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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58 views

Why azimuth result is wrong for this pyqgis code?

In this code I want to obtain azimuth from a single point to each pixel center, but when run it, in raster created azimuth result for each pixel is wrong, what is correct code? from osgeo import ...
2
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58 views

Why this pyqgis code cause crash dump in QGIS?

In ArcGIS there is gp.EucDirection to calculate Euclidean allocation, distance, and direction around a point, Is there equivalent function in pyqgis or gdal? I wrote a script with help of gene and ...
2
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0answers
25 views

No Exception Handling in GDAL/OGR java bindings: ogr.UseExceptions() has no effect

When a GDAL/OGR 2.0.1 swig/java operation encounters an error, the message is written to stderr but no exception is thrown within the application -allowing it to continue, which is highly ...
2
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0answers
96 views

display of raster in QGIS - cells are not rotated

when viewing rotated rasters in QGIS - the overall raster is rotated (as designed), though each grid cell is not. (the nodata value doesn't appear to pick up as the default in QGIS either - ...
2
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0answers
138 views

NetCDF to Shapefile with Python and GDAL?

I need to save my outputs, which are netcdf files or panda python tables, to shapefiles. They cannot be rasters because the software I am loading them into accepts shapefiles only. I have googled ...
2
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0answers
57 views

ogr2ogr ST_Difference operation on OGRVRTDataSource

I'm trying to subtract from one shapefile the portions of another which overlap using the following: land.shp: subunits.shp lakes.shp COOKIE=subunits CUTTER=lakes; \ echo ...
2
votes
0answers
42 views

Display or export gdal_translate exponential scaling equation

I have an GeoTiff raster that contains elevation information at each pixel. As OpenLayers 2 can't display GeoTiff, I convert it to a PNG image and have to apply an exponential scale so the resulting ...
2
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0answers
220 views

Comparing the use of GDAL to build raster pyramids or overviews versus Arcmap 10.1

I have a large set of imagery that I created a mosaic from in arcmap 10.1. I want to use GDAL to create the overviews because arcmap has issues building the pyramids and never seems to complete. I ...
2
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0answers
98 views

Output formats not showing in heatmap plugin (QGis 2.10.1 in ubuntu 14.04)

I just upgraded to QGIS 2.10 (using the debian repos) and the heatmap plugin doesn't show any formats in the dropdown menu. I'm able to open every raster format I have at hand and, of course, the ...
2
votes
0answers
66 views

Multiple layer intersection

I am trying to find a way with qgis/python to get the intersection area of more than 2 layers. All the tools in Qgis take just the 2 input layers. ='( For example in the image below, I have 4 ...
2
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52 views

Is GDAL/OGR (specifically CoordinateTransformation) thread-safe?

I'm using the Java bindings if it matters. I have a heavily multi-threaded program and this is one of the bottlenecks that I have in a synchronization block. If I could remove the synchronization, it ...
2
votes
0answers
238 views

Loading Raster with SharpMap (GDAL) doesnt work

i have problems loading rasterfiles (.tiff) with SharpMap I tried initializing a SharpMap GDAL Layer but nothing happens. It doesnt even throw and error when debugging after i set a path for the file ...
2
votes
0answers
107 views

BlueMarble is appearing strange

I am fairly new to WorldWind and want to make WorldWind Server 1.5 server blue Marble Imagery to worldwind 2.0. I am using WMSLayerManager applet to test my server. Blue marble appears strange on ...
2
votes
0answers
219 views

Zonal computations: computing raster pixel counts within polygons using GDAL versus rasterstats

I'm computing some zonal statistics, and was comparing the results obtained using the GDAL cookbook example code here with the rasterstats zonal_stats function. I want to compute the mean value per ...
2
votes
0answers
111 views

GDAL equivalent to ArcGIS Union?

I have a single shapefile full of overlapping polygons. The ArcGIS Union tool will generate individual, non-overlapping polygons with that geometry. Is there a way to do this with GDAL/OGR or another ...
2
votes
0answers
137 views

Enable LWGEOM for OGR tools (QGIS 2.8)

I am doing some scripted operations on a Spatialite DB using OGRINFO, OGR2OGR etc. in the QGIS 2.8 OSGEO4W shell. Unfortunately, LWGEOM functions such as ST_Split() are unavailable and ...
2
votes
0answers
86 views

Reverse parameters of a projection map

I'm user of a soaring simulator named "Condor Soaring". This simulator is at the center of a community of enthusiastic people who build sceneries (landscapes) which represents quite accurately real ...
2
votes
0answers
94 views

How to re-grid a raster using area-overlap weighted averaging?

