g++ -c hdf2ndvi.cpp\r\ng++ -c enhance_gdal.cpp\r\ng++ -o hdf2ndiv hdf2ndvi.o enhance_gdal.o -lgdal\r\n<\/code><\/pre>\nand then it\u2019s successfully complied.<\/p>\n
Usage<\/h1>\n
##dealing with a single file
\ntype:<\/p>\n
.\/hdf2ndiv filename.hdf\r\n<\/code><\/pre>\nand you\u2019ll see:<\/p>\n
computing filename.hdf...\r\n<\/code><\/pre>\nafter finished, you\u2019ll get filename.hdf_NDVI.tiff<\/em> in the same folder<\/p>\ndealing with multiple files<\/h2>\n
If the files to be computed in the same folder.
\nYou can type:<\/p>\n
.\/hdf2ndvi *.hdf\r\n<\/code><\/pre>\nIf you want to compute all the files in the folders and subfolders,
\nyou can use xargs<\/code>:<\/p>\nfind . -name \".hdf\" -print0 | xargs -0 .\/hdf2ndvi\r\n<\/code><\/pre>\nchange band used<\/h2>\n
This program defaultly regard band0(band is counted from 0) as Red Band, and regard band1 as NIR(near infrared red) band. If you want to change the default value, for instance, set band-4 as NIR band and band-0 as Red Band, you can do like this:<\/p>\n
.\/hdf2ndvi filename.hdf -red 0 -nir 4\r\n<\/code><\/pre>\nand you\u2019ll get file: filename.hdf_NDVI.tiff<\/em> computed from band4 and band0<\/p>\nAlgorithm<\/h1>\n
The NDVI is computed as following:<\/p>\n