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MODIS values too high after HDF4 to TIFF conversion

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0

after converting MODIS NDVI and EVI (in HDF4 format) to tifs the values seem way too high (e.g. 2e+07), even after the multiplication with the scale factor (0.0001).
As I can't access the data before the conversion, I'm not sure if the data changed or if the values are just generally too high. Can I just delete the last few digits (which are all zero anyways) or is there a mistake in my conversion?

Here is my code for the EVI-conversion:

i = 1
for (i in 1:96)
 # Get a list of sds names
 sds <- get_subdatasets(files_evi[i])
 # Isolate the name of the first sds
 filename <- names_evi[i]
 gdal_translate(sds[2], dst_dataset = filename)
 # Load the Geotiff created into R
 r <- raster(filename)
 path <- "C:/xxx/MODIS/EVI/"
 path <- paste(path, filename)
 writeRaster(r, path, format="GTiff", overwrite=TRUE)

Any suggestions on how to fix this or how to access the data in a different way?

modis hdf

share|improve this question

asked Apr 8 at 13:45

HelenHelen

11

New contributor

Helen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

after converting MODIS NDVI and EVI (in HDF4 format) to tifs the values seem way too high (e.g. 2e+07), even after the multiplication with the scale factor (0.0001).
As I can't access the data before the conversion, I'm not sure if the data changed or if the values are just generally too high. Can I just delete the last few digits (which are all zero anyways) or is there a mistake in my conversion?

Here is my code for the EVI-conversion:

i = 1
for (i in 1:96)
 # Get a list of sds names
 sds <- get_subdatasets(files_evi[i])
 # Isolate the name of the first sds
 filename <- names_evi[i]
 gdal_translate(sds[2], dst_dataset = filename)
 # Load the Geotiff created into R
 r <- raster(filename)
 path <- "C:/xxx/MODIS/EVI/"
 path <- paste(path, filename)
 writeRaster(r, path, format="GTiff", overwrite=TRUE)

Any suggestions on how to fix this or how to access the data in a different way?

modis hdf

share|improve this question

asked Apr 8 at 13:45

HelenHelen

11

New contributor

Helen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

after converting MODIS NDVI and EVI (in HDF4 format) to tifs the values seem way too high (e.g. 2e+07), even after the multiplication with the scale factor (0.0001).
As I can't access the data before the conversion, I'm not sure if the data changed or if the values are just generally too high. Can I just delete the last few digits (which are all zero anyways) or is there a mistake in my conversion?

Here is my code for the EVI-conversion:

i = 1
for (i in 1:96)
 # Get a list of sds names
 sds <- get_subdatasets(files_evi[i])
 # Isolate the name of the first sds
 filename <- names_evi[i]
 gdal_translate(sds[2], dst_dataset = filename)
 # Load the Geotiff created into R
 r <- raster(filename)
 path <- "C:/xxx/MODIS/EVI/"
 path <- paste(path, filename)
 writeRaster(r, path, format="GTiff", overwrite=TRUE)

Any suggestions on how to fix this or how to access the data in a different way?

modis hdf

share|improve this question

asked Apr 8 at 13:45

HelenHelen

11

New contributor

Helen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

i = 1
for (i in 1:96)
 # Get a list of sds names
 sds <- get_subdatasets(files_evi[i])
 # Isolate the name of the first sds
 filename <- names_evi[i]
 gdal_translate(sds[2], dst_dataset = filename)
 # Load the Geotiff created into R
 r <- raster(filename)
 path <- "C:/xxx/MODIS/EVI/"
 path <- paste(path, filename)
 writeRaster(r, path, format="GTiff", overwrite=TRUE)

share|improve this question

asked Apr 8 at 13:45

HelenHelen

11

New contributor

Helen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked Apr 8 at 13:45

HelenHelen

11

New contributor

Helen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked Apr 8 at 13:45

HelenHelen

11

New contributor

Helen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked Apr 8 at 13:45

HelenHelen

11