For the final three a long time, Landsat spacecraft have collected specialized digital pictures of the Earth’s continents and coastal areas. Scientists and researchers use these images to judge dynamic modifications in our surroundings, both natural phenomena and adjustments caused by human activities.
Landsat Information Continuity Mission (LDCM) atau dikenal juga dengan nama Landsat 8 merupakan satelit generasi terbaru dari Program Landsat. Satelit ini merupakan mission gabungan antara USGS dan NASA beserta NASA Goddard Space Flight Heart dan diluncurkan pada hari Senin, 11 Februari 2013 di Pangkalan Angkatan Udara Vandeberg, California – Amerika Serikat.
After receiving an email from the ESPA system notifying you that your order is processed, obtain the order from inside R utilizing the espa_download operate by specifying 1) the e-mail tackle you used to place the order, 2) the ESPA order ID quantity (included within the e mail from ESPA), and 3) the output folder in which to save the downloaded photographs. espa_download will first verify throughout the specified output folder to see if each picture already exists, and won’t re-obtain present information until the present information do not match the recordsdata obtainable on ESPA.
Conversion to floor reflectance usually requires some sort of atmospheric compensation. USGS makes use of the LEDAPS software ( Schmidt et al. 2013 ) to transform raw Landsat information to surface reflectance. LEDAPS requires a variety of atmospheric inputs to constrain an atmospheric mannequin. These include outputs of a 6S mannequin run, a DEM, whole column ozone, Nationwide Facilities for Environmental Prediction (NCEP) modeled floor pressure, temperature and water vapor ( Kalnay et al. 1996 ).
Untuk membuka dan manggabungkan layer tersebut dapat menggunakan salah satu perangkat lunak GIS, dalam hal ini saya gunakan ArcGIS. Maka buka program ArcMap. Kemudian add data layer untuk band landsat yang kan kita buat komposit di ArcMap. Misal kita akan membuat layer komposit 432, komosisi band 432 ini akan menghasilkan warna pure. Tambahkan layer band four, 3, dan 2 ke dalam ArcMap. Kemudian urutkan layer band citra yang akan kita buat komposit, Kemudian urutkan layer band 4 paling atas diikuti layer band three dan band 2.
