Geoscience Reference
In-Depth Information
Land cover
Water
Evergreen Needleleaf forest
Evergreen Broadleaf forest
Deciduous Needleleaf forest
Deciduous Broadleaf forest
Mixed forest
Closed shrublands
Open shrublands
Woody savannas
Savannas
Grasslands
Permanent wetlands
Croplands
Urban and built-up
Cropland/Natural vegetation mosaic
Snow and ice
Barren or sparsely vegetated
0
250
500 km
Fig. 14.9
MODIS land cover product (MCD12Q1) with color table
We apply this color table to the first subdataset of the MCD12Q1 HDF4 file using
the final version of our
addct
utility. The result is shown in Fig.
14.9
, where we
used QGIS to add a scalebar and legend.
addct -ct modis_ct.txt HDF4_EOS:EOS_GRID:"MCD12Q1.A2012001.
→
h18v03.051.2013178170150.hdf":MOD12Q1:Land_Cover_Type_1
→
-of PNG band1.png
14.3.7 Create Cloud Mask Based on Landsat QA
Landsat 8 products are provided with a 16-bit quality GeoTIFF image (BQA). This
single band image provides information on the conditions in which the scenes have
been acquired. For instance, the four most significant bits are related to cloud/cirrus
detection, i.e. bits 14-15 are related to cloud detection and bits 12-13 to cirrus
detection (see Fig.
14.10
). Each pair of bits can have four different values. The values
correspond to the confidence with which a cloud/cirrus condition was detected
23
:
00 Algorithm did not determine the status of this condition;
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