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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4
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3answers
3k views

gdal2tiles.py generates wrong tiles / MapTiler the right ones

I'm trying to generate tiles with gdal2tiles.py and the resulting tiles are stored as 18/132639/164219. If I do the same thing with MapTiler (the GUI variant of gdal2tiles) the tile result is ...
4
votes
1answer
2k views

processing MODIS hdf files with gdal

I'm trying to open an MODIS file (hdf format) with gdal in a python script under windows OS. I use the HDF4 driver, as read at http://www.gdal.org/frmt_hdf4.html. But when I run it I got this error ...
4
votes
2answers
1k views

Gdal Python Bindings and File Geodatabase API

I'm trying to get python 2.7 to work with GDAL/OGR and an ESRI file geodatabase. There have been a few similar questions asked but the answers don't fully resolve my situation. I have installed the ...
4
votes
1answer
535 views

How to convert a png with known bounds from Plate Carree to Mercator with GDAL

I have a png image that shows the region defined by the geo bounds UpperLat, LeftLon, BottomLat, RightLon (in degrees & -ve for West Lon and South Lat) in Plate Carree EPSG:4326. I want to convert ...
4
votes
1answer
717 views

raster algebra in python with rasters of different extents

I am trying to find out how to use GDAL & numpy modules to average a set of rasters....which are Sigma0 values from satellite passes at different times within a year. Each raster has been ...
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 ...
3
votes
1answer
1k views

Georeferencing a raster using GDAL and Python

I want to georeference a raster using python and GDAL. My current approach is to call gdal_translate and gdalwarp using os.system and an ugly list of ground control points. I'd really like a way to do ...
3
votes
2answers
1k views

Exporting 16 bit single-band to 8 bit in SAGA/QGIS

Everytime with every function (e.g convert data storage type or gdal-translat -ot Byte) the output is a completely white map with a black border. only the "save as" export works, but the TIFF also ...
3
votes
1answer
3k views

ogr2ogr : Converting KML to GeoJson

I have a requirement to convert .KML file to GeoJSON or JSON. Can you please recommend open source command line tools on GNU/Linux(2.6.32-358.14.1.el6.x86_64)? I have installed gdal, when I run.. ...
3
votes
3answers
608 views

Gdal: how to get the max and min altitudes of my topographic raster?

Given a .tiff topographic raster image. How to get the altitudes of the highest and lowest point/pixel ?
3
votes
2answers
2k views

Help making geotiff and reprojecting to EPSG:4326

My goal is to download a gif file from this webpage: http://aviationweather.gov/data/iffdp/2104.gif Then crop it to the known latlon bounds of 75N,45S,35W,70E, convert to geotif, and then project to ...
3
votes
1answer
476 views

gdal2tiles.py problem - creating mini tiles

I have a similar problem to the issue posted here (gdal2tiles problem). I have 80 GeoTIFFs (4000x4000) with EPSG:27700 projection embedded and TFW and PRJ files. These I have built into a virtual ...
3
votes
1answer
1k views

GDAL bindings problem with ArcMap 10.1 Python tool

I'm really getting mad with this. ArcGIS sometimes can be so just...irritating! Forgive me if this question is by any means duplicating this one or similar ones, but I really can't find my way out of ...
3
votes
1answer
312 views

st_clip and gdal_translate: “Error browsing database for PostGIS Raster properties” - Why?

Im using shell-script, postgis2.0 and gdal for trying to clip raster apart, using an overlapping raster and a the_geom-object. At first I create a view to clip the overlapping part of the raster. It ...
3
votes
3answers
1k views

Proper gdaltransform syntax to transform a list of coordinates?

this is probably a very simple question, but I'm very new to GIS so I just need one last nudge. I've got a sense of the Linux utility gdaltransform and I am feeding it coordinate pairs in ...
3
votes
1answer
1k views

how to get the projection from a vectorlayer in qgis?

