OSGeo - User contributions [en]

Nederlands

2011-10-07T21:14:26Z

Wiki-Pauldendulk: /* Nederlandstalige OSGeo leden */

= Nederlandstalig OSGeo chapter =

Tijdens de FOSS4G 2011 conferentie in Denver is het idee ontstaan om het Dutch local chapter nieuw leven in te blazen. Een local chapter kan worden opgezet in de vorm van een vereniging maar het kan ook een meer informeel karakter hebben waarin een groep vrijwilligers activiteiten organiseren. De bedoeling is om op het [http://www.geo-info.nl/gin-congres GIN-congres] (30 november en 1 december 2011) te polsen of er onder de GIS-gebruikers en -ontwikkelaars in Nederland behoefte is aan een actieve lokale afdeling van OSGeo.

Ben je geïnteresseerd en wil je op de hoogte blijven, abonneer je dan op de [http://lists.osgeo.org/mailman/listinfo/dutch Nederlandstalige mailinglijst]. Wil je een meer actieve rol spelen, maak dan een [http://wiki.osgeo.org/index.php?title=Special:Userlogin&type=signup&returnto=Main_Page wiki-account] aan en voeg je naam toe aan het overzicht van Nederlandstalige OSGeo leden.

=Doelstelling=
Het doel van het Nederlandstalig OSGeo chapter is om het gebruik van open source GIS-software in het algemeen - en de OSGeo projecten in het bijzonder - in het Nederlandse taalgebied te stimuleren en te promoten. 
Dit doen we door:
* het promoten van OSGeo tijdens evenementen, symposia, enzovoorts.
* het creëren van mogelijkheden voor de leden om te netwerken en informatie uit te wisselen.
* het stimuleren van het gebruik van open source GIS software aan universiteiten, hogescholen en andere onderwijsinstellingen.
* het stimuleren van het gebruik van open source GIS software bij overheidsinstellingen.
* het ondersteunen van open standaarden en de toegang tot open data in Nederland en nederlandstalige landen en gebieden.
* het vergroten van de toegankelijkheid door het ondersteunen en uitvoeren van de vertaling van belangrijke OSGeo onderdelen.

=Aanpak=
Het werven van leden en het inventariseren van de behoefte van (aspirant) leden heeft de hoogste prioriteit. 
Hoe pakken we dit aan? 
* Maak gebruik van de wiki en de mailinglijst: zorg ervoor dat de wiki up-to-date is en dat er regelmatig nieuwsberichten worden verspreid via de mailinglijst.
* Probeer via het netwerk van de reeds bestaande leden en sociale media als Twitter en LinkedIn geïnteresseerden te bereiken.
* Geef een presentatie en verspreid promotiemateriaal tijdens evenementen, zoals het [http://www.geo-info.nl/gin-congres GIN-congres], het Open Innovatie Festival (28 nov. t/m 2 dec. 2011) of [http://www.hackdeoverheid.nl Hack de Overheid]
* Zoek de samenwerking met organisaties en platformen als [http://www.noiv.nl Nederland Open in Verbinding (NOiV)]
 
Bij voldoende belangstellingen organiseren we in 2012 een OSGeo bijeenkomst met presentaties, workshops en een borrel. 

=Middelen=
We hebben promotiemateriaal nodig, bijvoorbeeld:
* leaflet,
* kaartjes,
* t-shirts.
Idee: [[Willy Bakker]] kan vragen of de leaflets en/of kaartjes gedrukt kunnen worden door het Reprocentrum van de provincie.

= Mailinglijst =
Discussies vinden plaats via de Nederlandse mailinglijst van OSGeo.
Je kunt je aanmelden voor deze lijst via http://lists.osgeo.org/mailman/listinfo/dutch. Je kunt ook het [http://lists.osgeo.org/pipermail/dutch/ archief] bekijken.

