FME and LabelEZ – when 1 + 1 = 3

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MapTextLabeller - when 1 + 1 = 3 Peter Laulund Cand. scient. Specialkonsulent

Who am I

!  Peter Laulund !  Certified FME professional !  Works at Geodatastyrelsen !  Working with FME since 1997 and with

SpatialDirect / FMEServer since 2000 !  Recent Projects

!  GST Data distribution system !  GST INSPIRE data to GML !  Labeling our cadaster with MapTextLabeller

Background

!  In 2008 we got a new Cadastral system !  This system has no cartographic labels !  To create labels for this system, MapText

developed an integration between Label-EZ and FME

!  With FME 2013 this was integrated into standard FME as an extra cost plugin, the MapTextLabeller

!  With this transformer we now have intelligent rule based labelling in FME

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Cadastral dataset

!  2.4 mill. parcels !  45 mill. features in 30 feature types !  3.8 mill. labels !  9033 districts – Ejerlav in Danish !  Changes in 20 to 100 districts per day !  Data are free !  Available in 10 formats and a number of

projections

Rule based label creation

MapTextLabeller - Features

!  Place label inside or parallel to feature !  Rotate and / or scale to fit inside !  Place outside with leader line !  Split on multiple lines !  Handel conflicts !  Add style – font and color

Label workspace

Demo

System architecture

Job_view

Log

Label

Matrikel

BATCH.fmw

LABEL.fmw

Log2Html.fmw Log2day.html

FMEServer Oracle

Workspace – batch

select SEQ_LBZ_JOBID.NEXTVAL "JobId" , a.* from job_label a

JOB View – Pseudo sql

create view JOB_LABEL as Select ejerlav from ( select ejerlav , jordstykke.from_time as j_from_time , nvl(label.from_time, ‘17530501’) as l_from_time from jordstykke left join label (on jordstykke.id = label.id ) group by ejerlav ) where j_from_time > l_from_time

Database design

!  In GST we use Oracle as company database !  Tables to label features !  Log and error log table !  Lookup and metadata tables !  Job view to control the daily update !  Sequences and triggers for ‘house keeping’ !  createDb.sql script to create the database

!  Including a cmd script to run it in batch

Database design

!  Oracle has no text feature !  We save the text parameters as string, font, size,

rotation and the geometry as a point !  Reading is done using sql converting text

parameters into fme system attributes, in FME we convert the geometry to a text with TextAdder

!  Different formats handle text differently, we therefore has to scale and offset the text feature depending on the output formats

Database design

MAT_TEKST Feature Id JobId Ejerlav Font Font size

MAT_LEADER Geometry

MAT_TEKST_ELEM SubString Rotation Geometry

CADASTRE

FEATURE_CODE

METADATA

FONT

LOG JobId BatchId Ejerlav Time

SEQUENCE BatchId JobId

JOB_LABEL

Reading from the database

SELECT ...... , MTE_SUB_TEKST AS "fme_text_string" , MTE_ROTATION AS "fme_rotation" , MAT_TEXT_SIZE AS "fme_text_size" , MTE_INDSAT_KODE AS "fme_justification" , MTE_COLOR AS "fme_color" , FNT_FONT AS "kms_font" , FNT_BOLD AS "kms_bold" , 'fme_text' AS "kms_type" , MTE_GEOMETRI AS GEOMETRI FROM MAT_TEKST_ELEM JOIN MAT_TEKST ON ( MTE_MAT_ID = MAT_ID AND MAT_TIL_DATO IS NULL ) .....

Log rapport

Design principles

!  Let the database do the job !  Generic workspace

!  Separate logic data and metadata !  Place metadata, initiation, script etc. outside the

workspace !  Control data flow with transformation attributes

rather than feature types !  All jobs is logged to a database

Problems

!  We can still work with the rules !  Where there is many small parcels the labels are

not ok !  Sometime the leader lines points to an incorrect

parcel !  There is an bug in Oracles buffer function

!  ..SDO_BUFFER(geometri, 65 + mod(to_char(sysdate, 'SS' ), ..

Conclusion

!  The system is working and has now been in production for 8 months

!  In general the labels is ok, but we can still improve some of the rules

!  We can label the whole country in 20 hours !  By combining FME and LabelEZ we get best from

both programs

FME + Label-EZ = 1 + 1 = 3

Thank You!

!  Questions?

!  For more information: !  Peter Laulund, pelau@gst.dk !  Geodatastyrelsen - The Danish Geodata Agency

!  Safe blog !  Webinar

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