SISTER

Space-based Imaging Spectroscopy and Thermal pathfindER

This repository contains code for implementing prototype algorithm workflows for the Space-based Imaging Spectroscopy and Thermal pathfindER (SISTER).

This repository is under active development and currently contains code for preprocessing imaging spectroscopy data from airborne and spaceborne sensors for input into higher level algorithms including atmospheric, topographic and BRDF correction algorithms.

Installation

We recommend installing the libary and its dependencies in a conda environment.

To create and activate a new environment run:

conda create -n sister python=3.8
source activate sister

Next install gdal:

conda install  gdal

To install the library, clone:

git clone https://github.com/EnSpec/sister.git

and install with pip:

pip install ./sister

Examples

PRISMA HDF to ENVI

The following code takes as input a PRISMA L1 radiance image along with ESA Copernicus DEM tiles and exports three ENVI formated files:

1. Merged VNIR+SWIR radiance datacube
2. Location datacube (longitude, latitude, altitude)
3. Observables datacube (sensor, solar geometry......)

PRISMA Algorithm Workflow

import os
from sister.sensors import prisma

l1_zip  = '/data/prisma/PRS_L1_STD_OFFL_ 20200621003500_20200621003505_0001.zip'
out_dir = '/data/prisma/rad/'
temp_dir =  '/data/temp/'
elev_dir = 'https://copernicus-dem-30m.s3.amazonaws.com/'

prisma.he5_to_envi(l1_zip,
			out_dir,
			temp_dir,
			elev_dir,
			shift = './data/prisma/PRISMA_Mali1_wavelength_shift_surface_smooth.npz',
			rad_coeff = './data/prisma/PRS_Mali1_radcoeff_surface.npz',
			match= True,
			proj = True)