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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2
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1answer
691 views

Cannot replicate gdaltransform example

In the description of gdaltransform this example is given: gdaltransform -s_srs EPSG:28992 -t_srs EPSG:31370 177502 311865 Produces the following output in meters in the "Belge 1972 / Belgian ...
1
vote
1answer
296 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 ...
7
votes
1answer
548 views

What are the rules that the Gdal rasterize function follows to allocate a value to a cell?

How does the rasterize tool decide which value to represent when a cell covers an area which inclueds different values? I need it in this case for polygons but would like to know for lines and points ...
2
votes
2answers
1k views

How to create proper PostGIS points out of GRIB2 file?

I'm trying to load NCEP NOAA weather data from GRIB2 format into PostGIS and then visualize it using QGIS etc. I'm using wgrib2 library to convert the GRIB2 data to csv first. wgrib2 -match ...
4
votes
2answers
1k views

How to style a GeoTIFF in Tilemill?

I'm trying to create a "heatmap" style visualization from a number of geopoints and values associated with them. I have been following along with this blog post. I've got a CSV file of points like ...
0
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0answers
254 views

QGIS GDAL integration of new version [duplicate]

Somewhere else on this forum ("How to access file geodatabase in Qgis?") someone asked how to access data from an Esri file geodatabase in Quantum GIS? One of the answers pointed 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 ...
5
votes
4answers
2k views

Create a ground overlay kml from georeferenced raster

I have a world georeferenced raster (5m resolution, ~4000 x 4000 pixels) that I would like to display in google earth. I am looking for a simple and effective way to generate this kml file. Using ...
1
vote
3answers
689 views

Geoserver - ImagePyramid plugin problem

I have a huge Geotiff file , and i've tiled it .. I've created the tiles using gdal_retile.py tool , but i'm getting the following error from Geoserver while linking the layer with the tiles folder : ...
3
votes
2answers
710 views

Can I create blended images with GDAL command line utilities?

I've written a program in Python with GDAL bindings that generates a single band georeferenced GeoTIFF as output. From there I use the GDAL commandline tool gdaldem to colorize that image to ...
9
votes
7answers
3k 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 ...
9
votes
7answers
3k views

how to overlay shapefile and raster?

I have a shapefile with polygons. And I have a global raster file. I want to overlay the shapefile's polygons onto the raster grid and calculate the mean raster value for each polygon. How can I do ...
0
votes
1answer
228 views

requesting tiles without using xml file (gdal - c++)

i have been able to request a specific tile with my xml through gdal lib. However, is there is another way of requesting the tiles from a web server without using xml ? i wanna do it directly through ...
2
votes
1answer
864 views

How do I change a raster's geotransform with GDAL?

I'm trying to use GDAL to set the geotransform of a new raster that I've created by following the steps outlined in the GDAL API Tutorial. # create the new dataset driver = ...
12
votes
3answers
14k 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 ...
2
votes
1answer
263 views

Why doesn't Gdaladdo make the background transparent?

I noticed that the backgrounds of my geotiffs were transparent up until I started added overviews with gdaladdo. Is there a way to combat this?`
3
votes
1answer
802 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?
1
vote
1answer
440 views

GDAL Brightness RGB Contrast Gamma Saturation

I've not had much experience with modifying imagery, I've recently been playing with GDAL for some batch processing of geo-referenced images, I've been supplied with some imagery in ECW format that is ...
1
vote
2answers
3k views

Georeferencing an image in C# with GDAL

I want to upload a jpeg or some raster image into a C# form and then on entering the latitude and longitudes I need to be able to create an GEOTIFF file of the same image. How can this be done in ...
0
votes
1answer
3k views

How can I convert SRTM data to DEM or DTED?

i am working on a project which is not commercial and i need some digital elevation data for visualization. in net i have found a link and i have downloaded .asc data from following link.. SRTM Data ...
2
votes
2answers
947 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 ...
1
vote
1answer
451 views

Getting geotiff information into variables, not files, using gdal_translate, gdalinfo

I received an excellent answer to my question of how to get the lat/lon coordinates of the corners of a geotiff file. I used gdalinfo. The lat/lon info comes out into a file. Similarly I turned the ...
2
votes
1answer
507 views

Finding lat/lon of corners of geotiff file

I am a GIS newbie. I just recently managed to turn a GeoTIFF file into a bmp file using gdal_translate. Now I need to find the latitude/longitude coordinates of the corners. I would prefer to use ...
2
votes
2answers
407 views

Convert HMR to GeoTiff

I've got gigs of .hmr raster files from our customer and I need them to be converted into GeoTiffs or something else which can be nicely imported into Geoserver system. I wonder if I can do it with ...
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 ...
6
votes
0answers
318 views

How to store Large Raster Images of Equipotential Surface Generation Using Monte Carlo Simulation?

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 observation is ...
4
votes
2answers
2k views

How to remove black edges on georeferenced images with gdal

after an image has been georeferenced the transformation creates black edges. How could I set these to white instead of black using gdal? would I have to somehow create a colour table and set nodata ...
1
vote
0answers
140 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 ...
3
votes
1answer
162 views

rgb2pct.py increases size of file 20 fold!

