e_ISSN =2775-3409 p_ISSN = - Vol 3 No 2 | Dec 2022 55 Mapping of Limestone Potential Using Landsat 8 Satellite Imageryin Some Areasof Timpeh Sabrina Roselini 1 , Dian Adhetya Arif 2 , Sri Kandi Putri 3 1 Student of the D3 Remote Sensing Technology Study Program, Universitas Negeri Padang, 2 Lecturer Study Program D3 Remote Sensing Technology, Universitas Negeri Padang Email: sabrinaroselini1@gmail.com ABSTRACT: Limestone potential is important information that can be obtained from remote sensing data which has advantages and speed in processing results. Remote sensing is a technology that can overcome the problemof measuring data for fast and accurate information. This research was carried out in some areas of the Timpeh sub- district,a n d Dharmasraya districtusing Landsat 8-OLI imagery with the aimof1) identifying the potential of limestone using the Band Ratio method. 2) How to apply remote sensing in mapping the potential of limestoneusing Landsat 8 Oli imagery. This research was carried out in several stages, namely Pre Processing which included radiometric correction and atmospheric correction, image cropping according to the research area, and processing whichincluded making geological maps, making landform maps, making maps of river flow patterns and vegetationindex maps and limestone identification using the RGB band ratio method (5/4;6/3;4/2). The results of field identification in potential limestone areas, where the RGB (Red Green Blue)composite of the band ratio 5/4;6/3;4/2 shows that the presence of limestone is characterized by the appearanceof greenish-brown colored objects. The average pixel value for limestone with a band ratio of 5/4 is 2.475, for a6/3 ratio is 1.275 and for a 4/3 ratio is 0.788. In this study, the potential area of limestone in the research areawasfound,whichwas approximately 2352,14564 ha. Keywords:Remote Sensing Landsat 8 Imagery,Band Ratio 1. INTRODUCTION Indonesia is a country rich in mining products, both metals and minerals. Various regions in Indonesia have mineral resources in the form of various types of mining materials. One of the minerals is limestone. Limestone is a mineral with enormous potential and is spread in almost all parts of Indonesia (Shubri and Armin, 2014). The potential of limestone in Indonesia is almost in all parts of Indonesia. According to data from Mediadipoera et al (1990), Indonesia's limestone reserves reach 28.7 billion tons. Of the total limestone reserves in Indonesia, around 23.23 billion tons or around 81.02% the reserves are in West Sumatra province, followed by West Java province with a total of 637.82 million tons. One area that has the potential for limestone is the Timpeh sub-district, Dharmasraya district, West Sumatra. In the Timpeh sub-district, there is limestone in the form of a potential resource which is still at the general investigation stage (according to data on non-metallic minerals, West Sumatra Province). it is necessary to do the mapping in a precise and accurate way to determine the distribution of the Limestone. Limestone in some Timpeh sub-districts is only used as a foundation for houses because of its sturdy structure and form and not easily destroyed, many people use this stone as the main raw material in paving. Even though the benefits of limestone are not only that, limestone is used as a raw material or mixed material for various industries such as cement, paint, steel manufacturing, paper industry, and rubber industry. Limestone is also widely applied to the food industry for milk, health supplements, the sugar industry, and even for cosmetic mixtures. This is because industry players do not know information about the presence of limestone in the Timpeh sub-district and the quality of the limestone that meets industry requirements. This study will modify the previous research, namely processing Landsat 8 imagery and then analyzing and carrying out several interpretation methods regarding the distribution of limestone. The interpretation method used in Landsat 8 imagery is the Band Ratio method. They also performed parameter analysis landforms, river flow patterns, and geology and vegetation density for limestone mapping. Through Remote Sensing it is hoped that it will facilitate the presentation of spatial information, especially related to the Potential of Limestone Using Landsat 8 Imagery data in parts of the Timpeh District. This research is expected to later be used as spatial data with a method that is faster and more efficient in identifying the potential of Limestone.