[R-sig-Geo] Satellite Image analysis-TRMM Data

[Roger Bivand]

On Sun, 28 Aug 2022, Daniel Kelley wrote:

> I've not tried downloading any data, since 
> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdisc2.gesdisc.eosdis.nasa.gov%2Fdata%2FTRMM_L3%2FTRMM_3B43%2F2019%2F&data=05%7C01%7CRoger.Bivand%40nhh.no%7C866347cd5f494fb9a75f08da88e435e4%7C33a15b2f849941998d56f20b5aa91af2%7C0%7C0%7C637972811138889948%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=W3OALAwTPSZCO%2FNFpof20Z4gMZHanXQmyrCilrSFXWo%3D&reserved=0 
> requires a username and a password, but a websearch got me to 
> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdisc2.gesdisc.eosdis.nasa.gov%2Fdata%2FTRMM_L3%2FTRMM_3B43%2Fdoc%2FREADME.TRMM_V7.pdf&data=05%7C01%7CRoger.Bivand%40nhh.no%7C866347cd5f494fb9a75f08da88e435e4%7C33a15b2f849941998d56f20b5aa91af2%7C0%7C0%7C637972811138889948%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=6UPwX9x4Bju%2BqEizVUFjHCcVWYkP2dhA0du5bTLU6j0%3D&reserved=0, 
> Table 3 of which indicaes that the format is HDF4. From 
> https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F36772341%2Freading-hdf-files-into-r-and-converting-them-to-geotiff-rasters&data=05%7C01%7CRoger.Bivand%40nhh.no%7C866347cd5f494fb9a75f08da88e435e4%7C33a15b2f849941998d56f20b5aa91af2%7C0%7C0%7C637972811138889948%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=ppuoQ9O5CcRnQ7xRqydhURwhJQuQHSS2KKHEgDCNTKY%3D&reserved=0 
> it seems that R can read HDF5 but not HDF4, so you may be out of luck 
> for direct reading by R, and might need to install some other 
> commandline tools to first transform the data into another format.

Dan, thanks for looking to try to determine the format!

Please check whether the GDAL HDF4 driver is present in the version of 
the packages with for example:

x <- terra::gdal(drivers=TRUE)
x[grep("HDF", x$name),]

on your platform. I think that you will see:

         name   type        can   vsi                          long.name
54      HDF4 raster       read FALSE Hierarchical Data Format Release 4
55 HDF4Image raster read/write FALSE                       HDF4 Dataset
56      HDF5 raster       read  TRUE Hierarchical Data Format Release 5
57 HDF5Image raster       read  TRUE                       HDF5 Dataset

The row numbers may vary depending on the driver count on your platform.

Hope this helps,

Roger

>
> On Aug 28, 2022, at 7:00 AM, r-sig-geo-request using r-project.org wrote:
>
> Message: 1
> Date: Sun, 28 Aug 2022 19:59:06 +1200
> From: sownal chand <sownalchandfms using gmail.com<mailto:sownalchandfms using gmail.com>>
> To: r-sig-geo using r-project.org<mailto:r-sig-geo using r-project.org>
> Subject: [R-sig-Geo] Satellite Image analysis-TRMM Data
> Message-ID:
>       <CAH5tCz1cdoNtFMLNV5wf5SPvR-DvSv6HwV4jQ3Ln5J4WGa05Hw using mail.gmail.com<mailto:CAH5tCz1cdoNtFMLNV5wf5SPvR-DvSv6HwV4jQ3Ln5J4WGa05Hw using mail.gmail.com>>
> Content-Type: text/plain; charset="utf-8"
>
> Hello Sir/Madam,
>
> I was looking for some information on satellite data analysis using R. If
> someone can provide me with a link or some materials for reading it
> would be great.
>
> Thanking you in advance
> sownalc
>
>
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-- 
Roger Bivand
Emeritus Professor
Department of Economics, Norwegian School of Economics,
Postboks 3490 Ytre Sandviken, 5045 Bergen, Norway.
e-mail: Roger.Bivand using nhh.no
https://orcid.org/0000-0003-2392-6140
https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en