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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159 views

Usage of gdal.Polygonize(,,,)

I am trying to code gdal_polygonize source.png -f "GeoJSON" destination.geojson with the java-bindings of gdal. I don't know how to make gdal.Polygonize(...) create the "DN"-Fields one obtains when ...
3
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1answer
233 views

gdal_grid - fails to find layer and field

I'm using gdal_grid for the first time and get this issue: gdal_grid -zfield field_3 -l layer0 OLEX-LAT-190952014.vrt OLEX-LAT-190952014.tiff ERROR 1: Failed to find layer 'layer0' on datasource ...
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1k views

SSL certificate problem: unable to get local issuer certificate with gdal and curl

* Connected to ascendxyzdatastagingweu.blob.core.windows.net (168.61.57.78) port 443 (#0) * libcurl is now using a weak random seed! * SSL certificate problem: unable to get local issuer certificate * ...
2
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1answer
51 views

Can JPEGs have overviews?

I was a little surprised to see the output of a .jpg file when gdalinfo said it had overviews. Can jpegs really have overviews or what does this mean? Can they be removed to reduce file size? Image ...
5
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1answer
357 views

Reprojecting LiDAR data with libLAS

I have a lidar file (file.las) with the following spatial reference: Spatial Reference: PROJCS["NAD83 / UTM zone 11N", GEOGCS["NAD83", DATUM["North_American_Datum_1983", ...
4
votes
1answer
226 views

smallest, lossless, GDAL ready image format

I would like to know what the smallest file format is I can use with GDAL that fulfills the following criteria: lossless compression (relatively) easy to read/write with GDAL Python bindings least ...
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0answers
241 views

Issues installing GDAL with PostgreSQL

I'm trying to install gdal-1.11.0 on CentOS 6 machine. Following the instructions, this is my config ./configure --prefix /usr/local --with-fgdb=/usr/local/FileGDB_API ...
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2answers
908 views

GDAL C++ API: How to create PNG or JPEG from scratch

I'm new to GIS and GDAL. My question probably is very basic, but I couldn't find answer. May be I don't understand GDAL ideology. I need to create raster images from scratch, for example, JPEG or ...
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1answer
508 views

Using gdal-java of OSGeo4W

I would like to use gdal_polygonize and gdalinfo in java. This site says: "Note that OSGeo4W includes a gdal-java package and a Java runtime making it fairly easily to build local Java applications ...
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1answer
331 views

downsample raster map with average algorithm

I need to downsample map to new map with less resolution NOT for overview BUT to new map file with smaller size I need to do that with gdal Utils thanks!
2
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1answer
240 views

GeoserverTerrainProvider plugin displays faults in elevation tiles

I try to display elevation data using the triple Geoserver/Openlayer3/Cesium. It seems I have the same problem than http://stackoverflow.com/questions/25936968 and for now, I can not get a working ...
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1answer
139 views

Adding Origin to Geotiff using Python GDAL?

Alright, so I'm getting closer to figuring this out but I'm stuck at one (that I know of) thing... how do I use GDAL to apply a known origin of a GeoTiff to another that has been processed in ...
2
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1answer
298 views

changing negative pixel spacing to positive

I have a bug with one application that does not handle negative pixel spacing values. Therefore I would like to change the negative pixel values of my images (geotif) into positive values (while ...
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0answers
191 views

Gdal in ipython

i am trying to run GDAL in Ipython Notebook but i don't get it. I did conda install GDAL and it was aparently ok, but when i try to do the import i get this: ImportError ...
0
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1answer
190 views

unresolved external symbol in MSVC 2010

When I try to build a project with GDAL, I cannot get rid of the below errors. *Error 1 error LNK2019: unresolved external symbol _VSIFree referenced in function "public: void __thiscall ...
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2answers
196 views

How to read DGN using GDAL in VB.Net?

