use of land use maps nl - challenges - europa · check deforestation 2013-2017 check on the basis...
TRANSCRIPT
Use of land use maps NL - challenges
JRC LULUCF workshop
29 May 2019, Eric Arets
5 Maps 1990-2017
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What to do with changing total area?
Area increase ~5000 ha
● Maasvlakte 1500 ha
● Border corrections, mainly with Belgium
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2017 Land-use map
Other grassland
Nature grassland
Trees outside forest
Arable land
Heath land
Forest
Built up area
Water
Reed swamp
Drifting sand
Dunes, beaches and sand plates
Uncertainties in LUC
High resolution maps
Gridded to be able to follow changes
● 25m x 25m gridcells
● Majority rule applies most dominant LU to gridcells
Total area per LU type very low uncertainty
Changes in LU per gridcell are much more uncertain
LU changes in gridcells are followed over time
Approach 3?
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Random noise? How to deal with it?
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Check on classification of deforestation
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Controle ontbossing 2013-2017
Comparison 2013 and 2017 kaart
● 140.202 polygons deforestation
● 20.232 ha deforestation
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Controle ontbossing 2013-2017
Comparison 2013 and 2017 kaart
● 9.008 polygons checked (6,4%)
● 7.625 ha deforestation checked (37,7%)
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Check deforestation 2013-2017
Check on the basis of aerial photos:
1: Correct
● 11: temporary forest
● 12: conversion to other nature areas
● 13: deforestation, but before 2013
2: Not correct
● 21: border effect
● 22: border along road/bike road
● 23: was misclassified as forest before
● 24: wood harvesting
● 26: high voltage line
3: Not certain
4: Part of polygon correct, part incorrect
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Temporary (set aside) forest 2008
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Temporary (set aside) forest 2015
Nature development 2008
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Nature development 2015
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Nature development 2008
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Nature development 2015
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Felling area 2008
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Felling area 2015
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Randeffecten 2008
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Randeffecten 2015
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A330
Monitoring land-use change
Mapping land use is not very difficult
Comparing changes in total areas of different land uses is also doable!
Spatial explicit monitoring of land-use changes over time according approach 3 is very challenging
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