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SRTM "grey squares" shading in the sea from zoom 9 to 11, with some maps only ...
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Hi Locus team,
Problem with SRTM :
As it happened once for me, i had some "grey squares" shadings appearing on some places in the sea.
As the problem didn't happened on my smartphone, i first transfer the hgt files from my smartphone to my tablet. Result = same troubles
So, i've deleted all hgt files in the srtm and downloaded new ones for the area (SE58, SE59, SF58, SF59) = same troubles
What is strange is that it happens from zoom 9 to zoom 11 only ... and also It happens with online maps, personal maps but not with the vector map !
Is there a cache to delete somewhere ?
Any idea to solve that ?
Thanks in advance,
Cheers
Edit : it also happens with vector map but on less areas after zoom 11
The same problem 
Good day Fifi,
before I start to test it, I need some more information.
- just for sure, write me an online map I may use for testing
- what is a source of your HGt files, so I have same data
- do you have enabled some overlays or WMS maps?
- give me please exact coordinates where should I try it, thanks
Hope this will be all I need to exactly simulate same problem on own device.
Good day Fifi,
before I start to test it, I need some more information.
- just for sure, write me an online map I may use for testing
- what is a source of your HGt files, so I have same data
- do you have enabled some overlays or WMS maps?
- give me please exact coordinates where should I try it, thanks
Hope this will be all I need to exactly simulate same problem on own device.
Hello Menion,
. For example : online OSM OpenCycleMap
. HGT Sources : http://www.viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org3.htm
. overlays or WMS maps enabled : NO
. coordinates : S 22.35903° E 167.02828°
As i said before, the thing really strange is that i don't have the problem with the smartphone ... and the HGT files are supposed to be the same ... ( i going to try to compare the two folders, /SRTM on smartphone and /SRTM on tablet, with a tool just to be sure that it is not the file explorer that has not done a mistake during the copy or the extract)
Thanks in advance,
Cheers
Hello Menion,
. For example : online OSM OpenCycleMap
. HGT Sources : http://www.viewfinderpanoramas.org/Coverage%20map%20viewfinderpanoramas_org3.htm
. overlays or WMS maps enabled : NO
. coordinates : S 22.35903° E 167.02828°
As i said before, the thing really strange is that i don't have the problem with the smartphone ... and the HGT files are supposed to be the same ... ( i going to try to compare the two folders, /SRTM on smartphone and /SRTM on tablet, with a tool just to be sure that it is not the file explorer that has not done a mistake during the copy or the extract)
Thanks in advance,
Cheers
Good day Menion,
So, i've compared the srtm folders :
1. In the smartphone, i have some files with an extension ".empty" that i don't have in the tablet
2. With a comparison tool, it appears that i had 9 files different between the 2 folders. Replacing these files in the tablet with the smartphone's ones doesn't change anything.
Question : what about these files with the ".empty" extension ? Are they necessary or not ? Have they something to do with the grey squares problem ?
I also attach the srtm folder containing hgt files that i have in the tablet if you want to try. For information, the tablet is a Samsung SM-T211
Cheers
Good day Menion,
So, i've compared the srtm folders :
1. In the smartphone, i have some files with an extension ".empty" that i don't have in the tablet
2. With a comparison tool, it appears that i had 9 files different between the 2 folders. Replacing these files in the tablet with the smartphone's ones doesn't change anything.
Question : what about these files with the ".empty" extension ? Are they necessary or not ? Have they something to do with the grey squares problem ?
I also attach the srtm folder containing hgt files that i have in the tablet if you want to try. For information, the tablet is a Samsung SM-T211
Cheers
Hello Fifi,
with your SRTM files, I've found only single "hole" in sea like on screenshot with very nice elevation in the middle. Is this what are you talking about? If not, may you post a screenshot, it should help, thanks,
Hello Fifi,
with your SRTM files, I've found only single "hole" in sea like on screenshot with very nice elevation in the middle. Is this what are you talking about? If not, may you post a screenshot, it should help, thanks,
Hahahaha what a hole you've found there !!! Yes, i have that one too on the tablet and also on the smartphone.
But have a look on the following screenshots to compare the results between the smartphone and the tablet for the coordinates i have mentioned before in my post at zoom 11 and 12 (S 22.35903° E 167.02828)
Smartphone Z12 :
Smartphone Z11 :
Tablet Z11 :
Tablet Z12 :
Hahahaha what a hole you've found there !!! Yes, i have that one too on the tablet and also on the smartphone.
But have a look on the following screenshots to compare the results between the smartphone and the tablet for the coordinates i have mentioned before in my post at zoom 11 and 12 (S 22.35903° E 167.02828)
Smartphone Z12 :
Smartphone Z11 :
Tablet Z11 :
Tablet Z12 :
Hello Fifi,
interesting. Holes in shading are caused by problems in SRTM data, not by Locus Map itself, if I remember correctly. Petr fixed by any tool all HGT files we offer over Locus Store, so this problem may not happen with "our" files.
Anyway question is why shading behave differently on your devices. Part of shading is cached in cache of Locus. Try to deleted directory Locus/cache/map/shader/ if it helps. Maybe you used different HGT files some time ago and Locus now use cached values ....
Hello Fifi,
interesting. Holes in shading are caused by problems in SRTM data, not by Locus Map itself, if I remember correctly. Petr fixed by any tool all HGT files we offer over Locus Store, so this problem may not happen with "our" files.
Anyway question is why shading behave differently on your devices. Part of shading is cached in cache of Locus. Try to deleted directory Locus/cache/map/shader/ if it helps. Maybe you used different HGT files some time ago and Locus now use cached values ....
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