Tagged Questions

0
votes
1answer
97 views

CSV and GDAL 1.10 in QGIS

It seems the GDAL upgrade from 1.9 to 1.10 changed the way CSV files are handled so that I now have a non-functioning QGIS. App hangs trying to import csv data file when previously had no problems ...
0
votes
0answers
15 views

How to correctly create virtual catalog from rasters with overlapping alpha band in QGIS?

I'm trying to make a mosaic (and then a pyramid) of historic map tiles. Every map tile has a border, I got rid of it with gdalwarp (adding an alpha band and specifying the border, as I stated here). ...
0
votes
0answers
28 views

QGIS GDAL polygonize - how to set scale

I've got some old contour plots, paper copy only, that I'd like to be able to put into QGIS. I get as far as a successful polygonize into shp and it looks fine, but the scale is wrong. How might I ...
0
votes
0answers
19 views

Change offset of geotiff file [migrated]

I need to change the offset of some tiff files that I am exporting from Qgis. Qgis gives them a offset of 0xbd72, while the program I need to load them in to only reades files with an offset of ...
0
votes
1answer
103 views

Any Open source georeferencing library? [closed]

I am using VS 2010, and I want to see is there any open source (preferably c++) library that can be used for georeferencing? I came across GDAL and QGIS, but I have the hardest time to get them ...
0
votes
1answer
96 views

How to clip raster by multiple polygons in multi rasters?

Using QGIS, I want to clip a raster by multiple polygons contained in a single shapefile. I read that gdalwarp can clip my raster by multiple polygons BUT the output is a single merged clipped raster. ...
3
votes
1answer
49 views

Differences in raster extents in gdalinfo, SAGA & Quantum after resampling

I recently resampled a raster file using SAGA's Resampling module. The aim was to widen the extent of the new raster to two decimal places, where the original raster has three decimal places. The ...
0
votes
1answer
80 views

QGIS can't find osgeo after GDAL upgrade

Mac OS 10.6.8: I installed QGIS 1.8.0 with GDAL 1.8; then another app requires GDAL 1.9 and installed it; now QGIS can't find osgeo [python-gdal]. (I can't find any trace of GDAL 1.8 left in my ...
1
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 ...
6
votes
1answer
107 views

ISIS to GDAL to QGIS: Georeferencing Mars Images

I'm trying to use QGIS to view some images from the Mars Reconnaissance Orbiter Context Camera. I use ISIS3 to download the images and convert them to mapped .cub files, following the instructions ...
1
vote
1answer
146 views

Rasterize vector with gdal

"I would like to calculate the Euclidian distance from a residence to a public service of interest e.g. the distance from a residence to a green space (as the crow flies) in QGIS. After browsing the ...
0
votes
1answer
47 views

gdal_contour creates an empty shapefile

I am running: gdal_contour -a elev hazard_interp4.asc haz_ak_contour_4_10 -i 10 the hazard_interp4.asc file has values in band 1 (singel band gray). With the above command, I get a shapefile that ...
0
votes
1answer
37 views

gdalwarp cant find libproj.dlib

Thought I had finally got Python, gdal and QGIS to play nicely together but just tried to do a batch transform using a bash script to call gdalwarp and it claimed it couldn't read the libproj.dlib ...
1
vote
2answers
98 views

ESRI State Plane Coordinates as EPSG

I am working with some State Plane projections from Colorado. I have looked them up on spatialreference.org and they are the following: ESRI:102254: NAD 1983 HARN StatePlane Colorado Central FIPS ...
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?
2
votes
1answer
55 views

How to interpret the OSGeo4w software version under Advanced Install option?

When choosing to install QGIS Desktop using the OSGeo4w advanced install option, I noticed that there are what looks like ambiguous software versions to choose. For example, currently QGIS Desktop ...
0
votes
1answer
50 views

Should a GDAL Plugin be the same version as GDAL aready built into QGIS

Should a GDAL Plugin be the same version as the GDAL that's aready built into the QGIS version installed? Or,can another different version of GDAL be built and it installed as a Plugin for QGIS, ...
3
votes
4answers
388 views

Batch processing DEM rasters in QGIS/GDAL

I am attempting to add relief shading to map using .asc raster files, following this tutorial. It works well, but I have only tried it on single tile of raster data which is 20x20km. I want to ...
3
votes
0answers
152 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 ...
5
votes
2answers
242 views

Where can the GDAL executables be found in a QGIS installation?

