Hi Milo,
Thanks for the reply, good news that it should be possible. I understand
there might be performance things we need to take into account, but from
the other hand my idea is probably not that spectacular.
Hope it's possible to iron out the architecture a little and see if I can
get a quick and dirty proof of concept with a small area up and running
first. I'm new and have no clue on the amount of work involved and what to
expect at all ;-).
I've commented in-line.
Cheers,
Kim
On Wed, Jan 28, 2015 at 5:39 PM, Milo van der Linden <[email protected]>
wrote:
> Hello Kim,
>
> That is some project you have there!
>
> First of all, everything is possible with geoserver and geowebcache.
> It all depends on the size and scale of your project:
>
> - How many users will you be serving?
> - How big a geographic area will you provide?
>
> A single machine easily becomes overloaded, don't expect lightning
> fast performance..
>
Basically what I have is that I like to have several 'systems' in the field
with limited connectivity (intermittent connection, high latency and low
bandwidth) that need access to map data for reference/information, not
business critical stuff. The coverage that I need is worldwide and
performance is the main reason I'm looking for a decent solution. Each
system ideally stores around 150GB of 'fixed' aerial tiles to a reasonable
zoom level, has a complete OSM database and maybe/optionally a temporary
and small cache of Bing tiles that fills up the gap between the 150GB
dataset and the close-up zoom levels.
The load on the GeoServer is quite limited I think, in most cases it would
only the local user to the machine that requests data. There is a scenario
where up to 25 users per system may request tiles, but this will never
happen concurrently and each of the users will just have a normal profile
of someone playing with a map on an iPad.
My best guess is that this should still be feasible even with a simple Core
i3 and 8GB of RAM?
>
> 2015-01-28 17:14 GMT+01:00 Kim Jansen <[email protected]>:
> > Maybe I needed to add a little more info what I'd like to set up before
> > someone can help and think along.
> >
> > I'll be using OpenLayers and CesiumJS to present the maps/layers.
> >
> > 1.) My basemap needs to be a normal OpenStreetMap map, only with a
> different
> > style than standard
> > - Should be possible to import using osm2pgsql, maybe better solutions
> > available?
>
> You can choose between a variety of importers; imposm and osm2pgsql
> are solutions that shouldn't take to much time to set up. What
> triggers me is "a different style than standard". As a cartographer, I
> know that can be a huge time consumer. I have done a lot of SLD
> styling myself and can tell you from experience, it keeps you
> occupied. Are you really sure that is what you want to do yourself? Or
> would getting an account at mapbox, cartodb or maybe
> http://www.thunderforest.com/ solve your problems?
>
I First want to get things running with the standard styles, and later on
work with a cartographer (or existing stylesheet) to see if we can make it
a little more visually attractive. All the available providers of nicely
styled maps, or those that provide tools to 'easily' customise a map seem
to be relying on an active internet connection for their service. And
that's just what's not very available to me.
>
> > - Plan to use PostgreSQL database on Windows 8.1 64b with PostGIS
> > (- the 'basemap' may be delivered via a small cache managed by
> GeoWebCache)
>
> Shouldn't be a problem, but depends on the geographical size of your
> interest area.
>
I'm guessing I will be looking at 250-300GB of database size with OSM data
given I need worldwide coverage. But again, my feeling is this is large is
size, but the load will be relatively low.
>
> >
> > 2.) As overlay I need to cache the aerial tiles from the remote tile
> server
> > - This is a normal overlay, tiles just build up on top of the base layer
> > when they arrive
> > - Should I run this from the same GeoServer instance, or would it be
> better
> > to use a separate one or even use MapProxy (got the latter working
> already)
>
> Again, this depends on the size of your project.
>
> >
> > 3.) Another layer needs to be 'hybrid', the aerial tiles (2) need to get
> the
> > roads+names from the basemap
> > - I Should be able to use the mentioned hybrid OSM stylesheet to have
> labels
> > and roads/borders as transparent overlay
> > - The labels/etc. should only be visible on top of the aerial tiles, in
> case
> > the basemap is still visible for a specific tile, first that tile needs
> to
> > have become an aerial tile first
> > - Alternatively it may be better to combine aerial and OSM transparant
> tiles
> > on the fly, not sure if this is possible in GeoServer though.
> >
> > Hope a light can be shed whether this setup is possible, what I should
> avoid
> > to do, or whether there are alternative solutions to my idea.
> >
> >
> > On Wed, Jan 21, 2015 at 5:31 PM, Kim Jansen <[email protected]> wrote:
> >>
> >> Hi all,
> >>
> >> I'm new to GeoServer and have been trying to get some caching running
> with
> >> GeoWebCache, the demos worked out well but I'm a bit lost whether and
> how I
> >> can get my idea to work in the best way.
> >>
> >> What I like to achieve is the following:
> >>
> >> 1.) Have a basemap with aerial pictures
> >> 2.) Have a layer with OSM roads, borders and names (all else
> transparent)
> >>
> >> I Will be requesting the data from OpenLayers and CesiumJS.
> >>
> >> ---
> >>
> >> The (layer acting as) basemap is available at a remote server and for
> >> performance reasons it would be great to cache the data temporarily at
> the
> >> local client (Windows 8.1 64b). Except from the URL it responds
> identical to
> >> the well known scheme used by Google Maps (example:
> >> http://mt.google.com/vt/lyrs=s&x=4&y=5&z=4 , only with a different URL
> >> before the first & of course ;-) ). Also same projection.
> >>
> >> I Plan to use the osm-hybrid-carto style sheet
> >> (https://github.com/andrewharvey/osm-hybrid-carto/). See for an example
> >> http://tianjara.net/map#12/-33.9844/151.1798 (select an Imagery and
> the OSM
> >> Hybrid layer).
> >>
> >> ---
> >>
> >> The idea is to load OSM data into a database and let GeoServer serve it
> >> out using two style sheets:
> >>
> >> a.) osm-hybrid-carto - when the remote server is available, such the OSM
> >> data provides a transparent overlay of roads/names
> >> b.) normal - when the remote server is not available, such that the OSM
> >> data provides a normal chart/map
> >>
> >> Next to that I would like to have the GeoWebCache functionality cache
> the
> >> following:
> >>
> >> a.) temporal aerial tiles from remote server - to limit load on the
> remote
> >> server and internet connection
> >> b.) transparent OSM roads/borders overlay from local server
> >> c.) full OSM map tiles from local server
> >>
> >> OpenLayers and CesiumJS should just be able to load any of the discussed
> >> as layers and switch between them on the fly, but that's the easiest
> bit...
> >>
> >> ---
> >>
> >> My questions:
> >>
> >> 1.) Is my idea feasible with a single GeoServer instance
> >> 2.) How do I set up GeoWebCache to listen to requests from a client and
> >> fetch the aerial tiles from the TMS server
> >> 3.) How do I set up GWC to cache the OSM transparent and 'full' tiles at
> >> the same time, while also delivering the aerial tiles
> >> 4.) Whether I'm missing something essential
> >>
> >> Hope someone can give me some help into the right direction :-).
> >>
> >> Cheers,
> >>
> >> Kim
> >
> >
> >
> >
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>
>
>
> --
> Milo van der Linden
> dogodigi
> t: +31-6-16598808
>
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