2
votes
2answers
49 views

Can GDAL fill elevation below a certain value?

I have several GeoTIFFs that I'm working with to create contours using gdal_contour. One of them crashes the utility. gdalinfo tells me that the computed min values for band 1 and 2 are ...
2
votes
2answers
105 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 ...
1
vote
1answer
29 views

How can I fix a broken gdal-tools plugin in QGIS?

I have QGIS installed on my 2011 macbook pro and I recently upgraded my OS to 10.9. After the upgrade, I noticed that QGIS gives me this error (see attachment 1) saying that the plugin is not ...
1
vote
1answer
56 views

qgis polygonize error 4 “file does not exist in the file system”

When I try to convert a raster DEM (in asc or geotif format) to polygons I get the error below. ERROR 4: `Y:/GIS/oversvmmelser/tmp/out.tif' does not exist in the file system, and is not recognised ...
2
votes
1answer
32 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
60 views

Trying to install QGIS - missing 1.11 GDAL

I just spent the last n hours working on this, and still haven't gotten anywhere, so I'll throw it to the group. I see that other people have asked about this here and here, and I'd be happy to take ...
0
votes
1answer
68 views

Conflicts while installing postgresql9.3-postgis2.1,QGIS and gdal-bin

I want to use postgresql9.3-postgis2.1 and gdal-bin parallel . I have refer instruction here for installing postgresql-9.3 on ubuntu 12.04. I have install qgis from here While installing gdal-bin it ...
0
votes
1answer
28 views

Gdal_sieve not working?

I'm using the Sieve command within QGIS (Raster > Analysis > Sieve), but when I run the command with any variation of parameters, it completely changes the histogram of my raster data from between ...
1
vote
0answers
45 views

GDAL WMS in QGIS 2.4

I'm trying to add in QGIS a layer shown here : propluvia When I watch in my console I see this request corresponding to the layer I need. The server is not able to respond to a getCapabilities ...
2
votes
0answers
41 views

Error in polygonising raster data with QGIS on Mac

I'm using QGis Chugiak on a Mac and I'm trying to converting a raster layer in a vector data by: Raster/Conversion/Polygonize. So, I select the layer needed from the drop-down menu, I give a name to ...
0
votes
0answers
45 views

Merge/mosaic categorical rasters in QGIS/GDAL

I am attempting to make yearly bins of some monthly MODIS data for all of the US. The cells of the raster are defined with Julian dates indicating the date at which a burn event took place. After ...
1
vote
0answers
49 views

Rasterize shapefile using another raster's size and resultion

Rasterizing a vector (shp) I face the following problem: I want my output file (the rasterized vector) to have the same resolution and dimensions as an existing raster. If I understand the interface ...
0
votes
0answers
42 views

Polygonize only pixel values of 1 from a raster

I have a raster mask that I have created in QGIS (2.2.0) that consist of 0, 1 and nodata values. I would like to end up with a polygon dataset that consist of only the value of one pixels from this ...
0
votes
0answers
37 views

GDAL Installation help in windows

I'm trying to build a GIS application in Django Framework. I completed the GeoDjango installtion (postresql, spatial libraries). I installed OSgeo4W in my C drive. I also setup environment ...
0
votes
1answer
38 views

QGIS processing does not support jpg

I would like to work with the gdal functions provided in the processing toolbox. It is easy to call: import processing processing.alglist() ...
0
votes
0answers
48 views

gdal_translate from within pyqgis [duplicate]

I want to use gdal_translate from within a python script in my plugin qgis2leaf. I've tried with ...
4
votes
3answers
126 views

How to compute the outline of multiple tracks?

I have multiple gps tracks with depth data gathered from the lake. The tracks are overlapping/intersecting. I want to get an outline polygon. I have a multi-line shp. I've tried to diffuse it in qgis ...
0
votes
0answers
34 views

Copy queried attributes of a shapefile to a new shapefile [duplicate]

I have a polyline-shapefile, which I have successfully read into python using pyshp module. My problem is to save the 2nd node of every line feature into a separate, single point file. I have ...
1
vote
1answer
580 views

How to change GDAL version in QGIS to get ECW import to work

I’ve previously been successful in importing ecw into QGIS 2.0 but the same methods (for example How to add *.ecw files to QGIS 2.0 on Windows?) have failed with a fresh install of QGIS 2.2 with ...
4
votes
2answers
77 views

“Levelling” elevation data coinciding with polygon?

