Dear David,
this is not the way to go.

What you need is a raster timeseries which you might want to create
using the imagemosaic plugin.
Some pointers:
http://docs.geoserver.org/latest/en/user/tutorials/imagemosaic_timeseries/imagemosaic_timeseries.html
http://geoserver.geo-solutions.it/edu/en/multidim/rest/index.html

Aside, you should probably convert to geotiff before ingesting.

Regards,
Simone Giannecchini
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On Mon, Nov 20, 2017 at 1:09 PM, Shed <s...@manx.net> wrote:
> Hello,
>
>
>
> Geoserver 2.12 on Windows Server 2012
>
>
>
> I am just getting started with GeoServer and I am struggling to find a
> method of updating a png file once it is rendered.
>
>
>
> What I’m doing is retrieving a png of the rainfall radar image from the Met
> Office DataPoint service. If I set-up a worldfile store, with the associated
> pgw file, and create a layer, I can view that image in the preview and in my
> application. Where I fall down is replacing the current image with a new
> one.
>
>
>
> Attempting to overwrite the png file gets me an error that the file is “in
> use by java.exe”.
>
>
>
> Please can anyone point me to a method of uploading a new png file – either
> by ftp, file copy or via the API – to the file system so that my rainfall
> map is kept up-to-date?
>
>
>
> Many thanks
>
>
>
> David
>
>
> ------------------------------------------------------------------------------
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>
> Please make sure you read the following two resources before posting to this
> list:
> - Earning your support instead of buying it, but Ian Turton:
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> - The GeoServer user list posting guidelines:
> http://geoserver.org/comm/userlist-guidelines.html
>
> Geoserver-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geoserver-users
>

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