Tiles too small or overlap too large for given input

Microwave Toolbox
#1

Hi!
I’m trying to create a DEM from Sentinel 1 and, after the exportation to snaphu(Radar>Interferometric>Unwrapping>Snaphu Export), I’ve tried to go to the next step following this guide.
Then I’ve copy and pasted the row of snaphu.conf into a Linux terminal(I use Ubuntu 18.04) but it’s shown me the error in object. How I can resolve?

I’ve used two SLC products of the same track.

#2

If the tile size is too small, you need to reduce the number of tile lines and rows, for example to 5. Make sure you select a different output folder for the export and run again.

grafik

#3

I’ve followed your suggestions and I’ve putted rows and columns at 5 but the message isn’t changed:

snaphu v1.4.2
27 parameters input from file snaphu.conf (84 lines total)
tiles too small or overlap too large for given input

#4

This is what the source code says about the error:

f(params->ntilerow+params->rowovrlp > nlines   
       || params->ntilecol+params->colovrlp > linelen  
       || params->ntilerow*params->ntilerow > nlines  
       || params->ntilecol*params->ntilecol > linelen){  
      fprintf(sp0,"tiles too small or overlap too large for given input\n");  
      exit(ABNORMAL_EXIT);

As the overlap is already 0, that doesn’t make much sense. How large is your exported raster in total?
Can you please upload snaphu.conf?

#5

I’m apologize with you. Now I’ve seen that I’ve copied partially the row in snaphu.conf. The row is this:

snaphu -f snaphu.conf Phase_ifg_srd_VV_19Feb2019_25Feb2019.snaphu.img 22997

I’ve copied only this part

snaphu -f snaphu.conf Phase_ifg_srd_VV_19Feb2019_25Feb2019.snaphu.img 2

This is the reason of the error. Now I’m wainting the end of the process.

#6

ah, I see. So snaphu thinks the image is only two lines large which would cause errors regarding the tile size. Good to see that it works now.