English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The capability of L-band radar backscatter to penetrate through the forest canopy is useful for mapping the forest structure, includingabove ground biomass (AGB) estimation. Recent studies confirmed that the empirical AGB models generated from the L-band radarbackscatter can provide favourable estimation results, especially if the data has dual-polarization configuration. Using dualpolarimetry SAR data the backscatter signal is more sensitive to forest biomass and forest structure because of tree trunk scattering,thus showing better discriminations of different forest successional stages. These SAR approaches, however, need to be furtherstudied for the application in tropical peatlands ecosystem We aims at estimating forest carbon stocks and stand biophysicalproperties using combination of multi-temporal and multi-polarizations (quad-polarimetric) L-band SAR data and focuses ontropical peat swamp forest over Kampar Peninsula at Riau Province, Sumatra, Indonesia which is one of the most peat abundantregion in the country.  Applying radar backscattering (Sigma nought) to model the biomass we found that co-polarizations (HH and VV) band are moresensitive than cross-polarization channels (HV and VH). Individual HH polarization channel from April 2010 explained > 86% ofAGB. Whereas VV polarization showed strong correlation coefficients with LAI, tree height, tree diameter and basal area.Surprisingly, polarimetric anisotropy feature from April 2007 SAR data show relatively high correlations with almost all forestbiophysical parameters. Polarimetric anisotropy, which explains the ratio between the second and the first dominant scatteringmechanism from a target has reduced at some extent the randomness of scattering mechanism, thus improve the predictability of thisparticular feature in estimating the forest properties. These results may be influenced by local seasonal variations of the forest as wellas moisture, but available quad-pol SAR data were unable to show these patterns, since all the SAR data were acquired during therainy season.  The results of multi-regression analysis in predicting above ground biomass shows that ALOS PALSAR data acquired in 2010 hasoutperformed other time series data. This is probably due to the fact that land cover change in the area from 2007 – 2009 was highlydynamic, converting natural forests into rubber and Acacia plantations, thus SAR data of 2010 which was acquired in between oftwo field campaigns has provided significant results (F = 40.7, P < 0.005). In general, we found that polarimetric features haveimproved the models performance in estimating AGB. Surprising results come from single HH polarization band from April 2010that has a strong correlation with AGB (r = 0.863). Also, HH polarization band of 2009 SAR image resulted in a moderatecorrelation with AGB (r = 0.440)

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

Estimation of Biomass Carbon Stocks over Peat Swamp Forests using Multi-Temporal and Multi-Polratizations SAR Data