MOD29P1D Local Attributes
Local attributes describe the data and provide summary data on the results of the sea ice algorithm. Two types of local attributes are reported: HDF predefined, and custom local attributes.
HDF Predefined Local Attributes
| Attribute Name | Reserved Label(s) | Definition | Sample Value |
| Label | long_name | Long name of the SDS | Sea ice by reflective characteristics |
| Unit | units | SI units of the data, if any | none |
| Format | format | How the data should be viewed in Fortran format notation | I3 |
| Coordinate system | coordsys | Coordinate system to use for the data | cartesian |
| Range | valid_range | Max and min values within a selected data range | 0-254 |
| Fill Value | _FillValue | Data used to fill gaps in the swath | 255 |
| Calibration | scale_factor scale_factor_err add_offset add_offset_err calibrated_nt |
Used if data are stored in calibrated form |
Custom Local Attributes
| Sea Ice by Reflectance | ||
| Attribute Name | Definition | Sample Value |
| missing_value | Coded integer used to indicate missing data | 0 |
| Sea Ice_pct | Areal coverage of sea ice (0-100) | 68 |
| Ocean_pct | Percentage of ocean in the tile | 57 |
| Cloud_pct | Percentage of cloud in the tile | 75 |
| Land_area_pct | Percentage of land in the tile | 43 |
| Key | Key to meaning of data | See pixel values. |
| Sea Ice by Reflectance SpatialQA | ||
| Attribute Name | Definition | Sample Value |
| Nominal_results | Percentage of nominal data in the tile | 14 |
| Abnormal_results | Percentage of abnormal data in the tile | 1 |
| Invalid_input | Percentage of invalid data in the tile | 85 |
| Cloud_obscured | Percentage of cloud in the tile | |
| Outside_relative_azimuth | Percentage of land in the tile | 0 |
| Key: | See MODIS Sea Ice Quality Assurance Fields for definition of bit values | |
| Ice Surface Temperature | ||
| Attribute Name | Definition | Sample Value |
| Key: | Key to meaning of data | See pixel values. |
| Ice Surface Temperature SpatialQA | ||
| Attribute Name | Definition | Sample Value |
| Nominal_results | Percentage of nominal data in the tile | 89 |
| Abnormal_results | Percentage of abnormal data in the tile | 1 |
| Invalid_input | Percentage of invalid data in the tile | 0 |
| Cloud_obscured | Percentage of cloud in the tile | 10 |
| Outside_relative_azimuth | Percentage of land in the tile | 0 |
| Key: | See MODIS Sea Ice Quality Assurance Fields for definition of bit values | |
| Sea Ice by IST | ||
| Attribute Name | Definition | Sample Value |
| missing_value | Coded integer used to indicate missing data | 0 |
| Cloud_cover | Percentage of cloud-obscured ocean | 91 |
| Ocean_percentage | Percentage of ocean in the tile | 93 |
| Sea_ice_percentage | Areal coverage of sea ice | 0 |
| No_decision | Percentage of no decision results | 1 |
| Invalid_input_data | Percentage of invalid data in the tile | 0 |
| Key | Key to meaning of data | See pixel values. |
| Combined Sea Ice | ||
| Attribute Name | Definition | Sample Value |
| Key: | Key to meaning of data | See pixel values. |
¹ These percentages are based on the total number of pixels in the swath (x dimensions * y dimensions).
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