RESULTS OF THE PROGRAM FOR 2000




	Conabio ť Hot spots ť Results of the program for 2000

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The program was conducted with AVHRR satellite images taken at night and during the day, provided by the Institute of Geography of the UNAM (the exact time the image was recorded is shown in the tables).

GENERAL MAP

The general map presents all the hot spots detected with images taken at night, during the period January 1 to August 31, 2000. The map is a composit of the detected hot spots of each day of this period. Missing dates on the map either are days without hots spots or days without images.

Images processed

The following tables show the total of days per month with detected hot spots, the number of missing images per month and the number of days without hot spots.

AVHRR nighttime images

	JAN.	FEB.	MAR.	APR.	MAY	JUNE	JULY	AUG.
Days without image	1	0	0	0	1	2	1	3
Days with points of heat detected	20	23	27	29	28	14	12	19
Days without points of heat detected	10	6	4	1	2	14	18	9

AVHRR daytime images

	JAN.	FEB.	MAR.	APR.	MAY	JUNE	JULY	AUG.
Days without image	1	4	0	0	0	1	2	0
Days with points of heat detected	31	23	31	30	30	24	24	26
Days without points of heat detected	0	2	0	0	1	5	5	5

Total number of images processed

Nighttime	236
Daytime	237
Total	473

Frequency of hot spot detection on the same location

The table shows the percentage of days when hot spots were detected on the same location (not necessarily consecutive days).

Nighttime images

No. of days	Percentage
1	88.28
2	10.36
3	0.98
4	0.22

Note: One single point of heat was detected 22 times; the coordinates were verified in field by the State Center for Emergencies of Campeche, which reported that the coordinates correspond to a PEMEX (Petróleos Mexicanos) nitrogen plant.

Daytime images

No. of days	Percentage
1	82.35
2	13.99
3	2.79
4	0.62
5	0.18

Most affected natural vegetation

Of the 4 384 hot spots detected with nighttime images, 58.8% were registered in areas with undisturbed natural vegetation (that is, those categories of vegetation that do not present fragmentation or perturbation according to the classification of the National Institute of Statistics, Geography and Data Processing of 1996, preliminary version). Of the points detected with daytime images, 36.9% were located within this category. Below is the distribution by group of vegetation

Images taken at night

Vegetation	Percentage
Forests	83.8
Tropical Forests	10.7
Underbrush	2.5
Natural pasture	0.7
Other types of vegetation	2.3

Images taken during the day

Vegetation	Percentage
Forests	55
Tropical Forests	27
Underbrush	12
Natural pasture	1
Other types of vegetation	5

The five types of vegetation with highest occurrence of hot spots are shown in the following tables.

Images taken by night

Type of vegetation	Percentage by night	Percentage by day
Pine-oak forest	31.0	18.3
Oak forest	25.4	18.1
Pine forest	14.5	10.7
Oak-pine forest	10.5	6.9
Low tropical drought deciduous forest	6.5	13.5