Re: [gdal-dev] gtiff with internal mask
To solve the overviews I created an external mask file instead, in step 3, by removing the option --config GDAL_TIFF_INTERNAL_MASK YES from the command. As I am using GDAL 1.9.2 I don't know if this issue is caused by the solved issue in 1.10 (https://trac.osgeo.org/gdal/wiki/Release/1.10.0-News): When building overviews, if the image has already an internal mask, then build internal overviews for the mask implicitely I ended up with this set of files: Mosaic.tif Mosaic.tif.msk Mosaic.tif.msk.ovr Mosaic.tif.ovr And to use in qgis, corresponding to step 4: Mosaic_rgba_qgis.vrt Duarte -Mensagem original- De: Duarte Carreira Enviada: quinta-feira, 18 de Julho de 2013 13:01 Para: 'Even Rouault' Cc: 'gdal-dev@lists.osgeo.org' Assunto: RE: [gdal-dev] gtiff with internal mask So... now I 've got issues building the overviews. Gdaladdo loses the transparency so I get to see black areas where I was supposed to see nothing. When I zoom in black disappears. Any known way to overcome this? Thanks, Duarte -Mensagem original- De: Duarte Carreira Enviada: quarta-feira, 17 de Julho de 2013 19:41 Para: 'Even Rouault' Cc: gdal-dev@lists.osgeo.org Assunto: RE: [gdal-dev] gtiff with internal mask Well, you're right... I messed up recreating the footsteps... So, cleaning up: 1) create a rgba vrt using gdalwarp to cut the original mosaic with a shapefile gdalwarp -multi -wm 480 --config GDAL_CACHEMAX 312 -co alpha=yes -dstalpha -cutline shapes\index_diss.shp -of vrt originalmosaic.vrt test_rgba_uncomp.vrt 2) create a masked uncompressed vrt using gdal_translate (because I couldn't compress right away, with errors of missing StripOffsets field) gdal_translate -b 1 -b 2 -b 3 -mask 4 -co alpha=no -co photometric=rgb -co interleave=pixel -co tiled=yes --config GDAL_TIFF_INTERNAL_MASK YES -of vrt test_rgba_uncomp.vrt testmask_uncomp.vrt 3) create final masked compressed tiff using gdal_translate gdal_translate -co alpha=no -co photometric=ycbcr -co interleave=pixel -co tiled=yes -co compress=jpeg --config GDAL_TIFF_INTERNAL_MASK YES testmask_uncomp.vrt test_finalmask.tif The power of VRT amazes me! Also regarding sizes: I still got the same ratio of 8x smaller. To use this in QGIS you still have to create a rgba vrt: 4) gdal_translate -of VRT -b 1 -b 2 -b 3 -b mask test_finalmask.tif test_finalmask_qgis.vrt (couldn't get the 4ª band to be recognized as an alpha band though) So I think now it's correct... I am going to apply this to a real-case mosaic and report back... Duarte -Mensagem original- De: Even Rouault [mailto:even.roua...@mines-paris.org] Enviada: quarta-feira, 17 de Julho de 2013 13:45 Para: Duarte Carreira Cc: gdal-dev@lists.osgeo.org Assunto: Re: [gdal-dev] gtiff with internal mask Le mercredi 17 juillet 2013 14:23:29, Duarte Carreira a écrit : Hi Even. Thanks so much for your tip! It works. I did have to specify I did not want an alpha band when cutting with the shapefile: gdalwarp -multi -wm 480 --config GDAL_CACHEMAX 256 -co photometric=ycbcr -co compress=jpeg -co alpha=no --config GDAL_TIFF_INTERNAL_MASK YES -cutline shapes\index_diss.shp vrtini.vrt testmask.tif Hum, what I don't understand is how the above will produce a mask band in the output file... Does gdalinfo on testmask.tif show something like : Band 1 Block= Type=Byte, ColorInterp=Red Mask Flags: PER_DATASET Band 2 Block= Type=Byte, ColorInterp=Green Mask Flags: PER_DATASET Band 3 Block=... Type=Byte, ColorInterp=Blue Mask Flags: PER_DATASET I think you would need to do the above in 2 steps: 1) gdalwarp to an uncompressed RGBA TIFF 2) gdal_translate to turn the RGBA into a YCbCr JPEG-compressed GTiff + mask band Seems arcgis recognizes the masked tiff, but is much much slower displaying than using a normal alpha band. Perhaps adding -co TILED=YES will help ? (random guess) QGIS does need the vrt trick but then is as fast as usual. Also, the size is must smaller when using an internal mask: from a 219MB rgba,band interleaved,jpegd image to a 27MB ycbcr,pixel interleaved,jpegd masked tiff (8x smaller). Unless I missed something... Not completely surprising although more important than I would have expected. YCbCr compression usually gives a 2x to 3x compression bonus, and due to the usual nature of mask bands, the 1bit deflate compression of the mask band will give better results (both visually and in size) that the 8bit JPEG compression of the alpha band. Thanks again! Duarte -Mensagem original- De: Even Rouault [mailto:even.roua...@mines-paris.org] Enviada: terça-feira, 16 de Julho de 2013 18:58 Para: gdal-dev@lists.osgeo.org Cc: Duarte Carreira Assunto: Re: [gdal-dev] gtiff with internal mask Le mardi 16 juillet 2013 12:29:37, Duarte Carreira a écrit : I'm trying to create gtiffs with transparent areas where there are voids between my original images. I have successfully done it by using an alpha
[gdal-dev] OGRErr OGRLayer::CreateField // cant create fields
Hi guys!
