Title

First name SURNAMEPosition

Place, date

Name of the entity

The grid approach: Practical implementation, advantages and disadvantages and comparison

with CLC

Geir-Harald STRANDDirector, Land resource surveys

Copenhagen, 19-20 Oct 2014

NIBIO, Norway

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 2

«The universe» - here represented by a topographic map

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 3

Survey approach: Delineation and classification of land units

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 4

The grid approach: A regular geometry of grid cells

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 5

The grid: Units are characterized - not classifed

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 6

Urban Open built-up Agriculture Forest Open land Mire Water

The grid: A data rich model populated with data from many sources

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen

Net changes – Gross changes

7

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 8

+

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 9

GEOSTAT 1AGEOSTAT 1BGEOSTAT 2

http://www.efgs.info/

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen

Appropriate grid cell size?

10

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen

Resolution – 1 km compared to CLC

11

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen

Resolution

12

EEA (2010) reporting 5 424 171 km2 as the total area covered

220 000 grid cells with a 5 x 5 km grid model 5 500 000 grid cells with a 1 x 1 km grid model

500 000 000 grid cells with a 100 x 100 m grid model

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen

Advantages

13

• Unbiased statistics• Suitable for modelling and analysis• Integrate data from various sources• Improved access to restricted datasets• INSPIRE compatible• Tools available (production, analysis and visualization)• Improved cooperation with other sectors (e.g. NSAs)

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 14

Disadvantages

• Unfamiliar geometry• Backward compatibility with pre-grid CLC• Variable quality and specification of input data

Challenges

• Handling mixed and scale-dependent CLC classes• Representing change

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen

Net changes – Gross changes

15

Time 0 Time 1

Forest

ForestClear-cut

Clear-cut

Net change: Nil (Still 50 % forest and 50 % clear cut)Gross change: 100 % (land cover has changed everywhere)

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen

Forest change – case study from Finland

1 2 and 1 3Same net changes (more built-up; less forest)Different gross changes

16

Forest reduction

Forest increase

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen

Mixed and scale dependent classesCLC 243 – Land principally occupied by agriculture

17

paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 18