I run QGIS 1.8.0 Lisboa on a Windows 7 machine. Yesterday I attempted to install the TauDEM plugin using these instructions: http://lists.osgeo.org/pipermail/qgis-developer/2012-June/020807.html ...
0
votes
0answers
121 views

OGR-Driver GML axis order handling (GDAL, QGIS)

By default the OGR-Driver will swap the axis order to longitude, latitude for geographic coordinate systems. "Since OGR 1.8.0, the GML driver has coordinate system support. This is only reported ...
8
votes
2answers
237 views

What to do with -3.4e+38 nodata values?

I am trying to process some bioclimatic raster files, such as can be downloaded from http://www.worldclim.org/current (bioclim set). They seem to have nodata values set to -3.4e+38 according to QGIS ...
1
vote
1answer
272 views

“Please ensure that the GDAL_DATA environment variable is set and try again” on Kubuntu 12.10

I'm having a problem loading the 'convert os gml to ogr' plugin in QGIS 1.8 running on (k)ubuntu 12.10. Basically, clicking the plugin prompts the error: "Please ensure that the GDAL_DATA ...
6
votes
3answers
567 views

How to extract slope from topographic raster map?

I am working on a project for a machine learning class wherein I extract features from a topographic raster map and then classify the traversability of the terrain. One of the features I need to ...
3
votes
2answers
173 views

set geotiff 0 values to nodata

Is there a way to set all the 0 value pixels on a raster to nodata using gdal or qgis?I world like to use fillnodata to fill some holes, but holes are set to 0,so I need to delete them first
1
vote
2answers
106 views

error message when clipping raster with vector layer

When I try to crop a raster using QGIS Clipper tool, I get the following error message: ERROR 1: Attempt to create 0x0 dataset is illegal,sizes must be larger than zero.. Why? The code QGIS generated ...
1
vote
1answer
337 views

DLL load error with Gdal polygonize in QGIS 1.8 (windows 7) [duplicate]

Possible Duplicate: Qgis polygonize problem - DLL load fail [I had already posted this question, but was closed and redirected to a supposedly duplicate question. I'm re-posting since I ...
1
vote
0answers
123 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 ...
3
votes
2answers
108 views

How can I create a portable script for coordinate conversions to run from USB?

I would like to be able to convert Lat long values in wgs84 to the swedish RT90, the values are in CSV files under headings X and Y. I would like to have this portable, an eg runned in a script in ...
3
votes
1answer
125 views

Error Installing libgdal1 Package

I'm trying to install the libgdal1 package on Ubuntu 12.04, but the apt is returing this error: dpkg: error processing /var/cache/apt/archives/libgdal1_1.9.1-2~precise4_amd64.deb (--unpack): ...
1
vote
1answer
134 views

Tools to flatten the jp2 to a single band (average the bands)?

I have created thousands of png tiles using arcgis and have merged groups of them into large jp2 files for serving via geoserver. I need to flatten these to a single band so that I can apply a colour ...
2
votes
1answer
429 views

GEOS and Shapely installation on Windows

When trying to install Shapely on my Windows 64bit computer, I cannot get the GEOS library to work. So far, I have run the OSGeo4W installer from which I installed GDAL (I believe the geos library ...
3
votes
2answers
543 views

Shape-file encoding problem in QGIS 1.9.0 (built with GDAL 1.9.2)

I have googled a lot but failed to find the answer. My configuration is: Ubuntu 11.10 Quantum GIS - 1.9.0-Master 'Master' (caae7b7) GDAL 1.9.2, released 2012/10/08 Shape-files refuse to open in ...
0
votes
1answer
190 views