= Nederlandstalige OSGeo leden =
* [[User:Kobben | Barend Köbben]]
* [[User:bartvde | Bart van den Eijnden]]
* [[User:dirkf | Dirk Frigne]]
* [[Edward_Mac_Gillavry | Edward Mac Gillavry ]]
* [[User:Taatuut | Emil Zegers]]
* [[User:Dullaartegc| Eric Dullaart]]
* [[User:heikki| Heikki Doeleman]]
* [[User:ticheler | Jeroen Ticheler]]
* [[Joris van der Horst]]
* [[User:Just | Just van den Broecke]]
* [[User:Marco Duiker | Marco Duiker]]
* [[user:mprins | Mark Prins]]
* [[User:milovanderlinden | Milo van der Linden]]
* [[Raymond_Nijssen| Raymond Nijssen]]
* [[User:Rr.debruin| Richard de Bruin]]
* [[Richard_Duivenvoorde| Richard Duivenvoorde]]
* [[Ron Wardenier| Ron Wardenier]]
* [[User:roybraam| Roy Braam]]
* [[User:Stvn | Steven Ottens]]
* [[Thijs van Menen]]
* [[User:Friesewoudloper| Willy Bakker]]
* [[User:WimDeHaas | Wim de Haas]]
* [[User:pauldendulk | Paul den Dulk]]

= Naamgeving en logo =

Naar aanleiding van een tweet van [[Thijs van Menen]] met de vraag hoe het Nederlandstalige local chapter zou moeten heten, is de naam '''OSGEO4NL''' geopperd. Via de mailinglijst is '''OSGEO.NL''' voorgesteld. Andere suggesties zijn welkom. 
We zijn ook op zoek naar een leuk en herkenbaar logo. Enkele voorstellen die al via de mailinglijst zijn geopperd:

[[File:osgeonl_logo1.jpg]] [[Thijs van Menen]] 
[[File:osgeonl_logo2.png]] 1 van [[Jeroen Ticheler]] 
[[File:osgeonl_logo3.png]] 2 van [[Jeroen Ticheler]] 
[[File:osgeonl_logo4.png]] [[User:Stvn | Steven Ottens]] 

= Links =
Open source geo-software: 
* Map Servers (WMS/WFS/tiling)
** [http://www.geoserver.org GeoServer]
** [http://www.mapnik.org Mapnik]
** [http://www.mapserver.org MapServer]
** [http://www.deegree.org deegree]
** [http://geowebcache.org GeoWebCache] GeoWebCache tiling server
** [http://mapproxy.org MapProxy] MapProxy

* Metadata
** [http://www.geonetwork-opensource.org GeoNetwork opensource] geospatial metadata catalog

* Desktop GIS
** [http://www.mapwindow.org/ MapWindow]
** [http://www.qgis.org/ Quantum GIS Project]
** [http://udig.refractions.net User-friendly Desktop Internet GIS]
** [http://www.gvsig.org gvSIG]

* Geodatabase
** [http://postgis.refractions.net PostGIS]

* Web Map Viewers
** [http://www.openlayers.org OpenLayers]
** [http://www.flamingo-mc.org Flamingo MC (NL)]
** [http://heron-mc.org Heron MC (NL)]

* Live DVD met OSGeo software
** [http://live.osgeo.org/en/index.html OSGeo Live - Bootable DVD, USB stick of virtuele machine met OSGeo software]

* INSPIRE
** [http://inspire-foss.org FOSS Componenten voor INSPIRE]

* Diversen
** [http://www.opensourcegis.nl www.opensourcegis.nl]

 
Open standaarden: 
* [http://www.geonovum.nl Geonovum]
* [http://www.noiv.nl Nederland Open in Verbinding (NOiV)]
 
Open data: 
* [http://www.openstreetmap.nl OpenStreetMap Nederland]
* [http://www.hackdeoverheid.nl Hack de Overheid]
* [http://data.overheid.nl/ Open data Overheid.nl]
* [http://www.nationaalgeoregister.nl Nationaal Georegister]
* [http://www.provinciaalgeoregister.nl Provinciaal Georegister]
* [http://geoportaal.drenthe.nl Geoportaal Drenthe]
 
Onderzoek & Onderwijs: 
* [http://www.geoictopleidingen.nl Geo-ICT Opleidingen]

