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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1answer
114 views

Polygonize a raster using GDAL JAVA bindings - passing raster pixel value to the resulting feature

I have a raster GeoTIFF file with values from 0 to let's say 5. When I run gdal.polygonize (I'm working with JAVA and GDAL bindings to JAVA) on it, I get features with corresponding polygons. The ...
2
votes
2answers
207 views

How to calculate monthly maximum values from daily data in a 365 band grd?

I have a MINT2005.grd file which has 365 bands representing days of year from 2005. Each band is a 32x35 matrix representing the temperature at different latitude and longitude pair. How do I ...
4
votes
1answer
721 views

How to find the distance to the nearest coastline from a land-based latitude/longitude point?

I'm completely new to GIS and unsure what I need to solve this problem: In the image above turquoise is actually land. Sea is white. I tried using the NASA Distance to the Nearest Coast data dump ...
0
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1answer
320 views

How to dissolve naturalearth vectordata with gdal?

trying to use the workflow described by @aflaciano at How to render area that crosses 180°? I did the following: 1) downloaded and installed gdal-111-1600-x64-core.msi from ...
3
votes
1answer
755 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 ...
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1answer
1k 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 ...
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0answers
196 views

How to import SRTM data for the whole planet into TileMill

I need to get SRTM elevation data for the whole planet into TileMill. I already walked through the instructions on Steve Bennett's blog and it worked fine for small areas. The problem is now that for ...
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1answer
171 views

Error 193 while running gdal_calc.py using subprocess.call in Python

The following code works when used with cmd prompt: C:\gdal_calc.py -A C:\a.tif --outfile=C:\result.tif --calc="A+1" When I want to run the same code with subprocess: import subprocess ...
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1answer
768 views

OSGeo4W error - The procedure entry point … NCSEcw.dll

There are a few posts with a simular error but none with this particular dll. When I try to run a gdal executable from the command line or try to open the OSGeo4W shell I get the following error... ...
0
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1answer
126 views

Developing QGIS plugin on Mac - GDAL

I'm developing a plugin for QGIS called DEMtools. It runs fine on my linux machine, but is causing me headaches when run on Mac OS X Mavericks (surprise, surprise). I keep getting segmentation faults ...
0
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1answer
195 views

Segmentation fault when using GDALReprojectImage [closed]

I am trying to warp a dataset read with the DTED driver by using GDALReprojectImage. The output dataset is created with the MEM driver. The program is failing with a segmentation fault. Below is a ...
3
votes
1answer
265 views

Reading zipped ESRI BIL files with Python

I asked the question below on StackOverflow, but haven't received any feedback there yet: I have precipitation data from the PRISM Climate Group which are now offered in .bil format (ESRI BIL, I ...
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1answer
238 views

Trying to use gdal_translate on WMS

I am trying to export a raster image from a WMS using gdal_translate and have not had any success. I have read http://www.gdal.org/frmt_wms.html but still no success. In my XML file, what should the ...
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0answers
179 views

gdal commands cannot import gdal — possibly ArcGis conflict with separate Python?

I installed ArcGIS 10.1 yesterday (Windows 7 64-bit), but have a separate Python 2.7 installation. Now my gdal does not work correctly anymore. It looks like all commands without the ending "*.py" ...
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vote
1answer
821 views

Most efficient way to tile/pyramid 4 million images using gdal for geoserver WMS

My scenario consist of 4 million geolocated images each measuring 1536x1536 pixels in size. What is the most efficient way to pyramid these images? My end goal is to serve these images using ...
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0answers
74 views

How to prevent transparent borders (collars) of a tif wipe out overlapping regions of adjecent tif while using gdalbuildvrt

I have a set of Geotifs that have got transparent borders (collars) of irregular shapes & dimensions around them. First I created a VRT over this set of Geotifs through gdalbuildvrt. Then I ...
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vote
2answers
299 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 ...
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1answer
46 views

gdalcontour output not aligned with the DEM

I use gdalcontour to generate the contour lines of a DEM in shapefile format. However the shapefile is not aligned with the DEM. Someone have a solution for this? GDAL version is 1.10 im using thins ...
2
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0answers
153 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. ...
1
vote
1answer
77 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 ...
1
vote
1answer
78 views

Can I dewarp an image using GDAL?

I have a GeoTiff image mymap.tif https://www.dropbox.com/s/51chrzv9vp9olg8/mymap.tif $ gdalinfo mymap.tif Driver: GTiff/GeoTIFF Files: mymap.tif Size is 1085, 281 Coordinate System is: GEOGCS["WGS ...
2
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0answers
81 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
1answer
56 views

Cannot Find GPTS Object - GDAL C#

UPDATED To clarify my previous post. I have written a small application to convert maps saved as PDF's to PNG files then tile the maps to be used in a webservice. After experimenting with the PNG ...
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2answers
259 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 ...
2
votes
2answers
127 views

How do I transform a raster image to one with rounded corners (cylindrical to pseudocylindrical)?

