- Both the Landsat and Sentinel-2 calibration team have been putting effort on radiometric and geometric calibration so that their bands are compatible (Barsi et al., 2017). However small adjustment is still needed (Barsi et al., 2017, Chastain et al., 2019, Claverie el al., 2018).
- Transformation coefficients based on (Chastain et al., 2019)
var bound = ee.Geometry.Polygon([
[[35.96060746534647,33.815740435596645], [36.00472443922342,33.815740435596645], [36.00472443922342,33.85366939280121], [35.96060746534647,33.85366939280121], [35.96060746534647,33.815740435596645]]
]);
var bandIn = ['B2','B3','B4','B5','B6','B7'];
var bandOut = ['blue','green','red','nir','swir1','swir2'];
//Example images of S2 and L8
var imgS2SR = ee.Image('COPERNICUS/S2_SR/20181107T082129_20181107T082732_T36SYC').select(bandIn,bandOut).clip(bound);
var imgL8SR = ee.Image('LANDSAT/LC08/C01/T1_SR/LC08_174036_20181107').select(bandIn,bandOut).clip(bound);
var interceptsL8 = [-0.0107,0.0026,-0.0015,0.0033,0.0065,0.0046];
var slopesL8 = [1.0946,1.0043,1.0524,0.8954,1.0049,1.0002];
var imgL8SR_bandadj = ee.Image(imgL8SR.multiply(slopesL8).add(interceptsL8).float().copyProperties(imgL8SR)).set('system:time_start',imgL8SR.get('system:time_start'))
print(imgL8SR_bandadj)
Map.centerObject(bound,12)
var visParams = {bands: ['red','green','blue'], min:0, max: 3500};
Map.addLayer(imgL8SR, visParams, 'imgL8SR 30m');
Map.addLayer(imgS2SR, visParams, 'imgS2SR 10m');
Map.addLayer(imgL8SR_bandadj, visParams, 'imgL8SR_bandadj');
- Before Band Adjustment.
.
- After Band Adjustment.
.
- Barsi, J.A., Alhammoud, B., Czapla-Myers, J., Gascon, F., Haque, M.O., Kaewmanee, M., Leigh, L., Markham, B.L., 2018. Sentinel-2A MSI and Landsat-8 OLI radiometric cross comparison over desert sites. European Journal of Remote Sensing 51, 822–837. https://doi.org/10.1080/22797254.2018.1507613
- Chastain, R., Housman, I., Goldstein, J., Finco, M., Tenneson, K., 2019. Empirical cross sensor comparison of Sentinel-2A and 2B MSI, Landsat-8 OLI, and Landsat-7 ETM+ top of atmosphere spectral characteristics over the conterminous United States. Remote Sensing of Environment 221, 274–285. https://doi.org/10.1016/j.rse.2018.11.012
- Claverie, M., Ju, J., Masek, J.G., Dungan, J.L., Vermote, E.F., Roger, J.-C., Skakun, S.V., Justice, C., 2018. The Harmonized Landsat and Sentinel-2 surface reflectance data set. Remote Sensing of Environment 219, 145–161. https://doi.org/10.1016/j.rse.2018.09.002