Evaluation of updated JXAM5 snow cover extent product using ground based snow depth information
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1 2 nd International Satellite Snow Product Intercomparison Workshop ISSPI-2 University Memorial Center (UMC), University of Colorado Boulder, September 2015 Evaluation of updated JXAM5 snow cover extent product using ground based snow depth information Masahiro Hori (JAXA) Konosuke Sugiura (Univ. of Toyama) Tomonori Tanikawa (JAXA) Teruo Aoki (MRI) Katsuyuki Kuchiki (MRI) Masashi Niwano (MRI) and Hiroyuki Enomoto (NIPR)
2 Outline Snow Cover Extent (SCE) Products in JAXA Technical Specification of SCE Products Processing Flowchart Examples of SCE Results and SnowPEx Conversion Updates of JXAM5 Snow Cover Extent Validation Protocol and Reference Data Validation Results Summary
3 Snow Cover Extent Products in JAXA Three SCE products (available on JASMES web) Global SCE derived from MODIS spanning from 2000 to 2015 [5km, daily, half-month, monthly] [Algorithm: JXM10, use 10 channels of MODIS] Regional (around Japan) SCE derived from MODIS spanning from 2003 to 2015 [500m, daily, weekly, half-month, monthly] [Algorithm: JXM10] Global (currently excl. the Antarctica) SCE derived from AVHRR and MODIS spanning from 1979 to 2015 [5km, daily, weekly, half-month] [Algorithm: JXAM5, use only the five channels same as AVHRR]
4 Geo-stational Polar orbiter Sensor AVHRR MODIS TIROS-N OCTS/GLI/SGLI Optical sensors used to generate JXAM5 SCE Optical sensors in the past and future ( ) NOAA-07 NOAA-09 NOAA-11 NOAA/AVHRR series ADEOS/OCTS NOAA-14 NOAA-18 NOAA-16 ADEOS-II/GLI ADEOS series (OCTS, GLI) TERRA/MODIS AQUA/MODIS operation continuing by FO sensors MODIS series SUOMI NPP / VIIRS MODIS-FO GCOM-C/SGLI GCOM-C2/SGLI GCOM-C3/SGLI GCOM-C/SGLI (series) GMS HIMAWARI-8 号 HIMAWARI-9 号 New gene. GMS series 4
5 Technical Specification of SCE Product [JXAM5] Product Name : Snow Cover Extent for Climate Studies Sensor and applied spectral channels : AVHRR + MODIS (5CHs of AVHRR) Temporal Characteristics : Period (Start End) : (-2000:AVHRR, 2000-:MODIS) Temporal resolution (1 day, 1 week,..) : 1 day, 1 week, half month Spatial Characteristics Spatial resolution / Pixel size : 0.05 (approx. 5km) 7200x3601 pix Spatial Coverage : global (but Antarctic SCE is not good) Map Projection / Datum : Equirectangular (lat/lon) projection If applicable: Cloud screening Algorithm : Threshold tests & Temporal filtering If applicable: Valid / non-valid areas Invalid/masked areas : Ocean and Antarctic areas are not valid Product Format : HDF4 and binary + ascii (for snow area) Products accessible at Available through JASMES website (GHRM5C) Contact Person Name : Masahiro Hori (EORC/JAXA) hori.masahiro@jaxa.jp
6 Analysis Results (Examples) Snow Extent Binary (SEB) & Valid Area (VAA) Valid area Mar.09, 2012 Daily SE Binary Map (Original Flag) CSF _M5C_GLBOD01D_SNWFG_EQ05KM_1h9 Out of range (Antarctica) Out of range (Sea) Valid Area Definition (SnowPEx Format) JXAM5_V01_VAA_SNOWPEX Mar.09, 2012 Snow No snow Clouds Polar Night Not Valid (Sea) No satellite data Mar.5-11,2012 Snow No snow Clouds Polar Night Not Valid (Sea) No satellite data Daily SE Binary Map (SnowPEx Format) JXAM5_V01_SEB_ _D01_MAX Weekly SEB Map (SnowPEx Format) JXAM5_V01_SEB_ _D07_MAX
7 Slide from ISSPI-1 (2014): Validation results User s and Producer s Accuracy of JASMES SCE (and Wet SCE) UA>PA -> Underestimation in melting season SCE s UA is nearly euqal to PA except for in the spring months. 7
8 Updates of JXAM5 Snow Cover Extent Ver. 1e9/1f9 (uploaded version) -> Ver. 1h9 (new) To increase accuracies in melting season, the detectability of wet snow (& cloud) is enhanced. Ver. 1e9/1f9 1h9 Ver. 1h9
9 Updates of JXAM5 Snow Cover Extent Ver. 1e9/1f9 (uploaded version) -> Ver. 1h9 (new) To increase accuracies in melting season, the detectability of wet snow (& cloud) is enhanced. Dense Vegetation Area (LAI: 1-3) Ver. 1e9/1f9 1h9 Ver. 1h9
10 Validation and Reference data (Modified Version) Validation Protocol for SCE (SCE & Wet SCE) Snow Cover Extent In-situ Snow Depth DAILY GLOBAL HISTORICAL CLIMATOLOGY NETWORK (GHCN-D) ftp://ftp.ncdc.noaa.gov/pub/data/ghcn/daily Comparison with in-situ snow depth & Tmax (GHCND obtained from NCDC/NOAA) Criteria for SCE Val.: vs. Comparisons were made using Weekly Composite Data. Criteria for Wet SCE Val.: if T max > 2.5 deg.c, Only data points at 1deg. lat-lon grids are used. if Snow Depth (SD) > 25mm, NN pixel -> Snow Covered NN pixel -> Wet Snow Non-snow Satellite In-situ (truth) Snow or Wet Snow SD>25mm or T max >2.5 C 4 Definitioin of the accuracies shown in this ppt Users accuracy (UA) = 1 /(1+2) (Commission error : Rate of correct answer) Producers accuracy (PA) = 1 /(1+3) (Omission error : Rate of snow detection)
