Capitalize ASF and CDSE in --download-source choices and flow through code

README.md

@@ -93,15 +93,15 @@ To be even more explicit, you can use [`tee`](https://en.wikipedia.org/wiki/Tee_
 
 ## Generate an ARIA-S1-GUNW using CDSE for Sentinel-1 Download
 
-By default, Sentinel-1 SLC granules are downloaded from the [Alaska Satellite Facility (ASF)](https://asf.alaska.edu/). As an alternative, particularly suited for European users or those operating within the European cloud ecosystem, granules can be downloaded from the [Copernicus Data Space Ecosystem (CDSE)](https://dataspace.copernicus.eu/) by passing `--download-source cdse`. Metadata lookups and bounding box checks still use ASF, so a valid `~/.netrc` entry for `urs.earthdata.nasa.gov` remains required. Additionally, CDSE credentials must be configured as described in the *Additional setup* section above.
+By default, Sentinel-1 SLC granules are downloaded from the [Alaska Satellite Facility (ASF)](https://asf.alaska.edu/). As an alternative, particularly suited for European users or those operating within the European cloud ecosystem, granules can be downloaded from the [Copernicus Data Space Ecosystem (CDSE)](https://dataspace.copernicus.eu/) by passing `--download-source CDSE`. Metadata lookups and bounding box checks still use ASF, so a valid `~/.netrc` entry for `urs.earthdata.nasa.gov` remains required. Additionally, CDSE credentials must be configured as described in the *Additional setup* section above.
 
 ```
 isce2_topsapp --reference-scenes S1A_IW_SLC__1SDV_20220212T222803_20220212T222830_041886_04FCA3_2B3E \
                                  S1A_IW_SLC__1SDV_20220212T222828_20220212T222855_041886_04FCA3_A3E2  \
               --secondary-scenes S1A_IW_SLC__1SDV_20220131T222803_20220131T222830_041711_04F690_8F5F \
                                  S1A_IW_SLC__1SDV_20220131T222828_20220131T222855_041711_04F690_28D7  \
               --frame-id 25502 \
-              --download-source cdse
+              --download-source CDSE
 ```
 
 ## What makes an ARIA-S1-GUNW Product *standard*?

isce2_topsapp/__main__.py

@@ -44,7 +44,7 @@ def localize_data(
     dry_run: bool = False,
     water_mask_flag: bool = True,
     geocode_resolution: int = 90,
-    download_source: str = "asf",
+    download_source: str = "ASF",
 ) -> dict:
     """The dry-run prevents gets necessary metadata from SLCs and orbits.
 
@@ -209,12 +209,12 @@ def get_slc_parser():
     parser.add_argument(
         "--download-source",
         type=str,
-        choices=["asf", "cdse"],
-        default="asf",
+        choices=["ASF", "CDSE"],
+        default="ASF",
         help=(
             "Source for downloading Sentinel-1 SLC granules. "
-            "'asf' uses Alaska Satellite Facility (requires Earthdata credentials). "
-            "'cdse' uses Copernicus Data Space Ecosystem (requires CDSE credentials "
+            "'ASF' uses Alaska Satellite Facility (requires Earthdata credentials). "
+            "'CDSE' uses Copernicus Data Space Ecosystem (requires CDSE credentials "
             "via CDSE_USERNAME/CDSE_PASSWORD env vars or ~/.netrc)."
         ),
     )
@@ -260,7 +260,7 @@ def gunw_slc():
     # Validation 
     ensure_earthdata_credentials(args.username, args.password)
     # Also validate CDSE credentials if using CDSE for download
-    if args.download_source == "cdse":
+    if args.download_source == "CDSE":
         from isce2_topsapp.localize_slc_cdse import ensure_cdse_credentials
 
         ensure_cdse_credentials()
@@ -490,7 +490,7 @@ def coseis_sar():
     # Validation - always need Earthdata creds for ASF metadata lookup
     ensure_earthdata_credentials(args.username, args.password)
     # Also validate CDSE credentials if using CDSE for download
-    if args.download_source == "cdse":
+    if args.download_source == "CDSE":
         from isce2_topsapp.localize_slc_cdse import ensure_cdse_credentials
 
         ensure_cdse_credentials()

isce2_topsapp/localize_slc.py

@@ -170,7 +170,7 @@ def download_slcs(
     min_frame_coverage: float = MIN_FRAME_COVERAGE_DEFAULT,
     max_workers_for_download: int = 5,
     dry_run: bool = False,
-    download_source: str = "asf",
+    download_source: str = "ASF",
 ) -> dict:
     reference_obs = get_asf_slc_objects(reference_ids)
     secondary_obs = get_asf_slc_objects(secondary_ids)
@@ -234,7 +234,7 @@ def download_slcs(
     if frame_id != -1:
         processing_geo = _get_frame_by_id(frame_id).geometry
 
-    if download_source == "cdse":
+    if download_source == "CDSE":
         from isce2_topsapp.localize_slc_cdse import download_slcs_from_cdse
 
         all_ids = reference_ids + secondary_ids