GDAL (Geospatial Data Abstraction Library) is an open source translator library & set of command-line utilities for processing raster spatial 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 ...

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10
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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 ...
5
votes
1answer
848 views

Python equivalent of gdalbuildvrt

Is there a way to perform the same task as the gdalbuildvrt utility using GDAL Python bindings? So far I have not found any way to do this other than creating a vrt of a single dataset and manually ...
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
396 views

PostGIS Raster in MapServer

I'm having trouble getting a PostGIS raster to load and display in MapServer. I'm not sure, but suspect it's a version problem. My mapfile layer and the error message are shown below. LAYER ...
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, ...
8
votes
1answer
2k views

GDAL RasterizeLayer Doesn't Burn All Polygons to Raster

I am trying to burn a shapefile to a raster using GDAL's RasterizeLayer. I pre-create an area of interest raster from a different shapefile, given a specific pixel size. This AOI then serves as a base ...
8
votes
4answers
3k 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 ...
7
votes
3answers
7k views

How can I get the proj4 string or EPSG code from a shapefile .prj file? [duplicate]

I have to work with a shapefile defined in an unusual projection, which my GIS software does not know about. How can I get the proj4 definition or the EPSG code for the projection?
4
votes
1answer
528 views

How to apply “Band” settings using gdal Python bindings?

I am trying to replicate the gdal_translate command, but using pure Python: gdal_translate infile.tif outfile.tif -co COMPRESS=JPEG -co PHOTOMETRIC=YCBCR -co TFW=YES -b 1 -b 2 -b 3 I have ...
4
votes
2answers
620 views

What's the best projection for rasterization of random latitude and longitude data in the northern Atlantic?

I have a dataset in the WGS84 geographic coordinate system that I would like to interpolate along a grid using Python. It appears gdal_grid is not available through the Python bindings, so I plan to ...
4
votes
2answers
4k 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 ...
3
votes
1answer
450 views

How to run OSgo4W shell script on Windows?

I have a lot of DEMs that I want to use to create hillshades, slopes and color relief from and would like to automate the processes using a shell script within OSgeo4W shell. Here is the code I used ...
3
votes
1answer
499 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 ...
2
votes
2answers
460 views

Reclassify rasters using GDAL and Python

Using @SS_Rebelious very useful answer, I am trying to reclassify rasters using GDAL and Python. I have a grayscale raster (with values ranging from 0 to 255) and I want to reclassify it to a binary ...
2
votes
1answer
143 views

gdalwarp won't export AAIGrid

I'm trying to use gdalwarp to reproject an ascii grid file. According to http://www.gdal.org/formats_list.html this shouldn't be a problem and indeed I can happily use gdal_translate to create grd ...
2
votes
1answer
375 views

How can I dynamically trim the informational border off of FAA sectional raster charts?

I'm trying to write a script that can automatically use GDAL to crop the informational border from the FAA's published sectional charts (GeoTIFF) found here: I know that I can use gdal_translate ...
2
votes
1answer
751 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, ...
0
votes
1answer
139 views

gdallocationinfo is not recognized

I tried to run gdallocationinfo from my FWTools shell and got a message saying: "gdallocationinfo is not recognized as an internal or external command, operable program or batch file". So I checked ...
6
votes
3answers
1k views

How do I extract a raster's extent in python?

I am looking for an easy way to extract a raster's extent in python. Currently, I am using gdalinfo and then parsing out the corner coordinates. The problem with this approach is that gdalinfo is ...
4
votes
2answers
234 views

How to convert float raster to vector with python GDAL

I have float raster and now I want to convert it to vector. How is it possible with python gdal library? I have tried with gdal_polygonize.py of gdal utilities in command line and it worked excellent. ...
4
votes
1answer
381 views

gdal_translate- why jpg compressed tif is 2 times greater than jpg file?

Using the following two commands yields completely different size files: gdal_translate test.tif -of GTiff -co "COMPRESS=JPEG" -co "JPEG_QUALITY=100" output.tif and gdal_translate test.tif -of JPEG ...
4
votes
3answers
2k views

GDAL_translate: converting ESRI GRID to Geotiff in batch

The Challenge: To batch convert 1000 rasters in ESRI Grid binary to Geotiff using either using a batch file or Python 2.7 without ArcGIS/Arcpy module. The Tools: Win7Pro, GDAL 1.9.2 (via OSGeo4W), ...
4
votes
2answers
1k 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
2answers
106 views

gdalwarp leaves horizontal artifacts regridding from EASE-Grid (laea) to Polarstero (stere)

I'm trying to understand how to use gdalwarp to warp an image. I believe I'm doing the basics correctly, but I might be missing some gdalwarp options? Any help would be greatly appreciated. The ...
3
votes
1answer
797 views

Re-project raster image from Mercator to Equirectangular

I have a raster image of the world map in Mercator projection, square 1:1 format. I want transform the image into an Equirectangular projection accurately. I assumed from my research that GDAL would ...
3
votes
2answers
3k views

How to convert a .tif with .tfw to a GeoTiff?