11 Validation results (2015) User s and Producer s Accuracy of JASMES SCE (and Wet SCE) UA>PA -> Accuracies are improved but the underestimation in melting season remains. SCE s UA is nearly euqal to PA, and both accuracies are temporally stable. UA & PA of Wet SCE is high in melt seasons, but variable in JJA due to low snow pixel numbers. 11
12 Validation results (2015) User s and Producer s Accuracy of JASMES SCE (and Wet SCE) UA>PA -> Accuracies are improved but the underestimation in melting season remains. SCE s UA is nearly euqal to PA, and both accuracies are temporally stable. UA & PA of Wet SCE is high in melt seasons, but variable in JJA due to low snow pixel numbers. 12
13 Slide from ISSPI-1 (2014): Validation results User s and Producer s Accuracy of JASMES SCE (and Wet SCE) SCE s UA is nearly euqal to PA except for in the spring months. 13
14 Validation results (2015) User s and Producer s Accuracy of JASMES SCE and Wet SCE (WSCE) SCE s UAs are approx. 0.8 nearly euqal to PA, and both accuracies are temporally stable (expt in due to AN crossing time drifts). UA & PA of WSCE is
15 Validation results (2015) User s and Producer s Accuracy of JASMES SCE and Wet SCE (WSCE) Drift of the ascending node of NOAA series satellites SCE s UAs are approx. 0.8 nearly euqal to PA, and both accuracies are temporally stable (expt in due to AN crossing time drifts). UA & PA of WSCE is
16 Validation Results (2015) Summary of UA & PA JASMES SCE (Dry+Wet Snow) vs. GHCND (SD>25mm) [ ] JXAM5: Ver.1h9 JASMES WSCE (Wet Snow) vs. GHCND (T max >2.5deg.C) [ ] UA PA UA PA Season Ave Std Ave Std Ave Std Ave Std DJF MAM JJA SON Annual SCE: Annual averages (UA & PA) 0.8 High (UA & PA >0.8) in winter High UA & Moderate PA in spring Low in summer and autumn WSCE: Annual averages > 0.6 High in spring (>0.7) Moderate in summer ( ) Low in winter & fall ( ) 16
17 Commission Error [%] (1-UA) Validation results for January April June October 1h9, SD & Tmax sites
18 Omission Error [%] (1-PA) Validation results for January April June October 1h9, SD & Tmax sites
![Omission Error [%] (1-PA)](/docs-images/85/92068737/images/19-2.jpg "Validation results for")
19 Omission Error [%] (1-PA) Validation results for January April June GlobCover2009 (V2.3) October 1h9, SD & Tmax sites
20 Summary Binary files of global snow cover extent (SCE) products (JXAM5 and JXM10) have been uploaded to the SnowPEx ftp server. The algorithms employ conventional decision tree threshold tests including the discrimination between dry snow and wet snow. The algorithm for JXAM5 was updated this year to enhance the accuracies of SCE detection in melting season. Comparisons with in-situ snow depth (GHCND) indicate that SCE s UA/PA are about 0.80/0.78, whereas those of wet SCE are about 0.66/0.61. Annual values are temporally stable during Commission errors (1-UA) of SCE tend to be large at sourthern Scandinavia, Germany, and southern US regions in early to midwinter (Oct. & Jan.), while omission errors become large at the same regions in melting season (April) (clouds, vegetation?). Future works: further quality assessment of in-situ data sites (temporal & spatial uniformity) is necessary for the trend analysis. 20
21 Supplemental slides
![Technical specification of snow product [JXM10] Product Name : Snow Cover Extent for MODIS (snwcfr) Sensor and applied spectral channels : MODIS (10 channels) Temporal Characteristics : Period (Start](/docs-images/85/92068737/images/22-1.jpg "End) : 2000-2013 Temporal resolution (1 day, 1 week,..) : 1 day, 1 week, half month, monthly Spatial Characteristics Spatial resolution / Pixel size : 0.05 (approx.")
22 Technical specification of snow product [JXM10] Product Name : Snow Cover Extent for MODIS (snwcfr) Sensor and applied spectral channels : MODIS (10 channels) Temporal Characteristics : Period (Start End) : Temporal resolution (1 day, 1 week,..) : 1 day, 1 week, half month, monthly Spatial Characteristics Spatial resolution / Pixel size : 0.05 (approx. 5km) 7200x3601 pix Spatial Coverage : global and local around Japan Map Projection / Datum : Equirectangular (lat/lon) projection If applicable: Cloud screening Algorithm : Threshold tests & Temporal filtering If applicable: Valid / non-valid areas Invalid/masked areas : Ocean not validated (should be masked) Product Format : HDF4 and binary + ascii (for snow area) Products accessible at Contact Person Name : Masahiro Hori (EORC/JAXA) hori.masahiro@jaxa.jp
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