Search found 243 matches

by OB SeaDAS - knowles
Thu Feb 18, 2021 11:43 am America/New_York
Forum: Questions/Comments
Question: gpt MosaicGeneral
Replies: 7

gpt MosaicGeneral

Hi Amita,As previously noted in this thread, rhos_412 and other surface reflectances can in fact be negative, and for that matter could be greater than 1.0 as well.  Cloud shadow and cloud tops are 2 possible instances in which this might occur.  There could be other instances.  The f...
by OB SeaDAS - knowles
Mon Jan 11, 2021 8:47 am America/New_York
Forum: Questions/Comments
Question: Creating a 250m MODIS-A quasi true colour cropped image
Replies: 6

Creating a 250m MODIS-A quasi true colour cropped image

Updating to SeaDAS 7.5.3 will fix your GUI problem regarding autofill of the extractor GUI.Alternatively, you can run this at the command line to retrieve the pixel values (using the example previously mentioned in this post).  Note in this case you will need to first generate GEO and L1B non-e...
by OB SeaDAS - knowles
Fri Jan 08, 2021 10:45 am America/New_York
Forum: Questions/Comments
Question: Creating a 250m MODIS-A quasi true colour cropped image
Replies: 6

Creating a 250m MODIS-A quasi true colour cropped image

After entering the final lat/lon textfield, try clicking on another textfield to trigger the autofill ... do the pixel textfields autofill if you do this?  The pixels values get autofilled via the "Run" button action, however you won't see it because the GUI closes and runs, so we...
by OB SeaDAS - knowles
Thu Jan 07, 2021 11:30 am America/New_York
Forum: Questions/Comments
Question: Get the value from scatter plot
Replies: 2

Get the value from scatter plot

A scatterplot cannot create or export ROI data.  You might need to clarify what you are doing and how you are exporting the data.  I do not see a region of interest vector in the image which you show.  You didn't check the ROI checkbox so your scatterplot is based on the whole ima...
by OB SeaDAS - knowles
Thu Jan 07, 2021 10:59 am America/New_York
Forum: Questions/Comments
Question: Creating a 250m MODIS-A quasi true colour cropped image
Replies: 6

Creating a 250m MODIS-A quasi true colour cropped image

To create a quasi true color plate carrée mapped image for a ROI (region of interest) within a MODIS file the following GUI steps can be done:Example file: https://oceandata.sci.gsfc.nasa.gov/ob/getfile/A2010283180500.L1A_LAC.bz2Region of interest: north=39.0, south=37.0, west=-78.0, east=-75.0 1. ...
by OB SeaDAS - knowles
Thu Jan 07, 2021 9:18 am America/New_York
Forum: Questions/Comments
Question: Draw polygon on a scatter plot in SeaDAS
Replies: 5

Draw polygon on a scatter plot in SeaDAS

The scatterplot is created from the image.  You can mask areas of the image by drawing on the image using the polygon, ellipse, ... tools.  You can then apply this mask to refine the scatterplot.  However there are no tools in SeaDAS to enable the user to draw on the scatterplot and h...
by OB SeaDAS - knowles
Wed Oct 28, 2020 11:22 am America/New_York
Forum: Questions/Comments
Question: maskcloud
Replies: 2

maskcloud

Amita,Pixels can have NaN values for products for a multitude of reasons and NaN pixels can have a multitude of flags.  You can view all the flags for a pixel by hovering over it and observing all its flag values within the Pixel info tool window (... or by placing a pin on it and using this to...
by OB SeaDAS - knowles
Mon Oct 26, 2020 10:17 am America/New_York
Forum: Questions/Comments
Question: Resampling
Replies: 3

Resampling

You can use the Collocate tool with HICO as the reference/master and VIIRS as the dependent file.  This will generate a new file containing all the raster data bands from both input files.  The pixels of the generated file will geographically match those of the L2 HICO pixel.  Since a...
by OB SeaDAS - knowles
Wed Oct 21, 2020 10:22 am America/New_York
Forum: Questions/Comments
Question: Reprojecting L1 image
Replies: 1

Reprojecting L1 image

No, you cannot reproject L1 images and then run l2gen.  All the science processors within the OCSSW menu are strict science data processors with specific input file types and formats, tracking through specific science data levels.  The other more generic GUI/GPT tools such as Reproject, Su...
by OB SeaDAS - knowles
Mon Oct 19, 2020 9:34 am America/New_York
Forum: Questions/Comments
Question: Flags and Reprojected files
Replies: 12

Flags and Reprojected files

You can apply the flag masks using the original unprojected flag by setting the following field within the Reproject operator:<maskExpression>${maskExpression}</maskExpression>The flags themselves should not be reprojected as they really have no meaning since they are tied to multiple unprojected pi...