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 Post subject: Problems with projected GeoTIFF files
PostPosted: 30 Oct 2018, 12:18 
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Joined: 08 Oct 2018, 09:17
Posts: 7
Hi, we're having a problem with GeoTIFF files which have the Model Type tag set to Projected (1).

The problem is that in the Field Selector tab of the Data Explorer in McIDAS-V (1.7u1), the only Display option shown is Omni Control - the normal Image Display options aren't shown.

GeoTIFF files with Model Type set to Geographic (2) all work fine and can be opened in an Image Display.

This is causing us a particular problem with certain GeoTIFF files produced by the NASA DRL IPOPP software which use a Stereographic projection by default.

We altered some settings in IPOPP to generate those files using the Geographic model type and this allowed them to be opened in an Image Display.

However we need to be able to use the Stereographic projection for polar regions, where Geographic isn't suitable.

I found previous posts about problems with non-rectilinear coordinate systems when using the Flat File data source, but please can someone confirm if there are similar limitations for GeoTIFF files. And if so, are there any plans to support projected GeoTIFF files in the future?

Best Regards,

Chris Wright
Dartcom


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 Post subject: Re: Problems with projected GeoTIFF files
PostPosted: 30 Oct 2018, 19:51 
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Joined: 08 Jan 2009, 17:42
Posts: 211
Hi Chris,

Thanks for reporting and explaining this issue. There is an existing request to expand the projection types supported with GeoTIFF files. It's written up as McIDAS-V Inquiry 1835. I will add a cross-reference in it to this forum post so the programmer is aware of your particular request.

Can you please post a sample file (or files) to our anonymous ftp? Here are instructions:

ftp ftp.ssec.wisc.edu
user: anonymous
password: your_email_address
bin
cd pub/incoming
put filename
bye

Once you post the file(s), please let us know the name(s) so we can add it/them to our testing dataset.

Thank you,
Barry


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 Post subject: Re: Problems with projected GeoTIFF files
PostPosted: 31 Oct 2018, 02:30 
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Joined: 11 Nov 2010, 17:40
Posts: 168
Hi Sir

I know this..
The best way to handle this is to get
the ncj geotiff iosp:
https://github.com/USGS-CIDA/geotiff-iosp

I posted it long time back to ncj community.
They told it may get integrated into the ncj branch in due course of time. But it never happened.
If you can post that sample file. I can try to atleast ingest it into mcv.

Regards
Ghansham


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 Post subject: Re: Problems with projected GeoTIFF files
PostPosted: 31 Oct 2018, 02:39 
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Joined: 11 Nov 2010, 17:40
Posts: 168
See this thread:

https://www.unidata.ucar.edu/support/he ... 02340.html


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 Post subject: Re: Problems with projected GeoTIFF files
PostPosted: 31 Oct 2018, 04:51 
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Joined: 11 Nov 2010, 17:40
Posts: 168
Hi all

Sample program showing how to read projected geotiff using geotiff iosp for ncj.
Output of program is also shown.

The best way could be to create an "Under Development->DataSource" before ncj community officially adopts it :-)

Ghansham


Attachments:
Output.txt [2.61 KiB]
Downloaded 149 times
TestGTIosp.java.txt [1.1 KiB]
Downloaded 159 times
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 Post subject: Re: Problems with projected GeoTIFF files
PostPosted: 31 Oct 2018, 10:19 
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Joined: 08 Oct 2018, 09:17
Posts: 7
Thanks for your replies Barry and Ghansham.

A sample GeoTIFF file containing channel 4 of an AHRPT image transformed to a Stereographic projection can be downloaded from here:

ftp://ftp.dartcom.co.uk/pub/geotiff/DartcomGeoTIFF.tif

And this is what it looks like when loaded into Global Mapper:
Attachment:
File comment: DartcomGeoTIFF.tif loaded into Global Mapper
DartcomGeoTIFFPreview.png
DartcomGeoTIFFPreview.png [ 302.57 KiB | Viewed 146 times ]

I've also uploaded the following files to the pub/incoming folder on ftp.ssec.wisc.edu:

DartcomGeoTIFF.tif
MODSHARPTCOLOR_roi1_18302105308.tif

The second file is a BlueMarble MODIS image generated by the NASA DRL IPOPP software using the Stereographic projection.

Regarding the NCJ GeoTIFF IOSP, I'm not clear how I could add this to McIDAS-V - any pointers Ghansham?

Best Regards,
Chris


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 Post subject: Re: Problems with projected GeoTIFF files
PostPosted: 31 Oct 2018, 13:45 
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Joined: 11 Nov 2010, 17:40
Posts: 168
The quickfix can be I can create a plugin and send you that. It should work for you.


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 Post subject: Re: Problems with projected GeoTIFF files
PostPosted: 31 Oct 2018, 17:24 
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Joined: 08 Oct 2018, 09:17
Posts: 7
Many thanks Ghansham, if you can give me a link to download the plugin I'll give it a try.

Chris


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 Post subject: Re: Problems with projected GeoTIFF files
PostPosted: 31 Oct 2018, 17:40 
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Joined: 11 Nov 2010, 17:40
Posts: 168
Hi All

I will try to generate a plugin and upload it on this thread itself. Give me a couple of days.
Ghansham


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 Post subject: Re: Problems with projected GeoTIFF files
PostPosted: 02 Nov 2018, 08:45 
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Joined: 08 Oct 2018, 09:17
Posts: 7
Thanks Ghansham, there's no hurry. Will await news in due course.

Chris


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