GDAL is an open source translator library & utilities for raster geospatial 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 useful commandline utilities for data translation and processing.
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12 views
Python - GDAL: spatial filter
Is there a way with GDAL (Python) to set a spatial filter (bounding-box) on a raster before I process it? I want to read it as an array.
BandReadAsArray(band, xoff=0, yoff=0, win_xsize=None, ...
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9 views
GDAL Plugin with a different version of GDAL aready built into QGIS
My qgis windows version is 1.8.0 Lisboa and use the gdaltools in version1.9.2.
I want to use the plugin NetCDFBrowser, but this plugin need the gdal 1.10.
I install 1.10 stand-alone gdal find here ...
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14 views
Getting started with gdal/ogr
I found some batch code using ogr2ogr in order to convert and reproject vector layers. The difficulty for me is to know what to install and which gdal commandline should I use, and how to configure ...
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1answer
22 views
Using the C++ GDAL API how do I set the GDAL_DATA path?
If I want to change the directory of the GDAL_DATA path or point to a different version of a csv file for EPSG numbers how do I do that using the C++ API?
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1answer
32 views
How to calculate Image boundary / footprint of satellite images using open source tools?
I'm referring to this question&discussion: How do I create a shapefile showing footprints of Rasters?
I need to create the polygon outlines of several single layer raster images, not the ...
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1answer
61 views
Python - OGR: Transform coordinates from meter to decimal degrees
I have a point in a shapefile. The shapefile is in a WGS_1984_Web_Mercator Projected Coordinate System. I want to get the coordinates of that point in decimal degrees with GDAL/OGR in Python.
I am ...
-4
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1answer
49 views
Problem installing GDAL and fiona module in arcmap10?
I am getting message like this
Traceback (most recent call last):
File "", line 1, in
File "C:\Python26\ArcGIS10.0\lib\site-packages\gdal.py", line 2, in
from osgeo.gdal import ...
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8 views
Is there a way to tell the supported input formats of libmap.dll without the associated .exe?
I have only compiled Mapscript_csharp and supporting dlls used in a .NET application - not the executables. Is there a way to tell what input / output formats are supported by these dlls?
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46 views
Reprojection problem with gdalwarp
I have a GeoTiff file with WGS84 datum projection and I'm trying to reproject it using gdalwarp. Using this command
gdalwarp -t_srs '+proj=tpers +azi=19 +tilt=30 +lon_0=-109.5 +lat_0=23 +h=1274199.4 ...
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23 views
How do I add elevation data to a GeoJSON line from a GPX file?
I understand that elevation can be added as an optional third value in Coordinates (lat, long, elev) in a geojson file, but I can't find a way to actually do that from a gpx file. I've used ogr2ogr to ...
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1answer
18 views
GDAL: What is the best way to test if a CPLString is not empty?
If I define a CPLString this way:
CPLString osString;
And I want to check if osString is not empty, what would be the best way?
My bet:
if (osString.c_str() == NULL)
But I find it a little ...
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27 views
GDAL: add metadata to Bands when creating new GeoTIFF
This is a metadata question :-).
I am processing airborne laser scanning full-waveform data to extract information and I store this information by creating a multiband GeoTIFF using GDAL. I will have ...
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13 views
Draw Image from GRIB2 file using GDAL
We were using OpenGrads to generate .PNG image for significant wave height from .ctl files (Generated using OpenGrads from GRIB files downloaded from NOAA). Google uses Web Mercator projection and ...
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1answer
27 views
informations about “gdaltransform” utility of GDAL
I have a doubt about GDAL reprojection.
I use "gdalwarp" utility to reproject an image in a specific projection system (for example WGS84 UTM49).
"gdalinfo" on original image displays this corner ...
1
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1answer
45 views
Python GDAL: find out spikes and pits in DEM
I'm working with on a DEM (Geotiff) in Python GDAL, and I'd like to find out the spikes or pits in my terrain.
I have no idea how to proceed, does anyone have good algorithm to help me out?
Thanks,
eo
...
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22 views
How to set GDAL/cs2cs/proj to use NTv2 grid shift file when using EPSG codes?
I am using the GDAL API for Python for a script that takes only EPSG codes for inputs to specify source and target coordinate systems.
