OSGeo - User contributions [en]

INSPIRE

2008-08-23T19:17:25Z

Wiki-Bartvde:

[http://eu-geoportal.jrc.it/ INSPIRE] is a European based approach at solving interoperability issues for gespatial data.

== Introduction (from http://eu-geoportal.jrc.it/) ==

''INSPIRE (Infrastructure for Spatial Information in Europe) is an initiative launched by the European Commission and developed in collaboration with Member States and accession countries. It aims at making available relevant, harmonized and quality geographic information to support formulation, implementation, monitoring and evaluation of Community policies with a territorial dimension or impact. INSPIRE intends to trigger the creation of a European spatial data infrastructure that delivers to the users integrated spatial information services linked by common standards and protocols.''

''The INSPIRE Geo-Portal is Europe's Internet access point for Spatial Data and Services. From there, you can search for spatial data, services, and organisations. ''

== OSGeo's involvement ==
There is no coordinated effort at involving OSGeo as an organization in the INSPIRE initiative but many OSGeo projects are already tied into processes and the emerging INSPIRE architecture. A formal meeting of OSGeo representatives with people (from JRC) involved in INSPIRE is planned for the end of 2007.

== FIT/GAP analysis ==
How good does Open Source GIS software fit into the INSPIRE picture? Can it be used as a software stack to build INSPIRE SDI's? It would be interesting to make a fit/gap analysis between what the INSPIRE standards require and what the OSGEO stack provides. Also, a plan could be made up to fill in the gaps (in time). The reasoning behind this is that the regular customers will not be able to make this analysis by themselves, so it would be good to have something written up. Ofcourse this is an ongoing effort as not many of the standards are final as yet, and most are still in draft.

Who is interested in collaborating in such a fit/gap analysis?
* Bart van den Eijnden

Nederlands

2007-10-18T18:01:18Z

Wiki-Bartvde: /* Geïnteresseerde Personen / Interested Individuals */

= Geïnteresseerde Personen / Interested Individuals =
* [[User:Taatuut | Emil Zegers]]
* [[User:bartvde | Bart van den Eijnden]]

= Links =
[[Category:Local Chapters]]

Tile Map Service Specification

2006-10-23T18:49:28Z

Wiki-Bartvde: /* TileMapService Resource */

==Introduction==

===Document Scope===

This standard specifies the behavior of a service that provides access to georeferenced maps in the form of a regularly spaced set of regularly sized squares at a finite number of scales. This standard specifies operations to retrieve a computer-readable description of the service instance and to retrieve particular tiles.

A Tile Map Service provides access to cartographic maps of geo-referenced data, not direct access to the data itself. This document standardizes the way in which map tiles are requested by clients, and the ways that servers describe their holdings.

===Document Form===

This specification will proceed from a description of general resources provided by the server to particular resources (such as map tiles) providing examples of access URLs and return values at each stage.

==Specification==

The Tiled Web Service provides access to resources, in particular, to rendered cartographic tiles at fixed scales. Access to these resources is provided via a "REST" interface, starting with a root resource describing available layers, then map resources with a set of scales, then scales holding sets of tiles.

===Root Resource===

The root resource describes the available versions of the <TileMapService> (and possibly other services as well).

Request:

http://tms.osgeo.org/

Response:

<?xml version="1.0" encoding="UTF-8" ?>
<Services>
<TileMapService version="1.0.0" href="http://tms.osgeo.org/1.0.0/" />
<TileMapService version="1.1.0" href="http://tms.osgeo.org/1.1.0/" />
<FancyFeatureService version="0.9" href="http://ffs.osgeo.org/0.9/" />
</Services>

===TileMapService Resource===

The <TileMapService> resource provides description metadata about the service and lists the available <TileMaps>. Optional elements in the resource are called out below using the pipe character.

