RE: orthorectified ICOL product

RE: Lost of reference information?

2010-03-11T15:02:58Z

Hi , I'm sorry for all the questions but I'm really hopping that you can help me.
As I said earlier the reprojection worked but now I can't work with these images on matlab because they are all twisted and with bad resolution I don´t know why.

If the exportation as geotiff worked and the images were perfectly overlapped that would be the best thing. Correcting what I said before the offset between images is no more than 5 kilometres (instead of 50km).

I will now wait for your reply and thank you in advance for all your help on this.

Best regards Helder

RE: Lost of reference information?

2010-03-11T12:30:36Z

Hi! Just wanted to say the the re projection worked very well now the images are perfectly overlayed !

I hope I can still work with them as they are on Matlab or else its is going to be another problem to solve...

However I still didn't understand why they didn't worked when I exported the product as geotiff just because its a Geotiff image format.

Anyway thank you very much e good work to everybody!

Best regards Helder

RE: Lost of reference information?

2010-03-11T10:54:35Z

Hello Marco, I don´t know how big is the displacement it is not the same for all the images... Some images work well but other don´t.

I'm processing the ocean colour of the cost of Portugal and some images have about 50 Km displacement on (dx,dy).

No I didn't reprojected the images, I did that to one image but it got a distortion. I'm going to try to reproject two bad images and then I'll give you some feed back.

I don't know how to add an image here but I would gladly send them to any image hosting site you wish just tell me which one.

Thanks !

Helder

RE: Lost of reference information?

2010-03-11T07:21:44Z

Hello Helder

How big is the displacement?
Have you reprojected those images before exporting?

Can you add an image, demonstrating the displacement, to you next post, please.

best wishes
Marco

Lost of reference information?

2010-03-10T12:40:18Z

Hello, I'm having difficulties exporting a L2 Meris subset as geotiff.

Some images while opening them on Arcgis or Matlab do not perfectly overlap each other. It appears that a translation on x and y axis occurred.

Could you help me with this question?

Thanks for the help in advance best wishes Helder

RE: CHRIS-Box 1.5 Geometric Correction - OperatorException

2010-03-10T02:40:44Z

Hey Marco!

I downloaded the telemetry repository and geometric correction worked. Now I'm learning to use GCPs to improve the geolocation and, with hope, I'll figure out how to geolocate, co-locate pixels; enough so that I can sample the BRDF where I have ground data.

If I can manage all that, I may never have to leave BEAM for my basic processing. That would make my work much easier.

Thanks so much, and best regards,

Kevin

Update of NASA OBPG Reader available

2010-03-09T08:29:25Z

We have updated the BEAM reader for the NASA OBPG data products, which now supports the changes introduced with the latest reprocessing. The update can be easily installed using the update manager of BEAM, available from the VISAT Help menu.

RE: CHRIS-Box 1.5 Geometric Correction - OperatorException

2010-03-09T07:45:08Z

I wasn't deeply involved in the recent development of CHRIS-Box.
But as far as I know you have to download the telemetry data manually. It is only needed for older CHRIS data product. I don't know what "older" means.
The link in the wiki should be the right one to get the data.

best wishes
Marco

CHRIS-Box 1.5 Geometric Correction - OperatorException

2010-03-09T06:47:18Z

So far, CHRIS-Box 1.5 seems to be working great on Mac OS X 10.6.2. I've tried noise reduction, cloud screening, and surface reflectance.

Geometric correction is new, and although I'm not exactly sure how it works, I thought that I would give it a try on my atmospherically corrected scene. However, I got the following error message:

An internal error occurred during the target product initialisation.
Type: OperatorException
Message: Cannot find telemetry file matching pattern '.*\.Blackwater-Marsh_(\d+)_CHRIS_center_times_20070901_.*'.

I don't know what telemetry file is looking for or what the pattern is supposed to match. Do this have to do with the telemetry repository mentioned in the help? Is this repository, or the telemetry file, something built into BEAM? Or, do I need to acquire it from somewhere else?

Best,
Kevin

RE: BEAM 4.7 w/ CHRIS Tools on Mac OS X 10.6.2

2010-03-09T04:34:46Z

What can I say? Yeaaaah! Brilliant! I'll downloading right away.

RE: BEAM 4.7 w/ CHRIS Tools on Mac OS X 10.6.2

2010-03-08T13:25:43Z

You can cheer out loud.