I have two rasters r and r2 with different resolutions. I want to re-sample (re-grid) r2 to be the same as r using area-overlap weighted averaging:If an r grid cell is covered by more than 1 ...
2
votes
0answers
48 views

GDAL merge; Why add 0.1?

In the implementation of gdal_merge: https://svn.osgeo.org/gdal/trunk/gdal/swig/python/scripts/gdal_merge.py a value of 0.1 is added to the conversion from geo-referenced coordinates to pixel ...
2
votes
0answers
1k 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)". ...
2
votes
0answers
166 views

Using OGR2OGR with LIBKML (Examples please)

I am trying to figure out how to use GDAL (ogr2ogr) to export spatial data from SQLServer to KML. The standard KML driver works, but it is not very robust. LIBKML has so much promise (layers, styling, ...
2
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0answers
68 views

How to change values in a raster file at particular positions?

I have a collection of coordinates which comes from a QGSGeometry object. The shape is a polygon. example: qgsGeometry [[(75.2172,17.6566), (75.8499,17.9613), (75.5218,17.2113), (75.2172,17.4574), ...
2
votes
0answers
84 views

Help with Python/GDAL documentation

The instructions from the url http://gdal.org/gdal_tutorial.html give the following example: dataset = gdal.Open( filename, GA_ReadOnly) with the following description: It's interpretation is ...
2
votes
0answers
127 views

QGIS polygonize GDAL DLL load failed

I'm using QGIS 2.6.1 and i've been having problems using the polygonize function. I keep getting a "DLL load failed" import error. I've searched older threads which unfortunately weren't able to ...
2
votes
0answers
140 views

ogr2ogr fileGDB translating points

I am converting data from spatialite to fileGDB (and reverse) for a project using QGIS and ArcGIS. When I convert using ogr2ogr (or QGIS) from spatialite to fileGDB, the points are translated ...
2
votes
0answers
103 views

QGIS Problem with extract and warp modules in model builder

I have problems using the gdal modules extract and warp in the model builder. They run correctly when started without the modelbuilder, but when I integrate them in the modelbuilder they won't work. ...
2
votes
0answers
62 views

What is the issue with geopdf format?

I'd like to add the geopdf format as output of a library that I am working on. After have looking around, I have not been able to find a (c, c++, python) library that meet my license requirements ...
2
votes
0answers
91 views

How to Use GetGeomtype Gdal Python

I am just wondering what I am doing wrong when trying to use the GetGeomType. I need to focus on separating layers from a pix file. Two categories are the bitmaps(which are vectors) and then the ...
2
votes
0answers
132 views

Any solution to mosaic Modis MOD13Q1 using batch file?

I have a Modis MOD13Q1 product for Pakistan, four tiles cover my complete area and I have data consisting of 14 years, after every 16-day interval. I want to mosaic them using a batch file which ...
2
votes
0answers
192 views

Improve gdaldem hillshade output (lighten up flat parts)

I have a hill-shading that I made using gdaldem hillshade which is already pretty good. I used the option -alt 60 to get nice contrast, but the problem is, that with lowering the light-source, also ...
2
votes
0answers
55 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 ...
2
votes
0answers
227 views

Memory leak with GDALOpen?

I'm very new in using GDAL, and trying the tutorial given here. But with a piece of code with only GDALRegister_GTiff(); GDALDataset *poDataset = (GDALDataset *) GDALOpen(argv[1], GA_ReadOnly ); ...
2
votes
0answers
1k views

Correct way to extract pixel data using GDAL. Current method gives repeated but changing value.

I am trying to open a spectral file and move bands of data from GDAL to OpenCV's Mat data structures. As of now I am just trying to make sure that I can correctly access each band using GDAL and pull ...
2
votes
0answers
249 views

MySQL+GDal+MapServer+OpenLayers WebMercator problem

I have a problem/question what is the most efficiant way to go from WGS84 (epsg:4326) to webmercator. Outline of the structure right now: MySQL Database: with point Latitude/Lontiude Data [~200 ...
2
votes
0answers
430 views

Why does python reads only the no data value from GeoTiff file?