 
Commerciële ondersteuning voor open source GIS-software: 
* [http://www.bontepaarden.nl/ Bontepaarden]
* [http://www.opengeogroep.nl OpenGeoGroep] is een coöperatie van:
** [http://www.aris.nl ARIS]
** [http://www.b3partners.nl B3Partners]
** [http://www.brentjensgeoict.nl/ Brentjens Geo-ICT]
** [http://www.dogodigi.net/ Dogodigi]
** [http://www.fast-fox.nl/ FastFox ICT Solutions]
** [http://www.gisarts.nl/ GISArts]
** [http://geocat.net GeoCat] voor GeoNetwork, OpenGeo Suite en GeoCat Bridge
** [http://www.geoforza.nl/ Geoforza]
** [http://www.geoinfobalans.nl/ GeoInfoBalans]
** [http://www.justobjects.nl Just Objects] voor Heron MC, INSPIRE FOSS, GeoServer, Tiling, PostGIS, GeoTracing
** [http://www.md-kwadraat.nl/ MD-Kwadraat]
** [http://www.terglobo.nl/ Terglobo]
** [http://www.webmapper.net Webmapper] voor Quantum GIS, OpenLayers, GeoServer, MapServer, Mapnik en PostGIS
*[http://www.osgis.nl OSGIS] voor OpenLayers, GXP, GeoExt

[[Category:Local Chapters]] [[Category:Nederland]] [[Category:European Network]]

FOSS4G 2010 Breakout Sessions

2010-09-08T15:47:59Z

Wiki-Pauldendulk: /* Tiling meeting */

[[Category:FOSS4G]]
[[Category:FOSS4G2010]]

back to [[FOSS4G 2010]]

= Introduction =
During the [http://2010.foss4g.org/ FOSS4G2010 conference] in Barcelona, Spain, there will be conference rooms available for people to hold Breakout Sessions (aka Birds-of-a-Feather).

Breakout Sessions sessions are unstructured timeslots where people can self-organise themselves to discuss topics of interest.

This year, Breakout Sessions sessions will be held on Wednesday 8th September ('''and possibly at other times as well - depending on interest'''). A number of rooms will be available. Most popular sessions will get bigger rooms.

'''Room allocation to be determined'''

==Organising Contact==
* [[Tyler Mitchell]]
* [[Mauricio Miranda]]
* Other volunteers welcome - sign up here!

==Timeslots Available==

At this stage, each room is scheduled for one hour between 18:00 to 19:00.

Remember the Gala Dinner is scheduled at 20:00.

=Room Assignments=
== Rooms Available ==

We will need to share the biggest rooms because we have more sessions than rooms.

Add your name to the "Moderator" column if you feel as a session's leader.

Please, contact us to ask for changes.

{| class="wikitable" border="1"
|-
! width="120" | Room
! width="250" | Tuesday 07
! width="250" | Wednesday 08
! width="300" | Moderator
|-
| Room 3
|
*Flex Mapping (Alternatives to HTML)
|
|
Sébastien Deleuze
|-
| Room 4 (75 pax)
|
|
*QGIS user & developer meeting
*Tiling meeting
|
|-
| Room 5 (250 pax)
|
|
*Spatial Data Infrastructure
*Virtualization and Cloud Computing BoF
*Java GeoSpatial

|
|-
| Room 6 (320 pax)
|
|
*Sensor Web BoF
*Biodiversity/conservation projects and FOSS4G tools
*Spatial OLAP

|
*Simon Jirka
*Javier de la Torre 
*-

|-
| Room 8 (100 pax)
|
|
*Web Client (OpenLayers/GeoExt)

|
|-
| Room 11 (78 pax)
|
|
*WPS BoF

|
*Bastian Schäffer
|-
| Room 12 (90 pax)
|
|
*Spatial Databases BoF

|
|}

= Proposed Topics =

* Add yours below...

==Web Client (OpenLayers/GeoExt)==

The first half of this session will be focused on OpenLayers, and the second half will focus on GeoExt. We can decide on topics at the start of each session, but we'll likely cover ideas for OpenLayers 3.0/GeoExt 1.0, getting more developers involved, and just some general Q/A time.

'''Coming:'''

* Tim Schaub
* Eric Lemoine
* Frédéric Junod
* David Jonglez - for the first half, at least
* Florin Iosub
* Xurxo Méndez
* [[Ricardo Pinho|Ricardo Pinho]] (depending on the schedule)
* [[Nuno Guerreiro|Nuno Guerreiro]]
* Hugo Pereira
* [[Just van den Broecke|Just van den Broecke]]
* Simon Lopez
* Richard Greenwood
* Andreas Hocevar
* Volker Grabsch
* Matthias Pohl
* Kris Geusebroek - for the first (OpenLayers) half at least
* Jeroen van Wilgenburg
* Edwin Commandeur
* Cédric Moullet
* Julien-Samuel Lacroix
* Pierre Giraud
* Add your name here

==Spatial Databases BoF==

Relational and non-relational persistence layers, let's get together and talk about interoperability, appropriate use cases, architecture and where we should be moving the spatial persistence state-of-the-art!

