[Geomoose-users] Download link per layer.

[James Klassen]

Bob,

In general this is a very hard problem (impossible) to solve on the
GeoMoose side.  This is really a question of data organization.

In general, there is a one to many relationship between a GeoMoose catalog
layer and GeoMoose MapSources (a WMS/WFS/other thing OpenLayers can read
service).

There is also a one to (zero or many) relationship between a WMS layer and
data files/tables.  It could be an inline feature, could be a group name
that pulls in many (MapServer) layers, it could be data generated on the
fly (DB View or MapServer GeoProcessing).

If assumptions can be made about how the data is organized on the server or
organized via WMS/WFS layer pairs via MapServer or the source data is
otherwise documented then you could have a service (possibly WFS) generate
a file and send it to the client to download/save.

Brent,

Assuming you are looking to solve this for a particular dataset and not
every possible GeoMoose datasource, I'd look at building a URL that returns
the data as (Geo)JSON (either via a MapServer query/template, WFS
outputformat, or custom script) and feeding that to D3.js to make the chart.
On Apr 26, 2016 11:27 AM, "Brent Fraser" <bfraser at geoanalytic.com> wrote:

> bobb,
>
>   I was just looking into a similar problem.  But the target would be a
> chart (e.g. bar/pie chart) in a browser window.
>
> Best Regards,
> Brent Fraser
>
> On 4/26/2016 9:48 AM, Basques, Bob (CI-StPaul) wrote:
>
> All,
>
> This is an on again, off again wishlist item for me.
>
> Came up again this week here in the office.  I was wondering about adding
> a tool config to the mapbook for setting up a download link for data on a
> particular layer.  I understand that not all data sources are the same, and
> that some might be easier to setup than others, but in general, anyone else
> interested in this type of capability?
>
> I initially thought about trying this with SHP files, of which we have
> about 260 different ones in our install.  Note: some layers are composed of
> more than one SHP file.  While thinking on it some more, another thought
> was to investigate whether some sort of standard output might be washed
> through Mapserver as a generic method of data output.  This would allow for
> a clip and ship approach too vs downloading an entire dataset, it also
> seems like it would help with data originating in Databases.  Maybe this is
> two different tools, or at least download options.  Some of the layers
> could easily be downloaded in their entirety.  Would GeoPackage be a
> possible output format to target for something like this, something else?
>  I’m also interested in any thoughts on how to manage/organize things on
> the backend.  I suspect that we have a good system already, but all ideas
> welcome.
>
> Thanks
>
>
> bobb
>
>
>
>
> “There is nothing quite so useless as doing with great efficiency
> something that should not be done at all.”
>                         - Peter Drucker
>
>
>
>
>
>
>
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