VNP14IMGTDL_NRT

Short Name: VNP14IMGTDL_NRT

Product Title: VIIRS I Band 375 m Active Fire Product 1NRT (Vector data)

DOI:10.5067/FIRMS/VIIRS/VNP14IMGT.NRT.001.

Links to Download Data: https://earthdata.nasa.gov/active-fire-data

Long Name: VIIRS I Band 375 m Active Fire locations NRT (Vector data) distributed by LANCE FIRMS

Summary

Near Real-Time (NRT) Suomi National Polar-orbiting Partnership Visible Infrared Imaging Radiometer Suite (SNPP/VIIRS) Active Fire detection product is based on that instrument's 375 m nominal resolution data. Compared to other coarser resolution (≥1km) satellite fire detection products, the improved 375 m data provide greater response over fires of relatively small areas, as well as improved mapping of large fire perimeters. Consequently, the data are well suited for use in support of fire management (e.g., near real-time alert systems), as well as other science applications requiring improved fire mapping fidelity. The 375 m product complements the baseline SNPP/VIIRS 750 m active fire detection and characterization data, which was originally designed to provide continuity to the existing 1 km Earth Observing System Moderate Resolution Imaging Spectroradiometer (EOS/MODIS) active fire data record. Due to frequent data saturation issues, the current 375 m fire product provides detection information only with no sub-pixel fire characterization.

VNP14IMGTDL_NRT are available in the following formats: TXT, SHP, KML, WMS. These data are also provided through the LANCE FIRMS Fire Email Alerts. Please note only the TXT and SHP files contain all the attributes.

Coverage: Global
Spatial Resolution: 375 m
Projection: WGS84

Attribute fields

Attribute fields
Attribute
Short Description
Long Description
Latitude Latitude Center of nominal 375 m fire pixel
Longitude Longitude Center of nominal 375 m fire pixel
Bright_ti4 Brightness temperature I-4 VIIRS I-4 channel brightness temperature of the fire pixel measured in Kelvin.
Scan Along Scan pixel size The algorithm produces approximately 375 m pixels at nadir. Scan and track reflect actual pixel size.
Track Along Track pixel size The algorithm produces approximately 375 m pixels at nadir. Scan and track reflect actual pixel size.
Acq_Date Acquisition Date Date of VIIRS acquisition.
Acq_Time Acquisition Time Time of acquisition/overpass of the satellite (in UTC).
Satellite Satellite N= Suomi-National Polar-orbiting Partnership (SNPP)
Confidence Confidence

This value is based on a collection of intermediate algorithm quantities used in the detection process. It is intended to help users gauge the quality of individual hotspot/fire pixels. Confidence values are set to low, nominal and high. Low confidence daytime fire pixels are typically associated with areas of sun glint and lower relative temperature anomaly (<15K) in the mid-infrared channel I4. Nominal confidence pixels are those free of potential sun glint contamination during the day and marked by strong (>15K) temperature anomaly in either day or nighttime data. High confidence fire pixels are associated with day or nighttime saturated pixels.

Please note: Low confidence nighttime pixels occur only over the geographic area extending from 11deg E to 110 deg W and 7 deg N to 55 deg S. This area describes the region of influence of the South Atlantic Magnetic Anomaly which can cause spurious brightness temperatures in the mid-infrared channel I4 leading to potential false positive alarms. These have been removed from the NRT data distributed by FIRMS.

Version Version (Collection and source) Version identifies the collection (e.g. VIIRS Collection 1) and source of data processing: Near Real-Time (NRT suffix added to collection) or Standard Processing (collection only).
"1.0NRT" - Collection 1 NRT processing.
"1.0" - Collection 1 Standard processing.
Bright_ti5 Brightness temperature I-5 I-5 Channel brightness temperature of the fire pixel measured in Kelvin.
FRP Fire Radiative Power

FRP depicts the pixel-integrated fire radiative power in MW (megawatts). Value set to 0 as FRP for VIIRS I Band is not yet available.

DayNight Day or Night

D= Daytime fire, N= Nighttime fire

Related Products

To be updated

Data Acknowledgement

Data Acknowledgement

This data set was provided by LANCE FIRMS operated by NASA/GSFC/ESDIS with funding provided by NASA/HQ

For Shape Files:

NASA Near Real-Time VNP14IMGTDL_NRT VIIRS 375 m Active Fire Detections (SHP format). Data set. Available on-line [https://earthdata.nasa.gov/active-fire-data]

For Text Files:

NASA Near Real-Time VNP14IMGTDL_NRT VIIRS 375 m Active Fire Detections (TXT format). Data set. Available on-line [https://earthdata.nasa.gov/active-fire-data]

For KML Files:

NASA Near Real-Time VNP14IMGTDL_NRT VIIRS 375 m Active Fire Detections (KML format). Data set. Available on-line [https://earthdata.nasa.gov/active-fire-data]

For WMS Files:

NASA Near Real-Time VNP14IMGTDL_NRT VIIRS 375 m Active Fire Detections (WMS format). Data set. Available on-line [https://earthdata.nasa.gov/active-fire-data]

Data Citation

Schroeder, W., Oliva, P., Giglio, L., & Csiszar, I. A. (2014). The New VIIRS 375 m active fire detection data product: algorithm description and initial assessment. Remote Sensing of Environment, 143, 85-96. doi:10.1016/j.rse.2013.12.008 PDF

Near Real-Time vs Standard Products

Near Real-Time vs Standard Products

The VIIRS 375 m NRT products (VNP14IMGTDL_NRT) produced in near real-time by the Land, Atmosphere Near real-time Capability for EOS (LANCE) and may be subject to geo-location errors or re-processing. The NASA standard VIIRS fire products will be available in 2017.

LANCE processes data as soon as they are downlinked from satellites or transmitted from ground stations, generally within 30 minutes to two hours after satellite observation. Routines used to derive Level 2 products, such as fire, snow, and sea ice products, do not make use of ancillary data and therefore their codes are identical to the ones used in standard operations.

Generally, the difference between NRT and standard products is that the NRT data are subject to geolocation errors or reprocessing. Usually the geolocational errors are minimal (less than 100 meters), however, there are situations, particularly before and after spacecraft maneuvers and during space weather events, when the difference can increase up to several kilometers.

Known Issues

Known Issues

To be updated

Last Updated: Jan 31, 2017 at 1:12 PM EST

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