Hi I am trying to set the projection on a raster to match that of a vector point layer. Thus I need to findout what is the projection of a give layer, to use it in the GDAL.Dataset.SetProjection() so ...
3
votes
3answers
2k views

Batch script converting and resampling orthophotos

I would like to convert more than 300 orthophotos produced at scale 1:8.000 with a pixel size of 0.8m X 0.8m from Ecw format to Tiff format and after resampling pixel values. My aim is to batch ...
3
votes
1answer
524 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
2answers
122 views

How can I convert points in EPSG:2956 to EPSG:4326 with pyproj?

I have some points in EPSG:4326 -110.28879750 64.46310187 405.49938863 -110.28879359 64.46310086 405.45967110 -110.28880175 64.46310446 405.93823604 -110.28880245 64.46310258 405.48060850 ...
2
votes
0answers
181 views

Zonal computations: computing raster pixel counts within polygons using GDAL versus rasterstats

I'm computing some zonal statistics, and was comparing the results obtained using the GDAL cookbook example code here with the rasterstats zonal_stats function. I want to compute the mean value per ...
2
votes
1answer
55 views

How to average gdal_hillshades?

For some unknow reason, my average of 3 hillshades is very dark : gdaldem hillshade input.tif hillshades_C.tmp.tif -s 111120 -z 5 -az 315 -alt 60 -compute_edges gdaldem hillshade input.tif ...
2
votes
0answers
833 views

How do I install the GDAL bindings for C#/.NET 4.5.1?

I'm trying to use the C# gdal bindings but I get an error in my C# code which says "Unable to load DLL 'gdal_wrap': The specified module could not be found. (Exception from HRESULT: 0x8007007E)". ...
2
votes
1answer
1k views

convert vector (point shape) to raster (tif) using python gdal lib in qgis

I'm trying to convert a vectorlayer (point- shapefile) to a raster-dataset (tiff) using python gdal-library in qgis. On Graphical UserInterface I simple choose the menue ...
2
votes
1answer
143 views

Clip raster by shapefile in parts

Please help write .sh script command to clip raster by polygonal shapefile. Shapefile have name field with unique name of polygon feature. On the output must be rasters with name of polygons in ...
2
votes
1answer
314 views

QGIS show gdal_polygonized file in EPSG:54004 instead of EPSG:3857

I am polygonizing a TIFF with the gdal_polygonize.py and the resulting Shape is shown in QGIS in the wrong projection - EPSG:54004 instead of EPSG:3857. I have a TIFF in EPSG:3857 and polygonize it ...
2
votes
1answer
442 views

Qgis - raster values become integer when Polygonizing

When using the GDAL plugin, "Polygonize (raster to vector)" any values in the resulting vector layer is truncated to integer. I have a raster showing windspeeds in squares of 500*500 meters, in the ...
2
votes
1answer
702 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 ...
2
votes
1answer
2k views

What are the appropriate parameters to convert .asc file to geotiff using gdal_translate?

My starting file of interest is an ASC file with the following gdalinfo Driver: AAIGrid/Arc/Info ASCII Grid Files: sd_1_3_110805.asc Size is 11880, 9720 Coordinate System is `' Origin = ...
1
vote
2answers
53 views

How to access Shapefile metadata and metatypes information using OGR?

I'm trying to use ogrinfo to get some details on a shapefile. Now, the only way that I know is using orginfo: ogrinfo -ro -so -al BRA_001.shp But its display all information about the shape: ...
1
vote
2answers
145 views

Problem with contour lines thickness in bigger zoom levels

I'm a beginner user of GDAL tools. I'd like to rasterize contour lines into Tiff file (for example such region: N47E006), everything works for quite small zoom levels e.g. 10... but the problem is ...
1
vote
0answers
118 views

GeoDjango: AttributeError: function 'GDALAllRegister' not found [closed]

Im trying to get started with GeoDjango. I am using this https://docs.djangoproject.com/en/1.8/ref/contrib/gis/tutorial/ tutorial. When I run "python manage.py migrate" This error occur: ...
1
vote
1answer
979 views

Changing color of raster images based on their data values - gdal

Let's say I have 1 band raster images with Gray Color Interpretation and I want to change their color based on their data values. Data values -1, will be Blue, -0.5 will be Light Blue, 0 will be ...
1
vote
1answer
669 views

using GDAL/python to stack georeferenced images of different sizes

I am in the process of porting a code I wrote in IDL (interactive data language) to python but am running into a bit of a problem that I am hoping someone can help me with. The code goes like this: ...
1
vote
2answers
638 views

