Geodetski list, Vol. 70 (93) No. 1, 2016.
Pregledni rad
Comparison of Vegetation Index Value Based on Digital Number and Top of Atmosphere Reflectance
Luka Rumora
orcid.org/0000-0002-2362-6685
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Ivan Medved
; Hrvatski šumarski institut, Jastrebarsko, Hrvatska
Ivan Pilaš
; Hrvatski šumarski institut, Jastrebarsko, Hrvatska
Damir Medak
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Sažetak
Remote sensing is common way for collecting large amount of data across large area as a result of satellite missions. Collected satellite images allows gathering informations for understanding Earth processes. Biggest advantage was free satellite data access. Accessing large amount of free data, number of methods for processing gathered satellite images were developed. With technology development, processed data have better quality. This article shows two ways of processing satellite data for gathering informations about quality of vegetation index calculated with digital number and with reflectance. Steps of calculation reflectance for each pixel from digital number is shown. Leaps in results, caused by clouds, were analysed by visual interpretation of image and from results of calculated normalized difference vegetation index (NDVI).
Ključne riječi
digital number; top of atmosphere reflection; normalized difference vegetation index; Landsat 7
Hrčak ID:
156883
URI
Datum izdavanja:
25.3.2016.
Posjeta: 1.936 *