Reading a DGN file is a big problem for me. I tried more and more but can't find a way to read a dgn(v8) file by VB.Net. After many search, i found out that GDAL can read and write dgn file, but i 'm ...
1
vote
1answer
296 views

Open and split a 4 channel RGB picture

How can I split an 4 channel rgb pic in qgis? With the value tool I can see 4 channel. I tried to use the RGB to PCT tool but I always get an error (File "C:\PROGRA~1\QGISBR~1\bin\pct2rgb.py", line ...
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1answer
1k views

help with TMS (gdal2tiles) Openlayers 3 and custom projection

I work with a local italian projection (EPSG:3003 Monte Mario Italy zone 1) and I had loaded this projection in my project for evitate to reproject all of my data. I had created the tile pyramid with ...
3
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2answers
1k views

GDAL rotate DEM

Is it possible using any of the command line GDL tools such as gdalwarp, etc to perform a rotation of DEM data - a GeoTiff for example? Anyone know how to do this? UPDATE1 After clearing out ...
3
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1answer
176 views

specifying extent in GDAL's WriteArray

Is it possible to specify the extent when creating an empty raster in GDAL? I looked everywhere, but can't seem to find anything. The portion of my script where I write the raster would look something ...
1
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1answer
164 views

Different origin between GDAL/Python and ArcMap of a Modis image

I have a Modis image and i load this image in Python using gdal library from osgeo import gdal, ogr INPUT_raster_1 = "C:\\myimage_1km.tif" ds_1 = gdal.Open(INPUT_raster_1, gdal.GA_ReadOnly) ...
2
votes
1answer
463 views

Load the raster image which is in TIF format using QGIS API

I am quite new inthe field of GIS. I am interested in is to load the raster image which is in TIF format using QGIS API I have followed the steps given the in the follwing link to load shape file ...
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vote
2answers
237 views

How do I convert a GeoTiff's neatline metadata from vector format to pixels using GDAL?

I have a GeoTIFF that produces the following when run through gdalinfo: Driver: GTiff/GeoTIFF Files: PAA_1.tif Size is 14400, 6600 Coordinate System is: ...
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0answers
25 views

gdal_polygonize floating values [duplicate]

gdal_polygonize converts whatever rasters values into vector integers as it is based on the GDALPolygonize() function (http://gdal.org/gdal__alg_8h.html#a3f522a9035d3512b5d414fb4752671b1). It is ...
2
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0answers
168 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, ...
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291 views

How to Read GDB from c#

I am trying to read .gdb file using osgeo api i go for following code but cant read. suggest me. string File= @"D:\GDB File\Demo.gdb"; public IConnection OpenFDOSourceConnection(string File) ...
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2answers
432 views

System call gdal function in R on Mac

Hopefully someone can help me figure this issue out. I am trying to system call gdal functions inside of R using the system / system2 functions. Here is an example of the code: > system("gdalinfo ...
2
votes
2answers
236 views

GDAL reads NEX Climate projection datasets as netCDF on Mac, HDF5 on Ubuntu

I'm trying to work with the climate projection data that NASA released, and is hosted publicly on S3: http://aws.amazon.com/nasa/nex/. The data is available at s3://nasanex/NEX-DCP30. The code I'm ...
1
vote
1answer
137 views

Why does GDAL Polygonize flip features vertically? [closed]

I am trying to convert a 1 band jpg raster into polygons. It is converting the data and I get a polygon shape file. However, the output data is vertically flipped. Input data have no reference ...
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0answers
58 views

How to set -srcwin with python gdalbinding and driver.createcopy

I am using gdal_translate currently to cut a 60000x60000 geotiff into smaller 1000x1000 geotiff files. This works but it takes about 24 hours(and I have 44 of those big images to compute). Im not ...
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1answer
48 views

gdaladdo adding stripes to data

I created some image overviews for a large (1.2 Gb) topo relief image. gdaladdo -r cubic -ro --config COMPRESS_OVERVIEW JPEG --config PHOTOMETRIC_OVERVIEW YCBCR --config BIGTIFF_OVERVIEW YES ...
0
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1answer
186 views

Help interpret GeoTif pixel value python gdal: connection between pixel value, RGB values and physical concentration?

