How to view specific NASADEM files?

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claudiogeop
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Joined: Tue Jun 16, 2020 11:30 am America/New_York

How to view specific NASADEM files?

by claudiogeop » Tue Jun 16, 2020 11:36 am America/New_York

How to view specific NASADEM files?
I have the following files with the extensions listed below and I would like to view them.

.aspect
.planc
.profc
.slope
.swb
by LP DAAC - jwilson » Tue Jun 23, 2020 8:39 am America/New_York
Greetings,
The NASADEM_SC data layers are considered generic binary files with no header information. These data files can be described manually for importing into most GIS software packages such as ArcGIS, ENVI or ERDAS and the open source MultiSpec software as well.

The .aspect and .slope binary files are described as:
3601 columns by 3601 rows
1 band
No header records or header bytes
Unsigned 16-bit integers
Byte order is IEEE, with most significant bit or big endian order

The .planc, .profc and .swb have the same characteristics with the exception of the data types:
The .planc and .profc are 32-bit floating point
The .swb is 8-bit or byte

We hope this helps! Let us know if you have any further questions.
Best regards,
Janice
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LP DAAC - jwilson
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Re: How to view specific NASADEM files?

by LP DAAC - jwilson » Mon Jun 22, 2020 2:04 pm America/New_York

Greetings,

The NASADEM_SC dataset at: https://lpdaac.usgs.gov/products/nasadem_scv001/ are generic binary files as well (like HGT).

Once we have additional guidance on how to view the following NASADEM extensions from our science data specialist, I will send it to you.
.aspect
.planc
.profc
.slope
.swb

Best regards,
Janice

claudiogeop
Posts: 3
Joined: Tue Jun 16, 2020 11:30 am America/New_York

Re: How to view specific NASADEM files?

by claudiogeop » Tue Jun 23, 2020 6:32 am America/New_York

Greetings, I look forward to that return.


Best regards,
Cláudio

LP DAAC - jwilson
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Re: How to view specific NASADEM files?

by LP DAAC - jwilson » Tue Jun 23, 2020 8:39 am America/New_York

Greetings,
The NASADEM_SC data layers are considered generic binary files with no header information. These data files can be described manually for importing into most GIS software packages such as ArcGIS, ENVI or ERDAS and the open source MultiSpec software as well.

The .aspect and .slope binary files are described as:
3601 columns by 3601 rows
1 band
No header records or header bytes
Unsigned 16-bit integers
Byte order is IEEE, with most significant bit or big endian order

The .planc, .profc and .swb have the same characteristics with the exception of the data types:
The .planc and .profc are 32-bit floating point
The .swb is 8-bit or byte

We hope this helps! Let us know if you have any further questions.
Best regards,
Janice

claudiogeop
Posts: 3
Joined: Tue Jun 16, 2020 11:30 am America/New_York

Re: How to view specific NASADEM files?

by claudiogeop » Tue Jun 23, 2020 10:23 am America/New_York

Perfectly, I will be carrying out some tests, once again thank you and if there is any difficulty return.

Best regards,
Cláudio

claudiogeop
Posts: 3
Joined: Tue Jun 16, 2020 11:30 am America/New_York

Re: How to view specific NASADEM files?

by claudiogeop » Wed Jun 24, 2020 9:33 am America/New_York

I was able to open the images in MultiSpec regarding the .slope / .swb formats, unfortunately it did not come georeferenced. When I open the same .hgt file the month already has the location defined. Are these images not georeferenced in the original format?
Last edited by claudiogeop on Wed Jun 24, 2020 11:11 am America/New_York, edited 4 times in total.

LP DAAC - jwilson
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Re: How to view specific NASADEM files?

by LP DAAC - jwilson » Fri Jun 26, 2020 8:02 am America/New_York

Our subject matter expert sent the following: If only using MultiSpec – if so, not sure if it is possible to set the coordinates in MultiSpec
It is true, the NASADEM_SC data files are not geo-referenced and will need to be done manually as well.

This is also true for the NASADEM_SIM, NASADEM_SSP and NASADEM_SHHP datasets.

The coordinate system is considered to be geographic in decimal degrees of latitude and longitude
The coordinate system can also be defined as ESPG:4326 in most GIS software packages
The spatial resolution is 0.000277777777777778 decimal degrees
The data files are in tiles of 1 x 1 degrees

For an explanation to manually geo-reference the data files, let’s use the example of:
n32w105.slope (or .planc, .profc, .swb)

The “n32w105” in the filename refers to the lower left coordinate of the data file.
The other three corners can be determined by using the lower left coordinate:
LL = 32, -105
UL= 33, -105
UR = 33, -104
LR = 32, -104

Hopefully this helps!

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