I have a shapefile containing building geometries (polygons) and a elevation dataset. The elevation data doesn't perfectly match the buildings. I want to "flatten" the elevation data so that ...
1
vote
1answer
55 views

Trying to use gdal2xyz in QGIS: “Error:Wrong command”

I am using the following command gdal2xyz.dy -csv /Users/me/Downloads/esp_gpwv3_pcount_ascii_25/espp00ag.bil /Users/documents/tttest.csv in the commander, but I get the following error message ...
0
votes
1answer
74 views

Using gdal merge correctly?

Currently trying to use gdal_merge within qgis to stack three raster bands, the command it's showing is like this: gdal_merge.bat -separate -of GTiff -o out.tif "LC80190302014126LGN00_B4.TIF" ...
2
votes
1answer
214 views

QGIS says “osgeo [python-gdal]” isn't installed on Mac

I know similar questions have been asked (like this one) -- but I'm encountering a unique problem. I installed GDAL complete 1.11 from KyngChaos, but when I open QGIS, I get the following error ...
0
votes
1answer
231 views

Missing QGIS raster menu tools - '“osgeo [python-gdal]” module is missing'

I recently had to reinstall QGIS (version 2.2.0-9) and the raster menu is missing its tools. I understand that the GdalTools plugin must be installed and enabled. I have already installed the GDal ...
0
votes
0answers
63 views

Snag loading Gdal 1.11 for Qgis 2.2, on a Mac

Can't load Q2.2 on a Mac without Gdal 1.11. but when I try to load 1.11 'Complete' version, it fails and gives me an error message to contact the developer. Anyone else had this kind of trouble? ...
1
vote
1answer
112 views

Rasterizing polyline data with QGIS/GDAL: custom line width

I need to make a raster from a polyline shapefile. However, when I use gdal_rasterize (either directly or through QGIS), all my lines are drawn one pixel wide, while I need them to be drawn with the ...
1
vote
1answer
64 views

List the projection & datum of all the files in a folder

In QGIS/GRASS, is it possible to list the projection details of all the shp,tab,dxf files in a folder ? We are having 100 - 150 files in too many folders. We would like to create a table of Proj ...
0
votes
2answers
75 views

From RGB raster to grayscale

I have been searching for a way to rasterize shp files (Unexpected output when using gdal_rasterize) and it worked with a little help. Now, my code is first rasterizing the largest sip file and than ...
1
vote
1answer
99 views

syntax error when using gdal in python console QGIS

When I run the following code in the python console in QGIS I get a syntax error: import osgeo.gdal gdal_rasterize [-b 1] [-burn 255] [-a Pixelkost] [-te 170000.2 168000.27 177999.8 177999.8] ...
0
votes
3answers
56 views

Colorizing raster in QGIS 2.2 without using OSGeo4W command line?

Total beginner in QGIS. Following this guide right now: https://www.e-education.psu.edu/geog585/node/695 At step 4 I created the simple txt file which I now need to use to colorize the raster ...
2
votes
0answers
142 views

How to fix “Raster layer: Provider is not valid” error when loading PostGIS rasters?

I compiled and installed the current QGIS master as usual and I imported some raster data into my postgres 9.3 database with postgis 2.0.2 extension. Whenever I try to import the raster data into qgis ...
3
votes
3answers
90 views

QGIS Mosaicing with null values in images

I have a set of landuse landcover data which needs to be mosaiced. Whenever i try using QGIS Raster>miscellenous>merge tool. giving no datavalue as '0', it returns either (A) ' Traceback (most ...
3
votes
2answers
182 views

How to add Georeferenced PDF as layer to QGIS 2.0?

I have some georeferenced pdf's that I would like to open in Qgis. I have read that GDAL version 1.8 and higher will support pdf, and I have GDAL 1.10 installed with Qgis 2.0 on windows 7, But when I ...
0
votes
0answers
58 views

Problems rendering tilestache served mbtiles in QGIS

I came across Geoffery Hing's walk through on using Tilestache to serve up mbtiles to QGIS. I followed the configuration and I was able to view tiles in the browser without any problems. However, when ...
2
votes
2answers
278 views

Conversion of point grid to a raster with open source tools (Gdal, QGIS …)

I'm looking to do something which seem simple to me, but I haven't found a solution since 2 days I looked for. I've got a Postgis DB with lot of points (WGS84) spaced of 100 meters which cover a ...
0
votes
0answers
51 views

How to rasterize a point layer? Cell value should be 1 if feature attribute is 1

I’m a fairly experienced GIS user, but I’m new to QGIS. I’m using version 2.2, and I’m trying to convert a point data layer into a raster data layer using the Rasterize tool. The point data layer has ...
0
votes
1answer
83 views

How can I reproject a layer in pyqgis?

