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.
5
votes
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92 views
How to detect a GDAL/OGR 'Warning'?
When I run a batch script using a GDAL/OGR program, I can detect if an error occured by checking ERRORLEVEL for the value 1.
When using GDAL/OGR in python or .NET, I get an exception when an error ...
5
votes
0answers
803 views
How to create a 4096x4096 png from a 1440x720 data set using GDAL?
I'm having a bear of a time trying to do something that seems fairly straightforward. I'm trying to take a netcdf file from ftp://eclipse.ncdc.noaa.gov/pub/OI-daily-v2/NetCDF/2011/AVHRR-AMSR/ and turn ...
3
votes
0answers
75 views
Build Raster Attribute Table with GDAL Utilities
Is there a way to build a raster attribute table using one of the GDAL utilities? I know you can view it using gdalinfo and I have successfully created one using Python, but it would be so much ...
3
votes
0answers
159 views
Polygonize vegetation area from Landsat7 RGB using QGis / Bilko?
I'm trying to extract the areas with vegetation as a polygon-shape from a landsat7-image, 30m resolution, RGB, using QGis 1.8 or Bilko or (hopefully in the near future) ArcGIS. The area is in Northern ...
3
votes
0answers
122 views
Bug in gdalwarp's simple nearest neighbor? Or more likely I need some help
I'm trying to understand how to use the GDAL utilities a little better. I think I've defined something incorrectly or I've found a bug in gdalwarp. My bet is that I've defined something incorrectly, ...
3
votes
0answers
254 views
How to create mask bands in GDAL and Python?
I have small program in Python that uses gdal and numpy to perform a logarithmic scale of some data into the RGB 0-255 range.
Now this input data has a nodata value set to mask the valid values, and ...
3
votes
0answers
179 views
How to save table from PostgreSQL to MapInfo File?
I have two tables:
1 with geometry in WGS
2 with geometry in Local System
I tried this:
ogr2ogr -f "MapInfo File" output2.tab PG:"host=localhost user=postgres password=123456 dbname=postgis" -sql ...
3
votes
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158 views
Equipotential Surface Generation Using Monte Carlo Simulation on Large Raster Images
All,
I have a large (1GB+) raster that I am using as the base for the generation of an equipotential surface. This is to assess the accuracy of DEMs derived from another source. In situ ...
2
votes
0answers
66 views
Why do I get different output from gdal2tiles vs. maptiler?
I am trying to generate map tiles using gdal2tiles for an area much larger than MapTiler can handle. However, my tile caches are not showing up on the maps. I checked gdal2tiles by running the same ...
2
votes
0answers
28 views
efficiently slicing tiles with gdal C API
Im working a project using the gdal C api(in a block of objective-c) to slice TMS style png tiles. The code currently works, but I'm running into some trouble optimizing to run fast enough for use on ...
2
votes
0answers
56 views
How to create raster attribute table to a raster data using gdal python?
I classified a remote sensing data and saved it as a raster using Gdal python. I want to create a raster attribute table for this classified result.. my classified raster has five classes with ...
2
votes
0answers
137 views
Problem converting georeferenced jpgs to geotiff - image is shifted/warped
I have hundreds of georeferenced jpgs in ArcGIS 10 that I need to convert to geotiffs.
I'm trying to use GDAL translate to create geotiffs from them. Everything works great except that the ...
2
votes
0answers
228 views
gdal ImportError in python on Windows
Trying to import gdal for Python 2.7.3 on Windows XP:
>>> import gdal
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File ...
2
votes
0answers
83 views
projection discrepancy with gdal (1.9) and proj4
I boiled the problem down to that python example:
import sys
try:
from osgeo import gdal
from osgeo import osr
except:
import gdal
import osr
if __name__ == '__main__':
version_num = ...
2
votes
0answers
80 views
Localized Linear Histogram Match using python
I would like to use the local linear histogram match for filling the missing pixels of a Landsat 7 image with another older image (SLC Gap-Filled Products).
Do you have any idea how can I do it by ...
2
votes
0answers
143 views
Image Pyramid + Geoserver + Google Earth slow with errors
I have hundreds of GB of somewhat small tif files. Here is gdalinfo of one of them:
F:\gis\geotiffs>gdalinfo finaloutputSSAM211Jun181306hfwaterfall0.tif
Driver: GTiff/GeoTIFF
Files: ...
2
votes
0answers
198 views
How to read Geotiff tags and pixel per pixel values using GDAL C#
I'm new here and I'm new at programing with GDAL C#.
