Has EO found its customers? Global Vegetation Monitoring Unit GLC2000 GLOBAL LEGEND GLC 2000 –...
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Transcript of Has EO found its customers? Global Vegetation Monitoring Unit GLC2000 GLOBAL LEGEND GLC 2000 –...
Has
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Global Vegetation Monitoring Unit
GLC2000 GLOBAL LEGEND
GLC 2000 – “FIRST RESULTS” WORKSHOPJRC – Ispra, 18-22 March 2002
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Global Vegetation Monitoring Unit
GLC land cover classification approach
Land cover described by classifiers and attributes (of vegetation / non-vegetation) at detail possible - using the FAO LCCS standards & software
No fixed legend and no fixed class names
Different legends or classes can be generated by grouping of classifiers and attributes
Detail of class description at a given geographical level depends on the • information obtainable from Remote Sensing (VEGETATION) • capability to map a class consistently• auxiliary map or information sources
Compatibility at higher levels by grouping of classifiers and attributes
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Global Vegetation Monitoring Unit
Arguments for this approach
the user is not forced to squeeze a regional / local class in a predefined global class name or legend
>>e.g. forest > 60 percent tree cover
regional or sub-regional maps can be produced with legends and class names which meet the needs at this level
>>e.g. detailed steppe and desert classes, detailed boreal forest types
direct links are possible to the national scale or field observations - if these are also coded with LCCS
legends can be adapted to specific purposes at the same geographical level : >>e.g. desertification monitoring, forest cover assessment,
carbon stock inventory, …
>> enlarge the potential applications and user group
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Global Vegetation Monitoring Unit
Minimum set of required classifiers
Objective of GLC2000:
Global land cover classification
• uniform
• consistent
• comparable across regions
DEFINITION OF A MINIMUM SET OF REQUIRED CLASSIFIERS
mandatory for describing vegetation cover classes
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Global Vegetation Monitoring Unit
Example for a general class: ‘Cropland’ (terrestrial)
‘Cultivated and Managed Terrestrial Areas’
no further classifiers obligatory as ‘Minimum’
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Example for more detailed requirements: ‘Natural vegetation’ (terrestrial)
Life form Cover Leaf type Phenology Layering
Woody closed-open
Trees closed-open closed open
broadleaved needleleaved
evergreen deciduous
Shrubs closed-open closed open
broadleaved needleleaved
evergreen deciduous
Herbaceous closed-open no (more) layer sparse shrubs sparse trees
Lichens &Mosses
based on SPOT VGT added ancillary data based SPOT VGT or ancillary data
Note: In case of missing ancillary information on additional sparse layers the classifier ‘layering’ could be dropped.
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Global Vegetation Monitoring Unit
Definition of a class by dominant life form with classifiers and attributes
A3 A10//A12 E1 D1Code: 2xxxx / B7 P3
GRASS LAYER Herbaceous Closed(100-65%)
Tree cover Sparse(5-15)
Second layer
Definition of legend and classes depending on geographical level and purpose
Code: 2xxxx / A2 A10//A12 D1F2 F2
Vegetation with woody components: A3 F2 D1Code: 2xxxx /
TREE LAYER Trees Closed(100-40%)
Evergreen Broadleaved Height3-7m
Elevation1500-3000
mandatory for global level e.g. regional /non-mandatory
Evergreen Forests: A3 E1Code: 2xxxx /
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Global aggregation scheme
1.
Tree Cover closed, broadleaved, evergreen(LCCS >65% and >40-65% tree cover, tree height >3m )
2.
Tree Cover closed, broadleaved, deciduous
3.
Tree Cover closed, needleleaved, evergreen
4.
Tree Cover closed, needleleaved, deciduous
5.
Tree Cover closed, mixed phenology or leaf type
6.
Tree Cover open, broadleaved, evergreen(LCCS 15-40% tree cover, tree height > 3m)
7.