I have a problem. I'm currently trying to get the extent of a vector layer in latitude and longitude coordinates in python. The layer is currently in EPSG:3857, so .fullExtent() is not returning what ...
0
votes
1answer
138 views

Error with Gdal 1.10 install on Ubuntu 13.10

I've installed GDAL 1.9 then upgrade to 1.10 on Ubuntu 13.10 and then now it's error (gdalwarp can work but gdal_translate is fail) gdal_translate ERROR 1: gdal_translate was compiled against GDAL ...
1
vote
1answer
244 views

QGIS DEM (Terrain models) Mode Slope creates wrong data [duplicate]

I have a DEM raster file downloaded from the USGS site. The file can be downloaded here. I am trying to create a slope raster in percent with the DEM tool in QGIS. The GDAL command is the following: ...
2
votes
3answers
124 views

How to apply a specific Rendering to an Image and export to JPEG?

We have a specific process which generate an interpolated single band 32-bit Float Raster in Erdas Imagine (.IMG) format. This process generates an image every hour. We wish to apply a specific ...
1
vote
2answers
150 views

How to create a time series with a NetCDF raster from Ensembles E-OBS using GDAL, R, GRASS GIS or SAGA GIS

I downloaded a NetCDF file that contains daily precipitation values from 1-1-1950 to 30-6-2013. The raster has 23191 bands. http://eca.knmi.nl/download/ensembles/download.php My goal is to analyze ...
2
votes
1answer
71 views

how do i get a GDAL(using gdalwarp) clipped layer projected in pseudo mercator ESPG:3857 to not be shifted?

how do i get a GDAL rasterized layer projected in pseudo mercator ESPG:3857 to not be shifted ? i have a vector layer projected in ESPG:3857,after rasterizing using this command: gdal_rasterize ...
1
vote
0answers
139 views

Workflow with raster in Qgis 2.2

I'm trying to build a workflow with the Qgis 2.2 processing toolbox. I want to clip a raster layer with a vector layer using the GDAL tool "clip with a layer mask". But it doesn't work. The error ...
2
votes
1answer
468 views

Georeferencing an image with GDAL, based on QGIS Georeferencer Plugin

I would like to georeference an image with GDAL. The image already has a spatial reference set (EPSG:31276). For the georeferencing, I have a list of 4 ground control points (also in EPSG:31276). ...
6
votes
1answer
159 views

GDAL equivalent of ArcGIS Mosaic

The word 'mosaic' is often used for quite different things within the worlds of ArcGIS and GDAL. With GDAL and it's downstream applications like Qgis it is common to see mosaic used in the context ...
3
votes
3answers
331 views

Per-pixel (statistical) calculations on a raster stack using GDAL

In R, it's relatively trivial to perform per pixel calculations based on a raster stack (e.g., get std.dev for each pixel on a 12 layer GeoTIFF). Unfortunately, the speed is less than desirable when ...
0
votes
1answer
98 views

gdal's polygonize function (via qgis) is not turning monochrome rasters into readable shapefiles regardless of inversion of color scale

I've tried polygonizing this monochrome bitmap as this: and this: and either way it ends up looking like this when (zoomed in) after gdal's polygonize operation: Is there any way I can tell ...
0
votes
1answer
182 views

How can I correct a .pgw file for a PNG image?

I have a PNG file and I need its .pgw file to be set with NAD 83 as the projection. I have created a .pgw file: 799 0 0 -799 -122.562 37.1946 However when I open the PNG in QGIS or ArcMap 10.2 it ...
0
votes
1answer
69 views

Cannot display Oracle raster images using QGis

I am dealing with QGIS 2.2 and the plug-in Oracle spatial georaster. Apparently the connection to the database can be made, as the raster images are listed once you press 'Connect', but when try to ...
0
votes
1answer
43 views

Missing Georeferencer

I installed Qgis Master 64 bits on win7 64 16gb of ram and I am unable to locate the georeferencer. All other Gdal application are there, Gdal is active, but no georeferencer. I tried yesterday, ...