My question is how I can get the value of SRTM GEOTIFF pixel to compare with it's neighbors, and how can I get the values of Geotiff tags.
2
votes
0answers
118 views
How do I use scipy.ndimage.gaussian_filter1d on an arbitrary axis?
I have a GDAL raster that looks like this:
And I would really like to blur this raster along an arbitrary transect.
I see that scipy.ndimage has a gaussian filter that allows me to blur the raster ...
2
votes
0answers
208 views
How to compile GDAL with HDF4? (for dummies)
I need GDAL with both Shapefile and HDF4-Support, if possible in 64 bit.
Since the normal GDAL-versions from http://www.gisinternals.com/sdk/ have Shapefile, but no HDF4 and the version from FWTools
...
2
votes
0answers
313 views
GDAL tiling DTED (dt2) dataset as gdal2tiles for 3D Maps
i am searching some webgl technologies to create 3d map with digital elevation data. for web tech. i have found ReadyMap SDK to create 3d map from TMS...
in ReadyMap for elevation data it uses sth ...
1
vote
0answers
10 views
GDAL Plugin with a different version of GDAL aready built into QGIS
My qgis windows version is 1.8.0 Lisboa and use the gdaltools in version1.9.2.
I want to use the plugin NetCDFBrowser, but this plugin need the gdal 1.10.
I install 1.10 stand-alone gdal find here ...
1
vote
0answers
48 views
Using gdal to convert from UTM to equidistant lat/lon
I am getting rather confused with converting a UTM gridded dataset into a equidistant/rectangular latlon gridded dataset. Can anybody help me?
I have a UTM set with the following projection:
...
1
vote
0answers
43 views
How can I call gdal_translate from Java code?
How can I execute gdal_translate in Java? For example, will something like this work?
gdal_translate "PG:host=localhost dbname='xyzy' schema=public' table='xyz'" "d:\xyx\ab.tiff"
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vote
0answers
40 views
Normalize with gdal_translate
I do not understand the command line when I try to work with gdal_translate in QGIS. I found this at the forum: Normalize raster values to 0-255
And tried this:
*"If not, from within QGIS choose ...
1
vote
0answers
43 views
How can I fix badly specified geographic coordinate system with units in arc-seconds?
Check out this depth-to-rock soil data. It is linked from here. The spatial reference system is a latlon, but the units are arcseconds. I could not reason out how to override the SRS even after ...
1
vote
0answers
107 views
Question about geotiffs
My colleague and I are georeferencing a bunch of .tif images. After each image, we'll click "update georeferencing". The resultant .tif files are different between our computers and I'm trying to ...
1
vote
0answers
78 views
Are there limitations with gdal virtual raster option?
I am new at Postgis and I'm groping...
I pretend to rasterize some weighty vector layers in Postgis, do some map algebra and reclassification with them and visualize intermediate as well as final ...
1
vote
0answers
49 views
Coarse heat map placement using gdal
I have generated a coarse heatmap of where data is available by 1 degree x 1 degree cells that I want to overlay on top of a world image. Using a python script I merged two images (heat map and a ...
1
vote
0answers
26 views
How do I link an existing install of GDAL to FileGDB in Linux?
The distribution I use (CentOS) only has GDAL 1.8 available through elgis. I've downloaded the FileGDB API from ESRI and I'd like to be able to link it after an install. How can I do this?
1
vote
0answers
50 views
gdal_grid failing to set nodata
Using gdal_grid for spatial interpolation I have run across a problem: the nodata argument is ignored. The only solution I have found for this is to then use gdal_translate but it is rather cumbersome ...
1
vote
0answers
52 views
How I can incorporate results of histogram stretching into georeferenced image?
I have one channel 8 bit raster and when I open it in QGIS with histogram stretching "on the fly" it looks fine. How I can recalculate original raster accordingly changed histogram?
1
vote
0answers
103 views
How to use GDAL to burn a selected value from one raster into another?
I think this should be a relatively simple process, but I'm not quite sure how to approach it.
I have a shapefile containing 1000's of polygons. I also have 19 rasters. All of the polygons fall ...
1
vote
0answers
75 views
OSGB36 referenced PNG to Google Earth
I am creating a PNG that is referenced to the OSGB36 datum (1 pixel per 50m easting/northing that is colored according to the result of some calculation code)
I want to display this on Google Earth ...
1
vote
0answers
36 views
Size of output geotiff file not as in the .vrt file
I have the following vrt file (input.vrt) with GCPs in EPSG:3857
<VRTDataset rasterXSize="5409" rasterYSize="5408">
<Metadata />
<Metadata domain="IMAGE_STRUCTURE">
<MDI ...
