Extension to Geoserver for reading ESRI Mapcaches

Pär JonssonProject managerLantmäteriet, Swedenpar.jonsson@lm.se

Mauritz BomarkSystem architectLantmäteriet, Swedenmauritz.bomark@lm.se

FOSS4G 2009, SidneyFriday 23 octoberParkside auditorium

62O62

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About Lantmäteriet

The leading producer in Sweden of geographic databases and maps.Responsible for property formation and land authority.Provide an extensive amount of geospatial data to the market.

About Lantmäteriet

The total staff is approx. 2,000. and 10 % is working at the IT-department.

The head office is situated in Gävle, 200 km north of Stockholm

• New SDI – in-house department to department

• New NSDI - government to government• PSI – private to government• Inspire (EU) - country to country

New requirement's and directives concerning geodata

Basis for all new requirement's is maps with high availability!

• Standardized web map• Pretty map • Flexible map • Fast map• Up-to-date map• Multi Sweden map

Business requirements for viewing services?

• Available via WebMapService-interface• Support both tiling and non-tiling clients• An implementation that fits in our enterprise

architecture (java)

Standard web map WMS

Pretty map• A new map product for screen

presentation with:

– High quality cartography– Harmonized cartography– Soft colors– Scale dependent symbolization (i.e

symbol and text placement)– No manual cartographic treatment

Map

Fast map • A fast WMS-solution (<1,5 sek)

Flexible map• A flexible layered WMS-solution

WMSserver

Head office

Up-to-date map• Updated maps on a daily basis

• Fast cartographic treatment in runtime

Multi Sweden map• Cover Sweden

• Include data from all 6 map series

Map

WMSserver

Map

WMS

Productionenvironment

• Geoserver for serving WMS– Architecture

• Tile pyramid plugin– Geoservers Geotools Grid Coverage

integration– Reads ESRI mapCache

• Pre rendered tile pyramids– Performance, intelligent updating– Several choices identified – image pyramid &

image mosaic, GeoWebCache, Tilecache, mapCache…• ESRI’s mapCache feature in ArcGIS server• Extensive ESRI use in production lines for

our map databases• High quality cartography - mxd

Design solution

TPP

ESRI mapCache format

• /L00/R0000029f/C00000280.jpg– L00: Level ID – R0000029f: Cache tile row in padded

hexadecimal format – C00000280.jpg: Cache tile column in padded

hexadecimal format – conf.xml – meta data (levels, spatial reference,

image format, image size, image resolution etc)

WMSserver

Map

TPP

Getmap Flow

• Getmap request passed through Geoserver to the plugin (per layer)– Calculate level in the pyramid– Calculate tiles affected by the requested

bbox– Read tiles and create JAI Mosaic– Crop according to bbox– Return GridCoverage to Geoserver

• Resize to requested resolution• Merge layers• Return requested image

WMSserver

WMS

TPP

Configuring the tile pyramid plugin

Configuration parameters• Standard Grid Format parameters (SRS, style

etc)• LevelSelectionInterval (% between layers)

• LowestValidResolution (m/pixel)• MaxImageSize (pixels)

WMSserver

100%

0%

TPP

Experiences of Geoserver and the tile pyramid plugin

Server configuration• Java 1.6• Native JAI• JAI-settings (Geoserver)• Garbage Collection (JVM)

Hardware configuration

GeoServer GeoServer

Web Server

LB

WMSProxy

JBOSS

Apache

JBOSSDual Core 3Ghz3 GB RAM

JBOSSDual Core 3Ghz3 GB RAM

Performance

#Threads Median ms Requests/sec

1 315 2.38

5 315 11.87

10 316 21.53

25 329 35.26

30 323 36.39

40 472 36.16

50 522 32.70

10 ms delay

#Threads Median ms Requests/sec

1 229 1.12

500ms delay

512*512 pixelsBilinear renderingPNG

Standard web map, WMS (WMTS)Pretty map , quite pretty mapFlexible map, 12 layersFast map, speed enough!Up-to-date map, intelligent updating is runningSweden is covered! – 1 layer consists of 13 levels (0.5 m/p –

2480 m/p) -> approximately 45 million tiles/layer.

– 12 layers -> 540 million tiles.

In production since july 2009, with both internal and external useThe source code for the Tilepyramid plugin is available!

Summary

That’s all

Thanks!