In lbusett/MODIStsp: Find, Download and Process MODIS Land Products Data

Single-band outputs

Output raster files are saved in specific subfolders of the main output folder. In particular, a separate subfolder is created for each processed original MODIS layer, Quality Indicator or Spectral Index. Each subfolder contains one image for each processed date, created according to the following naming conventions:

myoutfolder/"ProdName"/"Layer"/"ProdCode"_"Layer"_"YYYY"_"DOY"."ext"

, where:

• ProdName is a short name describing the MODIS product from which the datasets were derived (e.g., VI_16Days_1Km_v61);
• Layer is a short name describing the dataset (e.g., b1_Red, NDII, UI);
• ProdCode is the code name of the MODIS product from which the image was derived (e.g., MOD13Q1 - Note that if you choose to process both "Terra" and "Aqua" data, data coming from either platform will be placed in the same folder and you will have for example both "MOD13Q1..." and "MYD13Q1..." files in the output folder);
• YYYY and DOY correspond to the year and DOY (Day of the Year) of acquisition of the original MODIS image;
• ext is the file extension (.tif for GTiff outputs, or .dat for ENVI outputs).

So, for example, if you process layers "NDVI" and "EVI" for MODIS product MOD13A2 you will find the resulting GTiff of ENVI output single-date rasters in:

/your_out_folder/VI_16Days_1Km_v61/NDVI/

and

/your_out_folder/VI_16Days_1Km_v61/EVI/

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Virtual multi-band outputs

ENVI and/or GDAL virtual time series files and RasterStack RData objects are instead stored in the "Time_Series" subfolder if required.

Naming conventions for these files is as follow:

<path_of_out_folder>/Time_Series/<vrt_type>/<Sensor>/<Layer>/<ProdCode>_<Layer>_<StartDOY>_<StartYear>_<EndDOY>_<EndYear>_<suffix>.<ext> 

, where:

• <vrt_type> indicates the type of virtual file ("RData", "GDAL" or "ENVI_META");
• <Sensor> indicates to which MODIS sensor the time series belongs ("Terra", "Aqua", "Mixed" or "Combined" (for MCD* products));
• <Layer> is a short name describing the dataset (e.g., "b1_Red", "NDII", "UI");
• <ProdCode> is the code name of the MODIS product from which the image was derived (e.g., "MOD13Q1");
• <StartDOY>, <StartYear>, <EndDOY> and <EndYear> indicate the temporal extent of the time serie created;
• <suffix> indicates the type of virtual file ("ENVI", "GDAL" or "RData");
• <ext> is the file extension (".vrt" for GDAL virtual files, "META" for ENVI meta files or "RData" for R raster stacks).

So, for example, if you process layer "NDVI" for MODIS product MOD13A2 and platform "Terra", and ask to create "R rasterStacks" and "GDAL vrt" time series you will find the resulting GTiff virtual files in:

/your_out_folder/VI_16Days_1Km_v61/Time_Series/RData/Terra/NDVI

and

/your_out_folder/VI_16Days_1Km_v61/Time_Series/GDAL/Terra/NDVI

lbusett/MODIStsp documentation built on July 19, 2024, 10:34 p.m.