Tree Cover open, broadleaved, deciduous
8.
Tree Cover open, needleleaved, evergreen
9.
Tree Cover open, needleleaved, deciduous
10.
Tree Cover open, mixed phenology or leaf type
11.
Tree Cover, Regularly flooded, any type
12.
Shrub Cover, closed-open, evergreen(with or without sparse tree layer)
13.
Shrub Cover, closed-open, deciduous (with or without sparse tree layer)
14.
Herbaceous Cover , closed-open
15.
Herbaceous Cover, closed-open with sparse trees or sparse shrubs
16.
Sparse Herbaceous or sparse shrub cover
17.
Lichens & Mosses
18.
Regularly flooded shrub and/or herbaceous cover
19
Regularly flooded cover of lichens and mosses
20.
Cultivated and managed areas, terrestrial
21
Cultivated aquatic or regularly flooded
22
Tree cover / Other natural vegetation
23
Cropland / Natural vegetation
24 Bare Areas
25.
Water Bodies (natural & artificial)
26.
Snow and Ice (natural & artificial)
27
Artificial surfaces and associated areas
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Significant LCCS codes and classifiers for extraction
1.
2*& A3, A10,A11,A12, D1, E1,
2.
2*& A3, A10,A11,A12, D1, E2
3.
2*& A3, A10,A11,A12, D2, E1
4.
2*& A3, A10,A11,A12, D2, E2
5.
2*& A3, A10,A11,A12, D1+// D2 or E1//E2
6.
2*& A3, A11+A13, D1, E1,
7.
2*& A3, A11+A13, D1, E2
8.
2*& A3, A11+A13, D2, E1
9.
2*& A3, A11+A13, D2, E2
10.
2*& A3, A11+A13, D1//D2 or E1//E2
11.
4*& A3, A12-13-14-15
12.
2*& A4, D1-2, E1 and optional F2,F5
13.
2*& A4, D1-2, E2 and optional F2,F5
14.
2*& A2-5-6, A10-11-12-13
15.
2*& A2-5-6, F2, F5-6 2*& A3, A14-15-16 or 4*& A3, A16-17-18
16.
2*& A2-5-6, A14-15-16 or 2*& A4, A14-15-16
17.
2*& A7-8-9
18.
4*& A4, D1-2, E1-2, F2,F5
19
4*& A2-5-6-8-9 or 4*&A7-10-11
20.
0*& A11
21
0*& A23
22
2*& A3 and A2-4-5-6 or C2, F2, F4-6 or /0004 or 4*& A3, A2-4-5-6-8-9 or /0004
23
0*/ 2*& A2-3-4-5-6 or 0*/ 4*& A2-3-4-5-6-8-9
24 6*
25.
8*& A1 or 0*& B27
26.
8*& A2-3
27
0*& B15
* to be checked / complemented
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Global Vegetation Monitoring Unit
Issues to be addressed during the working groups
at global level:
changes at the global aggregation scheme only if absolutely required
can the regional classes be converted into the global level?
can the global aggregation level be consistently achieved?
at regional level:
more detailed cover classes possible / desired
can an agreement on a ‘regional legend’ be achieved?
proposed starting topic of first WG
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Global Vegetation Monitoring Unit
Remarks to LCCS coding
Threshold between closed and open forests appears to be more appropriate at 40% canopy cover:
Forest closed : LCCS class ‘closed 40% -100%’ + LCCS class “open 40-65%’ , Forest open: LCCS class ‘open’ 15-40%
Can the 40% threshold be achieved as it was not set in the initial requirements?
Present version of LCCS does not allow ‘thematic mix’ of 2 classifiers in one step
a mixed unit needs to be defined with 2 sub-components
User comment ‘//’ is required in order to differentiate a thematic from a spatial mix!
User labels (names) should be assigned with regional / local class names
User comments in case a class does not meet global legend:Example: Closed –open >>assigned to closed
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the end…