Multidimensional impact of urban form on urban planning has received extensive attention. However, with the increasing phenomenon of urban slope expansion, there is still a lack of research on the impact of slope construction (SC) on urban form. Based on 97 cities in China with obvious SC, this paper selects 12 urban form indicators from five aspects: shape, boundary, void, area, and distance to explore the impact characteristics of SC on urban form. The results show that SC has a significant (P < 0.001) impact on the changes of 11 urban form indicators, and the degree of impact is significantly linearly correlated with the slope construction rate (SCR) (P < 0.001). In addition, the SC has basically the same impact on the shape of large and small urban patches, but the impact on large patches is significantly greater than that on small patches. In general, the SC tends to complicate the shape of urban patches, increase the number of voids inside the patches, concentrate the area distribution of patches on the largest patches, and reduce the distance between patches. The study provides a basic reference for the sustainable spatial planning in complex terrain areas from a morphological perspective.
AnselinLBeraAFloraxR, et al. (1996) Simple diagnostic tests for spatial dependence. Regional Science and Urban Economics26(1): 77–104. https://doi.org/10.1016/0166-0462(95)02111-6
4.
BadachJWojnowskiWGębickiJ (2023) Spatial aspects of urban air quality management: estimating the impact of micro-scale urban form on pollution dispersion. Computers, Environment and Urban Systems99: 101890. https://doi.org/10.1016/j.compenvurbsys.2022.101890
5.
BardhanRKurisuKHanakiK (2015) Does compact urban forms relate to good quality of life in high density cities of India? Case of Kolkata. Cities48: 55–65. https://doi.org/10.1016/j.cities.2015.06.005
6.
BerrillPNachtigallFJavaidA, et al. (2024) Comparing urban form influences on travel distance, car ownership, and mode choice. Transportation Research Part D: Transport and Environment128: 104087. https://doi.org/10.1016/j.trd.2024.104087
7.
BibriSKrogstieJKärrholmM (2020) Compact city planning and development: emerging practices and strategies for achieving the goals of sustainability. Developments in the Built Environment4: 100021. https://doi.org/10.1016/j.dibe.2020.100021
ChakrabortySMaityIDadashpoorH, et al. (2022) Building in or out? Examining urban expansion patterns and land use efficiency across the global sample of 466 cities with million+ inhabitants. Habitat International120: 102503. https://doi.org/10.1016/j.habitatint.2021.102503
10.
ChenJKinoshitaTLiH, et al. (2023) Toward green equity: an extensive study on urban form and green space equity for shrinking cities. Sustainable Cities and Society90: 104395. https://doi.org/10.1016/j.scs.2023.104395
11.
ChengCXingZYeL, et al. (2024) Characteristics and influencing factors of landscape pattern gradient transformation of small-scale agroforestry patches in Mountain cities. Sustainability16(15): 6322. https://doi.org/10.3390/su16156322
12.
DuttaDRahmanAPaulS, et al. (2020) Estimating urban growth in peri-urban areas and its interrelationships with built-up density using Earth observation datasets. The Annals of Regional Science65: 67–82. https://doi.org/10.1007/s00168-020-00974-8
13.
FlorczykAJMelchiorriMCorbaneC, et al. (2019) Description of the GHS Urban Centre Database 2015. Publications Office of the European Union.
GongPLiXWangJ, et al. (2020) Annual maps of global artificial impervious area (Gaia) between 1985 and 2018. Remote Sensing of Environment236: 111510. https://doi.org/10.1016/j.rse.2019.111510
16.
HaalandCvan Den BoschC (2015) Challenges and strategies for urban green-space planning in cities undergoing densification: a review. Urban Forestry and Urban Greening14(4): 760–771. https://doi.org/10.1016/j.ufug.2015.07.009
17.
HallerABrancaD (2023) Urbanization and the verticality of rural–urban linkages in Mountains. In: Montology. Springer, pp. 133–148.
18.
HanTDuCXieY, et al. (2025) A 3d perspective for understanding the mechanisms of urban heat island and urban morphology using multi-modal geospatial data and interpretable machine learning. Building and Environment282: 113184. https://doi.org/10.1016/j.buildenv.2025.113184
19.
HuangPPengQDuanJ, et al. (2023) Monitoring and early warning construction land slope classification method and its application. China Land Science37(6): 84–95. https://doi.org/10.11994/zgtdkx.20230620.093356
20.
JiangYZhouLWangB, et al. (2024) The impact of gradient expansion of urban–rural construction land on landscape fragmentation in typical Mountain cities, China. International Journal of Digital Earth17(1): 2310093. https://doi.org/10.1080/17538947.2024.2310093
21.
LiXZhangLLiangC (2010) A gis-based buffer gradient analysis on spatiotemporal dynamics of urban expansion in shanghai and its major satellite cities. Procedia Environmental Sciences2: 1139–1156. https://doi.org/10.1016/j.proenv.2010.10.123
22.
LiPQianHWuJ (2014) Environment: accelerate research on land creation. Nature510(7503): 29–31. https://doi.org/10.1038/510029a
23.
LiXGongPZhouY, et al. (2020) Mapping global urban boundaries from the global artificial impervious area (gaia) data. Environmental Research Letters15(9): 94044. https://doi.org/10.1088/1748-9326/ab9be3
24.
LuJPengQSongY, et al. (2024) Characteristics and effects of global sloping land urbanization from 2000 to 2020. Science of the Total Environment937: 173348. https://doi.org/10.1016/j.scitotenv.2024.173348
25.
MaJPengQMaS, et al. (2022) Slope ratio of urban construction land in China and its relationship with ground slope ratio. Resource Development & Marke38(8): 948–954. https://doi.org/10.3969/j.issn.1005-8141.2022.08.007
OsamaNShaoZFreeshahM (2023) The fabdem outperforms the global dems in representing bare terrain heights. Photogrammetric Engineering & Remote Sensing89(10): 613–624. https://doi.org/10.14358/PERS.23-00026R2
29.
