KAJIAN ESTIMASI KANDUNGAN OKSIDA BESI MENGGUNAKAN CITRA MULTIPSEKTRAL RESOLUSI SEDANG DI SEBAGIAN TOPOGRAFI KARST GUNUNGSEWU WILAYAH KABUPATEN GUNUNGKIDUL

YANUAR ADJI NUGROHO, Taufik Hery Purwanto, S.Si., M.Si

2013 | Skripsi | KARTOGRAFI DAN PENGINDRAAN JAUH

Penginderaan jauh (PJ) dapat digunakan untuk identifikasi, inventarisasi dan pemetaan kandungan oksida besi, namun pemanfaatannya di Indonesia masih sangat terbatas dan membutuhkan kajian. Skripsi ini bertujuan mengkaji pemanfaatan citra PJ multispektral resolusi sedang, yaitu Landsat TM dan ALOS AVNIR-2 untuk estimasi kandungan oksida besi di sebagian topografi karst Gunungsewu, mengkaji pengaruh perbedaan karakteristik resolusi spasial dan spektral diantara ALOS AVNIR-2 dan Landsat TM serta input model empiris, yaitu band asli, band aritmatik dan PC band, hubungannya dengan efektivitas dan akurasi informasi yang dihasilkan. Hasil pengolahan citra digital dan uji lapangan menunjukan bahwa citra Landsat TM dan ALOS AVNIR-2 dapat digunakan untuk estimasi kandungan oksida besi di sebagian topografi karst Gunungsewu. Resolusi spasial lebih berpengaruh dalam estimasi kandungan oksida besi di sebagian topografi karst Gunungsewu dibandingkan dengan resolusi spektral. Band aritmatik adalah yang paling unggul dalam hal akurasi dibandingkan band asli dan PC band, namun dalam hal kemudahan pemahaman konsep dan penerapan tehnis band asli adalah yang terbaik dan selain itu akurasinya hanya selisih sedikit di bawah band aritmatik dan PC band. Akurasi band asli citra ALOS AVNIR-2 adalah sebesar 46.307 – 65.159%, akurasi band asli citra Landsat TM adalah sebesar 48.167 – 64.633%, akurasi band aritmatik ALOS AVNIR-2 adalah sebesar 41.043 - 67.630 %, akurasi band aritmatik Landsat TM adalah sebesar 40.560 – 67.575 %, akurasi PC band ALOS AVNIR-2 adalah sebesar 48.737 – 66.221%, akurasi PC band Landsat TM adalah sebesar 41.774 – 65.767%.

Remote sensing can be used for identification, inventory and mapping iron oxide content, however the utilization of this technology is still lacking and needs to be examined. The aim of this research is to assess the multispectral medium resolution image, which are Landsat TM and ALOS AVNIR-2 for estimating iron oxide content, to assess the influence of different spatial and spectral resolution characteristics between those imageries as well as the effectiveness and accuracy of input empirical models, using original bands, band arithmetic and PC band from the remote sensing image. This study took place at part of Gunung Sewu Karst Topography, Gunung Kidul, Yogyakarta Province. Application of digital image processing to multispectral medium resolution imageries which combined Landsat TM and ALOS AVNIR-2images with field survey can be used for estimating iron oxide content in part of Gunungsewu karst topography, by employing original band, arithmetic band and PC band. The results suggested that spectral resolution is more significant than spatial resolution for estimating iron oxide content in Gunung Sewu karst topography. Furthermore, aritmethic bands have the advantage in terms of accuracy compared with the original band and PC band but the original band was the most superior in terms of understanding concept and technical application, moreover the accuracy of original band model is only slightly below the arithmetic band. Original band of ALOS AVNIR-2 were able to obtain the accuracy at the level of 46.307 – 65.159%, original band of Landsat TM were able to obtain the accuracy at the level of 48.167 – 64.633%, aritmethic band of ALOS AVNIR-2 were able to obtain the accuracy at the level of 41.043 - 67.630 %, aritmethic band of Landsat TM were able to obtain the accuracy at the level of 40.560 – 67.575 %, PC band of ALOS AVNIR-2 were able to obtain the accuracy at the level of 48.737 – 66.221%, PC band of Landsat TM were able to obtain the accuracy at the level of 41.774 – 65.767 %.

Kata Kunci : Oksida besi, Citra Multispektral Resolusi Sedang, Topografi Karst Gunungsewu