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Spectral Signature Identification of Crops Through Ground and Satellite Remote Sensing

A.F.M. Tariqul Islam
SO
ASICT Division, BARI, Gazipur-1701

Dr. Md. Lutfur Rahman
PSO
T&C wing, BARI, Gazipur-1701

Dr. Md. Saiful Islam
SSO
ASICT Division, BARI, Gazipur-1701

Dr. A.K.M. Saiful Islam
Associate Professor
IWM Division, BUET, Dhaka

Dr. Sujit Kumar Bala
Associate Professor
IWM Division, BUET, Dhaka

Dr. Tarekul Islam
Associate Professor
IWM Division, BUET, Dhaka

Md. Saidur Rahman
SO
ASICT Division, BARI, Gazipur-1701

Abstract/ Executive Summary:

Spectral reflectance indices provide a useful tool for monitoring crop-growing status. This study was conducted during the year 2010-2012 to identify the spectral signature of crops as well as to compare Vegetation Indices (VI) of crops derived from both satellite images and ground-based measurements taken by the spectroradiometer. A series of spectral data were collected using spectroradiometer from different crops fields such as Potato, Wheat, Maize and Mustard over the crop growing season. The Normalized Difference Vegetative Index (NDVI) based growth curve of those crops showed the expected results. The NDVI values of potato were calculated from both systems i.e. MODIS satellites and spectroradiometer generated spectral data. The VI of potato derived from both systems were different through the growing stage of the crop. The VI values calculated from the spectroradiometer measurements were higher than those from the satellite image. The vegetation indices derived from both systems followed the expected trend of crop growing pattern over the time. The information derived from multispectral images seemed to possess the potentiality for monitoring the general growth status of crop field.

Keywords: NDVI, MODIS, Spectroradiometer, Satelite remote sensing

Location: Munshigonj district

Start Date: 00-00-2010

End Date: 00-00-2012

Program Area: Knowledge Management

Non-commodity: Remote sensing

Objectives:

1. To identify the spectral signature of crops

2. To validate accuracy of remote sensing derived results with the ground.

Methodology:

The study fields were located at sadar upazila of Munshigonj district and Regional Wheat Research Center (RWRC) and Irrigation & Water Management (IWM) fields, BARI, Gazipur. Two potato fields (23°31.471'N, 90°31.773'E and 23°30.944'N, 90°31.494'E) at Munshigonj sadar upazila, a wheat field (23°59.319'N, 90°24.729'E) at WRC, BARI and another different crops (such as wheat, maize, potato and mustard) field (23°59.156'N, 90°24.739'E) at IWM, BARI were selected for this study. Eight spectral reflectance of Potato fields were collected using ASD portable spectroradiometer over the potato-growing period in the study fields from 23 December 2010 to 17 March 2011 at Munshigonj sadar upazila. Eight spectral reflectance of Potato, Wheat, Maize and Mustard were collected using spectroradiometer over the crops growing period from 18 December, 2011 to 01 April 2012. The instrument could detect reflected light from canopy ranging from 325 nm to 1075 nm wavelengths with a sampling interval of 1.4 nm of the range. Spectral signatures of potato were identified from both images and portable spectroradiometer to validate accuracy of remote sensing derived results with the ground. For other crops spectral signatures as well as crop growth cycle were determined. The entire laboratory works e.g. spectral data processing; image analysis, etc. were conducted at GIS and Remote Sensing Laboratory, ASICT Division of BARI as well as at IWFM, BUET.

Source of Information: Annual report 2012, BARI

Article Link (Online Journal):

Funding Source:

1.	Budget: 50,000/-

Total Budget (Tk.) : 50,000/-

Achievement/Findings:

The result imply that the information derived from multispectral images will help to adopt the quickest and accurate approach for monitoring the general growth status of crop field.

Knowledge Management: Report/Proceedings