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.
0
votes
1answer
30 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 ...
1
vote
1answer
15 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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votes
1answer
23 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 ...
4
votes
1answer
44 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 ...
9
votes
2answers
641 views
How to call gdal_translate from Python code?
Is it possible to use some gdal API to call gdal_translate from Python code? I do not mean simply executing the gdal_translate.py from the file system, but rather call it somehow in code so I do not ...
2
votes
1answer
113 views
USGS GeoTiff extent via GDAL
I have 2006 land cover GeoTiff from the USGS site (for a county in VA, USA). The projection is Albers Conical Equal Area Units. The download came with an HTML metadata file that tells me the geo ...
0
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0answers
20 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 ...
1
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1answer
17 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 ...
1
vote
2answers
655 views
Clean way to install gdaltools plugin for QGIS on OSX
I have qgis 1.8.0 on osx mountain lion and am installing the gdaltools 1.2.29. I have run into a problem that a number of people are seeing. The plugin cannot find my gdal python (see below).
...
1
vote
1answer
37 views
gdal_retile.py and gdal_translate Requirements
I basically need to use two GDAL utilities: gdal_retile.py and gdal_translate, on a Solaris 9 machine. I have tried compiling GDAL from sources, but this seems not to be working. So, since I have ...
1
vote
1answer
20 views
gdal_retile.py tile naming scheme
Is there a way to define custom tile names during a gdal_retile.py process, other than the default _01_01. For instance, suppose I want to start naming my tiles at 100_100, is this possible?
-4
votes
1answer
47 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 ...
0
votes
1answer
38 views
gdalwarp cant find libproj.dlib
Thought I had finally got Python, gdal and QGIS to play nicely together but just tried to do a batch transform using a bash script to call gdalwarp and it claimed it couldn't read the libproj.dlib ...
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votes
0answers
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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0answers
45 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 ...
0
votes
1answer
63 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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0answers
26 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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0answers
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 ...
1
vote
1answer
43 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
...
1
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0answers
25 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 ...
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0answers
18 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 ...
0
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0answers
26 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 ...
5
votes
2answers
330 views
Tiling high resolution image using GDAL tools
I have a .tif image that I georeferenced using QGIS utility. It was originally in UTM with NAD83 as datum.
I need to make tiles out of it and get a kml file to overlay onto google earth.
Here's how I ...
2
votes
3answers
98 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 ...
1
vote
1answer
19 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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0answers
17 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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0answers
40 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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votes
0answers
33 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 ...
1
vote
1answer
188 views
Slow tiles generation for leaflet js
I am currently trying to use leaflet to display images (jpeg or png) instead of maps, I have followed the instructions on this blog post to create the tiles using gdal2tiles.py here is the code we ...
3
votes
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 ...
2
votes
1answer
53 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 ...
0
votes
1answer
185 views
Installing GDAL with Java Bindings (gdal.jar) on Ubuntu 12.10
I am trying to build a postgis importer for mutliple shapefiles. After geotools took orders of magnitude longer than shp2pgsql to import my data, I decided to attempt to use the java bindings to GDAL ...
0
votes
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 ...
2
votes
1answer
85 views
Driver Error : DTM to Raster using GDAL_GRID
I am looking to interpolate a DTM (eventually over 4,000 DTMs) that is in a personal geodatabase format. I would like to do this in as few step as possible, eventually writing a batch script to do ...
2
votes
1answer
114 views
gdal_retile question
I have been trying to get gdal_retile working with the --optfile command. At first it did not work because in my files.txt I have '-' characters in the filename. I tried adding quotes around the ...
0
votes
1answer
71 views
GeoTIFF: How to remove Internal Overview without recompression
"gdaladdo -clean" does not remove the internal overview from the file see http://trac.osgeo.org/gdal/ticket/4940
How do I remove GeoTIFF overview(s) without having to re-compress the main image.
11
votes
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, ...
1
vote
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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votes
0answers
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. ...
2
votes
2answers
500 views
Create a ground overlay kml from georeferenced raster
I have a world georeferenced raster (5m resolution, ~4000 x 4000 pixels) that I would like to display in google earth. I am looking for a simple and effective way to generate this kml file.
Using ...
0
votes
1answer
102 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 ...
4
votes
1answer
244 views
How to create tiles with points from MongoDB?
I have a (potentially) large data set stored in MongoDB. Each record is just lat, lon and some float-point value. Each pair of lat and lon is unique, but the whole set is not covering the Earth, there ...
0
votes
0answers
30 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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0answers
46 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:
...
3
votes
1answer
73 views
OGR Info - Check for spatial index?
If we want to get information about a vector layer (shapefile for example) we could use ogrinfo:
ogrinfo -so myshapefile.shp mylayer
This returns a lot of pertinent information about the shapefile. ...
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votes
0answers
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).
...
3
votes
1answer
474 views
How do you open shapefiles with ogr2ogr
I'm following along the D3 tutorial, and on this line:
ogr2ogr \
-f GeoJSON \
-where "adm0_a3 IN ('GBR', 'IRL')" \
subunits.json \
ne_10m_admin_0_map_subunits.shp
run into the following ...
1
vote
0answers
42 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"
0
votes
0answers
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 ...
0
votes
1answer
99 views
How to clip raster by multiple polygons in multi rasters?
Using QGIS, I want to clip a raster by multiple polygons contained in a single shapefile. I read that gdalwarp can clip my raster by multiple polygons BUT the output is a single merged clipped raster. ...
