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Application of Remote Sensing Technique to Estimate Leaf Area Index in Ayer Hitam Forest Reserve, Puchong, Selangor, Malaysia

Leaf Area Index (LAI), quantifies the total foliage per unit ground surface area. It is the "driving" biophysical variable and is therefore an important input parameter to many hydrological, ecological and climate models. In this study, we develop LAI estimation model for obtaining LAI val...

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Main Author: Wong, Zee Yeng
Format: Thesis
Language:English
Published: 2005
Online Access:http://ethesis.upm.edu.my/id/eprint/2033/1/FH_2005_5.pdf
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spelling oai:ethesis.upm.edu.my:2033 http://ethesis.upm.edu.my/id/eprint/2033/ Application of Remote Sensing Technique to Estimate Leaf Area Index in Ayer Hitam Forest Reserve, Puchong, Selangor, Malaysia Wong, Zee Yeng Leaf Area Index (LAI), quantifies the total foliage per unit ground surface area. It is the "driving" biophysical variable and is therefore an important input parameter to many hydrological, ecological and climate models. In this study, we develop LAI estimation model for obtaining LAI value using LANDSAT TM data image analysis. The use of vegetation indices acquired h m remotely sensed data considered as mean of estimating LAX. A study was carried out to estimate LA1 using Normalised Difference Vegetation Index (NDVI) using Landsat 'Rvl data. The objective of this study was to estimate LAI in Air Hitam Forest Reserve (AHFR) using NDVI, in which, the empirical relationship between LAI (NDVI) and measured LAI (LICOR 2000) was developed. The AHFR, located in Puchong, Selangor, Malaysia was chosen for this study. Landsat TM was digitally processed and enhanced using ERDAS IMAGINE 8.4 which produced the NDVI map. Based on this NDVI values, 12 sample plots of 20 m x 40 m were established to measure the LAI (using LICOR 2000) along with six stand parameters namely the dbh, height, crown volume, stand density, basal area and light intensity. The measurements were analysed to determine the descriptive statistic of each plot using SPSS Software. LA1 was later regressed against the stand variables as well as the NDVI value, derived earlier from the Landsat TM image, to establish the regression fit. Once the regression fit model between NDVI and LA1 was obtained, the NDVI image data was converted to the mapping of LAI. The accuracy of LAI was evaluated using the accuracy assessment in ERDAS IMAGINE 8.4. Stand characteristic variables such as dbh, height, crown volume, basal area and light intensity showed correlation with LAI except stand density. It also produced correlation with the NDVI which was derived fiom Landsat TM. Linear relationship described the relationship between LA1 and NDVI with the regression equation of LAI = 7.0861 xNDV1+ 1.0929 with high R~ of 0.81 with significance level of 0.05. The range of LAI observed (LICOR 2000) was similar to the overall range in LAI from the NDVI. Through the models of LAI value estimation, LAI mapping on AHFR can be done with each pixel holding its own LAI value. This study suggests that remote sensing can be used to estimate LA1 in forest stands and produce LAI map in AHFR subsequently provide predictive models of LAI specific for forest stands. 2005-05 Thesis NonPeerReviewed application/pdf en http://ethesis.upm.edu.my/id/eprint/2033/1/FH_2005_5.pdf Wong, Zee Yeng (2005) Application of Remote Sensing Technique to Estimate Leaf Area Index in Ayer Hitam Forest Reserve, Puchong, Selangor, Malaysia. Masters thesis, Universiti Putra Malaysia. (FH 2005 5).
institution UPM eTHESES
collection UPM eTHESES
language English
description Leaf Area Index (LAI), quantifies the total foliage per unit ground surface area. It is the "driving" biophysical variable and is therefore an important input parameter to many hydrological, ecological and climate models. In this study, we develop LAI estimation model for obtaining LAI value using LANDSAT TM data image analysis. The use of vegetation indices acquired h m remotely sensed data considered as mean of estimating LAX. A study was carried out to estimate LA1 using Normalised Difference Vegetation Index (NDVI) using Landsat 'Rvl data. The objective of this study was to estimate LAI in Air Hitam Forest Reserve (AHFR) using NDVI, in which, the empirical relationship between LAI (NDVI) and measured LAI (LICOR 2000) was developed. The AHFR, located in Puchong, Selangor, Malaysia was chosen for this study. Landsat TM was digitally processed and enhanced using ERDAS IMAGINE 8.4 which produced the NDVI map. Based on this NDVI values, 12 sample plots of 20 m x 40 m were established to measure the LAI (using LICOR 2000) along with six stand parameters namely the dbh, height, crown volume, stand density, basal area and light intensity. The measurements were analysed to determine the descriptive statistic of each plot using SPSS Software. LA1 was later regressed against the stand variables as well as the NDVI value, derived earlier from the Landsat TM image, to establish the regression fit. Once the regression fit model between NDVI and LA1 was obtained, the NDVI image data was converted to the mapping of LAI. The accuracy of LAI was evaluated using the accuracy assessment in ERDAS IMAGINE 8.4. Stand characteristic variables such as dbh, height, crown volume, basal area and light intensity showed correlation with LAI except stand density. It also produced correlation with the NDVI which was derived fiom Landsat TM. Linear relationship described the relationship between LA1 and NDVI with the regression equation of LAI = 7.0861 xNDV1+ 1.0929 with high R~ of 0.81 with significance level of 0.05. The range of LAI observed (LICOR 2000) was similar to the overall range in LAI from the NDVI. Through the models of LAI value estimation, LAI mapping on AHFR can be done with each pixel holding its own LAI value. This study suggests that remote sensing can be used to estimate LA1 in forest stands and produce LAI map in AHFR subsequently provide predictive models of LAI specific for forest stands.
format Thesis
author Wong, Zee Yeng
spellingShingle Wong, Zee Yeng
Application of Remote Sensing Technique to Estimate Leaf Area Index in Ayer Hitam Forest Reserve, Puchong, Selangor, Malaysia
author_facet Wong, Zee Yeng
author_sort Wong, Zee Yeng
title Application of Remote Sensing Technique to Estimate Leaf Area Index in Ayer Hitam Forest Reserve, Puchong, Selangor, Malaysia
title_short Application of Remote Sensing Technique to Estimate Leaf Area Index in Ayer Hitam Forest Reserve, Puchong, Selangor, Malaysia
title_full Application of Remote Sensing Technique to Estimate Leaf Area Index in Ayer Hitam Forest Reserve, Puchong, Selangor, Malaysia
title_fullStr Application of Remote Sensing Technique to Estimate Leaf Area Index in Ayer Hitam Forest Reserve, Puchong, Selangor, Malaysia
title_full_unstemmed Application of Remote Sensing Technique to Estimate Leaf Area Index in Ayer Hitam Forest Reserve, Puchong, Selangor, Malaysia
title_sort application of remote sensing technique to estimate leaf area index in ayer hitam forest reserve, puchong, selangor, malaysia
publishDate 2005
url http://ethesis.upm.edu.my/id/eprint/2033/1/FH_2005_5.pdf
_version_ 1782701354162061312
score 12.935284

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