The CHRIS-Box v1.5 is now released for BEAM 4.7

best wishes
Marco

RE: GeoTiff Export and Read on Matlab r2006b

2010-03-08T08:25:25Z

Create a new product before creating the band.

Leave the pre-selected option 'Use Geocoding Only' selected. The result is an empty product with the same geo-location.
Now you can create within this product a new band by maths. Reference the band of the original product( $1.total_susp).

Now you can export the GeoTiff.

With VISAT it is not possible. But it is possible to write a script and to use GPT to automate this process.
The operator you should use for this is the BandMaths.

best wishes
Marco

RE: BEAM 4.7 w/ CHRIS Tools on Mac OS X 10.6.2

2010-03-05T16:54:10Z

I really look forward to CHRIS-Box 1.5. Thanks.

RE: GeoTiff Export and Read on Matlab r2006b

2010-03-05T13:15:30Z

Another thing, is it possible to export more than one product at a time or do I have to do the step export for each image created?

RE: GeoTiff Export and Read on Matlab r2006b

2010-03-05T13:03:15Z

Thanks for your post, it was very helpful. However I noticed that once I create a new band by maths I am unable to export this single band has Geotiff image.
I want to export a Geotiff image of the band Total Suspended Matter preferentially with the scaling factor and offset already compensated as you said earlier.
I can do this on Matlab and it works very well but it would be better if the image that I upload to Matlab is already compensated.

I don't know if I was clear on exposing the problem. Many tanks in advance to you and thank you for all the support you've been giving to this.

Helder Duarte dos Santos Almeida
Faculty of Sciences - University of Oporto
Portugal

RE: GeoTiff Export and Read on Matlab r2006b

2010-03-05T08:35:06Z

That the image appears as 8 bit might correct depending on the band.
We export only the raw data to GeoTiff. If multiple bands are stored in a single GeoTiff have to store all bands in the data type. So in most cases it is Float32. If only a single band is stored, the data type of this band is used (e.g. water_vapour is uint8).

To get the correct geophysical data, you have to apply the scaling factor and offset. You can do this in Matlab or in VISAT.
In VISAT you can use the Band Maths to create a copy band. The resulting band will be Float32. Scaling factor and offset are automatically applied.
For computing the geophysical data in Matlab you can retrieve the scaling factor and offset in the information dialog.

best wishes
Marco

RE: Reading ALOS AVNIR-2 1B1 images

2010-03-05T08:10:13Z

Hi

I do not know AVNIR-2 data level 1.1, do you mean 1B1?
BEAM only supports Level 1A, 1B1 and 1B2.
Also the format description is not update since 2006 and does not mention level 1.1 for AVNIR-2, only for
Palsar, which we do not support.

Anyway, the error message indicates that you are missing a file.
The volume descriptor file starts with VOL-.

GeoTiff Export and Read on Matlab r2006b

2010-03-04T15:42:37Z

Hi , When I export a Meris FR 2 image on GeoTiff format the images obviously is very large in size so I export only a subset of a particular area.

The problem is that each band has 32 bit pixel and FR 2 has 32 bands so I get a 1024 bit depth image and Matlab only supports 32 bits depth max.

I solved this problem by exporting only one band at a time for example in my case the band of total suspended matter and hopped to obtain a 32 bit Geotiff image.

The thing is when I open this image on Matlab using the function "imread" the image appears as an 8 bit image...

Can anyone tell me how to obtain the 32 bit image?

RE: Reading ALOS AVNIR-2 1B1 images

2010-03-04T15:20:40Z

I have just recieved AVNIR-2 data, level 1.1 but I cannot read them into BEAM at all.
I received the error message volume descriptor file not found - similar in Nest-C.
Is this a known issue?

RE: orthorectified ICOL product

2010-03-04T08:17:16Z

There is a workaround. You must save the product in BEAM-DIMAP format and then open the dim file in an editor.
You will find at the beginning of the file a tag similar to the following:

1...
2 <Production>
3 <DATASET_PRODUCER_NAME />
4 <PRODUCT_TYPE>MER_RR__1N</PRODUCT_TYPE>
5 </Production>
6...

Change the PRODUCT_TYPE from MER_RR__1N to MER_RR__1P.
Afterwards the orthorectification should work.

best wishes
Marco