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SPATIO-TEMPORAL URBAN CHANGE DETECTION, ANALYSIS AND PREDICTION OF KATHMANDU VALLEY
1. SPATIO-TEMPORAL URBAN CHANGE
EXTRACTION AND MODELING OF
KATHMANDU VALLEY
SUPERVISORS :
Asst. Prof. Nawaraj Shrestha
Er. Uma Shanker Panday
8/3/2014 Department of Civil and Geomatics Engineering 1
PROJECT MEMBERS:
Dhruba Poudel
Janak Parajuli
Kamal Shahi
2. CONTENTS
1. INTRODUCTION
2. OBJECTIVES
3. SCOPE OF PROJECT
4. METHODOLOGY
5. OUTCOMES
6. LIMITATIONS AND RECOMMENDATIONS
7. CONCLUSION
8/3/2014 Department of Civil and Geomatics Engineering 2
3. 1. INTRODUCTION
Spatial extension of the cities in temporal dimension
Continuous process all over the world BUT showing more effects on developing
countries
Universal socio-economic phenomenon occurring world wide, Nepal not an
exception
urban system is considered as the complex system having characteristics of:
• Non-determinism and tractability
• Limited functional decomposability
• Distributed nature of information and representation
• Emergence and self-organization
8/3/2014 Department of Civil and Geomatics Engineering 3
URBANIZATION
4. BACKGROUND
Half of the world's population would live in urban areas by the end of 2008
(UNFPA 2007)
By 2050, 64.1% and 85.9% of the developing and developed world respectively
will be urbanized (UNFPA 2007)
Hence urbanization is skyrocketing
8/3/2014 Department of Civil and Geomatics Engineering 4
5. 8/3/2014 Department of Civil and Geomatics Engineering 5
Figure 1.Nepal as fast growing urban area (Source: - UN-HABITAT Global Observatory)
6. 8/3/2014 Department of Civil and Geomatics Engineering 6
Fig 2. (A) and (B) Urban growth around Bouddhanath Area
(A) Is 1967 satellite image from CORONA
(B) Is 2001 IKINOS satellite image
Source: HABITAT INTERNATIONAL(www.elsevier.com/locate/habitatint)
7. PROBLEM STATEMENT
Kathmandu among fastest growing city in the world.
Limited information on city growth and urbanization patterns.
Limited quantitative information on urban growth rate and direction
Need of informed decision making tool based on which future
strategic plan and action can be made to counterpart fast urban growth.
8/3/2014 Department of Civil and Geomatics Engineering 7
8. 2. OBJECTIVES
To detect, analyze and visualize the extent of spatial-temporal urban
growth based on multi-temporal Landsat Satellite imagery.
To quantify the spatial-temporal pattern of urban growth and
landscape fragmentation using spatial metrics.
To simulate or forecast the urban growth of the study area using
SLEUTH model.
8/3/2014 Department of Civil and Geomatics Engineering 8
9. 3. SCOPE OF PROJECT
This research is attempted in order to:
Extract the urban area of the Kathmandu valley over different time scales,
Quantify that urban extent,
Analyze the changeover difference time periods and
Predict the future scenario of the urbanization considering the factors affecting the urban
growth
Using following applications:
Remote sensing
Geographic Information system (GIS)
FRAGSTATS to calculate Spatial metrics
SLEUTH model using Cellular Automata (CA) as UGPM
8/3/2014 Department of Civil and Geomatics Engineering 9
10. 4. METHODOLOGY
8/3/2014 Department of Civil and Geomatics Engineering 10
Kathmandu is the capital city of Nepal and also one of the fastest growing cities of Asia.
This valley is bounded approximately within 27° 32' 00" N to 27° 49'16" N and longitude
85°13'28" E to 85°31'53" E (UTM coordinate system) covering the area of approximately 58 sq.
km.
