[Geoserver-devel] imagemosaic returns blank when more than one granule is in view

Niels_Charlier · March 5, 2018, 11:27am

I'm having the strangest issue with imagemosaic.

I simplified the use case in order to exclude any factors that could possibly be the cause of the issue, but to no avail.

This is what I am left with:

* I create an imagemosaic from a directory with two adjacent GEOTIFF images in it. I let imagemosaic do all the configuration and build the catalog.

* Whenever I zoom into one of the the two granules with a WMS getMap request, they are displayed perfectly.

* Whenever I zoom out to see both granules at once, I get a blank result.

Does this sound like anything that has ever happened before? Is this not supposed to work? I'm not sure where to debug at this moment.

Kind Regards

Niels

Niels_Charlier · March 7, 2018, 4:03pm

In the meantime I have found out that the reason that the images do show when only one is inside the bbox, is simply that imagemosaic skips the mosaicing procedure altogether when there is only one image in the result.

the blank result is produced by the JAI imagemosaic operation itself. it has to have something to do with the colours inside the images. the transparent background is black, and I have tried specifying that in background values and/or transparent input colour, but then I get an "unsupported format" error. An error that has been reported several times on the users ML when specifying these settings, but without resolution.

I have included two sample images, one for the background and one for the foreground. If anyone has any idea what this could be related to or what I could try, thanks in advance.

Kind Regards
Niels

On 05-03-18 12:27, Niels Charlier wrote:

I'm having the strangest issue with imagemosaic.

I simplified the use case in order to exclude any factors that could possibly be the cause of the issue, but to no avail.

This is what I am left with:

* I create an imagemosaic from a directory with two adjacent GEOTIFF images in it. I let imagemosaic do all the configuration and build the catalog.

* Whenever I zoom into one of the the two granules with a WMS getMap request, they are displayed perfectly.

* Whenever I zoom out to see both granules at once, I get a blank result.

Does this sound like anything that has ever happened before? Is this not supposed to work? I'm not sure where to debug at this moment.

Kind Regards

Niels

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(attachments)

sample_bg.tif (78.6 KB)
sample_fg.tif (78.6 KB)

Jason_Newmoyer · March 8, 2018, 3:14pm

I remember running into this before. There were a few different variations of the problem having to do with InputTransparentColor settings. Ultimately what worked for me was creating mask bands in all of my geotiffs and using FootprintBehavior:Transparent, instead of InputTransparentColor (or OutputTransparentColor), both of which are now blank.

···

On Wed, Mar 7, 2018 at 11:03 AM, Niels Charlier <niels@anonymised.com> wrote:

In the meantime I have found out that the reason that the images do show when only one is inside the bbox, is simply that imagemosaic skips the mosaicing procedure altogether when there is only one image in the result.

the blank result is produced by the JAI imagemosaic operation itself. it has to have something to do with the colours inside the images. the transparent background is black, and I have tried specifying that in background values and/or transparent input colour, but then I get an “unsupported format” error. An error that has been reported several times on the users ML when specifying these settings, but without resolution.

I have included two sample images, one for the background and one for the foreground. If anyone has any idea what this could be related to or what I could try, thanks in advance.

Kind Regards
Niels

On 05-03-18 12:27, Niels Charlier wrote:

I’m having the strangest issue with imagemosaic.

I simplified the use case in order to exclude any factors that could possibly be the cause of the issue, but to no avail.

This is what I am left with:

I create an imagemosaic from a directory with two adjacent GEOTIFF images in it. I let imagemosaic do all the configuration and build the catalog.

Whenever I zoom into one of the the two granules with a WMS getMap request, they are displayed perfectly.

Whenever I zoom out to see both granules at once, I get a blank result.

Does this sound like anything that has ever happened before? Is this not supposed to work? I’m not sure where to debug at this moment.

Kind Regards

Niels

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Jason Newmoyer
Newmoyer Geospatial Solutions
843.606.0424
jason@anonymised.com

Niels_Charlier · March 15, 2018, 2:33pm

Thanks for the tip, Jason. I have did

gdal_translate -b mask <name>.tif <name>.tif.msk

on all the images and then set FootprintBehavior:Transparent

but that didn't work

Is that what you meant?

Regards
Niels

On 08-03-18 16:14, Jason Newmoyer wrote:

I remember running into this before. There were a few different variations of the problem having to do with InputTransparentColor settings. Ultimately what worked for me was creating mask bands in all of my geotiffs and using FootprintBehavior:Transparent, instead of InputTransparentColor (or OutputTransparentColor), both of which are now blank.

Jason Newmoyer
Newmoyer Geospatial Solutions
843.606.0424
jason@anonymised.com <mailto:jason@anonymised.com>

On Wed, Mar 7, 2018 at 11:03 AM, Niels Charlier <niels@anonymised.com <mailto:niels@anonymised.com>> wrote:

    In the meantime I have found out that the reason that the images
    do show when only one is inside the bbox, is simply that
    imagemosaic skips the mosaicing procedure altogether when there is
    only one image in the result.

    the blank result is produced by the JAI imagemosaic operation
    itself. it has to have something to do with the colours inside the
    images. the transparent background is black, and I have tried
    specifying that in background values and/or transparent input
    colour, but then I get an "unsupported format" error. An error
    that has been reported several times on the users ML when
    specifying these settings, but without resolution.

    I have included two sample images, one for the background and one
    for the foreground. If anyone has any idea what this could be
    related to or what I could try, thanks in advance.

    Kind Regards
    Niels

    On 05-03-18 12:27, Niels Charlier wrote:

        I'm having the strangest issue with imagemosaic.

        I simplified the use case in order to exclude any factors that
        could possibly be the cause of the issue, but to no avail.

        This is what I am left with:

        * I create an imagemosaic from a directory with two adjacent
        GEOTIFF images in it. I let imagemosaic do all the
        configuration and build the catalog.

        * Whenever I zoom into one of the the two granules with a WMS
        getMap request, they are displayed perfectly.

        * Whenever I zoom out to see both granules at once, I get a
        blank result.

        Does this sound like anything that has ever happened before?
        Is this not supposed to work? I'm not sure where to debug at
        this moment.

        Kind Regards

        Niels

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