'''Coming:'''

* Paul Ramsey (PostGIS)
* Nicklas Avén (PostGIS)
* Brent Wood (NIWA)
* Peter Baumann (Jacobs University / rasdaman)
* Vincent Picavet (Oslandia/PostGIS)
* [[Nuno Guerreiro|Nuno Guerreiro]]
* Olivier Courtin (PostGIS)
* Hugo Pereira
* Volker Mische (CouchDB/GeoCouch)
* [[user:sebastian.ovide|Sebastián Ovide]]
* [[user:hal_sk | Haruyuki Seki]]
* [[user:aross | Andrew Ross]] (Ingres)
* Alex Trofast (Ingres)
* Paolo Corti
* Add your name here

==WPS BoF==

Several presentation on Web Processing selected
for presentation at FOSS4G2010 indicates a growing
interest amongst the communities.

If you are interested please add your names below...

'''Who's coming:'''

* Venkatesh Raghavan
* [[Markus Neteler]]
* [[Daniel Kastl]]
* Maria Brovelli
* [[Ian Turton]]
* [[Gerald Fenoy]]
* Nicolas Bozon
* [[Jody Garnett]]
* [[User:fpenarru | Fran Peñarrubia]]
* [[User:MarkusSchneider | Markus Schneider]]
* Luca Delucchi
* Milan Antonovic
* [[User:Maxi71 | Massimiliano cannata]]
* Luca Casagrande
* [[User:Rajsingh| Raj Singh ]]
* [[User:Jesus|Jorge de Jesus]] (Plymouth Marine Laboratory)
* Bertrand Gervais
* [[User:Schpidi | Stephan Meissl]]
* [[Sebastián Cruz|Sebastián Cruz]]
* Fernando González
* Víctor González
* Bastian Schäffer
* Add your name here

==Sensor Web BoF==

The use of Sensor Web implementations has constantly increased during the last years.

If you are interested please add your names below...

'''Who's coming:'''

* Simon Jirka
* Marjorie Robert
* [[User:Maxi71 | Massimiliano cannata]]
* Graeme Mcferren
* Sarawut Ninsawat
* Brent Wood (NIWA)
* Jorge Piera
* Alain Tamayo
* Maria Brovelli
* Add your name here

==Biodiversity/conservation projects and FOSS4G tools==

More and more Open Source is catching on Biodiversity and conservation projects. Most of them are publicly funded so most of the time all the source they develop is Open Source. Aditionally Biodiversity and conservation heavily rely on GIS and they have specific needs. From geospatial niche modeling to species distributions, occurrence catalog, etc, there is a lot to talk about!

If you are interested please add your names below...

'''Coming:'''

* Javier de la Torre (Vizzuality)
* Brent Wood (NIWA)
* [[Markus Neteler]]
* [[User:jesus| Jorge de Jesus]] (Plymouth Marine Laboratory)
* [[User:Aghisla|Anne Ghisla]]
* Andrew W Hill (University of Colorado, Boulder)
* Add your name here

==Spatial Data Infrastructure==

A birds of a feather session about using open source for spatial data infrastructure. Come discuss implementation strategies, best practices, INSPIRE.

'''Who's coming:'''

* Sebastian Benthall (GeoNode)
* David Winslow (GeoNode)
* Ariel Núñez (GeoNode)
* David Jonglez
* [[Ricardo Pinho|Ricardo Pinho]] (depending on the schedule)
* Hugo Pereira
* Maria Brovelli
* [[Sebastián Cruz|Sebastián Cruz]]
* [[user:sebastian.ovide|Sebastián Ovide]]
* Sébastien Deleuze
* Add your name here

==Virtualization and Cloud Computing BoF==

Virtualization and Cloud Computing is growing fast on the GIS world, let's get together and talk about the use cases and share opinions and suggestions about how can we take the most out of this new technology!

If you are interested please add your name below...

