3answers
2k views
Convert Lambert Conformal Conic to WGS84
I am trying to convert my "Lambert Conformal Conic map with 2 standard parallels" to the basic/standard WGS84 projection that Google Maps use.
I have 30 of these maps which I need to convert. They ...
12
votes
3answers
5k views
How to georeference a web mercator tile correctly using gdal?
As an example I will take the following tile http://a.tile.openstreetmap.org/3/4/2.png and save it as "4_2.png".
The WGS84 coordinates of this tile can be calculated or read there by clicking the ...
6
votes
1answer
152 views
How to get raster corner coordinates using Python GDAL bindings?
Is there a way to get the corner coordinates (in degrees lat/long) from a raster file using gdal's Python bindings?
A few searches online have convinced me that there is not, so I have developed a ...
6
votes
2answers
4k views
Converting projected geoTiff to WGS84 with GDAL and Python
Apologies if the following question is somewhat stupid, but I am only VERY new to this whole GIS thing.
I am trying to convert some projected geoTiff images to WGS84 using gdal in python. I have ...
4
votes
1answer
732 views
How to get GDAL to create statistics for GTiff in Python
I regularly create my own GeoTIFF rasters with GDAL in Python, e.g.:
from osgeo import gdal
from numpy import random
data = random.uniform(0, 10, (300, 200))
driver = gdal.GetDriverByName('GTiff')
ds ...
1
vote
1answer
903 views
How to process GRIB2 Data for Visualization?
My goal is to extract wind information from data provided to me in the GRIB2 format as it has been done in the attached image.
I was curious if anybody had any experience with this format. I'm not ...
7
votes
3answers
1k views
Make the nodata area of a resampled orthophoto overview white?
I have a set of orthophoto images which are each fully filled with data, but when placed together the coverage does not form a rectangle so there are nodata areas.
In MapGuide, I need to be able to ...
5
votes
3answers
992 views
GDAL and Geospatial PDF on Windows
GDAL 1.8 now supports reading GeospatialPDF, see pdf format description page. Using it depends on the poppler pdf library. What is the smoothest route to getting gdal and geospatial pdf working on ...
2
votes
3answers
489 views
Viewshed Analysis With GDAL
I am looking to perform a simple (one observer location) viewshed analysis on a standard DEM using GDAL (either python or .NET bindings).
I have searched, but haven't found any readily available ...
2
votes
2answers
645 views
GDAL Clipping (hack)
I am trying to use the python script from http://www.sparkgeo.com/labs/2010/07/07/gdal-clipping-hack/ to clip a raster based on many shapefiles. The script is using a mysql database an i would like to ...
13
votes
3answers
4k views
How do I change geotiff “no data” color to white/transparent rather than black?
I am preparing data for inclusion into a geonetwork node, where the maps are displayed via geoserver. The problem is that cells that have"no data" are displaying as black in the geotiff and I am would ...
9
votes
3answers
941 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, ...
8
votes
6answers
702 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 ...
8
votes
4answers
2k 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 ...
7
votes
2answers
269 views
How to catch PostgreSQL/PostGIS errors in GDAL/OGR Python bindings?
Is it possible to catch PostgreSQL output error messages in OGR after a query has failed?
For example
conn.ExecuteSQL('SELECT * FROM non_existing_table;')
In Postgres this returns an error ...
7
votes
4answers
1k views
Open source software to merge large shape files
Some background: I have 2 polygon shape files with approximately 500,000 records each. The two files are identical in terms of field structure.
Using ArcGIS 10.0 I can'nt merge these two files using ...
6
votes
2answers
524 views
How to split shapefile per feature in Python using GDAL?
is it possible to split a shapefile per feature in python? (best would be a solution where i can temporarily save the resulting vector objects to the memory instead to disk).
The reason: I want to ...
6
votes
1answer
2k views
ECW for QGIS 1.8 in Ubuntu 12.04
I have followed various online help guides on how to make ecw for QGIS 1.8 work in Ubuntu 12.04. I had it all working in Ubuntu 10.04 but since migration to 12.04 no such luck.
Is there a guide that ...
5
votes
2answers
255 views
Where can the GDAL executables be found in a QGIS installation?
I run QGIS 1.8.0 Lisboa on a Windows 7 machine. Yesterday I attempted to install the TauDEM plugin using these instructions: http://lists.osgeo.org/pipermail/qgis-developer/2012-June/020807.html
...
5
votes
3answers
473 views
How to convert factfinder2.census.gov map data to KML?
I've downloaded a map from http://factfinder2.census.gov/faces/tableservices/jsf/pages/productview.xhtml?pid=DEC_10_SF1_P1 (limited to San Francisco census tracts), and I'd like to convert it to KML ...
5
votes
1answer
892 views
What tile/tiling strategy should I use with GeoNode/GeoServer?
I've got a wicked GeoNode instance running, loaded with some basic vector data. I want to be able to serve our local-County aerial imagery as a basemap within GeoNode. I am thoroughly overwhelmed with ...
3
votes
4answers
406 views
Batch processing DEM rasters in QGIS/GDAL
I am attempting to add relief shading to map using .asc raster files, following this tutorial. It works well, but I have only tried it on single tile of raster data which is 20x20km. I want to ...
3
votes
1answer
367 views
Want to use GDAL in Arc10 toolbox via subprocess call
I'm attempting to launch a version Python 2.5 that supports GDAL from an ArcGIS10 toolbox script. I'm doing this because I'm having loads of trouble importing the GDAL library directly into Arc, and ...
2
votes
1answer
445 views
Converting CIB data to Google Tiles with GDAL
I'm trying to convert CIB map data into Google compatible Tiles through the following process (in Linux, GDAL compiled from source):
gdalbuildvrt data.vrt A.TOC
gdal_translate -of VRT -expand rgba ...
