Monitoring of Urban Growth Patterns in Rapidly Growing Bahir Dar City of Northwest Ethiopia with 30 year Landsat Imagery Record
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Data Used
2.2.1. Satellite Imagery
2.2.2. Other Datasets
2.3. Methodology
2.3.1. Image Segmentation and Classification
2.3.2. Accuracy Assessment
2.3.3. Change Detection Analysis
3. Results
3.1. LULC Classification
3.2. Classification Accuracy
3.3. Land Use/Land Cover (LULC) Changes
3.4. Expansion of Built-Up Area
4. Discussion
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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LULC Class | Description |
---|---|
Bare land | Areas with less than 10% vegetated cover during any time of the year, which are degraded due to erosion, intensive traditional cultivation of crops, or over grazing (including exposed stone, sand, and soil) [33]. |
Cropland | All areas designated for crop cultivation. During the dry season (October–May), some of the cropland turns into harvested land which is part of the cropland class by definition. |
Grassland | This is land dominated by grass cover. |
Built-up | All types of artificial surfaces including: residential and commercial areas, transportation networks, industrial areas, infrastructure, and all types of urban features. |
Natural forest | Deciduous forests which have a minimum land area of 0.5 ha with a tree canopy cover of more than 10%, which is not subject to agricultural or other specific non-forest land use [33]. |
Tree patches | A group of trees with an area smaller than 0.5 ha which includes bush and shrub lands. |
Wetland | Non-forested areas either partially, seasonally, or permanently waterlogged. The water may be stagnant or circulating [34]. |
Water | Lakes, rivers, ponds, and all kinds of water bodies. |
Parameters | 1985 (Landsat 5 TM) | 1995 (Landsat 5 TM) | 2008 (Landsat 5 TM) | 2015 (Landsat 8 OLI) | |||
---|---|---|---|---|---|---|---|
Level 1 | Level 2 | Level 1 | Level 2 | Level 1 | Level 2 | Level 1 | |
Scale | 20 | 10 | 15 | 10 | 15 | 10 | 100 |
Shape | 0.1 | 0.1 | 0.2 | 0.1 | 0.2 | 0.3 | 0.3 |
Compactness | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.7 |
Index/ Classifier | Year | Description |
---|---|---|
Urban index | 1985 (L5TM) | Observes the relationship between near infrared and mid infrared wavelengths to detect built-up areas. |
NN Classifier | 1995 (L5TM) | Sample selection based on:
|
2015 (L8 OLI) | Mean Blue values (Band 2) | |
EBBI | 2008 (L5TM) | Measures the contrast reflection range and absorption in built-up and bare land areas [39]. |
NDBaI | 2015 (L8 OLI) | Used to map bare land, based on the significant difference of spectral signature in the NIR between bare land and the other LULC classes [40]. |
Land Cover | 1985 | 1995 | 2008 | 2015 | ||||
---|---|---|---|---|---|---|---|---|
Area (ha) | % | Area (ha) | % | Area (ha) | % | Area (ha) | % | |
Bare land | 1213.11 | 3 | 1245.6 | 3.1 | 1468.125 | 3.7 | 1683.63 | 4.2 |
Cropland | 26361.81 | 66 | 27029.43 | 67.7 | 26641.44 | 66.7 | 24578.60 | 61.5 |
Grassland | 2385.72 | 6 | 2049.84 | 5.1 | 989.96 | 2.5 | 877.55 | 2.2 |
Built-up | 941.94 | 2.4 | 1029.83 | 2.6 | 2279.88 | 5.7 | 3301.79 | 8.3 |
Natural forest | 662.22 | 1.7 | 197.28 | 0.5 | 149.76 | 0.4 | 131.58 | 0.3 |
Tree patches | 2098.85 | 5.1 | 2266.25 | 5.7 | 2346.80 | 5.9 | 3082.01 | 7.7 |
Water | 4974.53 | 12.5 | 4887.27 | 12.2 | 4861.71 | 12.2 | 5116.46 | 12.8 |
Wetland | 1312.83 | 3.3 | 1245.51 | 3.1 | 1213.34 | 3.0 | 1179.41 | 3.0 |
1985 | 1995 | 2008 | 2015 | |||||
---|---|---|---|---|---|---|---|---|
