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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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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11 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 ...
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41 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? Would I be better off converting (with gdal_translate) the ...
2
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2answers
110 views

gdal_grid unable to get nodata outside of original data area

I have a vector based csv file that I want to convert into a grid using gdal_grid, but I want to force null data values strictly around the area where there is data. I can get gdal_grid to work but ...
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1answer
455 views

How to read Geotiff tags and pixel per pixel values using GDAL C#

I'm new here and I'm new at programing with GDAL C#. My question is how I can get the value of SRTM GEOTIFF pixel to compare with it's neighbors, and how can I get the values of Geotiff tags.
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1answer
409 views

GDAL.RasterizeLayer not ported to the C# bindings?

I am trying to use the OSGeo.GDAL.Gdal.RasterizeLayer(…) from GDAL 1.9.2 and it requires some SWIGTYPE parameters: OSGeo.GDAL.Gdal.RasterizeLayer( OSGeo.GDAL.Dataset dataset, int bands, ...
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10 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
14 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 ...
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2answers
284 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 ...
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2answers
405 views

Rotating rasters using GDAL Geotransform (and ArcGIS Desktop)

I am working on a GDAL driver for a proprietary grid-format. In some cases, the grids are rotated in order to get smaller file sizes. In my GDAL geotransform array, I do the following (showing a ...
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1answer
10 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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13 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 ...
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2answers
46 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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1answer
77 views

Which kind of grid format is this?

in a project I got some raster files with the following content (header and data are in one txt file): HOUR 17 MINUTES 30 YEAR 2012 MONTH 5 DAY 4 CITY Emilia;Bologna NROWS 99 NCOLS 156 ULXMAP ...
3
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1answer
37 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 ...
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1answer
65 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) ...
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2answers
65 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 ...
2
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1answer
435 views

Problem in displaying tile images using openlayers3

I have problem with displaying my TMS layer using OL3. This is my first time working with tile images this way so maybe it doesn't have to do anything with ol3, maybe I just don't understand it right. ...
4
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1answer
598 views

Grid registration issue converting from GeoTIFF to Esri ASCII Raster format?

I've got a 3 arc second digital terrain model represented as a 32-bit GeoTIFF that looks like this: $ gdal_info gom03_v1_0.tif Driver: GTiff/GeoTIFF Files: gom03_v1_0.tif Size is 10200, 7800 ...
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2answers
84 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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1answer
166 views

Using GDAL to read dted files

How do I get the elevation at a certain point using gdal to read in a dted file? I don't see much useful information out on the web. I'm sorry I should have been more specific. How would I ...
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1answer
44 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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1answer
160 views

Convert a KML ImageOverlay to World Files with GDAL

I have many raster outputs from an Open Source radio transmission topographic path tool called SPLAT, georeferenced in KML image overlay format. I have figured out an easy way to use tools to ...
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2answers
29 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 ...
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28 views

gdal and python runtime error

Can't seem to figure what might be causing this error. The first file from the input path was processed while the rest of the files has an error. Any idea? @echo off setlocal enabledelayedexpansion ...
4
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2answers
59 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. ...
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17 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 ...
1
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2answers
122 views

gdal_grid has some problem with reading vrt file

I am using gdal_grid module(from gdal 1.10) and it has some problem with reading the vrt file. I checked this link but it does not work. gdal_grid problem reading vrt file The command is ...
3
votes
1answer
245 views

install gdal extention in GeoServer

I am trying to install the GDAL extension (I want to use ecw files in GeoServer). So here is what I did so far: 1) downloaded the GDAL extension and extracted to: C:\Program Files ...
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0answers
21 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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1answer
9 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 ...
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2answers
182 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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0answers
20 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
27 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 ...
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2answers
558 views

GDAL/proj4 equirectangular projection coordinate system units assumed by OGRSpatialReference and GDALDataset::GetGeoTransform()?

How do I configure my OGRSpatialReference object to specify an equirectangular projection system http://en.wikipedia.org/wiki/Equirectangular_projection where the affine geo-transform matrix (provided ...
2
votes
1answer
26 views

Why does GDAL Polygonize flip features vertically?

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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1answer
406 views

Polygonize.py: AttributeError: 'NoneType' object has no attribute 'CreateDataSource'

Given a topographic raster tif of an european country where elevations are simplyfied to either 0, either 200. How to create a polygon ? Comment: With the following polygonize.py command: ...
0
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1answer
107 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 ...
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0answers
16 views

Determine overlap of rasters in different projection systems

I'm trying to improve a python script I have for doing point-by-point comparison between datasets. It uses osgeo. My first input is a netCDF file: I extract the relevant information and store it as a ...
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32 views

Offset problem with GeoTIFF and Google Maps

I have several GeoTIFFs generated with GDAL, and just some of them present a weird offset shift of a range of ~5 km in average. The range of these problematic rasters is as much as -85/-70/-20/0. ...
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0answers
10 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 ...
3
votes
2answers
95 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 ...
2
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2answers
119 views

Invert gdaldem aspect

I am trying to identify lakes and other water bodies in a DEM file. The source file is located here. I am using gdaldem aspect to identify contiguous pixels with zero slope change. gdaldem aspect ...
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1answer
49 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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1answer
23 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 ...
2
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1answer
133 views

Read DGN file in java or c#

I'm looking solution to read DGN file in java or c# without any success. Gdal makes many problem and doesn't support all element eg. complex element. Does anyone know of a library that supports the ...
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18 views

GOES 13 EAST How to Georeferencing

I have a many image for Georeferencing, Goes 13 EAST this is metadata: GOES 13 Imager frame 78 at UTC 14:45:22.485 day 009 of 2015 Vis pixels : 4009, 24840 lines : 2621, 13440 Vis Lon : ...
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17 views

Color scaling for raster images(batch?)

Let's say I have raster images and I want to change their color based on their data value(color scaling). If the data values are from -(all negative value) - 0, I want to have that colored Blue. If ...
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2answers
402 views

I need to extract a specific layer from a Geospatial PDF using GDAL/OGR

I have GDAL/OGR 1.10 installed on a 64bit Windows 7 machine. I have some Geospatial PDFs that I want to crop to the outline of the map and convert to Rasters. However I cannot clip to the neatline. ...
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1answer
226 views

gdal2tiles doesn't use resampling method correct?

I'm using gdal2tiles to create tiles from MODIS satellite imagery (250 m resolution) and I have noticed that I get the same bad result if I use -r near or -r bilinear (or lanczos for that matter). See ...