RESULTS FROM THE 2002 PROGRAM




	Conabio ť Hot spots ť Results from the 2002 program

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The program was carried out from January 8 to October 31 using AVHRR daytime and nighttime satellite images. MODIS satellite images were used beginning April, based on two passes.

Nighttime AVHRR images are taken between 1:00 and 6:00 local time. Daytime AVHRR images are taken between 16:30 and 19:00. MODIS images are taken between 10:50 and 14:00. The difference between pass 1 and pass 2 is approximately 1 hour and 30 minutes. The exact hour of the image taken is shown in the section with tabular information.

General Map

The general map shows all hot spots detected with nighttime AVHRR images for the period January 8 to October 31, 2002. This map is the result of superimposing maps corresponding to each of the days on which hot spot were recorded.

Images Analyzed

The following tables show information referring to the number of days without image, to the number of days with information from at least one hot spot, and the total number of days on which no hot spot were detected.

NIGHTTIME AVHRR IMAGES

	Jan.	Feb.	March	April	May	June	July	Aug.	Sept.	Oct.
No image	8	0	0	1	0	0	1	2	4	2
Days with hot spots detected	18	23	30	29	31	30	19	17	14	15
Days without hot spots detected	5	5	1	0	0	0	11	12	12	14

DAYTIME AVHRR IMAGES

	Jan.	Feb.	March	April	May	June	July	Aug.	Sept.	Oct.
No image	10	3	1	3	0	0	2	1	5	2
Days with hot spots detected	20	23	30	27	31	29	25	30	23	22
Days without hot spots detected	1	2	0	0	0	1	4	0	2	7

MODIS IMAGES, PASS 1

	Jan.	Feb.	March	April	May	June	July	Aug.	Sept.	Oct.
No image	*	*	21	*	1	5	9	5	15	26
Days with hot spots detected	*	*	10	*	28	15	12	20	7	4
Days without hot spots detected	*	*	0	*	2	10	10	6	8	1

* Months without published results

MODIS IMAGES, PASS 2

	Jan.	Feb.	March	April	May	June	July	Aug.	Sept.	Oct.
No image	*	*	*	*	9	14	7	11	18	27
Days with hot spots detected	*	*	*	*	22	16	23	20	9	4
Days without hot spots detected	*	*	*	*	0	0	1	0	3	0

* Months without published results

Duration of hot spots at a single location

The following tables show the percentage of days on which hot spots were recorded at a single location (not necessarily consecutive days):

Nighttime AVHRR Images

Number of days
1	89.2%
2	8.9%
3	1.5%
4 and more than 4	0.4%

Daytime AVHRR Images

Number of days
1	85.5%
2	12.5%
3	1.7%
4 and more than 4	0.2%

MODIS Images, Pass 1

Number of days
1	93.0%
2	5.9%
3	0.5%
4 and more than 4	0.3%

MODIS Images, Pass 2

Number of days
1	89.7%
2	9.3%
3	0.9%
4 and more than 4	0.1%

Natural Vegetation Most Affected

The percentage of hot spots located in preserved natural vegetation (that is, those categories of vegetation not presenting fragmentation or disturbance according to the National Institute of Statistics, Geography and Informatics classification of 1996, preliminary version) vary as a function of the satellite and the time of pass. Percentages are as follows: nighttime AVHRR images, 66%; daytime AVHRR images, 33%; MODIS images, pass 1, 24%; MODIS images, pass 2, 42%.

Below is the distribution of the hot spots in preserved natural vegetation, by group:

Nighttime AVHRR Images

Vegetation
Forests	78.5%
Tropical forest	10.3%
Scrubland	5.3%
Natural pastureland	2.6%
Other types of vegetation	3.3%

Daytime AVHRR Images

Vegetation
Forests	53.2%
Tropical forest	33.0%
Scrubland	5.5%
Natural pastureland	2.1%
Other types of vegetation	6.2%

MODIS Images, Pass 1

Vegetation
Forests	52.0%
Tropical forest	35.1%
Scrubland	3.3%
Natural pastureland	1.6%
Other types of vegetation	8.0%

MODIS Images, Pass 2

Vegetation
Forests	62.1%
Tropical forest	26.9%
Scrubland	7.2%
Natural pastureland	1.6%
Other types of vegetation	2.2%

The five types of vegetation most affected by the presence of hot spot are shown in the following table:

Nighttime AVHRR Images		Daytime AVHRR Images		MODIS Images, Pass 1		MODIS Images, Pass 2
Vegetation	Percentage	Vegetation	Percentage	Vegetation	Percentage	Vegetation	Percentage
Pine-oak forest	27.3	Oak forest	20.8	Pine-oak forest	20.8	Pine-oak forest	22.4
Oak forest	25.0	Pine-oak forest	16.4	Low tropical drought deciduous forest	12.9	Oak forest	21.4
Pine forest	15.5	Low tropical drought deciduous forest	11.9	Oak forest	11.3	Low tropical drought deciduous forest	20.7
Oak-pine forest	8.4	Medium tropical evergreen rain forest	8.8	Pine forest	9.3	Pine forest	10.3
Low tropical drought deciduous forest	5.7	Pine forest	8.7	Medium tropical evergreen rain forest	6.4	Oak-pine forest	7.0