Im having a problem by using the OGRLayter::CreateField method, it isnt
creating the field as the description saids :).
Maybe you can see the error or have an idea to go out of this hole.
Here are the lines of code:
*...*
*...*
* OGRLayer* player = pvector-GetLayer(0);*
* if (player-GetLayerDefn()-GetFieldIndex(SUR_HOTLINK_FIELD) 0) {*
// If the field doesnt exist, I create it.
* OGRFieldDefn field(SUR_HOTLINK_FIELD, OFTString);*
// Try to insert it to the table.
* if ( player-CreateField(field, TRUE) == OGRERR_NONE )*
* SHOW_ERROR(D:Error trying to create field);*
* }*
*...*
*...*
*NOTES:*
the first line returns me without problems the Working Layer ( I just
using just 1 layer to avoid confusions )
the first IF returns that there arent any SUR_HOTLINK_FIELD in the table (
that its OK! )
and de last IF returns that the CreateField gives distinct as OGRERR_NONE.
Thanks in advance!
Mauro Pisano
SUR Emprendimientos Tecnológicos
Perú 345 Piso 5to Oficina B (C1067AAG)
Ciudad de Buenos Aires, Argentina
Tel. +54 (11) 4342-2976/84
mauropis...@suremptec.com.ar
www.suremptec.com
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Re: [gdal-dev] OGRErr OGRLayer::CreateField // cant create fields
Le lundi 22 juillet 2013 22:58:39, Mauro Pisano a écrit :
Hi guys!
Im having a problem by using the OGRLayter::CreateField method, it isnt
creating the field as the description saids :).
Maybe you can see the error or have an idea to go out of this hole.
Here are the lines of code:
*...*
*...*
* OGRLayer* player = pvector-GetLayer(0);*
* if (player-GetLayerDefn()-GetFieldIndex(SUR_HOTLINK_FIELD) 0) {*
// If the field doesnt exist, I create it.
* OGRFieldDefn field(SUR_HOTLINK_FIELD, OFTString);*
// Try to insert it to the table.
* if ( player-CreateField(field, TRUE) == OGRERR_NONE )*
* SHOW_ERROR(D:Error trying to create field);*
* }*
*...*
*...*
*NOTES:*
the first line returns me without problems the Working Layer ( I just
using just 1 layer to avoid confusions )
the first IF returns that there arent any SUR_HOTLINK_FIELD in the table (
that its OK! )
and de last IF returns that the CreateField gives distinct as OGRERR_NONE.
Mauro,
You didn't really give a lot of context. But several possible causes :
- the datasource is not opened in update mode
- the driver does not support field creation at all
Even
--
Geospatial professional services
http://even.rouault.free.fr/services.html
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[gdal-dev] How do I tell if an OGRSpatialReference has been initialized?
Given an OGRSpatialReference class object, how do I tell if it's been initialized to anything? (ie,clear() was called or else was constructed with a null string an no further action was taken to set the SRS?) I've looked over the interface and can't spot anything that tells me it's in a clear state, but of course I might have missed it. Thanks David ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] A new ogr driver
Well, here is my confirmation: As an authorized representative of Walkinfo Technology Co., Ltd., I understand that the submitted code to the GDAL project will be contributed under the MIT/X license. Thanks, Xian Even Rouault wrote Le vendredi 19 juillet 2013 03:31:12, Xian Chen a écrit : Hi all, I'm planning to submit a new driver for accessing Walk files, a geospatial data format developed by Walkinfo Tech. mainly for land surveying, evaluation, planning, checking and data analysis in China. Walkinfo Tech. is a China-based company founded since 1999, origignally focused on land surveying software research and development. Currently we have our own geographic information platform WalkGIS, as well as scores of GIS desktop, mobile products based on it, including WalkISurvey, WalkISurface, WalkCheck, WalkFu and so on. The company is also the largest strategic partner with Esri ArcGIS in China. The WalkGIS applications use GDAL/OGR as part of its base libaries. The purpose of developing the Walk driver on GDAL/OGR is to allow other GIS products such as ArcGIS to access our data more easily and conveniently. The driver I am working on is already able to get the information such as layers, features, geometries, and spatial references from Walk files. Can I get the permission to submit it to GDAL project and share it with other GDAL developers? Hi Xian, First, you should check with your employer that you can legally contribute code to the GDAL/OGR project and submit it under the GDAL MIT/X licence. Check the Legal section of http://trac.osgeo.org/gdal/wiki/rfc3_commiters . If this is the case, send an email to this mailing list where you will confirm it. I also suggest that you read the developer guidelines at http://trac.osgeo.org/gdal/wiki/rfc8_devguide and check that your code conforms to (most of) them. For OGR driver, I would also recommend that you test the driver with the test_ogrsf utility (not compiled by default, but in a custom build, you can cd apps, and then make test_ogrsf / nmake /f makefile.vc test_ogrsf.exe) on sample files in your data format. This will run a few consistency test to check assumptions that an OGR driver should met. Then, you can attach an archive with the code to a Trac ticket ( http://trac.osgeo.org/gdal/newticket ), so that it can be reviewed. Best regards, Even -- Geospatial professional services http://even.rouault.free.fr/services.html ___ gdal-dev mailing list gdal-dev@.osgeo http://lists.osgeo.org/mailman/listinfo/gdal-dev -- View this message in context: http://osgeo-org.1560.x6.nabble.com/gdal-dev-A-new-ogr-driver-tp5067479p5068082.html Sent from the GDAL - Dev mailing list archive at Nabble.com. ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
