Difference between revisions of "MODIS LST"
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MOD11A1 - MODIS Land Surface Temperature Product | MOD11A1 - MODIS Land Surface Temperature Product | ||
| − | 6/16/2009 - Peter and Karl meet re acquiring and projecting Sierra Nevada Data | + | == 6/16/2009 - Peter and Karl meet re acquiring and projecting Sierra Nevada Data == |
| − | Version 5 data seems to be complete on LPDAAC datapools ( | + | *Version 5 data seems to be complete (ie 2000 to 2009) on LPDAAC datapools (an ftp) |
| − | Data Size is 3 to 6 MB per granule. For Sierra, 3 granules, 9 years, 365 days = 30 to 60 GB | + | |
| − | Projected data is similar in size | + | *Data Size is 3 to 6 MB per granule. For Sierra, 3 granules, 9 years, 365 days = 30 to 60 GB |
| − | + | ||
| + | *We are using 1km because this is the native resolution | ||
| + | |||
| + | *Prior projection took 30 seconds. Assume swamped system takes 2 minutes per hdf file. 2 min, 9 years, 365 days | ||
| + | |||
| + | *Projected data is similar in size so total disk space = 60 and 120 GB | ||
| + | |||
| + | *Steps are 1) Catalog 2) Acquire 3) Project | ||
| + | |||
| + | *Current problem with search for projection - Peter is debugging(done!!) | ||
NASA data products homepage for LST [http://modis.gsfc.nasa.gov/data/dataprod/dataproducts.php?MOD_NUMBER=11] | NASA data products homepage for LST [http://modis.gsfc.nasa.gov/data/dataprod/dataproducts.php?MOD_NUMBER=11] | ||
Latest revision as of 16:03, 16 June 2009
MOD11A1 - MODIS Land Surface Temperature Product
6/16/2009 - Peter and Karl meet re acquiring and projecting Sierra Nevada Data
- Version 5 data seems to be complete (ie 2000 to 2009) on LPDAAC datapools (an ftp)
- Data Size is 3 to 6 MB per granule. For Sierra, 3 granules, 9 years, 365 days = 30 to 60 GB
- We are using 1km because this is the native resolution
- Prior projection took 30 seconds. Assume swamped system takes 2 minutes per hdf file. 2 min, 9 years, 365 days
- Projected data is similar in size so total disk space = 60 and 120 GB
- Steps are 1) Catalog 2) Acquire 3) Project
- Current problem with search for projection - Peter is debugging(done!!)
NASA data products homepage for LST [1] DAAC description [2]
| Science Data Sets (HDF Layers) | UNITS | BIT TYPE | FILL | VALID RANGE | MULTIPLY BY SCALE FACTOR |
|---|---|---|---|---|---|
| LST_Day_1km: Daily daytime 1km grid land surface temperature | Kelvin | 16-bit unsigned integer | 0 | 7500–65535 | 0.02 |
| QC_Day: Quality control for daytime LST and emissivity | Bit Field | 8-bit unsigned integer | See QA NOTE | 0–255 | na |
| Day_view_time: Time of daytime land surface temperature observation | Hours | 8-bit unsigned integer | 255 | 0–240 | 0.1 |
| Day_view_angle: View zenith angle of daytime land surface temperature | Degree | 8-bit unsigned integer | 255 | 0–130 | 1 (- 65) |
| LST_Night_1km: Daily nighttime 1km grid land surface temperature | Kelvin | 16-bit unsigned integer | 0 | 7500–65535 | 0.02 |
| QC_Night: Quality control for nighttime LST and emissivity | Bit Field | 8-bit unsigned integer | See QA NOTE | 0–255 | na |
| Night_view_time: Time of nighttime land surface temperature observation | Hours | 8-bit unsigned integer | 255 | 0–240 | 0.1 |
| Night_view_angle: View zenith angle of nighttime land surface temperature | Degree | 8-bit unsigned integer | 255 | 0–130 | 1 (-65) |
| Emis_31: Band 31 Emissivity | none | 8-bit unsigned integer | 0 | 1–255 | 0.0020 (+ 0.49) |
| Emis_32: Band 32 Emissivity | none | 8-bit unsigned integer | 0 | 1–255 | 0.0020 (+ 0.49) |
| Clear_day_cov: day clear sky coverage | None | 16-bit unsigned integer | 0 | 1–65535 | 0.00004 |
| Clear_night_cov: night clear sky coverage | None | 16-bit unsigned integer | 0 | 1–65535 | 0.00004 |
