Object Based Image Segmentation Algorithm of SAGA GIS for Detecting Urban Spaces in Yaoundé, Cameroon

Central European Journal of Geography and Sustainable Development, 2(2), 38-51

14 Pages Posted: 18 Feb 2021

See all articles by Polina Lemenkova

Polina Lemenkova

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Date Written: December 12, 2020

Abstract

Present study is focused on the satellite image processing by means of SAGA GIS. The objective of the study is assessment and analysis of the core urban areas and its spatial distribution in the limits of the city and suburbs. The study area includes Yaoundé and its surroundings, Republic of Cameroon. The methodology includes Object Based Image Segmentation (OBIS) approach by SAGA GIS. The paper presents a methodologically structured workflow used in SAGA GIS for segmentation of the Sentinel-2A image. The segmentation techniques includes adjusting technical parameters, performing neighborhood approach and post-processing procedures (unsupervised classification, number of clusters). The OBIS model and SAGA GIS were used as main methods and machine learning techniques for image segmentation. Data include Sentinel-2A satellite image with high resolution (10 m). The image was analyzed by two approaches of cell neighborhood analysis: Moore and Neumann. The results showed following numerical parameters of the computed area: the perimeter of 1,060,560 km and an area estimated for the Yaoundé city 191,745,000 km2. The Neumann approach demonstrated better results for image clustering. The results presented automatically detected and separated segments of the city areas and other land cover types (savannah, forests, mountains). The spectral reflectance of various land cover types on a satellite image enables to group pixels of the image into classes using segmentation technique which has an important impact on the conceptual methodology of the urban mapping. The results of the image segmentation show the average values of the Neumann approach more correct in urban area than Moore approach. The accuracy assessment demonstrated 74.63% for the core urban area by using the Neumann method. The applicability of SAGA GIS for automated methods of image processing using machine learning algorithm of OBIS is presented and the advantages are discussed. The study demonstrated the effectiveness of the high-resolution Sentinel-2A for socio-economic studies, exemplified by urban mapping where remote sensing data serve as reliable sources of geoinformation. The advantages of the OBIS are discussed with detailed explanation of the SAGA GIS workflow.

Keywords: Sentinel-2A, object based image analysis, segmentation, machine learning, SAGA GIS

JEL Classification: Y92, Q00, Q01, Q23, Q24, Q30, Q32, Q35, Q40, Q40, Q50, Q51, Q53, Q54, Q55, Q56, Q57

Suggested Citation

Lemenkova, Polina, Object Based Image Segmentation Algorithm of SAGA GIS for Detecting Urban Spaces in Yaoundé, Cameroon (December 12, 2020). Central European Journal of Geography and Sustainable Development, 2(2), 38-51, Available at SSRN: https://ssrn.com/abstract=3751973

Polina Lemenkova (Contact Author)

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences ( email )

Bolshaya Gruzinskaya Str., 10
Bld. 1
Moscow, 123995
Russia
+007-916-298-37-19 (Phone)

HOME PAGE: http://https://www.researchgate.net/profile/Polina_Lemenkova

Do you have a job opening that you would like to promote on SSRN?

Paper statistics

Downloads
6
Abstract Views
61
PlumX Metrics