Topic: VIIRS Active Fire Upgrade and Vegetation Index Upgrade

Date/Time Issued: December 3, 2019 2100 UTC

Product(s) or Data Impacted:M-B VIIRS Active Fire

Date/Time of Initial Impact:M-B December 5, 2019 1500 UTC

Date/Time of Expected End: December 5, 2019 1730 UTC

Length of Outage: 2.5 hours

Details/Specifics of Change:M-B

Vegetation Index: This update will change the naming scheme of VI_SR intermediate files, so that "Daily" and "Weekly" VI_SR intermediate files can be ingested under separate product definitions. The change will resolve an operation issue of missing detail during the integration of the previous version: the biweekly VI algorithm had been modified to use two weekly VI_SR files and two daily VI_SR files, instead of sixteen daily VI_SR files.M-B

VIIRS Active Fire:

Output Filename Change

The output filenames will be changed from AF_v1r1_* to AF_v1r2_* for both .txt and .nc to reflect the revision.

Adding persistent anomaly flag

Persistent anomaly flag is added to both NetCDF and ascii formats of active fire product. Each fire pixel is categorized as:

0M-B M-B M-B M-B M-bM-^@M-^S no persistent anomaly

1M-B M-B M-B M-B - oil or gas flare

2M-B M-B M-B M-B M-bM-^@M-^S volcano

3M-B M-B M-B M-B M-bM-^@M-^S solar panel

4M-B M-B M-B M-B M-bM-^@M-^S urban

5M-B M-B M-B M-B M-bM-^@M-^S unclassified

Here is the description of the changes.

ASCII output: Additional column for persistent anomaly is added; the first (title) line is modified.

year,month,day,hh, mm,lon,lat,mask,confidence,bright_t13,frp,line,sample,bowtie,persist_anomaly;M-B nfire = 16

2018, 11, 18, 20, 50, -120.051445, M-B 35.373226, 8, 75, 454.137024, 523.866943, M-B 184, 1851, 0, 3

2018, 11, 18, 20, 50, -120.053154, M-B 35.379963, 7, 0, 458.887634, 568.377380, M-B 185, 1851, 0, 3

2018, 11, 18, 20, 50, -120.062065, M-B 35.378429, 9, 87, 446.435364, 456.827118, M-B 185, 1852, 0, 3

2018, 11, 18, 20, 50, -120.083344, M-B 35.388844, 8, 75, 488.237793, 911.507202, M-B 187, 1854, 0, 3

2018, 11, 18, 20, 50, -120.101158, M-B 35.385788, 8, 39, 310.548340, 3.728809, M-B 187, 1856, 0, 0

2018, 11, 18, 20, 50, -118.601891, M-B 36.226536, 7, 29, 300.670258, 3.968884, M-B 274, 1661, 0, 0

2018, 11, 18, 20, 50, -118.646439, M-B 36.226280, 8, 35, 305.535767, 5.064438, M-B 275, 1666, 0, 0

2018, 11, 18, 20, 50, -118.622269, M-B 36.236893, 9, 99, 357.488892, 53.261333, M-B 276, 1663, 0, 0

2018, 11, 18, 20, 50, -118.647957, M-B 36.232841, 8, 45, 309.880249, 6.892451, M-B 276, 1666, 0, 0

2018, 11, 18, 20, 50, -118.640907, M-B 36.240753, 9, 100, 398.086121, 155.975922, M-B 277, 1665, 0, 0

2018, 11, 18, 20, 50, -118.657928, M-B 36.238068, 9, 84, 334.233887, 23.713444, M-B 277, 1667, 0, 0

2018, 11, 18, 20, 50, -118.739067, M-B 36.395573, 7, 24, 300.086029, 4.420272, M-B 302, 1671, 0, 0

2018, 11, 18, 20, 50, -118.724632, M-B 36.411800, 9, 96, 349.282104, 42.508846, M-B 304, 1668, 0, 0

2018, 11, 18, 20, 50, -118.726379, M-B 36.418312, 9, 84, 326.054657, 18.055126, M-B 305, 1668, 0, 0

2018, 11, 18, 20, 50, -119.584526, M-B 37.810020, 8, 74, 313.540253, 10.418139, M-B 529, 1713, 0, 0

2018, 11, 18, 20, 50, -119.593361, M-B 37.808594, 8, 79, 319.367859, 13.668173, M-B 529, 1714, 0, 0

NetCDF output: Persistent anomaly flag is added both to sparse array of fire pixels and to QA mask.

