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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3
votes
1answer
823 views

Open-source projects that use DotSpatial?

I'm intrigued by what I see with DotSpatial, mainly for its C# interface with GDAL. I've downloaded the source (and the 3.5 x86 package) and I'm a bit stuck with using the GDALHelper class to ...
2
votes
1answer
2k views

What are the appropriate parameters to convert .asc file to geotiff using gdal_translate?

My starting file of interest is an ASC file with the following gdalinfo Driver: AAIGrid/Arc/Info ASCII Grid Files: sd_1_3_110805.asc Size is 11880, 9720 Coordinate System is `' Origin = ...
1
vote
1answer
1k views

ImportError: 'No module named pyproj'

im running mac os X with native python 2.6.1 install . Later today installed GDAL complete pkg, and added the program to the shell path on the terminal with the folowing cmd : ~: echo "export ...
6
votes
2answers
328 views

Clarification of the “25D” option in ogr2ogr

[EDIT: In my original post, I had received an error that was based on a typo, so I scrapped that part of the question, but left the questions that still apply.] In the ogr2ogr docs it says: -nlt ...
8
votes
4answers
1k views

Performance of google map tile creation processes

I know that question is rather vague but please bear w/me. I'm trying to get an idea of what sort of product performance - specifically timing - people have seen for various methodologies they have ...
9
votes
3answers
1k views

getting dxf files out of PostgreSQL

I've successfully loaded a bunch of shapefiles into a PostGIS database. I would like to be able to retrieve specific geometry and layers as dxf files based on SQL queries. I'm using PostGIS, GDAL, ...
3
votes
2answers
2k views

ogr2ogr srs options: where is the well known definition determined?

In the ogr2ogr documentation it says that when using -a_srs srs_def: Srs_def can be a full WKT definition (hard to escape properly), or a well known definition (ie. EPSG:4326) or a file with a WKT ...
5
votes
1answer
879 views

Rescale Raster Band With GDAL Python Bindings

I am trying to figure out how to rescale a raster band's pixel value using the GDAL python bindings. I am looking to emulate the -scale switch in gdal_translate.exe; rescaling the pixel values in my ...
5
votes
3answers
806 views

Reading palsar k&c 50 data in GDAL or other open source application

I posted this inquiry in the grass-user list. JAXA is providing free access to PALSAR 50m Orthorectified K & C Mosaic. According to the website, data are provided in: Data files (Raw ...
2
votes
1answer
367 views

Ruby bindings to GDAL

I'm looking for a guide on how to get up and running with ruby and gdal on Mac. I've seen some examples on how to use gdal in ruby but never found any tutorials on where to download and install it. ...
9
votes
2answers
7k views

Converting projected geoTiff to WGS84 with GDAL and Python

Apologies if the following question is somewhat stupid, but I am only VERY new to this whole GIS thing. I am trying to convert some projected geoTiff images to WGS84 using gdal in python. I have ...
9
votes
2answers
3k views

Difference between Geoserver stores: ImageMosaic, WorldImage, ImagePyramid

What are the differences between the Geoserver stores ImageMosaic, WorldImage, and ImagePyramid? I noticed that ImagePyramid is no longer included in the latest Geoserver. Is one of these more ...
6
votes
1answer
1k views

What tile/tiling strategy should I use with GeoNode/GeoServer?

I've got a wicked GeoNode instance running, loaded with some basic vector data. I want to be able to serve our local-County aerial imagery as a basemap within GeoNode. I am thoroughly overwhelmed with ...
9
votes
4answers
3k views

installing GEOS, PROJ, GDAL/OGR into a python virtualenv on Mac OS X

I am trying to setup an isolated python virtualenv to work on GIS projects on my Mac OS X. Sounds like I will need to install the GEOS, PROJ, GDAL/OGR from the kyngchaos site here ...
2
votes
1answer
179 views

gdalwarp results all black

I'm trying to convert a bmp image in BNG to WGS84 using gdalwarp (via QGIS). It seems to be running without errors but the output is all black. What am I doing wrong?
3
votes
1answer
255 views

How to write binary ArcGRIDs outside of ArcGIS in linux?

