<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">So, if the gdal library queries for a region of the vrt (ie processing it in chunks), the numpy array will be just that region? I'll give it a try.<div class=""><br class=""></div><div class="">What about something like viewing the whole vrt in QGIS - will it be read in chunks as well? IOW, is it the GDAL library that breaks it into chunks at reading, or is it the responsibility of programs (gdal_translate, QGIS,...) to ask for chunks?</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Apr 26, 2018, at 12:59 PM, Even Rouault <<a href="mailto:even.rouault@spatialys.com" class="">even.rouault@spatialys.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">On jeudi 26 avril 2018 12:56:10 CEST William Kyngesburye wrote:</div><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">> So, a vrt of a vrt?</div><p style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class=""> </p><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">Yes</div><p style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class=""> </p><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">> </div><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">> I wanted to avoid that, because as I understand the source, it reads each</div><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">> raster in the derived band as a single numpy array, which would be all the</div><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">> tiled rasters together. </div><p style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class=""> </p><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">No, if you use gdal_translate, it will process the source by reasonable chunks, so you should be able to process arbitrarily large sources.</div><p style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class=""> </p><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">Even</div><p style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class=""> </p><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">-- </div><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class="">Spatialys - Geospatial professional services</div><div style="white-space: pre-wrap; font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; margin: 0px;" class=""><a href="http://www.spatialys.com/" class="">http://www.spatialys.com</a></div><span style="font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">_______________________________________________</span><br style="font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">gdal-dev mailing list</span><br style="font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="mailto:gdal-dev@lists.osgeo.org" style="font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">gdal-dev@lists.osgeo.org</a><br style="font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="https://lists.osgeo.org/mailman/listinfo/gdal-dev" style="font-family: 'Sans Serif'; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a></div></blockquote></div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="font-size: 14px; orphans: 2; widows: 2; margin: 0px;" class="">-----</div><div style="font-size: 14px; orphans: 2; widows: 2; margin: 0px;" class="">William Kyngesburye <kyngchaos*at*kyngchaos*dot*com></div><div style="font-size: 14px; orphans: 2; widows: 2; margin: 0px;" class=""><a href="http://www.kyngchaos.com/" class="">http://www.kyngchaos.com/</a></div><div style="font-size: 14px; orphans: 2; widows: 2;" class=""><br class="khtml-block-placeholder"></div><div style="font-size: 14px; orphans: 2; widows: 2; margin: 0px;" class="">"We can die but once, and that once we must die. To be always fearing, then, would not avert it, and would make life miserable."</div><div style="font-size: 14px; orphans: 2; widows: 2; margin: 0px;" class=""><br class="khtml-block-placeholder"></div><span style="font-size: 14px; orphans: 2; widows: 2;" class="">- Tarzan, on death</span></div>
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