From f3bdd86d733055ad8628f1b71faa7692bbdb0f79 Mon Sep 17 00:00:00 2001
From: Bruce Flynn <brucef@ssec.wisc.edu>
Date: Wed, 5 May 2021 11:21:20 -0500
Subject: [PATCH] add module for EOS utils
---
edosl0util/eos.py | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
create mode 100644 edosl0util/eos.py
diff --git a/edosl0util/eos.py b/edosl0util/eos.py
new file mode 100644
index 0000000..c420a94
--- /dev/null
+++ b/edosl0util/eos.py
@@ -0,0 +1,41 @@
+""" NASA EOS mission specific data
+
+References:
+ 1. MODIS Command, Telemetry, Science and Engineering Description,
+ Document Number 151840, May 1997, Appendix C
+ https://directreadout.sci.gsfc.nasa.gov/documents/satellite_gen/MODIS_UG.pdf
+"""
+
+packet_types = {
+ 0: "day",
+ 1: "night",
+ 2: "eng1",
+ 4: "eng2",
+}
+
+packet_sources = {
+ 0: "solar-diff",
+ 1: "srca-cal",
+ 2: "bb-cal",
+ 3: "space-cal",
+}
+
+packets_per_scan = {
+ "day": 3032,
+ "night": 326,
+}
+
+def sourceid(p):
+ if p.data[0] >> 7 == 0:
+ return "earthdata"
+ return packet_source[p.data[0] >> 5 & 0x3]
+
+def mirrorside(p):
+ return ["side1", "side2"][bytes(p.secondary_header)[8] & 0x1]
+
+def scancount(p):
+ return bytes(p.secondary_header)[8] >> 1 & 0x7
+
+def pkttype(p):
+ return packet_types[bytes(p.secondary_header)[8] >> 4 & 0x7]
+
--
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