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7/23/2019 Remote Sensing and Gis in Agriculture
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REMOTE SENSING ANDGIS IN AGRICULTURE
PRESENTE
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MONITORING CROP STATUS
Identifying Stressed Plants. Chlorophyll is essential part of photosynthesis. Amount of Chlorophyll is estimated. By om!ining more than one !ands of the reorded
remote sensing data "e an reate #egetation indiesand estimate rop status.
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CONTD...
Estimating "ater ontent from remote sensing $ater is essential for plant gro"th. As a result stomata is released !y the proess of
transpiration.
If "ater is insuffiient the plant is stressed and the heat isnot remo#ed.
This heat an !e deteted !y RE%&TE SENSIN' !y using
parts of spetrum that is sensiti#e to heat.
'reen ( a#erage.
!lue ( suffiient
red ( lo".
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CONTD...
Com!ating pests and diseases Addition to plant under stress and la) of "ater "e
an also find plant effeted !y pests. It is ahie#ed !y om!ining agriultural )no"ledge and
remote sensing. The red part in the !elo" piture sho"s the plants
effeted !y pests. Destrution aused !y pests redues leaf area inde*.
$e an identify +AI hene "e an find the inset
atta) at an early stage.
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CROP IDENTIFICATION
$hy do "e need to identify rops,, As it inreases the finanial !enefits if the ountry. To plan imports and e*ports.
Cadastral mapping( It is nothing !ut mapping of the !oundaries of thefield.
Cadastral maps are in #etor format and pro#ides
some speial data.
It is generally used !y national authorities.
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CONTD...
-o" to identify rop types "ith Remote
sensing,, egetation is generally green in olour !ut shades of
green is different for #arious rops.
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True olour image /alse olour image
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CONTD...
Remote sensing data re0uired( To identify the type of rop "e need to )no" the
gro"th yle of partiular rops. Also "e ha#e to )no" ho" the rops reflet the near
infra red at eah of their #arious gro"th stages.
%ay 1Belgium2 August 1Belgium2
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CONTD...
If "e ompare the same fields in the t"o images3 "e
an see that in some ases the signal is different. /ields that appear red are full of #egetation3 "hereas
those that appear !lue either ha#e #ery little or no
#egetation at all. By ha#ing )no"ledge on "hen the rop is ulti#ated
and har#ested and !y studying 4 or more images from
the same gro"th period "e an find the type of rops.
Image lassifiation.
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ESTIMATING CROP YIELD
Estimating rop yield using only remote
sensing( There are t"o "ays to estimate the rop yield. They
are( using only remote sensing and other also uses
some e*tra data.
In may In august
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CONTD...
In may3 rops are at pea) of their gro"th. In august3 plant is fousing its energy in produing the
rop and not produing green !iomass. Chlorophyll !rea)age and !ro"n3 yello" olour
appears to na)ed eye. -o" an "e estimate rop yield !y seeing
remote sensing image,, Comparing satellite images "ith rop yield data of the
rop fields in image.
The image "as proessed and #egetati#e inde* is
formed and ompared to rop yield. The estimation o!tained is limited that partiular
period of time only.
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The use of NDI 1normali5ed differene #egetation
inde*2 is fast and easy method.
/alse olour image NDI image
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Than) you
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