save_datasets does not save dependencies available due to unload=False

[gerritholl]

Describe the bug

When I load a composite with unload=False, then run sc.save_datasets, the datasets loaded as dependencies are not saved.

To Reproduce

import tempfile
from satpy.scene import Scene
from glob import glob

fn_sev = glob("/media/nas/x21308/scratch/SEVIRI/H-000*201904151000*")
sc = Scene(filenames={"seviri_l1b_hrit": fn_sev})

sc.load(["overview"], unload=False)

print("Number of unique dataset names:", len({d.name for d in sc.keys()}))
with tempfile.TemporaryDirectory() as td:
    sc.save_datasets(filename=td + "/test_{name:s}.tif")
    print("Number of files found:", len(glob(td + "/*.tif")))

Expected behavior

I expect:

Number of unique dataset names: 4
Number of files found: 4

Actual results

It's actually only writing out one file, so Number of files found: 1.

``` [DEBUG: 2020-04-07 19:06:32 : satpy.scene] Setting 'PPP_CONFIG_DIR' to '/home/gholl/checkouts/satpy/satpy/etc/' [181/1431] [DEBUG: 2020-04-07 19:06:32 : satpy.readers] Reading ['/data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/satpy/etc/readers/seviri_l1b_hrit.yaml', '/home/gholl/checkouts/satpy/satpy/etc/readers/seviri_l1b_hrit.yaml'] [DEBUG: 2020-04-07 19:06:32 : satpy.readers.yaml_reader] Assigning to seviri_l1b_hrit: ['/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000007___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000012___-201904151000-__' , '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000023___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000018___-2019 04151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000016___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000001___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-00 0010___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000017___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________- HRV______-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000014___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000013___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-M SG4________-HRV______-000021___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000019___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000020___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H- 000-MSG4__-MSG4________-HRV______-000022___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000024___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000015___-201904151000-__', '/media/nas/x21308/scrat ch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000009___-201904151000-__', '/media/nas/ x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000011___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-HRV______-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_016___-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_016___-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_016___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_016___-000002___-201904 151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_016___-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_016___-000007___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_016___-0000 01___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_016___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_039___-000001___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR _039___-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_039___-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_039___-000007___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG 4________-IR_039___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_039___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_039___-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-00 0-MSG4__-MSG4________-IR_039___-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_087___-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_087___-000006___-201904151000-__', '/media/nas/x21308/scratch /SEVIRI/H-000-MSG4__-MSG4________-IR_087___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_087___-000001___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_087___-000003___-201904151000-__', '/media/nas/x2 1308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_087___-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_087___-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_087___-000007___-201904151000-__', '/ media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_097___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_097___-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_097___-000007___-20190415 1000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_097___-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_097___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_097___-000003 ___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_097___-000001___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_097___-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_1 08___-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_108___-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_108___-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4_ _______-IR_108___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_108___-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_108___-000007___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000- MSG4__-MSG4________-IR_108___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_108___-000001___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_120___-000005___-201904151000-__', '/media/nas/x21308/scratch/S EVIRI/H-000-MSG4__-MSG4________-IR_120___-000001___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_120___-000007___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_120___-000008___-201904151000-__', '/media/nas/x213 08/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_120___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_120___-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_120___-000002___-201904151000-__', '/me dia/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_120___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_134___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_134___-000001___-2019041510 00-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_134___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_134___-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_134___-000005__ _-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_134___-000007___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_134___-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-IR_134 ___-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS006___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS006___-000007___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4___ _____-VIS006___-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS006___-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS006___-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MS G4__-MSG4________-VIS006___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS006___-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS006___-000001___-201904151000-__', '/media/nas/x21308/scratch/SEV IRI/H-000-MSG4__-MSG4________-VIS008___-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS008___-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS008___-000007___-201904151000-__', '/media/nas/x21308 /scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS008___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS008___-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS008___-000001___-201904151000-__', '/medi a/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS008___-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-VIS008___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_062___-000004___-201904151000 -__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_062___-000007___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_062___-000001___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_062___-000008___- 201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_062___-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_062___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_062__ _-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_062___-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_073___-000004___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4_____ ___-WV_073___-000007___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_073___-000001___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_073___-000008___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4 __-MSG4________-WV_073___-000002___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_073___-000005___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-WV_073___-000003___-201904151000-__', '/media/nas/x21308/scratch/SEVIR I/H-000-MSG4__-MSG4________-WV_073___-000006___-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-_________-PRO______-201904151000-__', '/media/nas/x21308/scratch/SEVIRI/H-000-MSG4__-MSG4________-_________-EPI______-201904151000-__'] [INFO: 2020-04-07 19:06:32 : hrit_msg] No IMPF configuration field found in prologue. [DEBUG: 2020-04-07 19:06:32 : hrit_msg] Computing actual satellite position [DEBUG: 2020-04-07 19:06:33 : satpy.composites] Looking for composites config file seviri.yaml [DEBUG: 2020-04-07 19:06:33 : satpy.composites] Looking for composites config file visir.yaml /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.005994 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.006007 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.005722 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.005801 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.005931 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.005968 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.006117 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.005575 /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordin ate-reference-systems proj_string = self.to_proj4() [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.009222 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.009216 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.008912 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.009284 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.008759 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.009125 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.008656 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.009161 /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.006479 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.005621 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.005457 [DEBUG: 2020-04-07 19:06:33 : hrit_msg] Calibration time 0:00:00.006019 [DEBUG: 2020-04-07 19:06:34 : hrit_msg] Calibration time 0:00:00.005976 [DEBUG: 2020-04-07 19:06:34 : hrit_msg] Calibration time 0:00:00.005500 [DEBUG: 2020-04-07 19:06:34 : hrit_msg] Calibration time 0:00:00.005501 [DEBUG: 2020-04-07 19:06:34 : hrit_msg] Calibration time 0:00:00.005440 /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() [DEBUG: 2020-04-07 19:06:34 : satpy.composites] Applying sun zen correction [DEBUG: 2020-04-07 19:06:34 : satpy.composites] Computing sun zenith angles. [DEBUG: 2020-04-07 19:06:34 : satpy.composites] Apply the standard sun-zenith correction [1/cos(sunz)] [DEBUG: 2020-04-07 19:06:34 : satpy.composites] Sun-zenith correction applied. Computation time: 0.0 (sec) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() [DEBUG: 2020-04-07 19:06:34 : satpy.composites] Applying sun zen correction [DEBUG: 2020-04-07 19:06:34 : satpy.composites] Computing sun zenith angles. [DEBUG: 2020-04-07 19:06:34 : satpy.composites] Apply the standard sun-zenith correction [1/cos(sunz)] [DEBUG: 2020-04-07 19:06:34 : satpy.composites] Sun-zenith correction applied. Computation time: 0.0 (sec) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/pyproj/crs/crs.py:543: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordi$ ate-reference-systems proj_string = self.to_proj4() [DEBUG: 2020-04-07 19:06:34 : satpy.writers] Reading ['/data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/satpy/etc/writers/geotiff.yaml', '/home/gholl/checkouts/satpy/satpy/etc/writers/geotiff.yaml'] [DEBUG: 2020-04-07 19:06:34 : satpy.writers] Enhancement configuration options: [{'name': 'inverse', 'method': , 'args': [[False, False, True]]}, {'name': 'stretch', 'method': , 'kwargs': {'stretch': 'linear'}}$ {'name': 'gamma', 'method': , 'kwargs': {'gamma': 1.6}}] [DEBUG: 2020-04-07 19:06:34 : trollimage.xrimage] Applying invert with parameters [False, False, True] [DEBUG: 2020-04-07 19:06:34 : trollimage.xrimage] Applying stretch linear with parameters {} [DEBUG: 2020-04-07 19:06:34 : trollimage.xrimage] Perform a linear contrast stretch. [DEBUG: 2020-04-07 19:06:34 : trollimage.xrimage] Calculate