I've been working with the altimetry data from topex.ucsd.edu/WWW_html/mar_grav.html Was having difficulties extracting the data, so I wrote a simple tool to do that. Creates a bitmap form the data ...
1
vote
1answer
280 views

Unexpected output when using gdal_rasterize

Ok, I used the following code for converting my layer into raster format but I get a tif file that is completely black or white... from osgeo import gdal, ogr # Define pixel_size and NoData value ...
3
votes
2answers
427 views

Problem when converting sosi to shapefile with ogr2ogr on Linux

I am trying to convert a SOSI file (Norwegian geodata format) to a shapefile. I have set up gdal, but apparantly there is a lot of things that I dont have support for. When I do a ./configure, this is ...
1
vote
1answer
258 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] ...
1
vote
3answers
69 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 ...
7
votes
3answers
420 views

Color balance and publish large amount of high resolution imagery in geoserver

I have a large amount of RapidEye images (+300 Gb) that I want to use as a basemap for a online application. So far I've managed to serve them as an ImagePyramid in geoserver following the steps shown ...
3
votes
0answers
262 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 ...
0
votes
1answer
239 views

POSTGIS raster/Java with GDAL bindings - Load byte array in Gdal Dataset Object

I would like to load a raster as java.awt.image.BufferedImage (or equivalent class that would allow to perform some display) out of my PostGIS database. My Raster is inDb (loaded with raster2pgsql) ...
0
votes
1answer
94 views

How to resolve a 'Received NULL pointer' ArgumentOutOfRangeException for OSGeo.OGR.Geometry.TransformTo?

I am attempting to project a geometry using the GDAL c# bindings and I'm getting a ArgumentOutOfRangeException ('Received NULL pointer') exception on the Transform methods of Geometry. I'm also ...
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0answers
159 views

MODIS products reprojection problem

I am working with Modis Data (MOD02, MOD11, MOD03, MOD35). In particular I am looking for a solution to reproject the subdatasets below, into albers equal. Because I am using NLCD dataset which uses ...
3
votes
1answer
273 views

How to preserve original resolution of scanned 1-bit PDF raster with gdal_translate?

I am using gdal_translate to convert non-spatial PDFs to non-spatial TIFFs (intended for subsequent manual georeferencing). This is my gdal_translate command: gdal_translate -of GTiff -sds -co ...
0
votes
1answer
146 views

gdalwarp increase resolution

I currently have a 87Mb Compressed GeoTiff with a resolution of 50m. I need to interpolate this to 2.5m I have used gdalwarp to achieve this using a cubicspline, but it took 12hrs and resulted in a ...
1
vote
2answers
280 views

Unsuccessfully trying to iteratively run gdal_polygonize in a batch file [closed]

Thanks in advance for your help with this. I've been reading, experimenting, and banging my head against the wall for a couple days on this, and could really use some assistance. This is my first ...
1
vote
1answer
425 views

GDAL - How to get geometry type of a MapInfo TAB file?

I am using the OGR MapInfo File driver to read a MapInfo TAB file. However, the function GetGeomType() returns 0 which means 'wkbUnknown` even if the features in the TAB are only multi-polygons. Is ...
0
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0answers
101 views

need help creating layer with geom type wkbGeometryCollection with gdal python

I am having trouble creating a layer with geom type as geometry collection. Thus I am unable to output to a shapefile. I have attached code below. dstLayer is null. This does not happen if geom type ...
5
votes
2answers
930 views

Error exporting data from Oracle to shp using ogr2ogr

I have an oracle table which I would like to query/make a selection. I would then like to export the selection to a shp file. I'm using gdal and ogr2ogr. Following the guidelines here and here I ...
0
votes
1answer
193 views

gdalbuildvrt error when mosaicking SRTM data with different NoData values

I'm attempting to mosaic together 9 SRTM tiles downloaded from CGIAR to produce a DEM of Borneo. I'm using: gdalbuildvrt Borneo.vrt BorneoSRTM/*.tif where BorneoSRTM contains the 9 tif files to be ...
0
votes
0answers
72 views

Import GRD and count days with temperature below zero, using python

Minimum temperature of a year is given in GRD file. I have to read that file and then calculate the frost day (less than zero degrees celcius) from it in python.
3
votes
3answers
287 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 ...
4
votes
2answers
908 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 ...
2
votes
2answers
405 views

create polygon adjacency matrix using python

I am trying to create an adjacency matrix from a set of polygons. That is, I have a bunch of polygons and I want to identify which polygons have a common edge or "touch" each other. Once I find this ...
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0answers
166 views

Problem with polygon overlay in raster stats using gdal

I am using the raster_stats module in python to calculate the mean carbon value for different sets of polygons. Here is the code that I am using: africa_sat = ...
0
votes
0answers
144 views

Convert Shp to KML error org2org Error4

I am attempting to convert Shp file to Kml using command line org2org application. I have used this in the past to convert more simple shp files and was sucessful. However I get an error message when ...
3
votes
1answer
415 views

Are the functions in OGRPolygon accessible through the python bindings?

I'm currently trying to use the OGR python bindings to process some shapefiles. I want to obtain the number of interior rings in a polygon feature. Unfortunately I'm unable to use the documented ...
1
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0answers
136 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 ...
3
votes
2answers
2k views

using Python to calculate NDVI, output as a Geotiff

I need a script that can calculate NDVI from two separate input Geotiff files, then output the results as a Geotiff. I wrote following script, most of which is borrowed from various on-line sources ...