Request:

http://tms.osgeo.org/1.0.0/

Response:

<?xml version="1.0" encoding="UTF-8" ?>
<TileMapService version="1.0.0">
<Title>Example Tile Map Service</Title>
<Abstract>This is a longer description of the example tiling map service.</Abstract>
| <KeywordList>example tile service</KeywordList>
| <ContactInformation>
| <ContactPersonPrimary>
| <ContactPerson>Paul Ramsey</ContactPerson>
| <ContactOrganization>Refractions Research</ContactOrganization>
| </ContactPersonPrimary>
| <ContactPosition>Manager</ContactPosition>
| <ContactAddress>
| <AddressType>postal</AddressType>
| <Address>300 - 1207 Douglas Street</Address>
| <City>Victoria</City>
| <StateOrProvince>British Columbia</StateOrProvince>
| <PostCode>V8W2E7</PostCode>
| <Country>Canada</Country>
| </ContactAddress>
| <ContactVoiceTelephone>12503833022</ContactVoiceTelephone>
| <ContactFacsimileTelephone>12503832140</ContactFacsimileTelephone>
| <ContactElectronicMailAddress>pramsey@refractions.net</ContactElectronicMailAddress>
| </ContactInformation>
<TileMaps>
<TileMap
href="http://tms.osgeo.org/1.0.0/vmap0/"
srs="EPSG:4326"
global-profile="1">
VMAP0 World Map
</TileMap>
<TileMap
href="http://tms.osgeo.org/1.0.0/landsat2000/"
srs="EPSG:3005"
global-profile="0">
British Columbia Landsat Imagery (2000)
</TileMap>
</TileMaps>
</TileMapService>

===TileMap Resource===

A <TileMap> is a (usually) cartographically complete map representation. Sometimes <TileMap>s are built to be used in conjunction, as a set of stacked layers, but they are generally visually complete on their own.

<TileMap>s are composed of a set of scale-appropriate cartographic renderings, each divided up into regularly spaced image tiles, called <TileSet>s. Small-scale (eg, 1:10000000) tile sets may only contain a handful of tiles. Large-scale tile sets (eg, 1:10000) may contain millions of tiles.

At a particular scale, and in a particular cartographic projection, a <TileMap> is represented by a <TileSet>, a coverage of regularly sized and spaced images that taken together form a complete visual representation of the entire area of coverage of the <TileMap>.

Each <TileMap> supports one <SRS> and one image format. To support more than one SRS or image format, define extra <TileMaps> in your <TileMapService> for each combination you want.

Optional metadata elements are called out in the resource below with the pipe character.

Request:

http://tms.osgeo.org/1.0.0/vmap0/

Response:

<?xml version="1.0" encoding="UTF-8" ?>
<TileMap tilemapservice="http://tms.osgeo.org/1.0.0/">
<Title>VMAP0 World Map</Title>
<Abstract>A map of the world built from the NGA VMAP0 vector data set.</Abstract>
| <KeywordList></KeywordList>
| <MetadataURL type="TC211">
| <Format>text/xml</Format>
| <OnlineResource href="http://www.org" />
| </MetadataURL>
| <Attribution>
| <Title></Title>
| <OnlineResource />
| <LogoURL width="10" height="10">
| <Format>image/gif</Format>
| <OnlineResource href="http://www.org" />
| </LogoURL>
| </Attribution>
| <WebMapServerURL>
| <OnlineResource href="http://wms.org" />
| </WebMapServerURL>
<SRS>EPSG:4326</SRS>
<BoundingBox minx="-180" miny="-90" maxx="180" maxy="90" />
<Origin x="-180" y="-180">
<TileFormat width="256" height="256" mime-type="image/jpeg" extension="jpg" />
<TileSets>
<TileSet href="http://tms.osgeo.org/1.0.0/vmap0/levelzero" units-per-pixel="0.703125" order="0" />
<TileSet href="http://tms.osgeo.org/1.0.0/vmap0/levelone" units-per-pixel="0.3515625" order="1" />
<TileSet href="http://tms.osgeo.org/1.0.0/vmap0/leveltwo" units-per-pixel="0.17578125" order="2" />
<TileSet href="http://tms.osgeo.org/1.0.0/vmap0/levelthree" units-per-pixel="0.08789063" order="3" />
</TileSets>
</TileMap>

Request:

http://tms.osgeo.org/1.0.0/landsat2000/

Response:

