yuanzhangao/ndvi_satellitepixel_extraction

The repository is a duplicate of the local folder which contains codes created by Yuanzhan Gao ([email protected]) to conduct NDVI pixel value extractions on NASA's satellite data. Please see the README file for more information.

NDVI extraction (Python 3.10)

Install

-- pip install gdal (need to download corresponding wheel file to download; check https://www.youtube.com/watch?v=8iCWUp7WaTk&t=136s; import using osgeo)
-- pip install pymodis
-- pip install pandas
-- pip install shapely
-- pip install pyproj

Usage

Extract NDVI values for all districts of Punjab Province of Pakistan (36 in total) from fiscal year 2006 to fisal year 2014. A fiscal year of year XXXX lasts from July 3rd/4th of XXXX to June 17th/18th of XXXX+1

4 files are relevant (Run sequentially in listed order):

1) NDVI_util.py (contain utility functions to assist pixel coordinate calculations);
2) tile_pixel_identification.py (for tiles (h24v5), (h24v6), (h23v5), which we know contain all pixels for Punjab, we classify all pixels' belonging to particular district)
3) NDVI_indexAccess_Implementation.py (download h24v5, h24v6, h23v5 hdf files from MODIS dataset and retrieve pixels obtained from tile_pixel_identification above)
4) NDVI_To_Excel.py (convert the result NDVI array to excel file)

For more details please see in-file comments.

Contact:

If you have additional question, please contact Yuanzhan Gao at [email protected]