Red-NIR Soil-Line Coefficients Derived from Satellite Time Series
Abstract
If soil color is temporally stable, it should be possible to derive pixel-specific soil-line coefficients from time sequences of satellite imagery. We derive two-band soil-line coefficients for Red and NIR reflectance using Terra MODIS 8-day composite products spanning 16 years, from 2000 to 2015, in a semi-arid region of Kabul, and map them to examine the temporal stability and spatial dependence of the soil line coefficients. Analysis of the temporal stability of the coefficients shows that, while they are generally stable, there is some fluctuation from year to year. The fluctuation may be an artifact of the regression process, but it may also represent real change in the soil content or structure. Semi-variograms of the Red-NIR soil-line coefficients derived from a 16-year sequence of remotely sensed satellite imagery show a clear spatial correlation within some tens of kilometers in the study area, and they appear to correspond roughly to soil types.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.B14B..07Y
- Keywords:
-
- 0439 Ecosystems;
- structure and dynamics;
- BIOGEOSCIENCESDE: 0480 Remote sensing;
- BIOGEOSCIENCESDE: 1632 Land cover change;
- GLOBAL CHANGEDE: 1807 Climate impacts;
- HYDROLOGY