the histogram quantiles: [DEBUG: 2020-04-07 19:06:34 : trollimage.xrimage] Left and right quantiles: 0.005 0.005 [DEBUG: 2020-04-07 19:06:34 : trollimage.xrimage] Applying gamma 1.6 [DEBUG: 2020-04-07 19:06:34 : rasterio.env] Entering env context: [DEBUG: 2020-04-07 19:06:34 : rasterio.env] Starting outermost env [DEBUG: 2020-04-07 19:06:34 : rasterio.env] No GDAL environment exists [DEBUG: 2020-04-07 19:06:34 : rasterio.env] New GDAL environment created [DEBUG: 2020-04-07 19:06:34 : rasterio._env] GDAL_DATA found in environment: '/data/gholl/miniconda3/envs/py38/share/gdal'. [DEBUG: 2020-04-07 19:06:34 : rasterio._env] PROJ_LIB found in environment: '/data/gholl/miniconda3/envs/py38/share/proj'. [DEBUG: 2020-04-07 19:06:34 : rasterio._env] Started GDALEnv . [DEBUG: 2020-04-07 19:06:34 : rasterio.env] Entered env context: [DEBUG: 2020-04-07 19:06:34 : rasterio._io] Path: UnparsedPath(path='/tmp/tmpafr59wzi/test_overview.tif'), mode: w, driver: GTiff [DEBUG: 2020-04-07 19:06:34 : rasterio._io] Option: ('COMPRESS', b'DEFLATE') [DEBUG: 2020-04-07 19:06:34 : rasterio._io] Option: ('ZLEVEL', b'6') [DEBUG: 2020-04-07 19:06:34 : rasterio._io] Option: ('PHOTOMETRIC', b'RGB') [DEBUG: 2020-04-07 19:06:34 : rasterio._io] Skipped delete for overwrite. Dataset does not exist: /tmp/tmpafr59wzi/test_overview.tif [DEBUG: 2020-04-07 19:06:34 : rasterio._base] Nodata success: 0, Nodata value: -10000000000.000000 [DEBUG: 2020-04-07 19:06:34 : rasterio._base] Nodata success: 0, Nodata value: -10000000000.000000 [DEBUG: 2020-04-07 19:06:34 : rasterio._base] Nodata success: 0, Nodata value: -10000000000.000000 [DEBUG: 2020-04-07 19:06:34 : rasterio._base] Nodata success: 0, Nodata value: -10000000000.000000 [DEBUG: 2020-04-07 19:06:34 : rasterio.env] Exiting env context: [DEBUG: 2020-04-07 19:06:34 : rasterio.env] Cleared existing options [DEBUG: 2020-04-07 19:06:34 : rasterio._env] Stopped GDALEnv . [DEBUG: 2020-04-07 19:06:34 : rasterio.env] Exiting outermost env [DEBUG: 2020-04-07 19:06:34 : rasterio.env] Exited env context: [INFO: 2020-04-07 19:06:34 : satpy.writers] Computing and writing results... /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in cos return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in sin return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater_equal return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in log return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in cos return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in sin return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater_equal return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater_equal return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in cos return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in log return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in sin return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in log return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in log return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in cos return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in sin return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater_equal return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in greater return func(*(_execute_task(a, cache) for a in args)) /data/gholl/miniconda3/envs/py38/lib/python3.8/site-packages/dask/core.py:121: RuntimeWarning: invalid value encountered in log return func(*(_execute_task(a, cache) for a in args)) [DEBUG: 2020-04-07 19:06:36 : trollimage.xrimage] Interval: left= array([ 0. , 0. , -322.64242554]) Coordinates: quantile float64 0.005 Dimensions without coordinates: bands, right= array([ 102.68503157, 119.72653831, -213.19895935]) Coordinates: quantile float64 0.995 Dimensions without coordinates: bands [DEBUG: 2020-04-07 19:06:38 : rasterio._io] Dataset has been stopped. Number of unique dataset names: 4 Number of files found: 1 ```

Environment Info:

• OS: openSUSE 15
• Satpy Version: 0.21.0
• PyResample Version: 1.15.0+2.g3d6d38d

Additional context
There are also a lot of warnings, but I don't think they are related to this problem.

[djhoese]

Just for reference, here are the DatasetIDs in the Scene:

In [4]: scn.keys()
Out[4]:
[DatasetID(name='IR_108', wavelength=(9.8, 10.8, 11.8), resolution=3000.403165817, polarization=None, calibration='brightness_temperature', level=None, modifiers=()),
 DatasetID(name='VIS006', wavelength=(0.56, 0.635, 0.71), resolution=3000.403165817, polarization=None, calibration='reflectance', level=None, modifiers=()),
 DatasetID(name='VIS006', wavelength=(0.56, 0.635, 0.71), resolution=3000.403165817, polarization=None, calibration='reflectance', level=None, modifiers=('sunz_corrected',)),
 DatasetID(name='VIS008', wavelength=(0.74, 0.81, 0.88), resolution=3000.403165817, polarization=None, calibration='reflectance', level=None, modifiers=()),
 DatasetID(name='VIS008', wavelength=(0.74, 0.81, 0.88), resolution=3000.403165817, polarization=None, calibration='reflectance', level=None, modifiers=('sunz_corrected',)),
 DatasetID(name='overview', wavelength=None, resolution=3000.403165817, polarization=None, calibration=None, level=None, modifiers=None)]

[djhoese]

Oh! I think this is the code that matters:

satpy/satpy/scene.py

Lines 1344 to 1345 in 446af3a

	datasets = [self.datasets.get(ds) for ds in self.wishlist]
	datasets = [ds for ds in datasets if ds is not None]

The Scene is only going to save the datasets you explicitly requested (the ones on your wishlist). Since in your case everything except overview was a dependency of something you did ask for, it doesn't get saved.

[djhoese]

Additionally, if you'd like to save these, you can specify them in the datasets keyword argument to save_datasets.

[mraspaud]

This is a feature not a bug. Only requested datasets will be saved.

[djhoese]

Sorry, one more: This is intended. Most users consider it undesired to have the Scene save things they didn't ask for.

Edit: Of course, Martin gets to it first.

[gerritholl]

@mraspaud The documentation says otherwise:

Save all the datasets present in a scene to disk using writer.

Also, if a user didn't ask to keep the dependencies, why would they pass unload=False? The reason I'm passing unload=False is because I want to store all the dependencies (for debugging purposes). Doesn't explicitly passing unload=False means the user did ask for them?

[mraspaud]

Fair enough. I see a point in your use case, so PR is welcome :)