I've been looking for a way to create\write binary formatted ArcGRID images in Linux without much luck. It seems the GDAL project only supports reading these files, but there is not write support. ...
5
votes
1answer
323 views

GDAL and ArcObjects in The Same Project - A Recipe For Disaster?

I am working on a project where I am attempting to use GDAL and ArcObjects together in the same project. Although the project itself is nothing more than a toolbar in ArcMap, I would like to use some ...
4
votes
1answer
805 views

Best GeoDjango MySQL workaround for distance queries

I'm using mysql 5.1.50, so the distance QuerySet method is not available to me. Here is my model: class Location(models.Model): name = models.CharField(max_length='100') point = ...
16
votes
6answers
5k views

How to cut a 'tiled image' from a raster dataset using GDAL?

I am working on an app that needs to create tiles (jpeg) from a given raster dataset. My initial inclination was to use gdal2tiles.py, but its performance seems like it could be improved. That leads ...
6
votes
2answers
3k views

How should I use GDAL to perform a transformation?

Greetings, I am a student who wishes to use GDAL to transform a series of images from Lambert Conformal Conic (EPSG: 9802) to Google Earth's WGS 84 (EPSG: 4326) for a web mapping project. I know ...
3
votes
3answers
908 views

Mosaic the output of gdal2tiles

I have a folder with a gdal2tiles output: 6 levels of zoom (and folders), with subfolders and .png tiles. Is there a gdal tool to merge in a single geotiff file these .png tiles? Thank you very ...
3
votes
2answers
562 views

gdalwarp outline artifact

I'm using gdal to warp images into a different map-projections. However the warping processs seem to leave grey marks where the boundary of the original image was (see warped.png below). I figured out ...
3
votes
1answer
952 views

Loading Tiger 2010 Edge Shape File w/ ogr2ogr Produces Reversed Latitude and Longitude

I'm attempting to build a MySQL database that will allow me to reverse geo-code addresses using the MBR functions within MySQL. I've downloaded the latest set (2010) of TIGER edge shape files from ...
7
votes
2answers
874 views

gdal2tiles misalignment

I have a map image that I have reprojected from OSGB36 to googleMaps projection (EPSG:900913). When I run gdal2tiles on the reprojected map, the results are not alligned with the google maps images ...
5
votes
2answers
3k views

How do I use GDAL to convert from an arbitrary projection/datum into Equirectangular/WGS84?

I've been trying to use GDAL to convert from an arbitrary projection/datum into Equirectangular (aka Plate Caree, aka Equidistant Cylindrical, aka Geographic, aka Lat/Long) with WGS84 datum. All of ...
4
votes
1answer
515 views

GDAL Pixel Functions question

I am writing a program in python that converts raster files using gdal, and using VRT as an intermediate format. One of the things that i need to do is convert bands between different formats. I am ...
13
votes
3answers
6k views

How do I change geotiff “no data” color to white/transparent rather than black?

I am preparing data for inclusion into a geonetwork node, where the maps are displayed via geoserver. The problem is that cells that have"no data" are displaying as black in the geotiff and I am would ...
12
votes
3answers
7k views

How to georeference a web mercator tile correctly using gdal?

As an example I will take the following tile http://a.tile.openstreetmap.org/3/4/2.png and save it as "4_2.png". The WGS84 coordinates of this tile can be calculated or read there by clicking the ...
7
votes
2answers
3k views

Deploying Application With C# GDAL/OGR Bindings

I developed a relatively simple web app that uses the C# OGR bindings to do a couple of simple geometric functions; buffer, clip...etc. I developed this application on my local machine, which has ...
4
votes
2answers
677 views

Maturity of Mapserver mapscript C# bindings?