I had a number of tiff files with a country's map. They had different rows, columns or different projections etc. I needed to make them with same projection, spatial resolution and same number of rows ...
2
votes
0answers
336 views

How can you calculate the union/merge two polygons in ogr2ogr?

I want to calculate the union/merge two overlapping polygons using ogr2ogr (as I have 300+ to do). I want the output to be the same as you would get if you used the 'Merge shapefiles to one' command ...
2
votes
0answers
111 views

How to preserve GCP's after gdalwarp

I'm trying to figure out how I can preserve my GCP's after a gdalwarp. I need the georeferenced GCP's data, so I can calculate the Root Mean Squared Error. Is there a way to preserve this data, and ...
2
votes
0answers
244 views

Convert a classification image to aggregated polygon in shapefile using gdal/python

My goal is convert a 2D numpy array to shapefile. The matrix results from a classification, so the numbers have a meaning. I solved my problem, but the solution is somehow involuted and complicated. ...
2
votes
0answers
90 views

Append ArcGIS feature layer data using GDAL/OGR API

ArcGIS servers are configured with a maximum records count that they're allowed to return following a REST query. This maximum is usually 1000 records, which means that GDAL/OGR clients should ...
2
votes
0answers
429 views

Decompress a LZW-compressed GeoTIFF

I have a LZW-compressed GeoTIFF file and would like to split it into several smaller regional files and change the format to png. I tried to do the spliting with gdal_translate -srcwin. I only get a ...
2
votes
0answers
55 views

GeospatialPDF javascript access

Using javascript in GeospatialPDF, is it possible to zoom in to an extent, say when the document is opened the first time ? To what extent can I use javascript to access the geospatial data? pan, ...
2
votes
0answers
192 views

Extra row and column in a raster after GDAL grid import

I'm exporting an ESRI grid to TIFF format and after that I'm reading this exported raster file into SAGA GIS. However when Saga reads this file in there appears to be an additional row and column in ...
2
votes
0answers
429 views

Zonal Statistics using Gdal and Python

I recently came across a loop_zonal_stats function by @ustroetz found here: Issue Trying to create Zonal Statistics using Gdal and Python.. I am using a (single) polygon shapefile and a raster file to ...
2
votes
0answers
131 views

Write raster with its attribute table and symbology

I am classifying lots of rasters and I'd like to automate the legend creation and symbology displaying for easy manipulation. Here is the kind of raster I'm dealing with: library(raster) r <- ...
2
votes
0answers
312 views

GeoDjango with MongoDB

Has anyone had experience successfully deploying GeoDjango with MongoDB? Is it possible? If so, how is it as simple as as installing the non-relational fork of Django and setting MongoDB as the ...
2
votes
0answers
111 views

C# GDAL DEM Speed

My 64-bit, Win 7 C# application using GDAL creates a number of constant-bearing paths with 1000+ points along each path. At each point, I want to look up the 4 closest elevations for interpolation. ...
2
votes
0answers
393 views

How to add new raster store and publish for ECW fromat in GeoServer 2.4-RC2?

I am using GeoServer 2.4 RC2 and Tomcat7 on windows xp OS. I have extracted the gdal-data.zip (2.4.0) and geoserver-2.4-SNAPSHOT-gdal-plugin into Tomcat 7.0\webapps\geoserver\WEB-INF\lib. Now ...
2
votes
0answers
137 views

How to join attributes by location with command line

I would like to joint the attributes of 2 shapefiles by location but with a command line (linux). This feature is easy in QGIS but it is VERY slow. Is there a way of doing this with ogr or pyqgis ? ...
2
votes
0answers
148 views

Displaying DEM raster in QGIS

Using Raster>Analysis>DEM to display hillshade produces the message "gdaldem.exe had stopped working" so I asked the community. I'm new to QGIS, and I now realise after a little experimentation that I ...
2
votes
0answers
2k views

How do I change from lat/long to a metric coordinate system in GRASS?

Yes, it's yet another transformation question. I am working with ASTER DEM data, which is LatLong WGS84. I want to process the DEM map into an STL file for use in a CFD simulation. The script I am ...