1
vote
0answers
50 views
VSIMalloc3() and UnifiedSrcDensity mask errors when running gdal_warp in OSGEO4w shell
This is related to gdal.py as part of bat script in windows 7
I am getting
ERROR 2: VSIMalloc3(): Out of memory allocating 854522136 bytes.
ERROR 2: Out of memory allocating 119813400 bytes ...
1
vote
0answers
56 views
resampling errors
I have to reproject my images, but it contains some resampling errors. Any one has any idea on significance of resampling error. Are they neglectable? Is there any good documentation to refer to? I'll ...
1
vote
0answers
125 views
How to use the OGR/GDAL configure options in QGIS python environment
I’m looking for a solution how to use the OGR/GDAL configure options (--config) in the qgis python environment. http://trac.osgeo.org/gdal/wiki/ConfigOptions
Setting special configure options is ...
1
vote
0answers
83 views
How can I add all the 4 corners as GCP in an image that I want to reproject?
I am working on a Modis - oceancolor image and I want to reproject it to wgs84. I have the Upper left/right and Low left/right values from the metadata of the image and I want to add them all in the ...
1
vote
0answers
55 views
Create 6 band IMG file with GDAL out of two JPG files, one with WorldFile coordinates
I have two JPG files
1 ortomap: http://imageshack.us/photo/my-images/703/ortofoto1.jpg/
with WorldFile:
0.683772574816354
0.000000000000000
0.000000000000000
-0.683739485024190
...
1
vote
0answers
64 views
`gdalbuildvrt` and selecting individual bands
I want to produce a set of VRTs (GDAL's internal virtual rasters) that comprise a re-arrangement of bands of a number of individual GeoTIFF files. Say I have my initial set of GeTIFF files, all having ...
1
vote
0answers
52 views
Calculating tiles extents using some level data
I have some data looking like this:
<?xml version="1.0" encoding="utf-8"?>
<levels>
<level nr="0" tileWidth="512" tileHeight="512" envSizeX="5000" envSizeY="5000" minX="465000" ...
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0answers
151 views
Homebrew GDAL installation ECW or MrSID
I have experimented with installing gdal 1.9.1 via homebrew. It works wonderfully. Unfortunately, their is no real JP2000 support. I realize that JP2000 is supported by OpenJp2000, but that ...
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vote
0answers
103 views
gdallocationinfo from C++?
I need a C++ API to convert x,y Image Coordinates in their native projection to output image pixel,line coordnates. I see the gdallocationinfo documentation, but no API for it.
Where in online GDAL ...
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vote
0answers
158 views
Is there any support for Rasterlite in the Android QGIS?
Is there any support for Rasterlite databases in the Android port of QGIS?
I have tried adding a raster layer as I would on desktop QGIS but there are fewer GDAL file formats listed.
Is this ...
1
vote
0answers
94 views
Is Django's LayerMapping capable of putting a static value into all features?
I'm using GeoDjango's LayerMapping utility to try and import a set of features. The catch is that aside from the attributes in the source layer, I want all the destination features to have the same ...
1
vote
0answers
45 views
Tiled image transforming to new profile
i have a set of tile which was tiled profile of mercator and proper to tms scheme mechanism.
unfortunately i dont have any tif or georeference table or anything for this. all was tiled with mercator ...
1
vote
0answers
218 views
ValueError when reading a raster band as a numpy array
Here's the problem shown in Python shell:
In [32]: from osgeo import gdal
In [33]: geotiff = '/Users/calvin/work/luc/proj_public/media/GLO
...
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vote
0answers
123 views
Tilecache positions my gdal_translated map 20km south of where I want it
I have created a geotiff file through gdal_translate:
gdal_translate -a_ullr 547812.2384341886 6834734.336439242 547967.5011478929 6834622.35081697 -a_srs EPSG:900913 pdz3.jpg pdz.tif
When I load ...
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vote
0answers
111 views
Geoserver Custom CRS IAU_Moon_2000
I am trying to setup a custom basemap using a GTiff in the IAU's Moon2000 projection (30100 or 30101). The basemap image was originally created through gdal_merge and gdalinfo returns the expected, ...
0
votes
0answers
16 views
Getting started with gdal/ogr
I found some batch code using ogr2ogr in order to convert and reproject vector layers. The difficulty for me is to know what to install and which gdal commandline should I use, and how to configure ...
