NDVI Extractor
Mosaics several scenes of Landsat 7 images, clips it based on a study region and computes Normalized Difference Vegetation Index (NDVI), and uploads the results to Clowder.
Input : A zip folder - earth-sundist.csv, zipped study region shapefile (Boundary.zip), two folders - Scene1 - (tiff files for band 3 and band 4, MTL file) and Scene2 (tiff files for band 3 and band 4, MTL file)
Output : A tiff file
Details provided by the student:-
1. This model currently is only works for Landsat 7. We need to change some parameters to make it work for Landsat 8.
2. For the solar angle, you can get it from metadata MTL file.
GROUP = IMAGE_ATTRIBUTES
CLOUD_COVER = 0.00
IMAGE_QUALITY = 9
SUN_AZIMUTH = 155.03337616
SUN_ELEVATION = 39.54882089
2. For the earth-sun distance, first you need to find date of year in the metadata MTL file:
GROUP = L1_METADATA_FILE
GROUP = METADATA_FILE_INFO
ORIGIN = "Image courtesy of the U.S. Geological Survey"
REQUEST_ID = "0101412026211_00196"
LANDSAT_SCENE_ID = "LE70230322000284EDC00"
FILE_DATE = 2014-12-03T03:44:34Z
STATION_ID = "EDC"
PROCESSING_SOFTWARE_VERSION = "LPGS_12.5.0"
DATA_CATEGORY = "NOMINAL"
3. Then you refer to the paper to get earth-sun distance from Table 6. (Smruti:- I converted .xls file of this to csv and is in the zipped input sample file.)