The population of valley is more than 2.5 million and has population density of 129,250 per sq.
km
a. Project Area
Figure 3. Project Site(Thapa & Muriyama, 2010)
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S.N. Sensor Date of
Acquisition
Resolution Source WRS Sun Elevation
(degrees)
Sun Azimuth
(degrees)
1 Landsat 5 1989-10-31 30*30 USGS website 141/04100 41 144
2 Landsat 7 1999-11-04 30*30 USGS website 141/041 42.98952434 152.67113676
3 Landsat 5 2009-11-23 30*30 USGS website 141/041 37.81527226 154.04128335
4 Landsat 8 2014-03-26 30*30 USGS website 141/041 55.95689863 133.41063203
a. Landsat TM
b. Data Used
12. 8/3/2014 Department of Civil and Geomatics Engineering 12
S.N. Data Layers Year Projection System Website
1 Contour - WGS 1984 geoportal.icimod.org, accessed on 2014-06-15
2 Landuse 1978 & 1995 WGS 1984 geoportal.icimod.org, accessed on 2014-06-15
3 River - WGS 1984 geoportal.icimod.org accessed on 2014-06-15
4 Road 2010 WGS 1984 geoportal.icimod.org, accessed on 2014-06-15
5 Spot height - WGS 1984 geoportal.icimod.org, accessed on 2014-06-15
6 Kathmandu
Boundary
- WGS 1984 geoportal.icimod.org, accessed on 2014-06-15
b. Geographic Data layers
13. S.N. Software Use in the Project
1 ENVI Used for image pre-processing, index-based image processing, supervised classification, accuracy
assessment and confusion matrix calculation, image differencing
2 ESRI’s ArcGIS To prepare data for spatial metrics, store classified data, visualize them and prepare map
Accuracy assessment using GCPs
Used to prepare raster data for SLEUTH
Process model output
3 FRAGSTATS To quantify the landscape pattern
4 Map Source Create and view waypoints along routes and tracks
To deal with gpx format file
Accuracy assessment of classified binary map
5 SLEUTH model To predict future urban growth
6 PC-Pine Edit scenario files to execute SLEUTH model
7 Cygwin Used as Linux emulator to run SLEUTH model
8 Others Expert GPS, Google Earth, GPS Visualizer used for various purposes.
Photoshop and Paint used to create gray scale 8 bit image in GIF format
13
d. Software and instruments Used
8/3/2014 Department of Civil and Geomatics Engineering
14. e. Overall Work Flow
8/3/2014 Department of Civil and Geomatics Engineering 14
Figure 4. Work Flow
Image preprocessing
Landsat Image
Accuracy Assessment
Signature Extraction
Image Classification
Classified Map
No
Yes
ReferenceData
Multi-temporal
growth maps
Quantify landscape
Pattern
Analyze and forecast
Urban growth
Spatial metrics SLEUTH Modeling
Multi-temporal
Classified
Map
Final outcomes
1989
2014
2009
1999
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METHODOLOGICAL:WORK
FLOW
1. RS IMAGE CLASSIFICATION
AND ANALYSIS
2. QUANTIFY URBAN GROWTH
PATTERN USING SPATIAL
METRICS
3.CHANGE DETECTION
4. PREDICTING URBAN
GROWTH PATTERN USING
SLEUTH MODELING
1. RS IMAGE CLASSIFICATION
1.1 Landsat TM Image acquisition
1.2 Image Preprocessing
Image calibration
Atmospheric Correction
Topographic Correction
1.3 Index images generation
Normalized Difference Built-up Index:
NDBI=(MIR-NIR)/(MIR+NIR)
Soil Adjusted Vegetation Index:
SAVI=(NIR-Red)(1+L)/(NIR+Red+L)
L is constant 1>L>0
Modified Normalized Difference Water Index:
MNDWI=(Green-MIR)/(Green+MIR)
Index based Built-up Index(IBI)
IBI=[NDBI-(SAVI+MNDWI)/2]/[NDBI+(SAVI-
MNDWI)/2]
Click here to see sample index images
1. RS IMAGE CLASSIFICATION
contd…
1.4 Signature Extraction via Region of Interest
Built-up ROIs
Non-Built up ROIs
1.5 Supervised Image Classification
using maximum Likelihood Algorithm
Classified into two classes i.e. Built and Non-Built
1.6 Accuracy Assessment
Confusion Matrix
i. Using Ground Truth ROIs in ENVI
ii. Using GPS sample points in GIS
Visual Interpretation
i. Google earth Overlay
ii. Openstreet map Overlay
iii. Combined Overlay with GPS sample
points
1.7 Multi-Temporal Image analysis
16. 2. QUANTIFY URBAN GROWTH
PATTERN
Spatial metrics is used to quantify the dynamic
patterns of landscape so will be used to quantify the
urban growth
Fragstats software was used
Three categories of metrics were calculated
