Search found 6 matches

by timothy.w.hilton
Mon Jan 22, 2024 10:23 pm America/New_York
Forum: Home
Question: MODIS band 6, or LSWI, at 250m resolution?
Replies: 3

Re: MODIS band 6, or LSWI, at 250m resolution?

ok, thanks for looking into it, Brett!
by timothy.w.hilton
Wed Dec 20, 2023 8:38 pm America/New_York
Forum: Home
Question: LPdaac opendap server 400 errors for MOD13Q1.061 data
Replies: 3

Re: LPdaac opendap server 400 errors for MOD13Q1.061 data

LP DAAC - afriesz wrote: > @timothy.w.hilton, > > When I paste the URL you provided directly into the browser, I get a 400 error as > well. This is because the characters in the parameters you are passing (everything > after the ?) need to be encoded. Try this URL > > https://opendap.cr.usgs.gov/ope...
by timothy.w.hilton
Tue Dec 19, 2023 4:16 pm America/New_York
Forum: Home
Question: OPenDAP netCDF retrieval increases filesize considerably
Replies: 1

Re: OPenDAP netCDF retrieval increases filesize considerably

OK, on further consideration this makes more sense to me. I did not notice that the HDF file does not include the longitude/latitude coordinate values. The netCDF file includes lon and lat as 4800x4800 64-bit floating point netCDF variables, which comes out to 175 MB each just for lon and lat. If I ...
by timothy.w.hilton
Thu Dec 14, 2023 9:58 pm America/New_York
Forum: Home
Question: MODIS band 6, or LSWI, at 250m resolution?
Replies: 3

MODIS band 6, or LSWI, at 250m resolution?

Hello, I'm seeking to calculate land surface water index (LSWI) to use alongside the M*D13Q1.061 250m EVI values. LSWI is calculated as (NIR - SWIR) / (NIR + SWIR); in terms of MODIS bands: (band 2 - band 6) / (band 2 + band 6). I can get 250m band 1, 2, 3, and 7 values from M*D13Q1.061, but I'm onl...
by timothy.w.hilton
Wed Dec 13, 2023 6:37 pm America/New_York
Forum: Home
Question: OPenDAP netCDF retrieval increases filesize considerably
Replies: 1

OPenDAP netCDF retrieval increases filesize considerably

Hello, I'm using OPenDAP to retrieve netCDF files for a subset of layers in MOD13Q1.061. I'm noticing that my netCDF files containing 3 layers are larger than the original HDF files containing 11 layers. I suspect this is because hyrax is converting HDF short types to netCDF float types. Is this exp...
by timothy.w.hilton
Sun Dec 10, 2023 10:26 pm America/New_York
Forum: Home
Question: LPdaac opendap server 400 errors for MOD13Q1.061 data
Replies: 3

LPdaac opendap server 400 errors for MOD13Q1.061 data

I'm trying to download MOD13Q1.061 data for several tiles from the LPDAAC opendap server. I'm getting a lot of 400 errors trying to adapt the opendap quick start guide (https://opendap.github.io/documentation/QuickStart.html) to my situation. I can access the html forms at the data URLs (for example...