Current product content:

Name	Type	Description	Dimension	Units	Range
fire mask	8 bit integer	Fire mask M-B	3200 x 768	unitless	0 - 9
algorithm QA	32 bit Integer	Fire algorithm QA mask	3200 x 768	unitless	0 - 31
FP_line	16 bit Integer	Fire pixel line M-B	Sparse data array 0 M-bM-^@M-^S N	unitless	0 - 768
FP_sample	16 bit Integer	Fire pixel sample	Sparse data array 0 M-bM-^@M-^S N	unitless	0 M-bM-^@M-^S 3200
FP_latitude	32 bit Float	Fire pixel latitude	Sparse data array 0 M-bM-^@M-^S N	degrees	-90 - 90
FP_longitude	32 bit Float	Fire pixel longitude	Sparse data array 0 M-bM-^@M-^S N	degrees	-180 - 180
FP_power	32 bit Float	Fire radiative power	Sparse data array 0 M-bM-^@M-^S N	MW	0 - 5000
FP_confidence	8 bit Integer	Fire detection confidence	Sparse data array 0 M-bM-^@M-^S N	%	0 M-bM-^@M-^S 100
FP_land	8 bit Integer	Land pixel flag	Sparse data array 0 M-bM-^@M-^S N	unitless	1 M-bM-^@M-^S land 0 M-bM-^@M-^S water
18 FP diagnostic variables	See netCDF4 metadata	Variables to describeM-B observing and environmental conditions, and results of algorithm tests	Sparse data array 1 M-bM-^@M-^S N	See netCDF4 metadata	See netCDF4 metadata
* N is a dimension of sparse data array; defined in M-bM-^@M-^\nfireM-bM-^@M-^] variable

M-B

Added variable:

FP_PersistentAnomalyCategory

8 bit Integer

Persistent industrial or nature source

Sparse data array 0 M-bM-^@M-^S N

unitless

0 M-bM-^@M-^S 5 M-B

M-B

M-B

CurrentM-B QA Mask (4 bytes for each pixel in the granule)

Bits	M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B Description
0-1	Surface Type (water=0, coastal=1, land=2)
2	On-ground bowtie deletion zone
3	Atmospheric correction (reserved for future use)
4	Day/Night (daytime = 1, nighttime = 0)
5	Potential fire (0/1)
6	N/A
7-10	Background window size parameter
11	Fire Test 1 valid (0 - No, 1 - Yes)
12	Fire Test 2 valid (0 - No, 1 - Yes)
13	Fire Test 3 valid (0 - No, 1 - Yes)
14	Fire Test 4 valid (0 - No, 1 - Yes)
15	Fire Test 5 valid (0 - No, 1 - Yes)
16	Fire Test 6 valid (0 - No, 1 - Yes)
17-19	N/A
20	Adjacent clouds (0/1)
21	Adjacent water (0/1)
22-23	Sun Glint Level (0-3)
24	Sun glint rejection
25	False Alarm 1 (excessive rejection of legitimate background pixels)
26	False Alarm 2 (water pixel contamination)
27	Amazon forest-clearing rejection test
28	Water pixel rejection due to land/coastal contamination in background
29-31	N/A

M-B

Persistent anomaly category is added in previously not used bits:

Bits	M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B M-B Description
29-31	Persistent anomaly category

M-B

The following is added:

FP_PersistentAnomalyCategory = 3, 3, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;

011 is put in bits 29-31 for four pixels in this granule

Contact Information for Further Information: SPSD User Services at SPSD.UserServices@noaa.gov.M-B

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