'''Coming:'''
* [[Ricardo Pinho|Ricardo Pinho]]
* Hugo Pereira
* [[Sebastián Cruz|Sebastián Cruz]]
* [[user:sebastian.ovide|Sebastián Ovide]]
* Cédric Moullet
* Add your name here

==Spatial OLAP==

Spatial OLAP can be defined as a visual platform built especially to support rapid and easy spatiotemporal analysis and exploration of data following a multidimensional approach comprised of aggregation levels available in cartographic displays as well as in tabular and diagram displays. Let's talk about new improvements combining GIS and BI technologies.

If you are interested please add your name below...

'''Coming:'''
* [[Nuno Guerreiro|Nuno Guerreiro]]
* [[User:Rajsingh| Raj Singh ]]
* Add your name here

==Flex Mapping (Alternatives to HTML)==

Flex is a highly productive, free, open source framework for building expressive web applications that deploy consistently on all major browsers, desktops, and operating systems.
OpenScales is an open source (LGPL) mapping framework written in ActionScript 3 and Flex that allows developers to building Rich Internet Mapping Applications.
There are alternatives to HTML mapping, let's discuss about them...

If you are interested please add your name below...

'''Coming:'''
* Sébastien Deleuze (OpenScales)
* Simon Lopez (OpenScales)
* Fabio Panettieri
* Marjorie Robert (if the session is planned on tuesday)
* [[Ricardo Pinho|Ricardo Pinho]] (depending on the schedule)
* David Jonglez (depending on the schedule)
* Javier de la Torre - Vizzuality (depending on the schedule)
* Add your name here

This session is scheduled tuesday in Room3 at 18:00

==QGIS user & developer meeting==

Topics:
* What's new in QGIS 1.5
* Interesting plugins
* What's coming in the next QGIS release
* Discussion

If you are interested please add your name below...

'''Coming:'''
* Marco Hugentobler
* [[User:Pirmin_Kalberer| Pirmin Kalberer]]
* Mathias Walker
* [[User:Vasile| Vasile Crăciunescu]]
* [[User:Lmotta| Luiz Motta]]
* Richard Duivenvoorde
* [[User:hdus | Horst Düster]]
* [[User:yoichi | Yoichi Kayama]]
* Nobusuke Iwasaki
* [[Milena Nowotarska | Milena Nowotarska]]
* [[User:antonys | Antony Scott]]
* Add your name here

== Java GeoSpatial (GeoTools, GeoServer, uDig, etc...) ==

Topics:

If you are a user or developer in the "Java Tribe" come check out this BOF. You can let the developers know what you like, what you don't like, and what sorts of features and developments you would like to see in the future.

'''Coming:'''

* [[User:jdeolive | Justin Deoliveira]]
* [[User:cholmes | Chris Holmes]]
* Add your name here

==Tiling meeting==

At the moment we're planning to use the back half of room 4, but may move depending on size. Just follow Chris Schmidt.

Topics:
* current state of tiling implementations
* future of our implementations

'''Coming:'''

* [[User:stvn | Steven Ottens]]
* [[User:pauldendulk | Paul den Dulk]]

User talk:Pauldendulk

2007-08-28T09:25:25Z

Wiki-Pauldendulk:

Hi, I am a developer at Geodan [http://www.geodan.com]

User:Pauldendulk

2007-08-28T09:19:52Z

Wiki-Pauldendulk:

Paul den Dulk, Developer at Geodan [http://www.geodan.com]

User talk:Pauldendulk

2007-08-28T09:13:20Z

Wiki-Pauldendulk:

Hi, I am a developer at Geodan [www.geodan.com]

WMS Tile Caching

2007-08-28T09:07:55Z

Wiki-Pauldendulk: /* Interested Parties */

== Goal ==

The goal of a '''WMS Tile Caching''' proposal, perhaps ''WMS-C'' for short, is to find a way to optimize the delivery of map imagery across the Internet. The proposal needs to offer ideally some means by which map clients can fetch tiles from existing servers, in such a way that the images can be cached on the server, or at an intermediate location, or even be completely pre-generated, if desired. Further, the proposal needs to offer a way of advertising that a cached tile set is available for a given layer from a particular WMS or WMS proxy. The proposal should leverage the existing investment in OGC-compliant WMS servers on the 'Net.

The two main questions to be addressed are:
# How does a server advertise its cacheable image tiles?
# How does a client request possibly cached image tiles?

