1. Production of Topographic data products
In National Land Survey
Teija Tarvainen
Aalto yliopisto

2. Contents What are the products and goals of delivery
Production processes for different products
The delivery of products

3. The Products Aerial Photographs and orthophotos
Laser scanning data and elevation models (2 and 10 m grid)
Topographic database
Small scale databases (1: , 1: , …1:4,5 mill.)
Raster maps
Topographic maps
Background maps

4. The goals of delivery
To deliver as much data as possible – open data in use
To deliver as up-to-date data as possible
To offer data to wide range of systems both commercial and open source
To use standards whenever possible
To keep the range of formats and different product versions as small as possible and still meet the customer needs
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Formats: GML, shape, mif, Geotiff, ascii grid, PNG, JPEG2000
Weekly processes to update the files
Data is offered as predefined files (map sheet devision) and WMS- and WMTS-services

5. Aerial photographs and orthophotos
Every area of Finland is photographed in five years cycle
The national aerial photographing program
Spring and summer photographing every other time to meet mapping and forestry needs
Orthophotos are produced few months after
When orthophoto is finished it’s available in all services right away
The data storage system has ability to always pick the latest and best photo of each place
Formats TIFF (only manual deliveries), JPEG2000

7. Laserscanning data and elevation models
Covers now about 70 % of Finland
Laserscanning is done in two quality classes
1st class quality scannings are done in spring
2nd class quality scannings are done in summer
2 m elevation model is produced using laserscanning data
10 m elevation model covers the whole of Finland
Laserscanning in laz (packed las) format
Elevation models in ascii grid and geotiff

8. Topographic Database Production
JAKO Smallworld GIS
updating & quality improvement
regular updating (5-10 year)
annual road network updating and building updating
digital photogrammetry (157 stereo workstations)
continuous database over Finland
3 districts:
Southern
Middle
Northern
210 persons.

9. Topographic Database in Numbers
Vector data in nominal scale 1: including 1: texts
10 million areas
8 million symbols
2.5 million texts including GNR placenames.
GNR 1: place names:
46 million chains
2 billion line points
25 m DEM height values: 540 million
10 m DEM height values: > 3 billion
2 m DEM height values: 85 billion
> 400Gb

11. Topographic database
Extract application keeps record of changes in data
File is extracted every night if a change has happend on it
There is always available the same situation as in database
Delivery formats GML, shape, mif

13. Small scale databases
Updated yearly
Formats shape, mif

14. Raster maps New production system built in 2014
SLD-technique used to create the style for maps
Automates the whole process, weekly updates
All data is loaded to PostGIS database
Raster map files are produced using Geoserver and SLD- style files
Same process produces files to download service and WMS- and WMTS-services
PNG format, anti-aliased map-files
Pixel sizes according to WMTS-tile standard (JHS180: 0.5 m, 1 m,2 m,4 m,8 m …)

15. Technical description
Visulataus01.nls.fi
Visukartta
PostgreSQL/PostGIS-database
ATOM-feed, Java-download
Geoserver
PostgreSQL/
PostGIS
PostgreSQL/
PostGIS
WMS-service
rsync
http, WMS
http, WMS
https,
ATOM
F5 Big-IP load balancer
File service of open
data
Visurasteri02.nls.fi
interface
(WMTS)
Production of raster maps
File storage

16. The delivery of products
Download service: Open data file download service
Manual deliveries, memory stick or hard disk
Service interfaces, WMS, WMTS
WFS services for addresses, place names and a pilot WFS service for Topographic database
View services MapSite, Paikkatietoikkuna
Also other organisations offer NLS Topographic data
Download services: Kapsi ry, ESRI online
Mobile services: Karttaselain, Mapitare, B-Bark

17. Services provided by the File Service application
File service of open data (Map Interface)
lang=en
INSPIRE Download Service (ATOM)
File service for updated files
Based on ATOM / Modified INSPIRE
Distribution of arbitrary files through ”directory listing HTML-interface”
Internal Admin Web UI
Internal Application Integration API
These are essentially different user interfaces to a single application backend

20. Admin interface
Dataset metadata management
File & metadata browser
Access rights management

21. Conclusion and future The production processes must be automated
The delivery must be efficient
The data must be up-to-date
New techniques and standards might simplify the products and formats even more in the future
Maybe we only need to deliver vector database in GML and give the SLD style files
Or maybe we only have an interface and the user modifies SLD to get the map he wants (dynamic WMS)

22. Teija.tarvainen@maanmittauslaitos.fi www.maanmittauslaitos.fi
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