<?xml version="1.0" encoding="UTF-8" ?>
<TileMap tilemapservice="http://tms.osgeo.org/1.0.0/">
<Title>British Columbia Landsat Imagery (2000)</Title>
<Abstract>Landsat data collected in the year 2000 over British Columbia.</Abstract>
| <KeywordList></KeywordList>
| <MetadataURL type="TC211">
| <Format>text/xml</Format>
| <OnlineResource href="http://www.org/" />
| </MetadataURL>
| <Attribution>
| <Title></Title>
| <OnlineResource />
| <LogoURL width="10" height="10">
| <Format>image/gif</Format>
| <OnlineResource href="http://www.org/" />
| </LogoURL>
| </Attribution>
| <WebMapServerURL>
| <OnlineResource xlink:href="http://wms.org/" />
| </WebMapServerURL>
<SRS>EPSG:3005</SRS>
<BoundingBox minx="100000" miny="100000" maxx="1800000" maxy="1800000" />
<Origin x="100000" y="100000">
<TileFormat width="256" height="256" mime-type="image/png" extension="png" />
<TileSets>
<TileSet href="http://tms.osgeo.org/1.0.0/landsat2000/32" units-per-pixel="3200" order="0" />
<TileSet href="http://tms.osgeo.org/1.0.0/landsat2000/16" units-per-pixel="1600" order="1" />
<TileSet href="http://tms.osgeo.org/1.0.0/landsat2000/8" units-per-pixel="800" order="2" />
<TileSet href="http://tms.osgeo.org/1.0.0/landsat2000/4" units-per-pixel="400" order="3" />
<TileSet href="http://tms.osgeo.org/1.0.0/landsat2000/2" units-per-pixel="200" order="4" />
<TileSet href="http://tms.osgeo.org/1.0.0/landsat2000/1" units-per-pixel="100" order="5" />
</TileSets>
</TileMap>

===Tile Resources===

The origin of a <TileMap> is defined in the coordinates of the spatial reference system of the <TileMap>. The x-coordinate of the tile numbers increases with the x-coordinate of the spatial reference system, and the y-coordinate of the tile numbers also increases with the y-coordinate of the spatial reference system.

Tiles are addressed under the "href" specified in the <TileSet> appending the "x" tile coordinate as a directory name and using the "y" tile coordinate as the file name, with the file "extension" from the <TileFormat>.

Example:

The tile at the origin of the tile set in the first zoom level of vmap0.
<nowiki>http://tms.osgeo.org/1.0.0/vmap0/levelzero/0/0.jpg</nowiki>

The tile near the middle of the tile set in the third zoom level of vmap0.
<nowiki>http://tms.osgeo.org/1.0.0/vmap0/leveltwo/3/4.jpg</nowiki>

The tile near the middle of the tile set in the fifth zoom level of landsat2000.
<nowiki>http://tms.osgeo.org/1.0.0/landsat2000/1/8500/8500.png</nowiki>

===TileMap Diagram===

(this is where a diagram of how the Origin, Bounding Box, tile numbering and so on all tie together)

==Implementation Advice==

===Maximizing Interoperability===

Using this server specification will ensure that clients can easily consume your tiled map data. However, it will not guarantee that clients can efficiently overlay your data with data from other tile map servers. In order to maximize the interoperability of your tile map with other tile maps, you must implement the "global profile" for your tile map.

(Services implementing the "global profile" should be flagged as such by setting the "global-profile" attribute in the <TileMap> element of the <TileMapService> resource to "1".)

In order to conform to the "global profile" a TileMap must meet the following requirements:

* Must use <SRS>EPSG:4326</SRS>
* Must provide <TileSet>s with units-per-pixel meeting the following formula for any integral value of "n" greater than or equal to 0: units-per-pixel = 0.703125 / 2^n

===Maximizing Cacheability===

Tile maps are usually base maps, and usually represent data that changes on a very slow cycle. They are also usually large in volume, comprising potentially millions of different tiles. Given these basic facts, the aggressive use of caching strategies can optimize performance of tile map services.

Caching can happen at multiple layers between the server and the client:

* At the client itself, as the user-agent caches results on the local disk.
* In a shared cache at an intermediate ISP, allowing multiple users of the ISP to pull data from the cache.
* In a cache on the server itself, to move load from the tile generator to a simpler caching process.

In order for caching to occur at any of these layers, the caching mechanisms need to know when a resource is cachable.

(more TBD.....)

