Re: [gdal-dev] gdal_calc.py: produce median raster
Dear Simen, You can refer to each band explicitly using the --A_band option. Try something like this gdal_calc.py -A infile --A_band 1 -B infile --B_band 2 -C infile --C_band 3 --outfile outfile --calc median(A,B,C) - Chris *Dr Chris Yesson* *Institute of Zoology, Zoological Society of London* *Tel: 020 7449 6267* *email: chris.yes...@ioz.ac.uk chris.yes...@ioz.ac.uk**web: http://www.zsl.org/chrisyesson/ http://www.zsl.org/chrisyesson/* *Note: I work Mon-Thurs and do not check email on Fri* On 25 November 2014 at 07:44, Simen Langseth simlan...@gmail.com wrote: Dear Respected Authors: I would be grateful if you could share any hints on it. On Tue, Nov 25, 2014 at 4:33 PM, Simen Langseth simlan...@gmail.com wrote: Dear Marius Jigmond: Thanks for your attempt. Unfortunately, it is producing 3 band outfile, rather than 1 band median image. I could not figure out what this code computed, all the resulted 3 bands images are also different. I hope someone can help me. On Tue, Nov 25, 2014 at 12:09 PM, Marius Jigmond mariusjigm...@hotmail.com wrote: Does the following work: gdal_calc.py -A infile --allBands=A --outfile=outfile --calc=median(A) -- Date: Mon, 24 Nov 2014 19:14:06 +0900 From: simlan...@gmail.com To: gdal-dev@lists.osgeo.org Subject: [gdal-dev] gdal_calc.py: produce median raster I have one GeoTiff file with 3 bands. I want to produce a raster file computing pixel wise median value for the three raster bands. How can I do that? I tried as follows: gdal_calc.py -A infile --allBands --outfile outfile --calc median(A) But could not get any out file. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev This message has been scanned for viruses by MailControl http://www.mailcontrol.com/, a service from BlackSpider Technologies http://www.blackspider.com/. Click here https://www.mailcontrol.com/sr/MZbqvYs5QwJvpeaetUwhCQ== to report this email as spam. The Zoological Society of London is incorporated by Royal Charter Principal Office England. Company Number RC000749 Registered address: Regent's Park, London, England NW1 4RY Registered Charity in England and Wales no. 208728 _ This e-mail has been sent in confidence to the named addressee(s). If you are not the intended recipient, you must not disclose or distribute it in any form, and you are asked to contact the sender immediately. Views or opinions expressed in this communication may not be those of The Zoological Society of London and, therefore, The Zoological Society of London does not accept legal responsibility for the contents of this message. The recipient(s) must be aware that e-mail is not a secure communication medium and that the contents of this mail may have been altered by a third party in transit. If you have any issues regarding this mail please contact: administra...@zsl.org. ___ This message has been scanned for viruses by MailControl http://www.mailcontrol.com/, a service from BlackSpider Technologies http://www.blackspider.com/. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] gdal_calc.py: produce median raster
Dear Dr Chris Yesson Thanks for your quick response. I got the following error: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()` Perhaps the expression for calc seems to be revised... On Tue, Nov 25, 2014 at 4:59 PM, Chris Yesson chris.yesson@gmail.com wrote: Dear Simen, You can refer to each band explicitly using the --A_band option. Try something like this gdal_calc.py -A infile --A_band 1 -B infile --B_band 2 -C infile --C_band 3 --outfile outfile --calc median(A,B,C) - Chris *Dr Chris Yesson* *Institute of Zoology, Zoological Society of London* *Tel: 020 7449 6267* *email: chris.yes...@ioz.ac.uk chris.yes...@ioz.ac.uk**web: http://www.zsl.org/chrisyesson/ http://www.zsl.org/chrisyesson/* *Note: I work Mon-Thurs and do not check email on Fri* On 25 November 2014 at 07:44, Simen Langseth simlan...@gmail.com wrote: Dear Respected Authors: I would be grateful if you could share any hints on it. On Tue, Nov 25, 2014 at 4:33 PM, Simen Langseth simlan...@gmail.com wrote: Dear Marius Jigmond: Thanks for your attempt. Unfortunately, it is producing 3 band outfile, rather than 1 band median image. I could not figure out what this code computed, all the resulted 3 bands images are also different. I hope someone can help me. On Tue, Nov 25, 2014 at 12:09 PM, Marius Jigmond mariusjigm...@hotmail.com wrote: Does the following work: gdal_calc.py -A infile --allBands=A --outfile=outfile --calc=median(A) -- Date: Mon, 24 Nov 2014 19:14:06 +0900 From: simlan...@gmail.com To: gdal-dev@lists.osgeo.org Subject: [gdal-dev] gdal_calc.py: produce median raster I have one GeoTiff file with 3 bands. I want to produce a raster file computing pixel wise median value for the three raster bands. How can I do that? I tried as follows: gdal_calc.py -A infile --allBands --outfile outfile --calc median(A) But could not get any out file. