MODIStsp_process_QA_bits

function used to extract quality indicator from MODIS aggregated
quality layers

Allows automating the creation of time series of rasters derived
from MODIS satellite land products data. It performs several typical
preprocessing steps such as download, mosaicking, reprojecting and resizing
data acquired on a specified time period. All processing parameters
can be set using a user-friendly GUI. Users can select which layers of
the original MODIS HDF files they want to process, which additional
quality indicators should be extracted from aggregated MODIS quality
assurance layers and, in the case of surface reflectance products,
which spectral indexes should be computed from the original reflectance
bands. For each output layer, outputs are saved as single-band raster
files corresponding to each available acquisition date. Virtual files
allowing access to the entire time series as a single file are also created.
Command-line execution exploiting a previously saved processing options
file is also possible, allowing users to automatically update time series
related to a MODIS product whenever a new image is available.
For additional documentation refer to the following article:
Busetto and Ranghetti (2016) <doi:10.1016/j.cageo.2016.08.020>.

Luigi Ranghetti

MODIStsp

Find, Download and Process MODIS Land Products Data

Lorenzo Busetto

Leah Wasser

Jeff Hanson

Babak Naimi

MODIStsp_process_QA_bits function

<dl><dt>out_filename</dt>
<dd><code>character</code> file name of the output raster files
containing QI values</dd>
<dt>in_source_file</dt>
<dd><code>character</code> name of the file created by MODIStsp
containing the data required to compute the quality indicator</dd>
<dt>bitN</dt>
<dd><code>character</code> position of the bits corresponding to the quality
indicator of interest (e.g., 0-1 = first two bits; 2-5: bits from 2 to 5,
etc.)</dd>
<dt>out_format</dt>
<dd>output format (ENVI or GTiff)</dd>
<dt>nodata_source</dt>
<dd><code>character</code> NoData values of the MODIS band containing
data from which the bit field corresponding to the quality indicator must
be extracted</dd>
<dt>nodata_qa_in</dt>
<dd><code>character</code> in NoData for quality bands ("255")</dd>
<dt>nodata_qa_out</dt>
<dd><code>character</code> out NoData for quality bands ("255")</dd>
<dt>compress</dt>
<dd><code>character</code> compression option for GTiff files</dd></dl>

Arguments

Lorenzo Busetto, phD (2017)
Luigi Ranghetti, phD (2017)

Author

MODIStsp helper function to compute Quality Indicators from HDF bit-field layers — MODIStsp_process_QA_bits

<dl>

<dt>out_filename</dt>
<dd><code>character</code> file name of the output raster files
containing QI values</dd>


<dt>in_source_file</dt>
<dd><code>character</code> name of the file created by MODIStsp
containing the data required to compute the quality indicator</dd>


<dt>bitN</dt>
<dd><code>character</code> position of the bits corresponding to the quality
indicator of interest (e.g., 0-1 = first two bits; 2-5: bits from 2 to 5,
etc.)</dd>


<dt>out_format</dt>
<dd>output format (ENVI or GTiff)</dd>


<dt>nodata_source</dt>
<dd><code>character</code> NoData values of the MODIS band containing
data from which the bit field corresponding to the quality indicator must
be extracted</dd>


<dt>nodata_qa_in</dt>
<dd><code>character</code> in NoData for quality bands ("255")</dd>


<dt>nodata_qa_out</dt>
<dd><code>character</code> out NoData for quality bands ("255")</dd>


<dt>compress</dt>
<dd><code>character</code> compression option for GTiff files</dd>

</dl>

MODIStsp_process_QA_bits: MODIStsp helper function to compute Quality Indicators from HDF bit-field layers

Description

Usage

Arguments

Author

Details