Andrew Johnston asjohnston-asf
asjohnston-asf
/ nisar_gcov_to_geotiff.py
Created
March 20, 2026 00:03
Convert backscatter data to geotiffs for each NISAR GCOV product in a given directory
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| import os | |
| from concurrent.futures import ProcessPoolExecutor | |
| from pathlib import Path | |
| from osgeo import gdal | |
| gdal.UseExceptions() | |
| os.environ['GDAL_NUM_THREADS'] = 'ALL_CPUS' | |
| os.environ['GDAL_DISABLE_READDIR_ON_OPEN'] = 'TRUE' |
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| import datetime | |
| import hashlib | |
| import json | |
| import os | |
| import requests | |
| session = requests.Session() |
asjohnston-asf
/ nisar_gcov_decomposition.py
Created
October 29, 2025 19:32
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| from osgeo import gdal, osr | |
| from nisar.products.readers import open_product | |
| # get the data bands | |
| gcov = open_product('NISAR_L2_PR_GCOV_045_107_A_031_4005_DHDH_A_20240621T144514_20240621T144551_T00410_N_F_J_001.h5') | |
| hhhh = gcov.getImageDataset(frequency='A', polarization='HHHH') | |
| hvhv = gcov.getImageDataset(frequency='A', polarization='HVHV') | |
| # compute your RGB pixel values here | |
| red = hhhh[:,:] |
asjohnston-asf
/ find_opera_disp_products.py
Last active
February 6, 2025 18:01
Find download URLs for OPERA DISP products in ASF non-production archive by product version and frame id
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| import requests | |
| def get_download_url(product: dict, protocol: str) -> str: | |
| if protocol not in ['https', 's3']: | |
| raise ValueError(f'Unknown protocol {protocol}; must be https or s3') | |
| for url in product['umm']['RelatedUrls']: | |
| if url['Type'].startswith('GET DATA') and url['URL'].startswith(protocol): | |
| return url['URL'] |
asjohnston-asf
/ coherence-notebook.ipynb
Created
December 2, 2022 21:41
"Search the GSSICB STAC Catalog" notebook for AGU 2022
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asjohnston-asf
/ gist:c252f6e393299bc4e0079f133de1ebbc
Last active
August 31, 2020 20:34
cmr query for average s1 ingest lag time
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| from statistics import mean | |
| from datetime import timedelta, datetime | |
| import requests | |
| from dateutil.parser import parse | |
| SESSION = requests.Session() | |
| def get_granules(day): |
asjohnston-asf
/ scrolling-cmr-search-for-urls.py
Created
August 18, 2020 18:14
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| from requests import Session | |
| search_url = 'https://cmr.earthdata.nasa.gov/search/granules' | |
| parameters = { | |
| 'scroll': 'true', | |
| 'provider': 'ASF', | |
| 'page_size': 2000, | |
| # set any search criteria here | |
| #'short_name': ['SENTINEL-1A_SP_GRD_HIGH','SENTINEL-1B_SP_GRD_HIGH','SENTINEL-1A_DP_GRD_HIGH','SENTINEL-1B_DP_GRD_HIGH'], |
asjohnston-asf
/ gist:0a94cd31bd0943a8eb85102b4cfaa2b3
Last active
February 5, 2020 19:05
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| @app.route(....) | |
| def list_zip_contents(): | |
| try: | |
| return do_it() | |
| except RemoteIoError as e: | |
| status_code = get_status_code(e) | |
| abort(status_code) | |
| except KeyError as e: | |
| return 'no such file...', 400 |
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| { | |
| "zip_url": "https://datapool.asf.alaska.edu/SLC/SA/S1A_IW_SLC__1SDV_20200127T193344_20200127T193411_030990_038F2E_9EF2.zip", | |
| "zip_filename": "S1A_IW_SLC__1SDV_20200127T193344_20200127T193411_030990_038F2E_9EF2.zip", | |
| "zip_size": 3799270867, | |
| "list_url": "https://unzip-test.asf.alaska.edu/SLC/SA/S1A_IW_SLC__1SDV_20200127T193344_20200127T193411_030990_038F2E_9EF2.zip/", | |
| "contents": [{ | |
| "filename": "S1A_IW_SLC__1SDV_20200127T193344_20200127T193411_030990_038F2E_9EF2.SAFE/", | |
| "size": 0, | |
| "url": "https://unzip-test.asf.alaska.edu/SLC/SA/S1A_IW_SLC__1SDV_20200127T193344_20200127T193411_030990_038F2E_9EF2.zip/S1A_IW_SLC__1SDV_20200127T193344_20200127T193411_030990_038F2E_9EF2.SAFE/" | |
| }, { |