I was running python script that queries a GeoTiff file at the coordinates of a centroid of blocks and as a result I got a list of pixel values, which I have trouble interpreting. When I run gdalinfo ...
3
votes
1answer
4k views

Install GDAL on CentOS 7

I'm having issues with installing GDAL on a fresh install of Centos7 using the ELGIS repo. Here's my commands and output: sudo rpm -Uvh http://elgis.argeo.org/repos/6/elgis-release-6-6_0.noarch.rpm ...
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2answers
1k views

Changing color of raster images based on their data values - gdal

Let's say I have 1 band raster images with Gray Color Interpretation and I want to change their color based on their data values. Data values -1, will be Blue, -0.5 will be Light Blue, 0 will be ...
6
votes
2answers
783 views

Downloading raster data into python from postgis using psycopg2

I have raster data in a postgres table that I want to get into python as a numpy array. I am using psycopg2 to connect to the db. I am able to download the data but it comes back as a string (probably ...
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0answers
36 views

GDAL Warp cuttline not working

Has anyone ever got the cutline to work in C++? I have it working off the command line no problem, but it doesn't seem to do anything when I populate that argument in C++ as below: *//Create a ...
4
votes
1answer
278 views

How do I get GDAL_translate to output better resolution

I have a set of GeoPDFs that I converted to GeoTiffs. However, the end results are horrible. They are very pixelated. The command I passed was gdal_translate -of GTiff inFile outFile -co ...
0
votes
1answer
47 views

Code of _gdal.pyd

I want a deeper understanding of how gdal_polygonize.py works. It uses gdal.Polygonize and gdal.Polygonize refers to _gdal.pyd. Where can I see the actual algorithm where the actual polygonization ...
5
votes
2answers
4k views

Obtain coordinates and corresponding pixel values from GeoTiff using python gdal and save them as numpy array

How to obtain projected coordinates as well as the actual pixel values at those coordinates from GeoTiff file and then save them into a numpy array? I have arsenci020l.tif file, and its coordinates ...
0
votes
1answer
203 views

How do I create a projection file using GDAL

I am trying to obtain a buffer from a polyline file using GDAL with the following function def createBuffer(inputfn, outputBufferfn, bufferDist): inputds = ogr.Open(inputfn) inputlyr = ...
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), ...
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0answers
130 views

QGIS Mac OSX version cannot batch write output files after rasterization

Happy new year everyone, I have been trying to batch rasterize a series of .shp files using QGIS for Mac OS X, and keep coming up against a strange problem. I am using the QGIS 2.6.1 user interface, ...
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vote
3answers
799 views

How to subtract rasters using the gdal_calculate command

I just want to know how to subtract two raster using gdal_calculate command? Or what is the proper way of subtracting using this? Any idea would be greatly appreciated. Note: gdal_calc is different ...
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0answers
136 views

CentOS 6.5 - After compiling gdal.so: Unable to load dynamic library

CentOS release 6.5 (Final) Linux version 2.6.18-028stab101.1 (root@rhel5-build-x64) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46) I'm trying to Install Cartaro CMS (http://cartaro.org/). GeoServer, ...
7
votes
1answer
435 views

How to access file geodatabase (.gdb) rasters with GDAL?

I'm working on a tool that converts raster layers to arrays for processing with NumPy, and ideally I would like to be able to work with rasters that come packaged in a .gdb without exporting them all ...
0
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1answer
18 views

Rastercalc.py and Rastercalcengine.py

Is there any examples on how to use the rastercalc.py or rastercalcengine.py? And what are the purpose of these python module? Are these modules the same with gdal utilities which can be run in ...
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0answers
43 views

Error in warping the merged hdf4 files

I've tried to merge a set of hdf4 files(unknown projection) and it run well. But when I tried to warp the output of the merge hdf4 files an error like this appears: ERROR 1: Unable to compute a ...
3
votes
0answers
99 views

GDALRasterizeGeometries doesn't burn correct Values

What I have is a vector shape file with a string field. What I've done is written a CSV file with the field ID, field_value and now I would like to rasterize the vector layer as a byte raster with the ...
6
votes
2answers
918 views

How to convert float raster to vector with python GDAL

I have float raster and now I want to convert it to vector. How is it possible with python gdal library? I have tried with gdal_polygonize.py of gdal utilities in command line and it worked excellent. ...
3
votes
1answer
208 views

Creating Spatialite DB from Swedish OSM

Good afternoon, I have just started to use GDAL/OGR and I am trying to create a spatialite DB from OSM data. I am using a cut of the Swedish OSM data downloaded from Geofabrik in .osm format. I have ...