====See Also====

[http://www.peej.co.uk/articles/http-caching.html HTTP Caching]

All Members

2006-03-08T19:11:59Z

Wiki-Bartvde:

{| border="1" class="wikitable"
! style="background:#efefef;" | Name
! style="background:#ffdead;" | Affiliations
! style="background:#efefef;" | OSGeo Projects
! style="background:#ffdead;" | (Lat,Lon)
! style="background:#efefef;" | About
|-
| Chris Holmes
| [http://topp.openplans.org The Open Planning Project], [http://geoserver.org GeoServer]
| [http://incubator.osgeo.org Incubator], [http://board.osgeo.org Board], [http://geotools.org GeoTools]
| (40.72,-74.00)
| I come from the Java side of the OSGeo fence, getting my start in GeoServer, where I was lead developer for a couple years, and GeoTools, where I still serve on the PMC. My time is made possible by [http://topp.openplans.org The Open Planning Project (TOPP)], a great non-profit in New York that has been the lead supporter of GeoServer for years now. I spent the last year in Zambia on a Fulbright Scholarship, looking at the potential for open source software to help implement spatial data infrastructures in developing countries. It was a bit of a failure, but I learned a ton, and I see a lot of potential for open source in developing countries, towards truly open spatial data infrastructures. I'm back at TOPP, in a new role as VP of Strategic Development, helping to grow the organization, and figuring out how to make our geospatial stuff self sustaining. Once that's rolling, I hope to reinvest extra revenue in to figuring out and building a truly open geospatial web. And just like apache and linux are the bedrock that the World Wide Web rests on, so too do I believe that the geospatial web necessarily must be built on a foundation of OS Geo software. My continuing thoughts on all of this can be found at http://cholmes.wordpress.com
|-
| Michael P. Gerlek
| [http://www.lizardtech.com LizardTech]
| [http://visibilitycommittee.osgeo.org Promotion and Visibility Committee]
| (47.673166,-122.530143)
| Engineer at LizardTech, doing MrSID and JPEG 2000 stuff. Playing with with the next generation of technologies for supporting raster data GIS workflows.
|-
| Frank Warmerdam
| Independent
| [http://www.gdal.org GDAL/OGR], [http://mapserver.gis.umn.edu MapServer], [http://incubator.osgeo.org Incubator], [http://board.osgeo.org Board]
| (45.45,-77.25)
| Lead developer of GDAL/OGR and freelance geospatial software developer.
|-
| Jason Birch
| [http://www.nanaimo.ca/ City of Nanaimo]
| [http://webcommittee.osgeo.org Web Site], [http://visibilitycommittee.osgeo.org Promotion & Visibility]
| (49.155, -124.005)
| I am a long-time GIS/IT/'Net junkie, and am currently working for the City of Nanaimo's IT department as a Sr. Applications Analyst (GIS Specialist). I am excited about what I see happening in the open source geospatial world, with OSGeo as a catalyst. [[User:Jasonbirch]]
|-
|Howard Butler
| [http://www.hobu.biz/ Hobu, Inc]
| [http://webcommittee.osgeo.org Web Site Committee],
| (42.00, -93.00)
| MapServer hacker, MTSC member. GDAL hacker. ESRI ArcSDE hack. Purveyor of Windows binary builds [[User:hobu]]
|-
| Markus Neteler
| [http://mpa.itc.it ITC-irst], [http://www.cealp.it CEA], [http://www.gdf-hannover.de GDF Hannover]
| [http://grass.itc.it GRASS GIS], [http://board.osgeo.org Board], [http://visibilitycommittee.osgeo.org Promotion & Visibility]
| (46.06714, 11.15113)
| Developer of GRASS GIS, researcher at ITC-irst + CEA, Trento, Italy and co-founder of GDF Hannover [[User:neteler]]
|-
| R. Paul Warriner
| [http://www.orchardparkny.org/ Town of Orchard Park]
| [http://webcommittee.osgeo.org Web Site Committee]
| (43.17, -78.69)
| Network Coordinator, old oil field hand (really, I do know what a frac job is), started with remote data comm. from well sites in '84 as a truckdriver, turned computer jockey by Linux in '93, found ArcView 1.0 the same year (I think), and the rest is ..... (oh yeah, I did some of that Calculus, Organic Chemistry, and Thermo thingy stuff along the way). [[User:RPaulW]]
|-
|Bart van den Eijnden
| [http://www.osgis.nl/ OSGIS]
| [http://chameleon.maptools.org Chameleon],
| (52.0768396070808, 5.12454)
| Freelancer working with several open source GIS tools, mainly Chameleon, Mapserver and Geoserver.
[[User:bartvde]]
|-
| Add yourself
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| Just edit the wiki (login/join in upper right corner)
| Input lat/long here
| Copy and paste this entry, put it last, and change the one above to your information
|}