I wanted to reduce the number of bands of a tif file from 3 to 1... I used this command rgb2pct.py -n 256 fnp_braunschweig.tif fnp_bs.tif and it increased the size from 31mb to 778mb I actually ...
8
votes
3answers
2k views

Poor image quality of raster pyramid files in ArcGIS Desktop (no anti-aliasing)?

There are several GeoTIFF files (size ~7000x7000 px) which I try to open in ArcGIS Desktop 10.0. I have already created raster pyramids for them (.ovr files) using geoprocessing tool but their quality ...
1
vote
1answer
504 views

Gdal tiling error for EPSG: 3857

i have lots of data which was coordinated with gdal some programatic way at below: gdal_translate -of GTiff -a_ullr %s %s %s %s -a_srs EPSG:3857 %s/%s %s/%s.tif then for tiling them all i am ...
2
votes
2answers
694 views

How to install GDAL with TIFF support on Linux?

I am trying to install GDAL on a linux machine and tested some sample commands like gdalinfo --version This worked fine, but when I started working with images like .tif I got the following error . ...
1
vote
2answers
2k views

How to convert GeoTIFF to grayscale and add gaussian blur?

I have a giant GeoTIFF I'd like to convert to grayscale and add a gaussian blur to. As far as I know, GDAL can strip two of the three color bands and call it grayscale, which might work, but is there ...
2
votes
1answer
431 views

Converting x, y, zoom for Calculating tile bounds

i am working on calculating tile bounds lat lon from x,y,z tile coordinate. i have looked gdal2tiles code structure and i have found this good function: def TileLatLonBounds( tx, ty, zoom ): "Returns ...
13
votes
2answers
5k views

API documentation for Gdal/Ogr with C#

I want to assign projection to shapefile in my web C# application, for this i am using Gdal/OGR/OSR C# bindings and add osr_csharp.dll and ogr_csharp.dll references. But i am facing some difficulty ...
2
votes
0answers
58 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 ...
2
votes
2answers
400 views

gdal_polygonize error with Arc/Info binary grid raster file

I am trying to convert an Arc/Info binary grid raster file to a shapefile using the gdal_polygonize.py utility. But the operation fails with the following error Warning 1: Unsupported Arc/Info ...
0
votes
1answer
455 views

Gdal2Tiles getting tif with dtype = uint8 but want int16

I have a gdal2tiles code for getting tiff file. In my code I am getting true tiff format but it makes my dype uint8. I want int16 for dtype. how can I overcome it? I know I have to add gdal.GDT_Int16 ...
2
votes
1answer
4k 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 ...
5
votes
1answer
399 views

What is the best way to prepare digital orthophotos for the web?

My system: Linux Ubuntu 10.04 server (100gb: 4gb RAM: 32bit) /tomcat6/geoserver/geowebcache/FWTools My Objective: Create Aerial Photo coverage in ETRS89 N32 My Data: 1300 3 band Orthophotos in Tif ...
1
vote
1answer
681 views

Convert MGRS using gdaltransform

I'm using gdaltransform to convert coordinates. What's the best way to convert MGRS using gdaltransform given that it doesn't have an EPSG code?
2
votes
0answers
550 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 ...
4
votes
2answers
384 views

How to import GDAL in Jython?

I'm trying to use jython with GDAL on Windows. Python and GDAL are installed through MS4W and work perfectly together. Jython is installed manually, but I can not import GDAL. I tried to update ...
1
vote
1answer
263 views

GDAL Tiling, Missing Tiles

i have used gdal2tiles.py for tiling about 100 tiff tiles which i have generated virtual dataset with gdalbuildvrt for my 1:250.000 scaled maps... everything goes well from 15 to 11, but when it ...
0
votes
1answer
1k views

gdal2tiles format of argument for the '--srcnodata' flag

When you run gdal2tiles, by default it sets pixels outside your map area to black-transparent. I would like to set them to white opaque. Looking at the documentation... ...
3
votes
2answers
1k views

How to fix for the GDAL clipper tool in QGIS?

I would like to clip a DEM with an admin boundary using qgis, in order to calculate a measure of variation. However, when I use the Raster clipper tools and select mask, I get the error message: "An ...
21
votes
1answer
2k views

Can 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 ...
2
votes
1answer
188 views

Define gdalwarp tile size

gdalwarp has -co TILES=YES (256x256 as default) Can I set different tile size? Thanks
3
votes
1answer
775 views

overlap two GeoTiffs to fill missing information (transparency)

I have several hundered geotiff files. Some of them (almost all of them) have black areas (irregular) on the edges. However, these black areas are covered by some other file in the file set. I read ...
3
votes
2answers
1k views

ImageMagick's convert program changes PNG file format so that color/alpha info doesn't survive GDAL

It appears that ImageMagick's convert program changes something in my PNG file that causes GDAL processing to mess up the color and/or transparency bands. My original PNG file gets processed ...