== Proposal ==

=== WMS-C as WMS Profile ===

One approach to take might be to define ''WMS-C'' (as in ''Web Mapping Service - Cached'') as a constrained profile of [http://www.opengeospatial.org/docs/01-068r2.pdf OGC WMS] that permits servers to optimize their image generation, and allows tiles to be cached at intermediate points. A WMS-C service would likely only deliver images for bounding boxes aligned to a given rectangular origin and grid, and only at particular scale levels.

The basic idea is that, unlike with WMS, two different requests for a given WMS-C tile should form the exact same HTTP GET request. This invites several constraints on WMS ''GetMap'' requests:

# Minimal query string arguments (i.e. no optional arguments permitted, versus §7.2)
# Fixed query string argument ordering and case (versus §6.4.1; q.v. also §7.2.2, Table 8)
# Fixed range of possible bounding boxes, computed from the WMS-C profile parameters
# Fixed precision on bounding box values (clarifying §6.5.6)
# Fixed tile size in pixels
# Fixed layer name and/or layer name ordering
# Fixed styling
# Fixed output format

Some means of identifying these constraints programmatically on a per-server basis, a la ''GetCapabilities'' might be desirable. From the table below, it appears that minimum/maximum scale (and scale quantization factor, which should probably never be other than 2) are the only suggested tiling regime parameters that would be difficult to directly express in a WMS GetCapabilities document. Is there some existing way to add custom parameters to a GetCapabilities declaration?

Note that the ''LAYERS'', ''STYLES'', ''SRS'', ''HEIGHT'', ''WIDTH'', and ''FORMAT'' arguments to a ''GetMap'' request would become fixed for a particular WMS-C tiled layer, but the WMS specification would still require the inclusion of these arguments in every WMS-C request (§ 7.2).

A WMS-C proxy or server should be free to return an exception or a redirect, if it receives a WMS request that is not WMS-C compliant, or involves a bounding box that does not correspond to a single tile in the cache.

=== Calculating Valid Tile Extents for a Given Request ===

WMS tile caching implies fixed scale or zoom levels. Typically, each valid scale level would be half that of the next larger scale. It would be worth writing reference code to help developers figure out which tiles they need to load to cover a given bounding box at a given scale.

=== Possible Tile Scheme Parameters ===

{| cellpadding="5" cellspacing="1" border="1"
| '''Parameter''' || '''Default value''' || '''Specifiable in WMS GetCapabilities?'''
|-
| "This service suppports tiling." || ''none'' || ''<KeywordList>'' contains the string 'tiled', perhaps? (§7.1.4.5.3)
|-
| Projection || EPSG:4326 || ''<SRS>''
|-
| Maximal extent || (-180,-90,180,90) || ''<BoundingBox>'' (§7.1.4.5.7)
|-
| Number of horizontal and vertical tiles at the maximal extent || ''none'' || Could be implied by ''<ScaleHint>'' (§7.1.4.5.8, but note that the format is weakly specified)... Alternately, could use ''<DataURL>'' (§7.1.4.5.14)
|-
| Tile size in pixels || some power of 2 || <Layer> attribute ''fixedWidth'', ''fixedHeight'' (§7.1.4.6)
|-
| Minimum scale || ''none'' || ''<ScaleHint>'' or ''<DataURL>'' (see note, above)
|-
| Scale quantization factor || 2 || ''<DataURL>''
|}

----

== Other Considerations ==

* Would non-rectangular tessellations yield more efficient results? If so, which tessellations to consider? Also, are the processing and bandwidth advantages of a non-rectangular tessellation outweighed by the potential implementation complexity?
* Norm Vine rightly points out that a tile request basically boils (or should boil down to) Layer + Zoom Level + Row + Column. Can we define an even simpler method for requesting tiles from servers in the know? How are those capabilities advertised, if not shoehorned into WMS? Note that WorldWind basically already has a mechanism for this. Their tiling requests basically look like:

http://domain.tld/service?L=0&X=1&Y=2
* Like all caching schemes, WMS-C caches would need to be cognizant of expiration. Easy with using the proper HTTP headers. There is a wide range of freshness/staleness, with OpenStreetMap being highly volatile, and Landsat being pretty stable (until the ice caps melt ;).
* Several people (particularly Paul Spencer and Chris Schmidt) have argued that a separate ''GetTile'' request should be used. This topic probably warrants discussion.

