Re: [Qlandkartegt-users] Fwd: Scaling (Zoom) of a .vrt dtk 25
Hi Oliver, thank you! I use the gdaladdo command and it works fine now. The slider works now as well, but as you mentionded it blocks a long time! Kind regards Axel Am 06.08.2017 um 11:05 schrieb Oliver Eichler: Hi, if at a zoom level the amount of pixel to read exceeds a threshold QMS skips the map. This is a safety mechanism to catch a map that otherwise would block the map refresh for a long time. As this is highly dependent on CPU power, data bus clock and file format the threshold is quite conservative. There are two ways to bypass: 1) For each map there is a slider with two buttons in the properties to control visibility. This will override the threshold. https://bitbucket.org/maproom/qmapshack/wiki/DocControlMapDem#markdown-header-map-and-dem 2) Add overviews to your map. gdaladdo --config COMPRESS_OVERVIEW LZW -ro your_map.vrt 8 16 64 In the current release version the map has to be single banded (color table), to make it work. With commit 43b0987e30695ced81dfe34f8d82f4ec2ec6036d it works for other maps, too. HTH Oliver Am Sonntag, 6. August 2017, 09:52:14 CEST schrieb AM: > Dear all, > > I created a dtk.vrt from the "Digitale Topographische Karte 1:25.000 > RGB" by using > > gdalbuildvrt -resolution highest dtk25.vrt > /home/user/dtk25rgb_EPSG25832_TIFF/*.tif > > > If I like to zoom out by using the "+"- button on my keyboard I can > only see the map with a scale 1 km. > > If the scale is greater I can only see an empty frame. > > In QGIS I can zoom to all scales. > > > Thank you for your help! > > > Kind regards > > > Axel > > > > -- Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > ___ > Qlandkartegt-users mailing list > Qlandkartegt-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ Qlandkartegt-users mailing list Qlandkartegt-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot___ Qlandkartegt-users mailing list Qlandkartegt-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
Re: [Qlandkartegt-users] Fwd: Scaling (Zoom) of a .vrt dtk 25
Hi, if at a zoom level the amount of pixel to read exceeds a threshold QMS skips the map. This is a safety mechanism to catch a map that otherwise would block the map refresh for a long time. As this is highly dependent on CPU power, data bus clock and file format the threshold is quite conservative. There are two ways to bypass: 1) For each map there is a slider with two buttons in the properties to control visibility. This will override the threshold. https://bitbucket.org/maproom/qmapshack/wiki/ DocControlMapDem#markdown-header-map-and-dem 2) Add overviews to your map. gdaladdo --config COMPRESS_OVERVIEW LZW -ro your_map.vrt 8 16 64 In the current release version the map has to be single banded (color table), to make it work. With commit 43b0987e30695ced81dfe34f8d82f4ec2ec6036d it works for other maps, too. HTH Oliver Am Sonntag, 6. August 2017, 09:52:14 CEST schrieb AM: > Dear all, > > I created a dtk.vrt from the "Digitale Topographische Karte 1:25.000 > RGB" by using > > gdalbuildvrt -resolution highest dtk25.vrt > /home/user/dtk25rgb_EPSG25832_TIFF/*.tif > > > If I like to zoom out by using the "+"- button on my keyboard I can > only see the map with a scale 1 km. > > If the scale is greater I can only see an empty frame. > > In QGIS I can zoom to all scales. > > > Thank you for your help! > > > Kind regards > > > Axel > > > > -- Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > ___ > Qlandkartegt-users mailing list > Qlandkartegt-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot___ Qlandkartegt-users mailing list Qlandkartegt-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
[Qlandkartegt-users] Fwd: Scaling (Zoom) of a .vrt dtk 25
Dear all, I created a dtk.vrt from the "Digitale Topographische Karte 1:25.000 RGB" by using gdalbuildvrt -resolution highest dtk25.vrt /home/user/dtk25rgb_EPSG25832_TIFF/*.tif If I like to zoom out by using the "+"- button on my keyboard I can only see the map with a scale 1 km. If the scale is greater I can only see an empty frame. In QGIS I can zoom to all scales. Thank you for your help! Kind regards Axel -- Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ___ Qlandkartegt-users mailing list Qlandkartegt-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
