From 1610ba90e8079d5d58fa82aa46696ea3b43b690a Mon Sep 17 00:00:00 2001
From: Scott Staniewicz <scott.j.staniewicz@jpl.nasa.gov>
Date: Mon, 15 Jul 2024 22:41:19 -0400
Subject: [PATCH] use `NBITS=16` when saving LOS files (#51)

---
 src/opera_utils/constants.py | 2 +-
 src/opera_utils/download.py  | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/opera_utils/constants.py b/src/opera_utils/constants.py
index 8ebfc15..dae186a 100644
--- a/src/opera_utils/constants.py
+++ b/src/opera_utils/constants.py
@@ -34,6 +34,6 @@
     *DEFAULT_TIFF_OPTIONS,
     # Note: we're dropping mantissa bits before we do not
     # need prevision for LOS rasters (or incidence)
-    "DISCARD_LSB=6",
+    "NBITS=16",
     "PREDICTOR=2",
 )
diff --git a/src/opera_utils/download.py b/src/opera_utils/download.py
index 419aa2a..0aec6ab 100644
--- a/src/opera_utils/download.py
+++ b/src/opera_utils/download.py
@@ -228,7 +228,11 @@ def _download_for_burst_ids(
     if product == L2Product.CSLC:
         logger.debug(f"Found {len(results)} total results before deduping pgeVersion")
         results = filter_results_by_date_and_version(results)
-    logger.info(f"Found {len(results)} results")
+
+    msg = f"Found {len(results)} results"
+    if len(results) == 0:
+        raise ValueError(msg)
+    logger.info(msg)
     session = _get_auth_session()
     urls = _get_urls(results)
     asf.download_urls(