Patch metrics
Class metrics
Landscape metrics
Nine types of parameters were calculated
i. Class Area(CA) vi. Edge density(ED)
ii. Number of patches(NP) vii. Cotagion(CONTAG)
iii. Patch density(PD) viii. Shannon’s Diversity
Index(SHDI)
iv. Largest Patch Index(LPI) ix. Shannon’s Eveness
Index(SEVI)
v. Area Weighted Mean Patch
Fractal dimension (AWMPFD)
8/3/2014 Department of Civil and Geomatics Engineering 16
METHODOLOGICAL:WORK
FLOW
1. RS IMAGE CLASSIFICATION
AND ANALYSIS
2. QUANTIFY URBAN GROWTH
PATTERN USING SPATIAL
METRICS
3.CHANGE DETECTION
4. PREDICTING URBAN
GROWTH PATTERN USING
SLEUTH MODELING
1999
2009
1989
2014
17. 3.CHANGE DETECTION
2.1 Image differencing of multi-temporal
classified image
2.2 Post classification comparison in GIS
8/3/2014 Department of Civil and Geomatics Engineering 17
METHODOLOGICAL:WORK
FLOW
1. RS IMAGE CLASSIFICATION
AND ANALYSIS
2. QUANTIFY URBAN GROWTH
PATTERN USING SPATIAL
METRICS
3.CHANGE DETECTION
4. PREDICTING URBAN
GROWTH PATTERN USING
SLEUTH MODELING
18. 4. PREDICTING URBAN GROWTH PATTERN
USING SLEUTH MODELING
SLEUTH Stands for Slope, land use, exclusion,
urban extent, transportation and hill shade and
consist of urban modeling module and land cover
change transition model
Click here to see model inputs
Uses five controlling coefficients of growth to
simulate the change
i. Dispersion : simulates spontaneous growth
ii. Breed: simulates new spreading center
iii. Spread : simulates edge growth
iv. Road Gravity : simulates road influenced growth
v. Slope : determines the effect of slope on the
probability of pixel being urbanized
Model validation
8/3/2014 Department of Civil and Geomatics Engineering 18
METHODOLOGICAL:WORK
FLOW
1. RS IMAGE CLASSIFICATION
AND ANALYSIS
2. QUANTIFY URBAN GROWTH
PATTERN USING SPATIAL
METRICS
3.CHANGE DETECTION
4. PREDICTING URBAN
GROWTH PATTERN USING
SLEUTH MODELING
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Analyzing Multi-Temporal Image with respect to present road NetworkURBAN MAP 1989
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1.Confusion Matrix
Calculated via two methods:
Providing Region of Interests(ROI) of classified image classes in ENVI
Using Arc GIS’s combine and pivot table tools using input Ground control Points(GCP)
of classified image area and classified image of that date.
Results from confusion matrix:
Year Kappa Coefficient Overall Accuracy
(ROI methodI) (GCP method) ROI method GCP method
1989 0.89 0.87 90.02% 89.28%
1999 0.85 0.84 87.11% 85.61%
2009 0.88 0.86 89.87% 87.48%
2014 0.91 0.89 93.21% 89.77%
b. Accuracy Assessments
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2. Visual Interpretation
i. Google earth Overlay
ii. Openstreet Map Overlay
24. Year CA NP PD LPI ED LSI
Non-
Built Built
Non-
built Built
Non-
Built Built
Non-
Built Built
Non-
Built Built
Non-
Built Built
1989 57411.36 873.99 52 1606 0.0892 2.7554 98.4721 0.3181 11.5943 8.8128 7.0482 43.2374
1999 56159.64 2125.71 140 3417 0.2402 5.8625 96.2464 0.8488 23.3956 20.6244 14.3842 65.0487
2009 52905.42 5379.93 1118 3735 1.9181 6.4081 88.8658 6.5222 37.582 34.8108 23.7992 69.1534
2014 49025.61 9259.74 2694 6735 4.6221 11.5552 81.3187 11.4145 66.6682 63.9392 43.8477 96.7477
8/3/2014 Department of Civil and Geomatics Engineering 24
1. CLASS METRICS
c. Quantification of Classified Image
Increase in urban class area(CA) from 1989-2014 with increase in number of patches(NP)
Increased number of patches indicating landscape fragmentation
Fragmentation is high relative to the urban growth resulting increase in patch density(PD)
Largest patch index, edge density are also in continuous trend of increasing for built-up class
CAN ANAALYZED FURTHER WITH THE HELP OF FOLLOWING GRAPHS:
26. 2 . L A N D S C A P E M E T R I C S
8/3/2014 Department of Civil and Geomatics Engineering 26
Year TA NP PD LPI ED LSI FRAC_AM
CONTA
G PR PRD SHDI SHEI
1989 58285.35 1658 2.8446 98.4721 11.6046 7.0019 1.1913 90.778 2 0.0034 0.0779 0.1123
1999 58285.35 3557 6.1027 96.2464 23.411 14.1255 1.2586 81.1899 2 0.0034 0.1566 0.2259