GDAL and Python - Don't print GDAL Error messages

According to the GDAL Python Documentation, GDAL functions do not raise exceptions or errors but do print errors to the console via stdout and stderr. I have some code in my script that calls ...
1
vote
2answers
548 views

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: ...
1
vote
3answers
540 views

Convert .tiff data to bitmap just when rendering and at runtime by visualC++ code

I need to convert a .tiff image to a bitmap one without saving the bitmap. I know that I should use GDAL_translate but because I'm new, this function's interface is a little complicated for me. Could ...
1
vote
1answer
665 views

How to extract a WCS layer with gdal_translate?

There is a certain WCS layer that I'd like to save it to my local computer for analysis. According to GDAL WCS driver draft: "Accessing a WCS server is accomplished by creating a local service ...
1
vote
2answers
602 views

How to produce a mean raster file based on other raster files? [duplicate]

Possible Duplicate: Tools to flatten the jp2 to a single band (average the bands)? I have a number of raster files from a same area, that coordinates of corresponding pixels perfectly match ...
1
vote
0answers
718 views

How to add ECW support to GDAL bundled with PostGIS Windows

I'm currently trying the new raster functionalities of PostGIS 2.0 and I successfully imported some GeoTIFF file into PostGIS (although it only find one band so it's all black and white for some ...
1
vote
2answers
3k views

Get extent of Georeferenced Rasters in Python and output to polygon shapefile

I would like to create a shape file containing the extents of each of the rasters in a directory. Is it possible to capture the extent of a raster using Python? I have tried ...
0
votes
0answers
116 views

gdal2tiles: how to make filenames of tiles to represent xyz coordinates?

I'm converting ECW file to tiles using gdal2tiles. Right now the tiles and folders generated by gdal2tiles are named as numbers starting from 0 successively. The folder structure looks like: How to ...
0
votes
1answer
61 views

Facing a problem when re-projecting a file?

I am trying to re-project from Equi-rectangular. The file is provided as HDF5. I wonder why half of the map is not projected correctly. gdal_translate -of "ENVI" -gcp 0 0 0 90 -gcp 1440 0 360 90 -gcp ...
0
votes
3answers
621 views

Is it possible to use GDAL without admin rights?

I am trying to do some image analysis in Python but am unable to install GDAL due to limited rights. I have attempted copying some of the files and folders into my python folder but am constantly ...
0
votes
0answers
403 views

How to read vector datasets using GDAL library

Up to now, I have used GDAL in order to read raster information and geotiffs and show them with the help of OpenGL. Now I have a vector dataset, and by that, I mean I have the files with types: DBF ...
10
votes
1answer
1k views

Understanding the Map Tile creation properties

I am trying to create a tile base map. I have an image that I want to create the tile from and I am using GDAL. I managed to create the tiles but when I view the result it seems that the tiled map ...
9
votes
2answers
1k views

Python, GDAL and building raster attribute tables

I have an integer raster for which I would like to build a raster attribute table using Python and GDAL. I can create a GDAL raster attribute table in Python as follows: >>> rat = ...
7
votes
0answers
173 views

PyQGIS save raster as rendered image, then use GDAL tools on it

I have tried to use the code from QGis Save Raster as Rendered Image. i is a raster layer: pipelayer = i pipeextent = pipelayer.extent() pipewidth, pipeheight = (pipelayer.width(), ...
7
votes
1answer
367 views

How to access file geodatabase (.gdb) rasters with GDAL?

I'm working on a tool that converts raster layers to arrays for processing with NumPy, and ideally I would like to be able to work with rasters that come packaged in a .gdb without exporting them all ...
7
votes
1answer
520 views

Multiple versions of GDAL (32bit and 64bit) on same machine

I currently have GDAL installed on my Windows 7 64bit workstation. It is the 32bit version. I chose the 32 bit version because I wanted to use the GDAL Python bindings with a 32bit installation of ...
6
votes
2answers
4k views

How to add *.ecw files to QGIS 2.0 on Windows?

How do I add and view *.ecw raster images in Qgis 2.0 ?