Converting arcpy based python script to OGR for semi-automated Metadata creation

I have created a script to automatically generate base ANZLIC standard metadata using arcpy based coding. Can anyone help me convert it to OGR/GDAL python? This is so that it can be run in QGIS and ...
1
vote
1answer
205 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 ...
0
votes
0answers
16 views

Merging rasters in QGIS- Load DLL error [duplicate]

Possible Duplicate: merge raster images: error message procedure not found When I try to merge rasters (geotiffs) in QGIS 1.8 using the merge tool (Raster-> Miscellaneous -> Merge), I get ...
2
votes
2answers
618 views

Adding georeferencing data into tiff image

I want to create a georeferenced .tiff file from a .png file. So I convert the .png into a normal .tiff file using the following command line : convert image.png image.tiff Here, all works fine, I ...
2
votes
1answer
333 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, ...
2
votes
1answer
501 views

Qgis - How to change GDAL version

im working on Ubuntu 12.04 server; i noticed this when i installed additional support for ECW format into the GDAL 1.9.1 which worked ok. Then i tried to add ECW files to Qgis but it said they still ...
2
votes
1answer
407 views

GDAL VRT Format - do i understand the concept?

Okay, so im a little fed up with different raster-in-database solutions that I tried over the last 2 weeks which don't work currently (Postgis raster) or cant handle my volume of data (Rasterlite), so ...
2
votes
1answer
265 views

How to manage null values in QGIS

I made a merge of several AsterGdem blocks near Egypt and Israel. I have portions of the Dead and Mediterranean Seas. Since near Galilea elevations are below sea level this makes the following problem ...
1
vote
2answers
648 views

Clean way to install gdaltools plugin for QGIS on OSX

I have qgis 1.8.0 on osx mountain lion and am installing the gdaltools 1.2.29. I have run into a problem that a number of people are seeing. The plugin cannot find my gdal python (see below). ...
3
votes
1answer
132 views

Projecting GCP points into translated file

I have file A.png and file B.png. I translate file A.png so i could translate it into B.png (creating multilayer file). Is there any easy way to get new GCP points coordinates so i could combine those ...
2
votes
2answers
293 views

Using osgeo modules in ArcGIS10.1 and QGIS 1.8 python shells

This is related to an old question of mine - Issues with osgeo - qgis.core and arcpy modules Now in new versions of all the software QGIS Lisboa (1.8), ArcGIS 10.1 and pyScripter 2.5.3. They all use ...
0
votes
1answer
187 views

Vector boundary generation -similar to Image Boundary

I want to automate the creation of boundary polygons from vector files. This is not footprint or extent creation (I already have scripts to do this). I want to create a tool similar to the QGIS, Image ...
1
vote
2answers
499 views

GDAL does ECW but QGIS (Linux !!) does not load ECW file

Followed instructions from various posts (each one with slight variations on the theme) and most of the time have no trouble getting the installed GDAL to accept ECW files. However, QGIS stubbornly ...
1
vote
1answer
238 views

Qgis install can't find Gdal framework (Mac OS X 10.7)

After having installed Mac OS X 10.7 I can't install Quantum Gis as it maintains that I have not installe the GDAL Framework, which I have done (several times). Have anyone experienced the same ...
2
votes
1answer
515 views

SID and/or ECW support on QGIS for Linux

Running QGIS on Ubuntu 11.04 and QGIS for Android on Galaxy Tab 10.1 (which is an awesome project by the way) NEED to figure out a way to get SID and/or ECW files loaded. Saw some posts about ...
2
votes
1answer
713 views

Convert area from square meters to degrees globally

I have a global raster file with 3600x1800 pixels. I don't have any information about the projection used. The raster contains one band with a quantity with the unit "per square meter". How can I ...
0
votes
0answers
636 views

Oracle Spatial connection : gdalplugins 1.8 and Quantum GIS

I am wondering what's going on behind the scenes in the gdalplugins for Oracle Spatial: gdal_GEOR.dll and ogr_OCI.dll. I assume MDSYS.ALL_SDO_GEOM_METADATA and MDSYS.ALL_SDO_INDEX_INFO are read ? ...

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