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev This message has been scanned for viruses by MailControl http://www.mailcontrol.com/, a service from BlackSpider Technologies http://www.blackspider.com/. Click here https://www.mailcontrol.com/sr/MZbqvYs5QwJvpeaetUwhCQ== to report this email as spam. The Zoological Society of London is incorporated by Royal Charter Principal Office England. Company Number RC000749 Registered address: Regent's Park, London, England NW1 4RY Registered Charity in England and Wales no. 208728 _ This e-mail has been sent in confidence to the named addressee(s). If you are not the intended recipient, you must not disclose or distribute it in any form, and you are asked to contact the sender immediately. Views or opinions expressed in this communication may not be those of The Zoological Society of London and, therefore, The Zoological Society of London does not accept legal responsibility for the contents of this message. The recipient(s) must be aware that e-mail is not a secure communication medium and that the contents of this mail may have been altered by a third party in transit. If you have any issues regarding this mail please contact: administra...@zsl.org. ___ This message has been scanned for viruses by MailControl http://www.mailcontrol.com/, a service from BlackSpider Technologies http://www.blackspider.com/. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Call for discussion on RFC 51: RasterIO() improvements : resampling and progress callback
On 25 November 2014 at 05:34, Even Rouault even.roua...@spatialys.com wrote: Otherwise I have not much to say about this RFC. Blurring has two r's, Fixed Gaussian blur also has another complexity, since it's output dimensions depend on the fftconvolve mode (using scipy.signal docs http://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.signal.fftconvolve.html). For example, to blur a DTM and maintain the same output dimensions and geotransform, the mode would need to use a 'valid' convolution with a padded input array. This padded array would also have a mode (similarly from numpy docs http://docs.scipy.org/doc/numpy/reference/generated/numpy.pad.html), such as 'symmetric'. http://gis.stackexchange.com/a/10467/1872 Someone else may want to blur a DTM without using a padded array, and just return a smaller array with modified geotransform. And a different blur would expand the output dimension and modify the geotransform using a 'full' fftconvolve mode, using a 'constant'=0 padded array. An example of this is to blur a polygon that barely extends to the shape's extent, but maintain the blur beyond the initial extent. The constant value would also need to be supplied, as a value of 0 for numpy is default. http://gis.stackexchange.com/a/104338/1872 So in summary, I'm not sure how GDAL could best cover all combinations of padding and convolution modes, except to offer a few prepared use-cases, or somehow provide extra parameters. Or just provide a single use case, similar to Gaussian blur routines in various raster editing software. -Mike ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] GDAL Driver for MongoDB
Shuai, I may have the opportunity to integrate your driver in the future. I just wanted to make sure you had the right to contribute this work under the X/MIT license. From some headers like in https://github.com/mongogis/mongodb-gdal- driver/blob/master/mongo/ogr_mongo.h, I see Nanjing University mentionned, and/but you above email is @illinois.edu. If this work was done for your studies, you'd likely check with your supervisor if it can be released under the X/MIT license. See the Legal section of https://trac.osgeo.org/gdal/wiki/rfc3_commiters If you confirm that everything is OK, please answer back to the list stating so. Thanks, Even Hi there, I wrote a GDAL driver for mongodb, and uploaded it in the githubhttps://github.com/mongogis/mongodb-gdal-driver. Feel free to grab and use the driver. Just let me know if you have any questions or suggestions. Thanks, shuai -- Spatialys - Geospatial professional services http://www.spatialys.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] Call for discussion on RFC 51: RasterIO() improvements : resampling and progress callback
Mike, The gaussian resampling is the one already available for gdaladdo, that was added per http://trac.osgeo.org/gdal/ticket/2137 and http://trac.osgeo.org/gdal/changeset/15323 Basically : - for a downscaling of factor between 1 and 2 (and for upscaling as well), it will use a 3x3 kernel - for a downscaling of factor between 2 and 4, it will use a 5x5 kernel - beyond it will use a 7x7 kernel. I understand that gaussian blur can/could be parametrized in more complex ways. If there are improvements in that area, additional parameters could likely be passed through the GDALRasterIOExtraArg structure. I've also wondered if the resampling algorithm couldn't be specified as a string instead of an enumerated value. In which case you could have had things like gauss_x_y with x and y as parameters. I don't have strong preference for one way or the other one. And both already exist in GDAL : the GDAL warping API uses an enumerated value, the GDAL overview API uses a string... Even On 25 November 2014 at 05:34, Even Rouault even.roua...