1) This study analyzed the quantity and connectivity of green spaces on private lands in the Osaka metropolitan region of Japan using satellite imagery and GIS data on land use and zoning districts. 2) The results showed that over 50% of green spaces are part of large patches over 10 hectares or very small patches under 0.1 hectares. The ratio and connectivity of green spaces varied significantly based on the slope and zoning district of the land. 3) Residential zoning districts generally had higher green coverage but more fragmented connectivity, while lands with steeper slopes in suburban areas tended to have higher green coverage ratios. Differences in green space distribution were also observed between zoning districts located in the same slope category.

1. 0
5
10
15
20
25
30
35
40
45
category
1
low
rise-rise
category
2
low-rise
category
1
medium-to-high-rise
category
2
medium-to-high-rise
category
1
residential
districts
category
2
residential
districts
quasi-residential
districts
neighborhood
commercial
districts
commercial
districts
quasi-industrial
districts
industrial
districts
exclusive
industrial
districts
the
mean
of
green
cover
rate(%)
less than 3 degrees
3-5 degrees
5-7 degrees
7-10degrees
10-15degrees
0% 50% 100%
category 1 low rise-rise
category 2 low-rise
category 1 medium-to-high-rise
category 2 medium-to-high-rise
category 1 residential
category 2 residential
quasi-residential districts
neighborhood commercial
commercial districts
quasi-industrial districts
industrial districts
exclusive industrial districts -0.1ha
0.1-0.25ha
0.25-0.5ha
0.5-1.0ha
1-10ha
10-100ha
100ha-
without
green cover
1) most of green spaces in this area are a part of large green patches (10ha<) or quite small green patches (0.1ha>)
2) The ratio and connectivity of green cover have been significantly affected by slope gradient
3) Differences between the types of zoning district seem to be linked with the distribution pattern of green spaces influenced by the landform
How do quantity and connectivity of urban green spaces on private lands differ between types of zoning districts and types of natural land
conditions in the Osaka Metropolitan region?
Problem statement
Green spaces in urban areas, especially on private lands, have been decreased because of urban development/redevelopment.
Green spaces in highly urbanized area are too small and fragmented to support biodiversity currently.
Vacant lands are emerging toward near future under depopulation possibly.
Department of Environmental Systems Wakayama University
Yuki H. SAMPEI & Yuji HARA
Assessing the quantity and connectivity of urban green spaces
on private lands in the Osaka metropolitan region, Japan
Results
Satellite image
ALOS・AVNIR-Ⅱ
in Apr. and May 2011
Green cover data
Zoning district
boundary data
In 2011
Land use data
In 2008
Private lands
per zoning type
10mDEM
Slope data
Green connectivity
1)
green cover ratio/ green connectivity
in each type of zoning district
2)
green cover ratio/ green connectivity
in each slope category
Reorganization of these fragmented current/future private green spaces is required.
0
10
20
30
40
50
60
70
80
0
500
1000
1500
2000
2500
3000
3500
(
%
)
(ha)
total area of
green cover
green cover
ratio
0% 20% 40% 60% 80% 100%
less than 3 degrees
3-5degrees
5-7degrees
7-10degrees
10-15degrees
15-30degrees
over 30degrees
-0.1ha
0.1-0.25ha
0.25-0.5ha
0.5-1.0ha
1-10ha
10-100ha
100ha-
Key findings
Fig. total area and ratio of green cover
in each slope category
Fig. the size of green cover
in each slope category
Ways forward
Methods
2) green cover ratio/ green connectivity in each slope category
1) green cover ratio/ green connectivity in each type of zoning district
Fig. Distribution pattern and size of green cover
in the study area
Fig. Green cover ratio
in each zoning district
11%
7%
5%
6%
18%
12%
41%
less than 0.1ha
0.1-0.25ha
0.25-0.5ha
0.5-1.0ha
1-10ha
10-100ha
over 100ha
0% 50% 100%
category 1 low rise-rise
category 2 low-rise
category 1 medium-to-high-rise
category 2 medium-to-high-rise
category 1 residential
category 2 residential
quasi-residential districts
neighborhood commercial
commercial districts
quasi-industrial districts
industrial districts
exclusive industrial districts
0%
0-3%
3-5%
5-10%
10-20%
over 20%
Fig. Composition ratios of green
cover ratio category in each
zoning district type
Fig. Size of green patches
in each zoning district type
Fig. Means of green cover rate of each slope category
in each use district type
- Over 50% of green cover in this area are a part od large green patches (10ha<)
- Zoning districts located on the suburban area with steeper slopes, have relatively high
rate of green cover.
- Rate of green cover of residential zoning district are relatively high, but green connectivity
is fragmented except Category 1 low-rise exclusive residential districts.
- Differences between
the types of zoning
district could be
observed in same
slope category
This study has, so far, assessed and visualized the quality quantity and connectivity of urban green spaces on private lands. We will also examine the its
quality on the next step. We also need to give a consideration to the implementation of zoning regulation by local government and its impacts on green cover
Fig. Distribution pattern of zoning district types
Fig. Altitude of study area
- On the lands with the gradient of less than 3 degrees, total amount of green
cover is the largest, but the ratio/connectivity of green cover is low.
- The ratio and connectivity of green cover have been significantly affected by
slope gradient.
yuki_sampei@07.alumni.u-tokyo.ac.jp