Problem of Range Doppler Terrain Correction

Microwave Toolbox
24

i have the same issue. my study area on a coastal region.after i made terrain correction for RADARSAT-1, i got blank image.

i used SRTM 1arc and 3arc, the results are same no change.

i made update for all new features and tools and install them-restart. the problem is still existed

25

Have you tried un-checking ā€œremove areas without elevationā€?

26

Hi! I have the same problem the image is black, but I am analyzing the coast. Could someone tell me which geometric correction is better for coasts and oceans?

image

27

to prevent the cropping of water, you have to select ā€œMask areas without elevationā€ in the Range Doppler Terrain Correction

grafik

1 Like
28

Hi everyone.
I wanna implement Range-Doppler Terrain correction on Sentinel-1 data. but the region donā€™t have SRTM DEM for auto download
what should I do for correct TC?
Thanks in Advance

29

where is your study area located?

30

I use the Range Doppler Terrain Correction operator to get the result shown in the figure below. What is the reason?

image
image1007Ɨ571 127 KB

31

this looks like a result from the offset tracking. Are you concerned about the red squares or the missing line? Please specify.

34

This is the result of the pixel offset calculation. Some lines are missing after using the TC operator.

35

Which DEM was used for Terrain Correction?
Have you disabled ā€œmask areas without elevationā€?
Which DEM Resampling did you select?

36

The following picture is my choice:

image
image773Ɨ797 126 KB

Occasionally there will be problems with missing lines/

37

what happens if you select Nearest Neighbor for DEM Resampling?

38

ļ¼ˆ1ļ¼‰When setting:
DEM Resampling method:Nearest Neighbor
Image Resampling method:Bilinear Interpolation
The result is the same, missing lines.
ļ¼ˆ2ļ¼‰But when setting:
DEM Resampling method:Nearest Neighbor
Image Resampling method:Nearest Neighbor
There are no missing lines in the results.

image
image1021Ɨ514 158 KB

(So my problem is solved)

39

my field study located in Iran

40

you can try if ALOS World DEM delivers better results for terrain correction. It can be downloaded freely (after registration) here: https://www.eorc.jaxa.jp/ALOS/en/aw3d30/index.htm
You can use it as an external DEM (GeoTiff in WGS84)

41

ALOS provides DSM. Is it ok to use DSM instead of DEM?

42

shouldnā€™t make much differenceā€¦

44

I did the same steps and the problem with blank image occured. I tried to run terrain correction using SRTM 1Sec, SRTM 3Sec and external DEM. In every case the result of the process is blank image. Moreover, when I unchecked the option ā€œmask out areas without elevationā€ the following error occured: ā€œA problem occured during the target product initialisation. Type: operatorException Message: source product should not be map projectedā€.
I would appreciate it if you could give me some advice. Thank you!