Spatial Correlograms And Landscape Metrics
As Indicators Of Land Use Changes
Author(s)
R. Aunap, E. Uuemaa, J. Roosaare & Ü. Mander
Abstract
Land use changes over time can be analysed in several ways. We studied the
spatial autocorrelation (Moran’s I) of raster format land use maps from three
different time periods (1900, 1940, and 2000) in 13 study areas representing
most of the landscape regions in Estonia. Human influence was taken into
consideration in compiling a scale of the contrast between 10 land use groups.
We introduce a simple characteristic based on spatial correlograms: a half-value
distance lag, hI=0.5 – a distance where Moran’s I drops below 0.5. No significant
change was detected in values of hI=0.5 over time. In addition, we did not detect a
difference between lowlands and heights. In analysis of landscape metrics Edge
Density (ED), Patch Density (PD), Contrast Weighted Edge Density (CWED),
Mean Patch Area Distribution (AREA_MN), and Percentage of Like
Adjacencies (PLADJ) showed significant changes comparing the year 2000 with
1900 and 1940. However, the results showed no significant change in landscape
metrics between 1900 and 1940. ED, PD and CWED had higher values in 2000
than in 1900 and 1940. Therefore landscape heterogeneity has increased in recent
decades. ED, PD, CWED, AREA_MN and PLADJ metrics also indicated a
significant difference between lowlands and heights. It appeared that heights
have a more heterogeneous landscape structure than lowlands. Generally, the
heterogeneity of Estonia’s landscapes overall has changed within recent decades.
Keywords: FRAGSTATS metrics, landscape pattern, landscape regions, land use
change, Moran’s I, spatial autocorrelation.
1 Introduction
Studies on land use changes is the basic area in landscape research [1, 2] being
one of the key issues in global environmental change [3]. Both natural and socio-
Keywords
FRAGSTATS metrics, landscape pattern, landscape regions, land usechange, Moran’s I, spatial autocorrelation.
Related Book
Other papers in this volume
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