2009 58285.35 4853 8.3263 88.8658 37.5974 22.6851 1.2921 65.2776 2 0.0034 0.3078 0.4441
2014 58285.35 9429 16.1773 81.3187 66.7048 40.2475 1.3455 48.1171 2 0.0034 0.4378 0.6316
Besides the metrics discussed above, FRAC_AM, CONTAG, SHDI, SHEI descries the complexity
of the patches
Which all are increasing for built up class, increasing the complexity of the landscape patches
31. 8/3/2014 Department of Civil and Geomatics Engineering 31
0
100
200
300
400
500
600
700
800
1989-1999 1999-2009 2009-2014
125.172
325.422
775.962
Change Area(Ha/year)
1989-1999
1999-2009
2009-2014
1989-1999 1999-2009 2009-2014
growth rate 2.14 5.58 13.33
0
2
4
6
8
10
12
14
Growthrate(%)
growth rate
Growth rate is increasing in very high rate
Growth trend suggests that it will further increase for some decades
Present growth rate is sufficient to double the urban area of valley in less than 15 years
Migration, population growth, transportation development and many other new projects
on valley tends to increase more urban growth rate
32. 8/3/2014 Department of Civil and Geomatics Engineering 32
e. SLEUTH Modeling Click here for animation
1. Comparative probability map
33.
34. Figure 1 shows the dominance of growth coefficients over different time period and
fluctuation in the coefficients
Fluctuation is due to self modification functionality of model
Figure 2 suggests the rapid growth up to 2022 and decrease in growth rate
8/3/2014 Department of Civil and Geomatics Engineering 34
2. Comparative analysis of coefficients of model and probable urban area
35. 8/3/2014 Department of Civil and Geomatics Engineering
35
3. Coefficient based probability map
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Types of Growth Patterns in the valley
1. Spontaneous Growth2. New Spreading Centre3. Edge growth4. Road Influenced Growth
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Types of Growth observed
Infill Development
40. 8/3/2014 Department of Civil and Geomatics Engineering 40
a. Limitations
Image classification is binary classification to built-up and non-built up only (not land use
mapping)
Quantification is based on the binary classified map so spatial metrics are calculated on the
basis of only those landscape class
Change detection is overall class based but not patch oriented
Prediction of model is totally based on the factors supported by SLEUTH model
Political condition, socio-economic and demographic factors lacks even they are the major
factors of urban growth)
6.LIMITATIONS AND RECOMMENDATION
41. Use of high resolution image enhances better extraction of built-ups
Land use classifications of landscape may be more informative than binary classification
Patch based analysis could have detect the process urban growth trend precisely
OSM over leesalee metrics could make made model more robust
SLEUTH-3r would have counter the some of the limitations of SLEUTH model
8/3/2014 Department of Civil and Geomatics Engineering 41
b. Recommendation
42. 7. CONCLUSIONS
Index based Supervised classification of Landsat TM images can be used for
built-up extraction
Urban Growth rate of Kathmandu is skyrocketing (from 2.14%-13.315 during
1989-2014)
Spatial metrics can be used for quantification of landscape to analyze the trend
of urban growth rate and pattern
Probability map of SLEUTH model is suitable for Regional level of planning
and policy formulation.
8/3/2014 Department of Civil and Geomatics Engineering 42
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Only the matter is “HOW it comes???”
It is on the topic of background to show the nepal’s status on the urban growth
It is also on background to show the Kathmandu as the fastest growing urbanization in the fast urban growing country
Urbanization not a problem..coz its continious process and natural process of human development
But when its become unmanaged….its the problem
To manage the urbanization city planners needs uptodate and empirical data
SO LACK OF SUCH DATA ,METHODOLOGY,KNOWLEDGE OF DRIVING FORCES is the main problem statement of our project
Three major objectives addressing each of the problem statement