[gdal-dev] OSGeo.OGR.Geometry: Union the mutiple geometries at a time

Developers, We came to know that OSGeo.OGR.Geometry is having the *Union *method which allows to the union of the two geometries (code snippet below). But this allows us one by one. How to union the multiple geometries (say 1000 geometries) at a time? Any methods or libraries in GDAL?

Re: [gdal-dev] What is lost when converting 12 bit imagery to 8 bit?

Patrick, FWIW, Rob's post is on the process he uses in Photoshop to prepare images for various venues. For imagery published through the platform we (Planet) do not use per-image white-point and black-point (or we would not have day to day, and scene to scene consistency). We do apply color

Re: [gdal-dev] What is lost when converting 12 bit imagery to 8 bit?

I would guess you usually see 8bit RGB images because that is what your monitor can display. What is lost is a deeper question, per channel you have to squeeze the original [0 - 4095] pixel value range per channel down to [0 -255], and there are lots of ways to do it. The problem is sometimes

[gdal-dev] What is lost when converting 12 bit imagery to 8 bit?

SPOT 6/7 satellite imagery is captured with a dynamic range of 12 bits per pixel per channel (ref). However almost all of the SPOT imagery I have seen in use has been 8 bits per channel, and split into RGB natural colour (Bands-321) and Near-infrared-RG false