While the cs2cs command seems to handle quite well ...
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29 views
Python GDAL/OGR: check lines geometries connectivity
I'm working with shapefiles representing roads, so basically it's stored as (poly)lines.
I need to perform a road connectivity checking. In other words, I want to ensure that roads meant to ...
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18 views
GDAL Utilties - Multiple Bands with Different Output Types
I have a raster dataset with 5 bands. 4 of the bands are 8bit unsigned and the 5th band is 32bit floating point. I need to clip the dataset into tiles using GDAL (I'm using gdalwarp with a cutline ...
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1answer
20 views
Where can I find a python GDAL 1.8.0 package?
I have python 2.7.4 installed on my RHEL 5 machine along with gdal-devel-1.8.0 and gdal-1.8.0. I tried to install the GDAL 1.9.1 package available on python's page ...
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43 views
Installation of GDAL 1.10 in Windows 8 and Ubuntu 12.04
Is there an easy way to install GDAL/OGR 1.10 in Windows 8 and Ubuntu 12.04.
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34 views
setup Mapserver WMS from tile files
I'm totally new to Mapserver and I've been banging my head trying to figure out how to mount a WMS server that will seed images of a small geographical area to a OpenLayers HTML page.
I already ...
3
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1answer
39 views
circle detection on binary image
My image is gray scale image which i have converted to binary by smoothing and then edge detection method. Now i want to place the circle /ellipse on edge detected. I don't know how to proceed ...
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1answer
34 views
Why gdalwarp cannot make transparent black nodata?
I have a MODIS ariel image geotiff and I want to remove black nodata pixel (this is Aerosol Of Thickness) 1 band image.
I've done like this C:>convert -transparent black ...
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1answer
55 views
GDAL/Python: How do I get coordinate system name from SpatialReference?
In Python, using GDAL, I've extracted a raster's projection as a WKT string as follows:
wkt = dataset.GetProjection()
# wkt is ...
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1answer
16 views
python gdal_polygonize error
I am trying to use gdal_polygonize to create a polygon from a binary raster.
My code is:
os.system('gdal_polygonize.py ' + filename + ' -f ESRI Shapefile ' + shapefile)
where filename is a string ...
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1answer
18 views
OGR UnionCascaded gives strange lines (flat polygons)
I'm using OGR to perform a union using UnionCascaded. All my polygons have been created by GDAL polygonize which ensures that all polygons follow pixel edges and should therefore align nicely. But I ...
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31 views
Support for Arc/Info Binary Grid format by C#-bindings of GDAL [migrated]
I want to read Arc/Info Binary Grids and convert them to other image formats using the C#-bindings of GDAL. I installed FWTools 2.4.7 and the current binaries (MSVC2010 (Win64) -stable) from here. ...
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1answer
104 views
CSV and GDAL 1.10 in QGIS
It seems the GDAL upgrade from 1.9 to 1.10 changed the way CSV files are handled so that I now have a non-functioning QGIS. App hangs trying to import csv data file when previously had no problems ...
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48 views
Using gdal to convert from UTM to equidistant lat/lon
I am getting rather confused with converting a UTM gridded dataset into a equidistant/rectangular latlon gridded dataset. Can anybody help me?
I have a UTM set with the following projection:
...
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15 views
How to correctly create virtual catalog from rasters with overlapping alpha band in QGIS?
I'm trying to make a mosaic (and then a pyramid) of historic map tiles.
Every map tile has a border, I got rid of it with gdalwarp (adding an alpha band and specifying the border, as I stated here).
...
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34 views
QGIS GDAL polygonize - how to set scale
I've got some old contour plots, paper copy only, that I'd like to be able to put into QGIS. I get as far as a successful polygonize into shp and it looks fine, but the scale is wrong. How might I ...
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43 views
How can I call gdal_translate from Java code?
How can I execute gdal_translate in Java? For example, will something like this work?
gdal_translate "PG:host=localhost dbname='xyzy' schema=public' table='xyz'" "d:\xyx\ab.tiff"
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32 views
cut tiles with gdal2tiles.py from a png with world coordinate info
I have a collection of PNG files that use the standard google maps projection and have baked into the filename of each the zoom level (all of them are at 22), the x and y pixel coordinates of the ...
