DNB Terrain Correction Slide Fire AZ William Straka

DNB Terrain Correction Slide Fire, AZ William Straka III 1

Background • IDPS Mx 8. 4 was implemented on 22 May, 2014 starting with the ~14: 40 GMT observation time. • One of the key features is Terrain Correction is implemented for the Day Night Band – The TC latitude/longitudes are variables in the GDNBO files and not a separate file. – This means thermal, NIR and DNB emissive sources should now match up in all regions • NDE provided test case over Iceland as so users could adjust their scripts/code accordingly. We wish to acknowledge their help in this – The nightly Mc. IDAS-V was ready as soon as the TC navigation was available within the GDNBO files

Test case • Test case is the Slide Fire in Arizona – Night time case from 0933 Z on 23 May 2014 was used • Arrow is located at roughly the center of the hot spot from the M 13 band (terrain corrected) and in the same place for all images • Slides 8 -9 have animations, so use slide show

23 May 2014, 0933 Z M 13 – 3. 9 mm Slide

23 May 2014, 0933 Z M 10 – 1. 6 mm

23 May 2014, 0933 Z DNB – Non. TC

23 May 2014, 0933 Z DNB –Terrain Corrected

23 May 2014, 0933 Z DNB non-TC, M 10, M 13

23 May 2014, 0933 Z DNB_TC, M 10, M 13

Observations • While test scene is cloud covered, the location of Slide Fire is clearly shifted from the M 10 and M 13, both which are terrain corrected, hot spots • The terrain corrected DNB geolocation shifts the fire inline with the hot spots indicated in the M 10 and M 13 band data

Conclusions • While test case was clouded over, it appears that the Terrain Corrected navigation correctly shifts fires inline with thermal observations. • Because it likely the Slide Fire will be burning for a few more days, hopefully it will be cloud free for better comparisons • Mc. IDAS-V 1. 5 beta appears to correctly use the terrain corrected navigation, if it is available. In addition it is backward compatible to data without the TC navigation.