Class Name | UA (%) | PA (%) | UA (%) | PA (%) | UA (%) | PA (%) | UA (%) | PA (%) |
Bare land | 93.5 | 93.5 | 87.1 | 87.1 | 97 | 94.1 | 76.9 | 76.9 |
Cropland | 93.3 | 94.9 | 90.2 | 94.9 | 92 | 95.8 | 85.5 | 92.2 |
Grassland | 78.4 | 96.7 | 93.1 | 87.1 | 87.5 | 93.3 | 96.4 | 93.1 |
Built-up | 97.1 | 97.1 | 92.6 | 92.6 | 93.5 | 96.7 | 94.7 | 89.4 |
Natural forest | 92.9 | 92.9 | 90.9 | 90.9 | 85.7 | 85.7 | 100 | 87.5 |
Tree patches | 97.7 | 89.4 | 90.7 | 84.8 | 90.3 | 90.3 | 78.7 | 87.3 |
Wetland | 92.9 | 86.7 | 91.9% | 97.1 | 96.4 | 90 | 88.9 | 78 |
Water | 100 | 90.5 | 100 | 97 | 100 | 96.7 | 100 | 90 |
Overall accuracy | 92.9 | 91.8 | 93.8 | 88.3 | ||||
Kappa statistic | 0.92 | 0.9 | 0.93 | 0.85 |
LULC Changes between Periods | ||||||||
---|---|---|---|---|---|---|---|---|
1985–1995 | 1995–2008 | 2008–2015 | 1985–2015 | |||||
LULC Class | Area (ha) | % | Area (ha) | % | Area (ha) | % | Area (ha) | % |
Bare land | 32.49 | 2.68 | 222.525 | 17.86 | 215.51 | 14.68 | 470.52 | 38.79 |
Cropland | 667.62 | 2.53 | –387.99 | –1.44 | –2062.85 | –7.74 | –1783.22 | –6.76 |
Grassland | –335.88 | –14.08 | –1059.885 | –51.71 | –112.41 | –11.36 | –1508.18 | –63.22 |
Built-up | 87.89 | 9.33 | 1250.055 | 121.39 | 1021.91 | 44.82 | 2359.85 | 250.53 |
Natural Forest | –464.94 | –70.21 | –47.52 | –24.09 | –18.18 | –12.14 | –530.64 | –80.13 |
Tree Patches | 167.4 | 7.98 | 80.55 | 3.55 | 735.21 | 31.33 | 983.16 | 46.84 |
Water | –87.255 | –1.75 | –25.56 | –0.52 | 254.75 | 5.24 | 141.93 | 2.85 |
Wetland | –67.32 | –5.13 | –32.175 | –2.58 | –33.93 | –2.80 | –133.43 | –10.16 |
From | Bare Land | Cropland | Grassland | Built-Up | Natural Forest | Tree Patches | Wetland | Water | TOTAL (2015)b |
---|---|---|---|---|---|---|---|---|---|
To | |||||||||
Bare land | 197.81 | 1260.68 | 90.37 | 15.34 | 7.44 | 103.07 | 2.66 | 6.25 | 1683.63 |
Cropland | 716.56 | 20,769.16 | 1313.34 | 127.14 | 106.04 | 1045.32 | 327.93 | 173.10 | 24,578.60 |
Grassland | 73.68 | 491.77 | 234.08 | 27.73 | 8.44 | 20.57 | 20.00 | 1.26 | 877.54 |
Built-up | 150.98 | 1886.15 | 284.48 | 687.52 | 2.24 | 229.27 | 39.97 | 21.18 | 3301.79 |
Natural forest | 0.00 | 0.00 | 0.00 | 0.62 | 102.34 | 1.74 | 3.72 | 23.16 | 131.58 |
Tree patches | 62.51 | 1544.89 | 185.07 | 66.75 | 278.84 | 618.04 | 221.74 | 104.17 | 3082.00 |
Wetland | 10.82 | 139.90 | 217.80 | 9.97 | 98.56 | 72.67 | 497.91 | 131.77 | 1179.40 |
Water | 0.74 | 269.26 | 60.58 | 6.88 | 58.31 | 8.16 | 198.90 | 4513.63 | 5116.45 |
TOTAL (1985)a | 1213.11 | 26361.81 | 2385.72 | 941.94 | 662.22 | 2098.85 | 1312.83 | 4974.52 | 39,951 |
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Kindu, M.; Angelova, D.; Schneider, T.; Döllerer, M.; Teketay, D.; Knoke, T. Monitoring of Urban Growth Patterns in Rapidly Growing Bahir Dar City of Northwest Ethiopia with 30 year Landsat Imagery Record. ISPRS Int. J. Geo-Inf. 2020, 9, 548. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi9090548
Kindu M, Angelova D, Schneider T, Döllerer M, Teketay D, Knoke T. Monitoring of Urban Growth Patterns in Rapidly Growing Bahir Dar City of Northwest Ethiopia with 30 year Landsat Imagery Record. ISPRS International Journal of Geo-Information. 2020; 9(9):548. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi9090548
Chicago/Turabian StyleKindu, Mengistie, Daniela Angelova, Thomas Schneider, Martin Döllerer, Demel Teketay, and Thomas Knoke. 2020. "Monitoring of Urban Growth Patterns in Rapidly Growing Bahir Dar City of Northwest Ethiopia with 30 year Landsat Imagery Record" ISPRS International Journal of Geo-Information 9, no. 9: 548. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi9090548