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MODIS NDVI Climatology Analysis: Handling Missing Data and Comparative Study with AVHRR

This dataset examines the NDVI (Normalized Difference Vegetation Index) climatology derived from MODIS data, focusing on the challenges of missing pixels during the reprojection to a 500m geographic grid. The analysis covers a decade of NDVI data, comparing it with AVHRR climatology to understand differences and correlations. The results include regression analysis for multiple years of NDVI, offering insights into vegetation dynamics over time. This comprehensive study informs on agricultural monitoring and environmental assessments using remote sensing data.

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MODIS NDVI Climatology Analysis: Handling Missing Data and Comparative Study with AVHRR

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  1. Create NDVI climatology from MODIS 8/30/2012

  2. Missing pixels when re-project MODIS data to geographic grid (500m GVI) . • IDL> MODIS_MISSINGDATA,year=2011 • % npNP_total • row= 1 col= 1 missing= 0.204667 29291 14311570 • row= 1 col= 2 missing= 4.97341 748269 15045395 • row= 1 col= 3 missing= 5.01937 532680 10612489 • row= 1 col= 4 missing= 0.976292 97015 9937091 • row= 1 col= 5 missing= 0.0103311 1174 11363709 • row= 1 col= 6 missing= 2.36155 555021 23502404 • row= 1 col= 7 missing= 4.14692 1278892 30839545 • row= 1 col= 8 missing= 0.354189 73383 20718573 • row= 2 col= 1 missing= 0.00000 0 400058 • row= 2 col= 2 missing= 0.00196301 456 23229602 • row= 2 col= 3 missing= 0.00219357 240 10941074 • row= 2 col= 4 missing= 0.00000 0 2561291 • row= 2 col= 5 missing= 0.000112566 30 26650963 • row= 2 col= 6 missing= 0.000589340 192 32578809 • row= 2 col= 7 missing= 0.00000 0 34412910 • row= 2 col= 8 missing= 0.000857454 43 5014849 • row= 3 col= 1 missing= -NaN 0 0 • row= 3 col= 2 missing= 0.000904469 187 20675111 • row= 3 col= 3 missing= 1.36573e-05 1 7322086 • row= 3 col= 4 missing= 0.000418962 28 6683186 • row= 3 col= 5 missing= 0.000253120 58 22914065 • row= 3 col= 6 missing= 0.00447856 1481 33068701 • row= 3 col= 7 missing= 0.00648132 1631 25164612 • row= 3 col= 8 missing= 0.000348725 3 860276 • row= 4 col= 1 missing= 0.00201402 1 49652 • row= 4 col= 2 missing= 0.00509204 249 4889985 • row= 4 col= 3 missing= 0.000495517 15 3027144 • row= 4 col= 4 missing= 0.000214664 27 12577804 • row= 4 col= 5 missing= 1.78403e-05 6 33631695 • row= 4 col= 6 missing= 0.0420167 6648 15822267 • row= 4 col= 7 missing= 0.00409002 490 11980391 • row= 4 col= 8 missing= 0.00000 0 334 row= 5 col= 1 missing= 96.6667 116 120 row= 5 col= 2 missing= 0.00000 0 15980 row= 5 col= 3 missing= 0.000115569 23 19901582 row= 5 col= 4 missing= 0.00000 0 4030417 row= 5 col= 5 missing= 0.00000 0 26942123 row= 5 col= 6 missing= 0.00000 0 1775592 row= 5 col= 7 missing= 0.000892008 58 6502182 row= 5 col= 8 missing= 0.000120827 2 1655258 row= 6 col= 1 missing= 0.00000 0 10395 row= 6 col= 2 missing= -NaN 0 0 row= 6 col= 3 missing= 0.00777902 1757 22586406 row= 6 col= 4 missing= 0.00000 0 5096785 row= 6 col= 5 missing= 0.0382155 7667 20062538 row= 6 col= 6 missing= 6.29492e-05 1 1588583 row= 6 col= 7 missing= 0.0394888 2737 6931080 row= 6 col= 8 missing= 0.0649690 3695 5687330 row= 7 col= 1 missing= -NaN 0 0 row= 7 col= 2 missing= 0.00000 0 84 row= 7 col= 3 missing= 1.99290e-05 3 15053406 row= 7 col= 4 missing= 0.0487774 23 47153 row= 7 col= 5 missing= 0.000764750 67 8761035 row= 7 col= 6 missing= 0.00000 0 320672 row= 7 col= 7 missing= 2.83683e-05 3 10575175 row= 7 col= 8 missing= 1.64331e-05 2 12170557 row= 8 col= 1 missing= 0.00000 0 1339 row= 8 col= 2 missing= -NaN 0 0 row= 8 col= 3 missing= 0.00772733 382 4943491 row= 8 col= 4 missing= 0.0162774 2 12287 row= 8 col= 5 missing= 0.00000 0 770 row= 8 col= 6 missing= 0.0189155 3 15860 row= 8 col= 7 missing= -NaN 0 0 row= 8 col= 8 missing= 0.00420512 49 1165247

  3. Compare climatology of MODIS and AVHRR AVHRR 30 years mean NDVI MODIS 10-years mean NDVI Week 26

  4. Compare climatology of MODIS and AVHRR AVHRR 30 years mean NDVI MODIS 10-years mean NDVI Week 52

  5. NDVI climatology of MODIS and AVHRR CC: 0.91 ~ 0.94 NDmodis = a + b * NDavhrr

  6. Regression between Climatology (multiple years) mean NDVI from MODIS and AVHRR • Processing: • Re-projected MODIS 250m 16 days composed NDVI to 500m Geographic grid (same as GVH) for all periods from 2002 to 2012 • Created MODIS 500m NDVI climatology from 10-years data • Aggregated MODIS 500m NDVI climatology to 4km grid (calculate mean NDVI over 64 sub grids) • Compared MODIS and AVHRR climatology: multiple years averaged NDVI (see left) NDmodis = 0.01905 + 1.753 * NDavhrr

  7. Raw NDVI MODIS vs. AVHRR AVHRR 2011, week 2 MODIS 2011, period 1

  8. Raw NDVI MODIS vs. AVHRR AVHRR 2011, week 26 MODIS 2011, period 12

  9. Raw NDVI MODIS vs. AVHRR NOAA16: NDmodis = 0.1 + 1.38 * NDavhrr

  10. NOAA18: NDmodis = 0.09 + 1.40 * NDavhrr Raw NDVI MODIS vs. AVHRR

  11. Smoothed NDVI MODIS vs. AVHRR NOAA16: NDmodis = 0.03 + 1.65 * NDavhrr

  12. NOAA18: NDmodis = 0.03 + 1.67 * NDavhrr Smoothed NDVI MODIS vs. AVHRR

  13. Apply 10% down on NDVI on AVHRR SMN? With 10% down on AVHRR SMN Without 10% down on AVHRR SMN

  14. Photo Album by guow

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