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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45 views

Crop using gdalwarp aspect ratio

I'm using Landsat 8 imagery, and the Indicar Landsat Processing Tools to produce NDVI imagery from the Landsat 8 source. That works fine. I then have a bounding box expressed as lat/lon coordinates, ...
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32 views

gdal RasterizeLayer gives different extent to arcpy PolygonToRaster

I have an existing arcpy script which uses PolygonToRaster_conversion to convert a polygon shapefile to raster (tiff). I am now exploring GDAL/OGR and have used the cookbook approach to carry out the ...
2
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1answer
120 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 ...
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66 views

Getting incorrect coordinates for ortho photo using GDAL libraries

I am very new to gis, and while most of the stuff I have is working well, this thing has me stumped. I'm using GDAL libraries and the c# wrapper to access various gis functions. I'm processing ortho ...
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1answer
126 views

Calculating NDVI with Rasterio

I'm using Rasterio to read GeoTIFF files from Landsat 8 and calculate NDVI into a new GeoTIFF file. My code looks like this: import numpy import rasterio import subprocess with ...
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2answers
25 views

gdalwarp: Syntax

In GDAL, I have seen the sample line: gdalwarp $(list_of_tiffs) merged.tiff I would like to merge images to create a mosaic, but can't use gdal_merge (need an exe file), e.g to merge ...
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2answers
86 views

GDAL build from source throwing OpenSSL errors on Ubuntu

I'm trying to get GDAL installed/up to date on my Ubuntu machine, and I can't seem to get it to work properly. I've been following this process: ...
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1answer
67 views

convert raster to xyz without no data values

I want to convert a geotif to an xyz-file by gdal_translate. However, when I use the following statement: gdal_translate infile.tif outfile.xyz -of xyz the nodata values are always within the ...
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30 views

ERROR 6: The PNG driver does not support update access to existing datasets

I was trying to overlay a shapefile to some raster images from a directory using gdal_rasterize. But then encountered this error ERROR 6: The PNG driver does not support update access to existing ...
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58 views

Coordinate Transformation in Gdal/Ogr (EPSG:4326 to EPSG:3068)

I think gdal/ogr(/proj4) doesn't recognize epsg:3068 right? Here is what I tried: public static void transformSRS(){ // creating EPSG:4326 SpatialReference sourceSRS = new ...
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65 views

Can't import libraries to rsaga

I get this error when I'm trying to import a raster to RSAGA: > rsaga.import.gdal(paste(rast_name, ".tif", sep=""),"RASTER", env= my_env) Module 'GDAL: Import Raster' not found in SAGA library ...
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1answer
56 views

ArcMap: Unknown Spatial Reference fix with GDAL/Python

I have a .tif file that I created with Python and when I open it in ArcMap it says it doesn't have spatial reference information. Is there a way to set the spatial reference with GDAL if I have a .prj ...
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1answer
22 views

connect gdal-java with tomcat

I am trying to run: SpatialReference poSourceSRS = new SpatialReference(); poSourceSRS.ImportFromEPSG(4326); String unit = poSourceSRS.GetAttrValue("UNIT"); System.out.println("unit: " + unit); on ...
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1answer
37 views

Cut a hole into a geotiff

I have two hillshading geotifs that I created using gdaldem hillshade. One covers a huge area with an OK resolution and the other has a much higher resolution for a smaller part within the huge area. ...
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36 views

QGIS Polygonize (GDAL) problem - Null value in attribute

Is it possible to use Polygonize in QGIS (GDAL) so that a line shapefile is converted to a polygon shapefile with an attribute(s) in the line file carried into the polygon file. I am trying to build ...
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0answers
70 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)". ...
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1answer
43 views

change projection in an ascii (x,y,z) file

I am having an ASCII file (lat,long,depth) in the Mars projection. I need this file to be converted into WGS-84 projection. How can I do the conversion for the ASCII files.
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2answers
76 views

Install GDAL frameworks and QGIS — redundant?