I have a tif image file, and a .tfw world file (created from OSM data with Mapertive). How can I (using linux command line) convert that to a GeoTIFF file? (i.e. I want to have one file, not 2). I'm ...
3
votes
2answers
457 views

GDAL TMS (WMS) mini driver

I've a problem with GDALs TMS mini driver. I've created an xml file, which i can open in qgis. I am using local tiles on my computer which i prerendered with mapnik, the map covers entire country of ...
3
votes
1answer
847 views

Serving 4 band GeoTIFF in GeoServer 2.1.4

I have an uncompressed GeoTIFF file (figure 1) with the following band information: Image Structure Metadata: INTERLEAVE=PIXEL Band 1 Block=5000x1 Type=Byte, ColorInterp=Red Band 2 Block=5000x1 ...
3
votes
3answers
3k views

How to generate a shapefile containing an UTM grid (graticule)?

I'm looking for a shapefile containing an 1000m or 2000m UTM grid ("graticule"). All I was about to find on the web is a 10000m UTM grid (here: http://en.giswiki.net/wiki/UTM) and I am aware that a ...
3
votes
1answer
779 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
2k 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 ...
3
votes
2answers
762 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
108 views

Reprojecting a raster image using gdalwarp

I am trying to reproject an ECW Orthophoto from 25830 to 23030 srid. I tried the following but I am getting an error: C:\Program Files (x86)\FWTools2.4.7>gdalwarp -s_srs 25830 -t_srs 23030 ...
2
votes
1answer
245 views

How to remove strange gdaldem hillshade artifacts?

I've downloaded 9 chunks of 1 arc-second NED in IMG format from the National Map. I'm trying to create a hillshade from them. I'm using: GDAL 1.10.0, released 2013/04/24 First, I combine them and ...
2
votes
1answer
468 views

How to re-project the EASE (Equal Area Scalable Earth) grid with a ~25 km cylindrical projection to WGS84 0.25 degree?

I have nc files ,here is one file https://echange-fichiers.inra.fr/get?k=LUfqiyO1Dl7az5bihnS. from the metadata ,the projection is cylindrical and the resolution is 25 km: ...
2
votes
1answer
916 views

Filtering a raster by pixel value ? (Qgis)

I have downloaded Globcover data in GeoTIFF format. I want to create a new grid which only has values where the Globcover data (the only band in the TIF file) has one certain value (==190). Can I do ...
1
vote
2answers
973 views

Import error:No module named _gdal

I have installed python 2.5.1 and FWTools2.4.7 in my laptop(Windows 7) when i run my pythonscript in FWTools i get following error Import error:No module named _gdal can any one suggest how to solve ...
1
vote
1answer
2k views

Clip raster layer with *raster* mask layer in QGIS

Given two input layers 1. The clip layer - an arbitrary layer (though in my case it's a float 1 band geotiff) 2. The mask layer - a paletted raster in which every pixel is either NO DATA or a single ...
1
vote
1answer
421 views

How to convert 4-channel PNG files to grayscale geoTIFFs?

I suspect that there exists a gdal tool (gdal_translate?) that will convert a 4-channel PNG (+ world file) to a 1-channel (gray-scale) geoTIFF. From the gdal_translate man page, it appears simple to ...
1
vote
1answer
950 views

Python GDAL: degrees to meters without reprojecting

I am trying to get senseful results in my Python script. I want to measure distance between features in a shapefile. I'm working with the SRS: GCS_WGS_1984, so my units are in degrees. But for the ...
1
vote
3answers
4k 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 ...
0
votes
1answer
277 views

Creating records in output shapefile using Python

I have a list (output from a previous loop) containing attributes from an input shapefile. What I am stuck with is inputting those attributes to a new shapefile. I have plotted the point data using ...
0
votes
1answer
855 views

Missing QGIS raster menu tools - '“osgeo [python-gdal]” module is missing'

I recently had to reinstall QGIS (version 2.2.0-9) and the raster menu is missing its tools. I understand that the GdalTools plugin must be installed and enabled. I have already installed the GDal ...
24
votes
2answers
960 views

A comprehensive, user-friendly GDAL manual?

I'm becoming a real fan of using GDAL tools in a bash terminal. However, I quite often get stuck trying to solve particular problems, or getting syntaxes right. Apart from the details provided in the ...
10
votes
6answers
1k views

How do I iterate through every cell in a continuous raster?

See this link for more details. The Problem: I want to loop through a continuous raster (one that has no attribute table), cell by cell, and get the value of the cell. I want to take those values ...
7
votes
2answers
913 views

What Open Source (command line/API) method is there to orthorectify and georeference an aerial image given telemetry data?

How can I take an image and orthorectify it automatically with open source software? The information associated with each image is: camera specs latitude, longitude, elevation of the camera ...
12
votes
3answers
8k 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 ...
14
votes
2answers
2k views

Good practice for generating contours from a DEM

We have just received a large set of DEMs at work and I would like to generate contours from them. The DEMs have a resolution of 1m and a size of 1kmx1km. Output from gdalinfo: Driver: ...
10
votes
2answers
9k 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 ...
8
votes
3answers
5k views

How to fully load a raster into a numpy array?

I have been trying to check my filters on DEM raster for pattern recognition and it is always resulting in missing last rows and columns(like..20). I have tried with PIL library, image load. Then with ...