@spatialys.com wrote: Otherwise I have not much to say about this RFC. Blurring has two r's, Fixed Gaussian blur also has another complexity, since it's output dimensions depend on the fftconvolve mode (using scipy.signal docs http://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.signal.fft convolve.html). For example, to blur a DTM and maintain the same output dimensions and geotransform, the mode would need to use a 'valid' convolution with a padded input array. This padded array would also have a mode (similarly from numpy docs http://docs.scipy.org/doc/numpy/reference/generated/numpy.pad.html), such as 'symmetric'. http://gis.stackexchange.com/a/10467/1872 Someone else may want to blur a DTM without using a padded array, and just return a smaller array with modified geotransform. And a different blur would expand the output dimension and modify the geotransform using a 'full' fftconvolve mode, using a 'constant'=0 padded array. An example of this is to blur a polygon that barely extends to the shape's extent, but maintain the blur beyond the initial extent. The constant value would also need to be supplied, as a value of 0 for numpy is default. http://gis.stackexchange.com/a/104338/1872 So in summary, I'm not sure how GDAL could best cover all combinations of padding and convolution modes, except to offer a few prepared use-cases, or somehow provide extra parameters. Or just provide a single use case, similar to Gaussian blur routines in various raster editing software. -Mike -- Spatialys - Geospatial professional services http://www.spatialys.com ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] gdal_calc.py: produce median raster
That's because numpy.median expects one array and keyword arguments, not three arrays. It's unclear to me what gdal_calc.py does under the hood (I admit I did not read it) but the correct way to get the median of the three bands would be: --calc median([A,B,C], 0) The strange part is that--calc median([A,B,C])works as well and generates a different output. When axis is not specified median should return a single value. At this point I suggest you take three 2D arrays, calculate their median as a 2D array, convert the three arrays to rasters, run gdal_calc.py and compare results. -marius Date: Tue, 25 Nov 2014 17:56:46 +0900 From: simlan...@gmail.com To: chris.yes...@ioz.ac.uk CC: gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] gdal_calc.py: produce median raster Dear Dr Chris Yesson Thanks for your quick response. I got the following error: ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()` Perhaps the expression for calc seems to be revised... On Tue, Nov 25, 2014 at 4:59 PM, Chris Yesson chris.yesson@gmail.com wrote: Dear Simen, You can refer to each band explicitly using the --A_band option.Try something like this gdal_calc.py -A infile --A_band 1 -B infile --B_band 2 -C infile --C_band 3 --outfile outfile --calc median(A,B,C) - ChrisDr Chris Yesson Institute of Zoology, Zoological Society of LondonTel: 020 7449 6267 email: chris.yes...@ioz.ac.uk web: http://www.zsl.org/chrisyesson/ Note: I work Mon-Thurs and do not check email on Fri On 25 November 2014 at 07:44, Simen Langseth simlan...@gmail.com wrote: Dear Respected Authors: I would be grateful if you could share any hints on it. On Tue, Nov 25, 2014 at 4:33 PM, Simen Langseth simlan...@gmail.com wrote: Dear Marius Jigmond: Thanks for your attempt. Unfortunately, it is producing 3 band outfile, rather than 1 band median image. I could not figure out what this code computed, all the resulted 3 bands images are also different. I hope someone can help me. On Tue, Nov 25, 2014 at 12:09 PM, Marius Jigmond mariusjigm...@hotmail.com wrote: Does the following work: gdal_calc.py -A infile --allBands=A --outfile=outfile --calc=median(A) Date: Mon, 24 Nov 2014 19:14:06 +0900 From: simlan...@gmail.com To: gdal-dev@lists.osgeo.org Subject: [gdal-dev] gdal_calc.py: produce median raster I have one GeoTiff file with 3 bands. I want to produce a raster file computing pixel wise median value for the three raster bands. How can I do that? I tried as follows: gdal_calc.py -A infile --allBands --outfile outfile --calc median(A) But could not get any out file. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev This message has been scanned for viruses by MailControl, a service from BlackSpider Technologies. Click here to report this email as spam. The Zoological Society of London is incorporated by Royal Charter Principal Office England. Company Number RC000749 Registered address: Regent's Park, London, England NW1 4RY Registered Charity in England and Wales no. 208728 _ This e-mail has been sent in confidence to the named addressee(s). If you are not the intended recipient, you must not disclose or distribute it in any form, and you are asked to contact the sender immediately. Views or opinions expressed in this communication may not be those of The Zoological Society of London and, therefore, The Zoological Society of London does not accept legal responsibility for the contents of this message. The recipient(s) must be aware that e-mail is not a secure communication medium and that the contents of this mail may have been altered by a third party in transit. If you have any issues regarding this mail please contact: administra...@zsl.org. ___ This message has been scanned for viruses by MailControl, a service from BlackSpider Technologies. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
