National Map Production with
Mapnik Rasterizer
Ordnance Survey Ireland- Vector to Raster
Ciara Beddy
IMGS
Ordnance Survey Ireland- National Mapping
Agency
Ordnance Survey creates and maintains
Ireland’s mapping and related geogr...
OSI Raster Mapping- 1:5000
OSI Raster product is derived from vector data and reproduced like for like
The existing vector...
OSI Existing Raster Data
At present OSi have no
available resource to produce
a current 1:5000 raster product
Last produce...
MapnikRasterizer
OSi turned to IMGS & FME to automate the provision of a country wide raster dataset
Use of Mapnik Rasteri...
There are approx 7,000 tiles covering Ireland, each measuring
4000m x 3000m (1200ha). Each tile represents a 1:5000 raster...
Mapnik High Level Process
A total of 80 style rules are created that have one or more layers
associated with each.
Build c...
Demonstration
Challenges Source Data
Source Data– Inconsistency
Data stored in wrong layer
Duplicated data- Both line and polygon
You ca...
Challenges- Running the data
The volume of data required to be processed needed a automation workspace and
run on Server
End Result
Vector GeoTIFF
Why is this transformer so powerful?
Graphic interface for
Mapnik
Sophisticated symbols &
Shading
Transformation
Possibili...
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National Map Production with Mapnik Rasteriser FME

The aim of this project was to transform an Ordnance Survey Ireland NTF vector dataset into GeoTIFF rasters using FME. In the past OSI would have produced a 1:5000 raster tiles through old legacy software but now that software has reached end of life and is no longer supported. As part of FME 2014, FME and Mapnik have been brought together to create the MapnikRasterizer which was perfect timing for the OSi.
Published on: Mar 3, 2016
Published in: Software      
Source: www.slideshare.net


Transcripts - National Map Production with Mapnik Rasteriser FME

  • 1. National Map Production with Mapnik Rasterizer Ordnance Survey Ireland- Vector to Raster Ciara Beddy IMGS
  • 2. Ordnance Survey Ireland- National Mapping Agency Ordnance Survey creates and maintains Ireland’s mapping and related geographic databases Produces a number of mapping products in a variety of scales in both digital and paper formats One of the main departments and products produced by OSI are Large scale maps (1:1000, 1:2500, 1:5000)
  • 3. OSI Raster Mapping- 1:5000 OSI Raster product is derived from vector data and reproduced like for like The existing vector (point, line, polygon and text) dataset is coded to represent topographical features – Total of 130 possible layers FEATURE_CODE DESCRIPTION GEOM 512 FENCE AND WALL POLYGONS POINT,LINE,POLY,TEXT 526 DECIDUOUS FORESTRY POINT,LINE,POLY,TEXT 527 CONIFEROUS FORESTRY POINT,LINE,POLY,TEXT 531 POLYGONS AND NAMES OF RIVERS POINT,LINE,POLY,TEXT 533 NAMES AND OUTLINES OF LAKES POINT,LINE,POLY,TEXT 550 MOTORWAY GEOMETRY POINT,LINE,POLY,TEXT 589 SOLID BUILDINGS POINT,LINE,POLY,TEXT 611 TOWNLAND BOUNDARY GEOMETRY POINT,LINE,POLY,TEXT
  • 4. OSI Existing Raster Data At present OSi have no available resource to produce a current 1:5000 raster product Last produced in 2009, the data is outdated Poor Quality Existing OSi Raster Dataset is in use by emergency callout services, Fire, Ambulance and Police
  • 5. MapnikRasterizer OSi turned to IMGS & FME to automate the provision of a country wide raster dataset Use of Mapnik Rasterizer to style the 130 feature codes
  • 6. There are approx 7,000 tiles covering Ireland, each measuring 4000m x 3000m (1200ha). Each tile represents a 1:5000 raster Tiles are made up OSi Vector data in a combination of scales 1:1000, 1:2500 & 1:5000 OSI Raster Mapping 1:5000 Coverage 1:2500 & 1:1000 NTF Tiles
  • 7. Mapnik High Level Process A total of 80 style rules are created that have one or more layers associated with each. Build complex styles very easily using the symbolisers in Mapnik and simple .png files Most commonly used Symbolizers ; LINE PATTERN POLYGON PATTERN POINT- TRANSFORM
  • 8. Demonstration
  • 9. Challenges Source Data Source Data– Inconsistency Data stored in wrong layer Duplicated data- Both line and polygon You can use any of FME’s 460 transformers to validate the data and correct it to meet the requirements before processing to Mapnik- The output was greater than then input
  • 10. Challenges- Running the data The volume of data required to be processed needed a automation workspace and run on Server
  • 11. End Result Vector GeoTIFF
  • 12. Why is this transformer so powerful? Graphic interface for Mapnik Sophisticated symbols & Shading Transformation Possibilities Automation

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