MODIS/Terra Calibrated Radiances 5-Min L1B Swath 250m V7
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https://cmr.earthdata.nasa.gov/search/concepts/C3861609263-LAADS.html
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资源简介：
The Terra MODIS (Moderate resolution Imaging Spectroradiometer) Level-1B (L1B) product includes calibrated and geolocated at-aperture radiances for 36 bands generated from MODIS Level-1A raw sensor counts. The radiances are provided in watts/m2/micrometer/steradian. The Terra MODIS L1B product is a set three datasets (MOD02QKM, MOD02HKM, and MOD021KM) that are produced to address the three spatial-resolution variations: 250 m, 500 m, and 1000 m.
This landing page describes the quarter-kilometer product with a short-name MOD02QKM. It provides calibrated radiances derived from the 250-m at-nadir visible band-1 and near-infrared band-2 that have central wavelengths at 0.645 µm and 0.858 µm, respectively. Each 250-m band has 40 detectors in the along-track direction. The MOD02QKM product contains the following two Science Data Sets (SDS) besides geolocation fields for latitude and longitude, quality flags, error estimates, etc.
<html>
<body>
<table>
<tr>
<th>SDS Variable</th>
<th>Long-name</th>
</tr>
<tr>
<td>EV_250_RefSB</td>
<td>Earth View 250M Reflective Solar Bands Scaled Integers</td>
</tr>
<tr>
<td>EV_250_RefSB_Uncert_Indexes</td>
<td>Earth View 250M Reflective Solar Bands Uncertainty Indexes</td>
</tr>
</table>
</body>
</html>
<br>
The v7.0 Terra MODIS MOD02QKM in netCDF4 format represents the most current version of this product that has undergone around half-a-dozen reprocessing cycles in the last 2.5 decades. Each 250-m swath granule or data-file temporally spans 5 minutes and its image dimensions measure 8,120 lines (along-track direction) by 5,416 samples (cross-track direction). The v7.0 collection’s data record starts from February 24, 2000 (2000–055). Consult the MODIS L1B User Guide to understand how to convert the per-pixel scaled integers to radiance or reflectance.
提供机构：
LAADS