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1answer
65 views
GDAL bindings problem with ArcMap 10.1 Python tool
I'm really getting mad with this. ArcGIS sometimes can be so just...irritating!
Forgive me if this question is by any means duplicating this one or similar ones, but I really can't find my way out of ...
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1answer
101 views
Assign projection to a satellite image
Today I stumbled upon a picture taken from the ISS looking down Europe and it is really beautiful.
So, I started thinking I could add more to the picture. Like world borders, cities, road network, ...
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1answer
67 views
Is it possible to use GDAL to combine (rather than mosaic) rasters
Is there a GDAL command which can combine multiple rasters so that a unique output value is assigned to each unique combination of input values, like the combine command in ArcGIS?
gdal_merge seems ...
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16 views
how to stretch GMT raster with gdal to work with google
How can I stretch a PNG raster coming from GMT (Generic Mapping Tools 4.5.6) in such a way that does align with google satellite or bing? such raster is in wgs84 and crosses two UTM zones (17 and 18 ...
2
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3answers
99 views
How to test if geometry is inside another?
I need to tell whether geometries from a shapefile are inside other geometries or not.
For example, I want to test if there are trees (represented as points in trees.shp) inside the urban areas ...
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0answers
19 views
Change offset of geotiff file [migrated]
I need to change the offset of some tiff files that I am exporting from Qgis.
Qgis gives them a offset of 0xbd72, while the program I need to load them in to only reades files with an offset of ...
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1answer
29 views
Local variance image in python using gdal and a running window approach
I want a local variance image with a 3x3 of a geospatial raster image using python. My approach so far was to read in the raster band as an array, then using matrix notation to run a moving window and ...
2
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1answer
134 views
convert from HDF to GeoTiff
I am having some problems with the conversion from HDF to GeoTiff.
I am following the steps described in this webpage.
The problem is that I can't find what is the NDVI subdataset name (XXXX) in ...
7
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1answer
104 views
How to rename field names in a shapefile?
I need to rename the field names (attributes) in a shapefile. Is there an easy way to do this from the command line?
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1answer
68 views
Python GDAL: Save array as raster with projection from other file
I have an array of data, and for each datapoint I know the latitude and longitude. I'd like to save it as a GTiff with the same projection as other rasters I have. This is what I've tried so far, but ...
2
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1answer
76 views
OGR - Weird GeomType -2147483645 on polygon shapefile
I am trying to import a shapefile (multipolygon) in an app with ogr but I got an error about invalid geom type. If I inspect the data with ogr like this:
datasource = ogr.Open("c:\\temp\\data.shp")
...
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1answer
64 views
Export KML ExtendedData with OGR2OGR
I would like to export with ogr2ogr the data I have in a kml as ExtendedData
<Placemark>
<ExtendedData>
<SchemaData schemaUrl="#15540_punti">
...
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1answer
84 views
OGR OSM-driver unable to open datasource
I want to read an OSM file with OGR. I use Version GDAL 1.9.1, released 2012/05/15.
To read a SQLITE file works fine:
$ ogrinfo test.sqlite
INFO: Open of `test.sqlite'
using driver `SQLite' ...
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4answers
98 views
Get vector features inside a specific extent
The problem:
I have a very large vector layer with many features and a much smaller raster layer in a defined region. I want to get only those vector features which are within the raster layers ...
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0answers
19 views
Filled contour plots with gdal
I have values of a certain quantity (concentration) defined on an irregular (georeferenced) grid which I want to visualize in the form of filled contours. Originally, I wanted to create simple vector ...
2
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0answers
66 views
Why do I get different output from gdal2tiles vs. maptiler?
I am trying to generate map tiles using gdal2tiles for an area much larger than MapTiler can handle. However, my tile caches are not showing up on the maps. I checked gdal2tiles by running the same ...
6
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1answer
151 views
How to get raster corner coordinates using Python GDAL bindings?
Is there a way to get the corner coordinates (in degrees lat/long) from a raster file using gdal's Python bindings?
A few searches online have convinced me that there is not, so I have developed a ...