PapachristouIRosas-CasalsM (2019) Cities and quality of life. Quantitative modeling of the emergence of the happiness field in urban studies. Cities88: 191–208. https://doi.org/10.1016/j.cities.2018.10.012
30.
PengQDengQMaS, et al. (2022a) The characteristics of the slope of construction land in the main urban area of chongqing and its circle characteristics. Shanghai Land & Resources43(1): 12-16,22. https://doi.org/10.3969/j.issn.2095-1329.2022.01.003
31.
PengQMaSDengQ, et al. (2022b) Slope gradient effect of urban construction land growth in mountainous areas——taking Guiyang as an example. Journal of Natural Resources37(7): 1865–1875. Available at: https://doi.org/10.31497/zrzyxb.20220714
32.
PengQTangLChenJ, et al. (2018) Study on the evolution of construction land slope spectrum in shenzhen from 2000 to 2015. Journal of Natural Resources33(12): 2200–2212. Available at: https://doi.org/10.31497/zrzyxb.20171159.
33.
QiangWWenTLuoH, et al. (2024) Does a more compact urban center layout matter in reducing household carbon emissions? Evidence from Chinese cities. Land Use Policy146: 107320. https://doi.org/10.1016/j.landusepol.2024.107320
34.
ShiKLiuGZhouL, et al. (2023a) Satellite remote sensing data reveal increased slope climbing of urban land expansion worldwide. Landscape and Urban Planning235: 104755. Available at: https://doi.org/10.1016/j.landurbplan.2023.104755
35.
ShiKWuYLiuS (2022) Slope climbing of urban expansion worldwide: spatiotemporal characteristics, driving factors and implications for food security. Journal of Environmental Management324: 116337. https://doi.org/10.1016/j.jenvman.2022.116337
36.
ShiKYuBMaJ, et al. (2023b) Impacts of slope climbing of urban expansion on global sustainable development. The Innovation4(6): 100529. Available at: https://doi.org/10.1016/j.xinn.2023.100529
37.
SongYPengQLuJ, et al. (2024) Using negative exponential function to characterize built-up land density along slope gradient for 19 urban areas in China. Journal of Mountain Science21(11): 3859–3870. https://doi.org/10.1007/s11629-024-9034-9
38.
SontaAJiangX (2023) Rethinking walkability: exploring the relationship between urban form and neighborhood social cohesion. Sustainable Cities and Society99: 104903. https://doi.org/10.1016/j.scs.2023.104903
39.
TianYShuaiYMaX, et al. (2022) Improved landscape expansion index and its application to urban growth in urumqi. Remote Sensing14(20): 5255. https://doi.org/10.3390/rs14205255
40.
WangLSaizALiW (2024) Natural fragmentation increases urban density but impedes transportation and city growth worldwide. Nature Cities1(10): 642–653. https://doi.org/10.1038/s44284-024-00118-5
41.
WentzEYorkAAlbertiM, et al. (2018) Six fundamental aspects for conceptualizing multidimensional urban form: a spatial mapping perspective. Landscape and Urban Planning179: 55–62. https://doi.org/10.1016/j.landurbplan.2018.07.007
42.
XuZJiaoLLanT, et al. (2021) Mapping hierarchical urban boundaries for global urban settlements. International Journal of Applied Earth Observation and Geoinformation103: 102480. https://doi.org/10.1016/j.jag.2021.102480
43.
YangCXiaRLiQ, et al. (2021) Comparing hillside urbanizations of beijing-tianjin-hebei, yangtze river delta and guangdong–hong kong–macau greater bay area urban agglomerations in China. International Journal of Applied Earth Observation and Geoinformation102: 102460. https://doi.org/10.1016/j.jag.2021.102460
44.
YangCGuoWZhangC, et al. (2022) Characteristics and trends of hillside urbanization in China from 2007 to 2017. Habitat International120: 102502. https://doi.org/10.1016/j.habitatint.2021.102502
45.
YangCHuangQXianQ, et al. (2025) Evolution paths of urban forms influenced by landforms: asynchrony but convergence. Ecological Indicators170: 113127. https://doi.org/10.1016/j.ecolind.2025.113127
46.
YaoLPengKLiC, et al. (2025) Decoding urban form through street networks: a nationwide analysis of Chinese cities. Cities158: 105711. https://doi.org/10.1016/j.cities.2025.105711
47.
ZhangPGhoshDParkS (2023a) Spatial measures and methods in sustainable urban morphology: a systematic review. Landscape and Urban Planning237: 104776. Available at: https://doi.org/10.1016/j.landurbplan.2023.104776
48.
ZhangLWangYBianH, et al. (2025) Understanding the ecological impacts of vertical urban growth in mountainous regions. Ecological Informatics87: 103079. https://doi.org/10.1016/j.ecoinf.2025.103079
49.
ZhangXZhangQZhangX, et al. (2023b) Spatial-temporal evolution pattern of multidimensional urban shrinkage in China and its impact on urban form. Applied Geography159: 103062. Available at: https://doi.org/10.1016/j.apgeog.2023.103062
50.
ZhouLDangXMuH, et al. (2021) Cities are going uphill: slope gradient analysis ofurban expansion and its driving factors in China. Science of the Total Environment775: 145836. https://doi.org/10.1016/j.scitotenv.2021.145836
51.
ZhouLLeWLopez-CarrD, et al. (2024) Identification of irregular extension features and fragmented spatial governance within urban fringe areas. Applied Geography162: 103172. https://doi.org/10.1016/j.apgeog.2023.103172
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