I've been thinking about possibly porting an internal custom GIS application built on top of Python / PyQt / Mapscript / GDAL-OGR / PostGis to C#. I was wondering about the maturity of the C# ...
6
votes
3answers
1k views

GDAL and Geospatial PDF on Windows

GDAL 1.8 now supports reading GeospatialPDF, see pdf format description page. Using it depends on the poppler pdf library. What is the smoothest route to getting gdal and geospatial pdf working on ...
6
votes
1answer
424 views

BigTIFF support in libraries?

What is the level of support for BigTIFF in image processing libraries? GDAL supports this functionality so long as you're building against libtiff4(beta), and I would assume most open source C ...
2
votes
1answer
260 views

I wish to reproject a hypertile image from GDA94/Zone 55 to a flat planar image

please bear with this newbee as I am just getting into this extremely interesting field. My Problem: I have setup Hypertiles to use the GDALCompress batch file to mosaic my image - all good so far - ...
4
votes
3answers
2k views

reprojecting geotiffs to spherical mercator using gdalwarp

I would like to reproject raster images (tiffs+proj+tfw) files too "google's" projection using gdalwarp. From what I understand, google uses epsg:900913/epsg:3785. What I don't know is how to ...
6
votes
4answers
3k views

Converting huge geotiffs to tilepyramid

I'm trying to convert a 20 GB LZW compressed geotiff to a tilepyramid using gdal2tiles. Unfortunately, gdal2tiles seems not to be able to handle this, after running it for 10 hours it still hasn't ...
36
votes
10answers
21k views

How to install GDAL with Python on windows?

Can anyone please explain to me in step by step instructions how to install GDAL/OGR with Python on Windows. I have Windows Vista and I have tried following the information on the website and it does ...
5
votes
1answer
773 views

Programmable buffers using GDAL and python

Is there a way to programmatically generate buffer layers for vector layers using GDAL and python?
8
votes
3answers
2k views

gdalmerge produces file that is much too large

I'm trying to merge 60 geotiff files into one huge file in order to be able to product tiles from that resulting huge geotiff file by using gdal2tiles. The merge process worked, but for some reason ...
2
votes
3answers
1k views

Creating GeoTiff from Tiff+WorldFile+Proj

I'm currently using the global mapper export function to convert my tiffs+worldfile+projection file to geotiff. Is there a commandline tool (for Linux) that lets me do the same thing? "gdaltranslate" ...
5
votes
1answer
568 views

What is north-up projection?

How do I know what projection to use for north-up or 0 rotation? I have a gtiff (ND83-nf) that gives me the error when importing to Grass. Should I re-project or recreate the image with the rotation ...
4
votes
1answer
2k views

How to resample a batch of rasters using OGR/GDAL?

I'm looking for a function similar to GRASS r.resample. I have a folder full of TIF files and want to reduce their resolution ("scale them down") to reduce file size.
2
votes
4answers
480 views

OGR OVF has no identified FID column

I have an OVF layer defined as follows: <OGRVRTDataSource> <OGRVRTLayer name="UserPoint"> <SrcDataSource>ODBC:un/pw@CLO</SrcDataSource> ...
18
votes
6answers
5k views

Should GDAL be set to produce GeoTIFF files with compression? Which algorithm should be used?

I have a folder of GIS data that consists mainly of GeoTIFF files. The whole set weighs in at about 1.2 GB. I noticed that if I pack the contents into a tarball, it smashes down to about 82 MB. I ...
0
votes
3answers
425 views

Need help understanding why gdal projections aren't giving me what I expect?

When using gdaltranslate and gdalwarp I specify the following transfomation (in for GCP's and translate, out for warp) +proj=lcc +lat_1=40.03333333333333 +lat_2=38.73333333333333 +lat_0=38 ...
9
votes
7answers
5k views

How to get raster image as array in Python with ArcGIS

When starting to work with Python and ArcGIS 9.3, I assumed there would be a simple way to get a raster image into a Python array so that I can manipulate it before storing it back as another raster ...
7
votes
3answers
2k views

Make the nodata area of a resampled orthophoto overview white?

I have a set of orthophoto images which are each fully filled with data, but when placed together the coverage does not form a rectangle so there are nodata areas. In MapGuide, I need to be able to ...