[gdal-dev] mosaicking files with partial overlap and binary mask

Thu Feb 11 06:21:35 PST 2021

Thanks for the feedback, Patrick.
I have downloaded the latest build from GisInternals and it worked as
expected.
I have another question.
It looks like warping an input file containing a binary mask isn't
preserving the binary mask on the output.
Should I specify any flag for that?

Thanks for the help.
Regards,
Daniele

On Thu, Jan 28, 2021 at 4:23 PM Patrick Young <
patrick.mckendree.young at gmail.com> wrote:

> I do not!
>
> If you want to try it out without building latest yourself and can use
> docker, you can snag one of the latest containers here and see if it works
> for you:
>
> https://hub.docker.com/r/osgeo/gdal/tags?page=1&ordering=last_updated
>
> Best,
> Patrick
>
> On Thu, Jan 28, 2021 at 2:12 AM Daniele Romagnoli <
> daniele.romagnoli at geo-solutions.it> wrote:
>
>> Hi Patrick,
>> nice!
>> Thanks for the feedback.
>>
>> Do you have any info about eventual backports to previous versions?
>>
>> Regards,
>> Daniele
>>
>> On Thu, Jan 28, 2021 at 12:02 AM Patrick Young <
>> patrick.mckendree.young at gmail.com> wrote:
>>
>>> Hi Daniele,
>>>
>>> Even added this functionality to VRTs just recently, see
>>>
>>> https://lists.osgeo.org/pipermail/gdal-dev/2020-December/053178.html
>>>
>>> I think it is slated for GDAL 3.3 but you could always build the
>>> bleeding edge.
>>>
>>> Patrick
>>>
>>> On Wed, Jan 27, 2021 at 3:50 AM Daniele Romagnoli <
>>> daniele.romagnoli at geo-solutions.it> wrote:
>>>
>>>> Hi list,
>>>> I have some TIFF datasets with partially overlapping edges and embedded
>>>> binary masks to keep into account which parts along the edges should be
>>>> masked out.
>>>> When showing all the images on QGIS it looks good since the binary mask
>>>> do its job by making the "black/white" overlapping edge masked out.
>>>>
>>>> Now I need to create a single TIF from all of these images.
>>>> I have tried with gdalbuildvrt but it doesn't produce good result.
>>>> Checking the doc I saw this:
>>>>
>>>>
>>>> *If there is some amount of spatial overlapping between files [...]
>>>> currently, alpha channel is not taken into account to do alpha compositing
>>>> (so a source with alpha=0 appearing on top of another source will override
>>>> is content). This might be changed in later versions.  *
>>>>
>>>> So I think it's expected and I have switched to gdal_merge.py.
>>>> It works better since it does alpha compositing but it looks like the
>>>> result doesn't preserve the binary mask which I still need since I have M
>>>> groups of N files which I need to process in 2 passes:
>>>> - the inner group of N files get merged using the binary mask to a
>>>> bigger file.
>>>> - all the M bigger files get mosaicked again to a single huge file.
>>>>
>>>> I will spend some more time in testing different attempts.
>>>> In the meantime, do you have any suggestion or past experience on how
>>>> to deal with that?
>>>> Side note: I have vague memory of gdal_merge being somehow memory
>>>> bounded, throwing memory allocation errors when trying to compose big
>>>> images. This is why in the past I was using gdalbuildvrt to do composition
>>>> (without overlapping).
>>>>
>>>> Thanks in advance.
>>>> Regards,
>>>> Daniele
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>> Daniele Romagnoli
>>>> ==
>>>> GeoServer Professional Services from the experts! Visit
>>>> http://goo.gl/it488V for more information.
>>>> ==
>>>>
>>>> Ing. Daniele Romagnoli
>>>> Senior Software Engineer
>>>>
>>>> GeoSolutions S.A.S.
>>>> Via di Montramito 3/A
>>>> 55054  Massarosa (LU)
>>>> Italy
>>>> phone: +39 0584 962313
>>>> fax:      +39 0584 1660272
>>>>
>>>> http://www.geo-solutions.it
>>>> http://twitter.com/geosolutions_it
>>>>
>>>> -------------------------------------------------------
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>>
>> --
>> Regards,
>> Daniele Romagnoli
>> ==
>> GeoServer Professional Services from the experts! Visit
>> http://goo.gl/it488V for more information.
>> ==
>>
>> Ing. Daniele Romagnoli
>> Senior Software Engineer
>>
>> GeoSolutions S.A.S.
>> Via di Montramito 3/A
>> 55054  Massarosa (LU)
>> Italy
>> phone: +39 0584 962313
>> fax:      +39 0584 1660272
>>
>> http://www.geo-solutions.it
>> http://twitter.com/geosolutions_it
>>
>> -------------------------------------------------------
>>
>> Con riferimento alla normativa sul trattamento dei dati personali (Reg.
>> UE 2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si
>> precisa che ogni circostanza inerente alla presente email (il suo
>> contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è
>> riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il
>> messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra
>> operazione è illecita. Le sarei comunque grato se potesse darmene notizia.
>>
>> This email is intended only for the person or entity to which it is
>> addressed and may contain information that is privileged, confidential or
>> otherwise protected from disclosure. We remind that - as provided by
>> European Regulation 2016/679 “GDPR” - copying, dissemination or use of this
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>

-- 
Regards,
Daniele Romagnoli
==
GeoServer Professional Services from the experts! Visit http://goo.gl/it488V
for more information.
==

Ing. Daniele Romagnoli
Senior Software Engineer

GeoSolutions S.A.S.
Via di Montramito 3/A
55054  Massarosa (LU)
Italy
phone: +39 0584 962313
fax:      +39 0584 1660272

http://www.geo-solutions.it
http://twitter.com/geosolutions_it

-------------------------------------------------------

Con riferimento alla normativa sul trattamento dei dati personali (Reg. UE
2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si
precisa che ogni circostanza inerente alla presente email (il suo
contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è
riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il
messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra
operazione è illecita. Le sarei comunque grato se potesse darmene notizia.

This email is intended only for the person or entity to which it is
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e-mail or the information herein by anyone other than the intended
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