Just wondering if GDAL tools are actually already within QGIS -- was it redundant for me to install them on my OS X Yosemite independently? Recently I used GDAL tools to explode .kml data for use ...
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39 views

writeOGR alters MultiPolygon holes

I'having trouble using writeOGR to write GeoJSON files, when there are MultiPolygon objects. Here is an example: I'm creating a SpatialPolygonsDataFrame object from GeoJSON, with a single feature made ...
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39 views

python-mapscript on OSX Yosemite

I am keen to try out the mapserver export plugin from QGIS 2.6 This needs python-mapscript which comes from the mapserver package. This can be downloaded from ...
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3answers
76 views

Extract raster values gdal looping rasters

I have this code, most of them getting from this forum. I need to loop over a folder and sub-folders, or just to run a list (putting previously all the raster inside, I don't mind one way or the ...
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2answers
51 views

How do I access GeoTransform array from gdal on the command line?

I'm using the gdal library via OSGeo for windows, and I was just wondering how to access the geotransform array for a .ecw file.
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1answer
64 views

How to convert SPOT NDVI hdf file to tiff file using gdal_translate command

I have SPOT NDVI images. I want to convert NDVI hdf to tiff. I have used the following code to get the information of hdf file: gdalinfo 20060501_NDVI.HDF I get the following output Driver: ...
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1answer
111 views

ogr2ogr unable to open KML datasource

I downloaded some Wikimapia data using the wikimapia.api. Everything is A-OK since I've opened this in Google Earth and everything is in place. However, I need to turn it into a shapefile, or get the ...
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1answer
43 views

Georeferencing uneven/irregularly gridded rasters

I'm trying to take a set of NetCDFs and turn them into georeferenced datasets using GDAL. However, the only Geospatial data is a set of 2-D lat/lon arrays. The projection type is not lat/lon. THe ...
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1answer
20 views

gdaldem hillshade stop working with new projection?

Parallel to gdalwarp `-te -5.8 41 10 51.5 -ts 1980 0` not working with mercator? , my hillshade works with lat/long input : gdaldem hillshade input.tmp.tif shadedrelief.tmp.tif -s 111120 -z 5 -az ...
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52 views

Create tiles for on Google Maps from PNG images

I have some PNG images in 2048, 4096, 8192 and 16384 pixel size to generate tiles for zoom level 3,4,5 and 6. My data are plotted in Mercator projection and centered over a particular area of clat ...
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1answer
31 views

gdalwarp `-te -5.8 41 10 51.5 -ts 1980 0` not working with mercator?

I was working with native lat/log projection on etopo1: #donwload: curl -L -C - ...
2
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1answer
103 views

Why processing.runalg(“gdalogr:rasterize”…) is not creating out files when running in the QGIS 2.6.0 console?

I want to use the QGIS python scripting functions to turn to rasterize a point vector using many different dimensions. Right now my code looks like this: import processing RasterPixelSize = ...
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27 views

How can I improve image quality when using GDAL to generate Google Earth superoverlays?

I'm using the free version of Google Earth, so in order to create superoverlays of my large TIF images I have to use additional software. Google suggests GDAL. Using the instructions Google ...
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73 views

gdal ReadAsArray returning NoneType

I'm trying to read in several rasters as array using gdal in a python script, but I keep getting NoneType returned and can't figure out why. The process is this: 1. Use gdalbuildvrt ...
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2answers
60 views

Using GDAL to get vertices of a multipolygon

I am successfully using GDAL to get the vertices of a polygon from a ShapeFile using .NET code. This link showed me how to do that: ...
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0answers
48 views

netCDF GDAL C# - time:unit?

I'm trying discover how to read the time:unit variable information information from a netCDF file and have run out of ideas. Without this info i cannot auto-magically process the files by date (which ...
0
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1answer
46 views

How to use gdal_grid with VRT?

