UGBONG, P. U.; ISMA’IL, M.; USMAN, A. K. GEOSPATIAL ESTIMATION OF ROOFTOP SOLAR PHOTOVOLTAIC POTENTIAL IN CALABAR MUNICIPAL, CROSS RIVER STATE, NIGERIA. FUDMA JOURNAL OF SCIENCES, v. 7, n. 3, p. 272 - 281, 30 Jun. 2023.