Journal of Geographical Sciences >
Urban forest loss using a GIS-based approach and instruments for integrated urban planning: A case study of João Pessoa, Brazil
Leandro I A Lacerda (1994-), specialized in architecture and urbanism |
Received date: 2020-11-08
Accepted date: 2021-03-10
Online published: 2021-12-25
Supported by
Brazilian Agency for the Improvement of Higher Education(Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES) - Fund Code 001;The National Council for Scientific and Technological Development, Brazil - CNPq(304213/2017-9)
The National Council for Scientific and Technological Development, Brazil - CNPq(304540/2017-0)
The Federal University of Paraíba
Urban forests play an important role in the thermal comfort and overall life of local populations in large- and medium-sized cities. This study analyzes urban forest loss and maps land use and land cover (LULC) changes between 1991 and 2018 by evaluating the use of urban planning instruments for the mitigation of urban forest loss in João Pessoa, Brazil. For this purpose, satellite-derived LULC images from 1991, 2006, 2010 and 2018 and data on urban forest loss areas obtained using the Google Earth Engine were used. In addition, this paper also discusses the instruments used for integrated urban planning, which are (a) the legal sector, responsibility and nature; (b) the urban expansion process; and (c) the elements of urban infrastructure. The results show a clear shift in land use in the study area. The major changes in LULC classes occurred in urban areas and herbaceous vegetation, while the greatest loss was in arboreal/shrub vegetation. Thus, an increase in the pressure to occupy zones intended for environmental preservation could be estimated. Our results showed similar accuracies with other studies and more spatial details. The characteristics of the patterns, traces, and hotspots of urban expansion and forest cover loss were explored. We highlighted the potential use of this proposed framework to be applied and validated in other parts of the world to help better understand and quantify various aspects of urban-related problems such as urban forest loss mapping using instruments for integrated urban planning and low-cost approaches.
Leandro Ismael de Azevedo LACERDA , José Augusto Ribeiro da SILVEIRA , Celso Augusto Guimarães SANTOS , Richarde Marques da SILVA , Alexandro Medeiros SILVA , Thiago Victor Medeiros do NASCIMENTO , Edson Leite RIBEIRO , Paulo Vitor Nascimento de FREITAS . Urban forest loss using a GIS-based approach and instruments for integrated urban planning: A case study of João Pessoa, Brazil[J]. Journal of Geographical Sciences, 2021 , 31(10) : 1529 -1552 . DOI: 10.1007/s11442-021-1910-4
Figure 1 Data processing and classification methodology flowchart |
Figure 2 Location of (a) João Pessoa County in (b) Paraíba State, (c) Brazil |
Table 1 Characteristics of the images used in this study |
Satellite | Dates | Sun elevation (°) | Sun azimuth (°) | Cloud cover (%) | |||
---|---|---|---|---|---|---|---|
Quadrants | |||||||
Q1 | Q2 | Q3 | Q4 | ||||
Landsat 5 | 11/05/1991 | 57.2287 | 107.413 | 80 | 40 | 80 | 80 |
Landsat 5 | 08/26/2006 | 55.6194 | 59.2117 | 70 | 80 | 70 | 70 |
Landsat 5 | 10/08/2010 | 63.2127 | 88.4564 | 90 | 30 | 80 | 40 |
Landsat 8 | 09/28/2018 | 62.2825 | 78.4343 | 30 | 40 | 35 | 30 |
Figure 3 Infographic showing the applied method (thematic and dimensional synthesis) |
Table 2 Average accuracy obtained for the classifications |
LULC | User’s accuracy | Producer’s accuracy | Kappa | Commission | Omission | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
% | ||||||||||||||||||||
1991 | 2006 | 2010 | 2018 | 1991 | 2006 | 2010 | 2018 | 1991 | 2006 | 2010 | 2018 | 1991 | 2006 | 2010 | 2018 | 1991 | 2006 | 2010 | 2018 | |
WB | 82 | 81 | 80 | 80 | 83 | 81 | 84 | 82 | 83 | 85 | 86 | 85 | 87 | 88 | 88 | 89 | 82 | 84 | 83 | 85 |
ES | 72 | 74 | 75 | 76 | 84 | 86 | 85 | 83 | 77 | 79 | 79 | 84 | 87 | 89 | 88 | 90 | 80 | 81 | 80 | 80 |
BA | 90 | 91 | 90 | 90 | 83 | 82 | 82 | 82 | 82 | 82 | 82 | 82 | 89 | 88 | 87 | 88 | 83 | 81 | 85 | 85 |
ASB | 85 | 86 | 90 | 89 | 85 | 85 | 86 | 84 | 78 | 79 | 78 | 77 | 87 | 87 | 89 | 89 | 71 | 69 | 72 | 72 |
HV | 86 | 87 | 87 | 87 | 82 | 79 | 83 | 82 | 82 | 81 | 82 | 83 | 89 | 87 | 89 | 88 | 80 | 82 | 80 | 79 |
WB=water bodies, ES=exposed soil, BA=built-up area, ASB=arboreal/shrub vegetation, HV=herbaceous vegetation. |
Table 3 Area in km² and percentage of LULC in João Pessoa |
LULC | 1991 | 2006 | 2010 | 2018 | ||||
---|---|---|---|---|---|---|---|---|
km² | % | km² | % | km² | % | km² | % | |
Water bodies | 2.6 | 1.3 | 2.8 | 1.4 | 3.0 | 1.5 | 2.0 | 1 |
Exposed soil | 8.8 | 4.4 | 5.3 | 2.6 | 7.0 | 3.5 | 1.0 | 0.5 |
Built-up area | 80.1 | 40.0 | 82.6 | 41.3 | 90.0 | 45.0 | 96.0 | 48 |
Arboreal/shrub vegetation | 24.4 | 12.2 | 33.9 | 16.9 | 35.0 | 17.5 | 50.0 | 25 |
Herbaceous vegetation | 84.1 | 42.1 | 75.4 | 37.8 | 65.0 | 32.5 | 52.0 | 26 |
Figure 4 LULC in João Pessoa on (a) 11/5/1991, (b) 8/26/2006, (c) 10/8/2010, and (d) 9/28/2018 |
Figure 5 Forest cover loss in João Pessoa (2001-2018) |
Figure 6 Accumulated tree cover loss maps (2001-2018) for João Pessoa city |
Figure 7 Total loss, gain, and gain-loss of tree cover between 2000 and 2012 |
Figure 8 Analytical summary of thematic synthesis: Theme I - Legal sector, responsibility and nature (scenarios and conflicts vs. potential solutions) |
Figure 9 Analytical summary of thematic synthesis: Theme II - Urban expansion process (scenarios and conflicts vs. potential solutions) |
Figure 10 Analytical summary of thematic synthesis: Theme III - Elements of urban infrastructure (scenarios and conflicts vs. potential solutions) |
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