== Distributed Caching ==

* A WMS-C standard would permit tile caching through [http://www.coralcdn.org/ Coral]. However, the World Wind community's experience has been that using Coral to serve tiles results in frustratingly high latency.
* Alternately, one could do (distributed) [[Distributed Tile Caching|peer-to-peer tile caching]] optimized specifically for geographic space, which might still suffer the latency issues associated with P2P networks.

== Existing Tiling Schemes ==

* Mikel Maron's description of [http://lists.eogeo.org/pipermail/tiling/2006-March/000017.html OnEarth's LandSat tiling scheme]
* World Wind's LandSat tiling scheme: [http://www.ceteranet.com/nww-tile-struct.pdf PDF], [http://www.worldwindcentral.com/wiki/Making_Layers wiki]
* World Wind ''QuadTileSet'' [http://rafb.net/paste/results/S3I8Zr92.html sample description], [http://forum.worldwind.arc.nasa.gov/lofiversion/index.php?t2965.html forum discussion], [http://rafb.net/paste/results/z2dQKa54.html sample PHP code] to fetch WW tiles for a given WMS GetMap request
* osgPlanet's C++ code for [http://www.remotesensing.org/cgi-bin/cvsweb.cgi/osgPlanet/src/osgPlanet/osgPlanetGridUtility.cpp?rev=HEAD;content-type=text%2Fx-cvsweb-markup tiling the Earth]
* WorldWind Example code for tiling the Earth (needs Proj.4 and GDAL libraries)[http://download.worldwindcentral.com/dstile-0.2.tar.gz DSTile and Tilepack]
* OnEarth's code for intercepting WW requests and converting into WMS requests and caching them [http://www.twobeds.com/upload/userfiles/adamhill/lucians%20code%20-%20cache_1_1.gz?PHPSESSID=f485cf3fd66cd30ad7a4f814a127d2cb from Lucian Plesa]
* Casey Chestnut explains Microsoft Virtual Earth's tiling scheme + code to experiment with the URL's [http://www.brains-n-brawn.com/veWorldWind/]
* GeoOdyssey's [http://www.geodyssey.com/tileshare/index.html TileShare scheme]
* Chuck Stein's [http://www.geongrid.org/workshops/geonvis2005/Presentations/ChuckStein/GeoFusion.ppt GeoFusion presentation] from GEON (warning: PowerPoint)
* [http://globe.sintef.no/documentation/projection.html The Finite Nearly-Conformal Normal Cylindrical Projection] (Aasgaard's map projection)

Note: WW and OnEarth's schemes are pretty much identical, the WW client just allows you to specify arbitrary tile sizes, coverages and number of levels to accomodate a given client.

== Related Projects ==

* [http://www.ossim.org/osgPlanet.html osgPlanet]
* [http://worldwind.arc.nasa.gov/ NASA WorldWind] ([http://www.worldwindcentral.com/wiki/Main_page wiki])
* [http://worldkit.org/ worldKit]
* [http://communitymapbuilder.org/ Community MapBuilder]
* [http://ka-map.maptools.org/ ka-Map!]
* [http://openlayers.org/ OpenLayers]
* other AJAX map clients, presumably

== Interested Parties ==

''Note:'' Interested parties should join the existing low-volume [http://lists.eogeo.org/mailman/listinfo/tiling EOGEO mailing list] dedicated to this topic.

* [[User:SchuylerErle|Schuyler Erle]]
* [[User"Adoyle"|Allan Doyle]]
* [[user"Nhv"|Norman Vine]]
* [[user"Joshli"|Josh Lieberman]]
* [[user"Adamhill"|Adam Hill]]
* [[user"bitner"|David Bitner]]
* [[user:Mikel|Mikel Maron]]
* [[user:mpg|Michael P. Gerlek]]
* [[user:stvn|Steven M. Ottens]]
* [[user:Pagameba|Paul Spencer]]
* [[user:hallkbrdz|Bryan Hall]]
* [[user:tschaub|Tim Schaub]]
* [[user:dmorissette|Daniel Morissette]]
* [[user:dpatton|Dave Patton]]
* [[user:cholmes|Chris Holmes]]
* [[user:pwramsey3|Paul Ramsey]]
* [[user:luisw|Luis W. Sevilla]]
* [[user:ominiverdi|Lorenzo Becchi]]
* [[user:wilfred|Wilfred Springer]]
* [[user:fpurcell|Frank Purcell]]
* [[user:Pauldendulk|Paul den Dulk]]
* ''add yourself''