Spatial Assessment of Urban Vegetation Density Using Landsat 8 NDVI: A Case Study of Sibolga, Indonesia. YKP JOURNAL, [S. l.], v. 2, n. 1, p. 19–28, 2026. DOI: 10.63639/ykp.v2i1.155. Disponível em: https://ykpjournal.org/index.php/ykpjournal/article/view/155. Acesso em: 30 jul. 2026.