Search found 20 matches

by hanzhi.lin
Wed Jan 11, 2023 8:18 am America/New_York
Forum: Questions/Comments
Question: Difference at 4 decimals of geolocation files
Replies: 3

Re: Difference at 4 decimals of geolocation files

Hi LAADS folks, Thank you for replying my post. Sorry for the confusion. I mean other MODIS products in OB like L1A whose locations rely on these geolocation files. For example, if I use geofiles from OB to select region of my interest in L1A from OB, can I get the same ranges of scan numbers and fr...
by hanzhi.lin
Fri Dec 30, 2022 6:46 pm America/New_York
Forum: Questions/Comments
Question: Difference at 4 decimals of geolocation files
Replies: 3

Difference at 4 decimals of geolocation files

Hi , I found the geolocation files from OB and from LAADs that have the same timestamp, usually have slight difference since their 4 decimals. It seems this difference is within the allowed accuracy of 0.1 pixel, after I read the ATBD of geo-location. But I'm not sure I understand it correctly, and ...
by hanzhi.lin
Sat Dec 17, 2022 11:24 pm America/New_York
Forum: Questions/Comments
Question: Some missing Aqua MODIS GEOfiles between 2009110-2009122
Replies: 1

Some missing Aqua MODIS GEOfiles between 2009110-2009122

Hi folks at OB.DAAC,

I find between the day 2009110 to 2009122, every day there are several aqua MODIS geofiles missing, most of which ought to be night time granules. Could you check it if possible?

Cheers,

Hanzhi
by hanzhi.lin
Sat Dec 17, 2022 7:10 pm America/New_York
Forum: Questions/Comments
Question: Missing aqua MODIS geofiles
Replies: 1

Missing aqua MODIS geofiles

Hi,

The Aqua MODIS geofiles between timestamp 2009110.2255 and 2009110.2330 are missing.

Hanzhi
by hanzhi.lin
Fri Dec 16, 2022 10:49 am America/New_York
Forum: Questions/Comments
Question: Terra MODIS Processing on Hold as of December 1, 2022
Replies: 1

Re: Terra MODIS Processing on Hold as of December 1, 2022

Does this hold mean the current NRT version of L1A and geofiles on LANCE also not reliable for geolocation?
by hanzhi.lin
Thu Nov 10, 2022 11:57 am America/New_York
Forum: Questions/Comments
Question: Missing a few granules of Aqua GEO on 2014001
Replies: 1

Missing a few granules of Aqua GEO on 2014001

Hi OBDAAC folks, For the day 2014001, the aqua geo-location file list on OBDAAC shows 286 files, while on LAADs for the same day, there are 288 geo-location files. Then it seems there might be two granules missing on OB.DAAC? I just randomly picked up a day for completeness check on aqua geolocation...
by hanzhi.lin
Wed Nov 02, 2022 4:11 pm America/New_York
Forum: Questions/Comments
Question: download MYD03 from LAADS' OPENDAP with wget
Replies: 1

download MYD03 from LAADS' OPENDAP with wget

Hi, I tried to follow the wget syntax provided on LAADS to bulk download one day MYD03 hdf files from LAADS opendap, but it failed by downloading many .dap, .dds etc. files other than the hdf format of these granules. I was wondering if there is a wget template or example for bulk downloading hdf fi...
by hanzhi.lin
Tue Nov 01, 2022 10:44 pm America/New_York
Forum: Questions/Comments
Question: Have all Aqua nighttime GEO files been published on OB.DAAC?
Replies: 1

Have all Aqua nighttime GEO files been published on OB.DAAC?

Hi, First I appreciate your time and hard work on R2022 reprocessing for both Aqua and Terra, esp for adding Aqua nighttime geo files and all Terra geo files. Today I just found there are two day available geo files for Terra in 2022, and available nighttime geo files for Aqua for many days. I was w...
by hanzhi.lin
Mon Oct 31, 2022 12:31 pm America/New_York
Forum: Questions/Comments
Question: MODIS Terra geolocation files
Replies: 4

Re: MODIS Terra geolocation files

Thanks, Alicia. May I know a draft date when these GEO files of both Aqua and Terra be published online?
by hanzhi.lin
Fri Oct 28, 2022 5:06 pm America/New_York
Forum: Questions/Comments
Question: Find swaths in L1/L2 browser
Replies: 1

Find swaths in L1/L2 browser

My plan is to find all L1A of MODIS Aqua that contain any part of my area of interest, i.e. a L1A could be counted even its one frame is in my area of interest. In L1/L2 browser, I suppose the "select swath containing (at least)... " option could help me accomplish this goal. However, I'm ...