Using high resolution satellite imagery to improve sweet potato crop statistics in Uganda

L. Claessens, P. Zorogastúa, R. Quiroz, M. Potts & S. Namanda

IntroductionStudy area : characteristicsPhysical bases of remote sensingImagery Digital image processingResultsConclusions

AFRICA

UGANDA

IntroductionStudy area : characteristicsPhysical bases of remote sensingImagery Digital image processingResultsConclusions

Kumi climatic diagram

0

20

40

60

80

100

120

140

160

180

200

Jan Feb Mar May Apr Jun Jul Aug Sep Oct Nov Dic

Months

Pre

cip

itat

ion

/ E

T (

mm

)

0

10

20

30

40

50

60

70

80

90

100

Tem

per

atu

re (

ºC )

Pp ET T max T min

Source: FAO

IntroductionStudy area : characteristicsPhysical bases of remote sensingImagery Digital image processingResultsConclusions

B RG NEAR IR MID INFRARED

500 1000 1500 2000 2500

010

2030

4050

Wavelength in nanometers

% R

efle

ctan

ce

water

Green vegetation

Dry vegetation

Soil

Generic spectral signatures

IntroductionStudy area : characteristicsPhysical bases of remote sensingImagery Digital image processingResultsConclusions

SPOT Satellite

Source: www.spotimage.com

SOURCE: SPOTIMAGE-CNESS

Kumi Spot Image 06-May-06

IntroductionStudy area : characteristicsPhysical bases of remote sensingImagery Digital processingResultsConclusions

CROPS REFLECTANCES

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

300 400 500 600 700 800 900 1000 1100 1200

Wavelength

Re

fle

cta

nc

e

Maize Bare Soil Millet Sweet potato Cassava Banana

IntroductionStudy area : characteristicsPhysical bases of remote sensingImagery Digital image processingResultsConclusions

Sweet potato plot

Distribution of Sweet potato fields around Kumi town

IntroductionStudy area : characteristicsPhysical bases of remote sensingImagery Digital image processingResultsConclusions

Kumi Land cover - land use

Category Ha. %Water bodies 14769 5.7Wetland 16886 6.5Grassland/other crops 109564 42.4Sweet potato 28353 11.0Forest/mangoes 30354 11.7Urban-areas_Bare-soil 31390 12.1Fallow land 21310 8.2ND 5822 2.3

258447 100.0

LEGEND

Kumi Land cover - land use

Category Ha. %Water bodies 14769 5.7Wetland 16886 6.5Grassland/other crops 109564 42.4Sweet potato 28353 11.0Forest/mangoes 30354 11.7Urban-areas_Bare-soil 31390 12.1Fallow land 21310 8.2ND 5822 2.3

258447 100.0

LEGEND Area planted by Kumi for Sweet potato

0

5,000

10,000

15,000

20,000

25,000

30,000

1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2,003

Year

Ha.

THANKSTHANKS