Hi folk's it seems to be that I'm to stupid to use gdal_grid. I' have file called dgm-10-epsg-32633.csv with equidistant samples 10x10m in this form. X,Y,Z 386700,6068670.000,.000 ...
2
votes
1answer
79 views

Difference between osgeo gdal/ogr python module and GDAL C++ library

I am developing application in python and I use the osgeo gdal/ogr python bindings for gdal, but its not clear to me what exactly is the difference between the gdal/ogr in python and the gdal library ...
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1answer
39 views

MODIS resolution missmatch between MRT and GDAL processing

I've been using MRT (Modis Reprojectin tool) to extract EVI bands into a geotiff with geographic coordinates (epsg4326). I did not specify an output resolution to MRT. The output from MRT had a ...
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1answer
197 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 ...
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1answer
39 views

Write single lon/lat coordinates in TIFF with GDAL

Is there a way to write the georeferentiation value by value in a tiff file using GDAL?
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21 views

Installing GDAL with HDF4 driver on Debian system

I am working on a Debian 7 Wheezy system using Anaconda and working from Spyder. I've had a hard time installing a version of GDAL that reads HDF4 drivers. Could someone walk me through the ...
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2answers
94 views

GDAL HDF4 Driver on Linux System

I'm running code that works with MODIS HDF4 datasets on a Debian Linux distribution. I am also running this code on a Windows machine. On both the Windows and the Linux machines, I have the most ...
2
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0answers
165 views

Why are OGR (MySQL / PostGIS) connections extremely slow in QGIS 2.0 - 2.8 (when compared to QGIS 1.8)?

In our project we have been using QGIS 1.8 Lisboa with a MySQL database placed on a server accessed via local network since two years. Everything is working fine and quick. The vector layers can be ...
3
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2answers
233 views

GDAL in C++: Reading a ShapeFile

I am trying to use the GDAL Lib to read a ShapeFile (.shp). I followed the instructions of http://www.gdal.org/ogr_apitut.html - But it doesn't work! #include <gdal_priv.h> #include ...
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2answers
34 views

Converting in batch into 8 unsigned bit format using GDAL?

Could you please correct my batch command? I had 100 img images which need to be converted into 8 unsigned bit format for further use in TIMESAT. mkdir test for %%f in (*.img) do gdal_translate ...
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2answers
123 views

How to crop Geotiff image in C++ (GDAL or other possibilities)?

I am developing a code to process a geotiff image. But firsly I need to crop a geotiff image preserving its metadata (projection...) in C++. My idea it's to provide the corners and the geotiff image ...
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2answers
78 views

GDAL - Warping raster to new domain/resolution/projection causes data loss

I am attempting to warp a GTiff from a lat/lon projection to a higher (~2x) resolution Polar Stereographic grid. In the output GTiff any cells north of 64 deg lat become NaN instead of their actual ...
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1answer
73 views

Python GDAL: Rasterising point data, raster and points are not geolocated

I am trying to rasterise some point data using Python GDAL module. But when I plot the data there is an offset between the two (original points and raster). I am sure it has to do with the ...
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3answers
166 views

GDAL: How to replace NaN pixel values in GeoTIFF

I was wondering if there is a easy way (GDAL) to replace GeoTIFF pixels that are -nan with a different value (e.g. 100)? I tried gdal_calc.py -A my.tif --outfile=result.tif ...
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2answers
84 views

[GDAL API]: can't save image in some formats

edited "32-bit buffer" below means that it contains 32-bit rgba pixels. I need to save image to file from 32-bit memory buffer. Code below works well for that when I use TIFF format. In this case ...
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40 views

java gdal.jar version 1.10.1 and osmconf.ini question

Does anyone have any info on how to configure this osmconf.ini text file? I use the gdal.jar (version 1.10.1) to open an .osm (xml) (ex. ogr.Open(filename, false)). I could get the 5 Layer objects ...
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0answers
19 views

Can I export overview with gdal?

How can I export overview for example 1/4 from the orginal raster map to a geotiff file using gdal?