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The Staff of SOH
Pour moi, ce n'est pas necessaire; peut etre pour les autres....AAArrggggh
I think I've made a mistake with the translator tool editing the post ,it's in french........
do you want i redo it ?
JP
If it’s only to change the altitude ,you will see it’s very easyI'm ready to dip a toe in, but it's another learning curve ...
It’s just an idea an hypothèse of work ……I remember when I did my first meshes ,five years ago, with the srtm_v1 “not corrected” ,with Blackard to erase the specking noise of the sea ,that was many in these first heights pics, It was needed to set the sea level at -3m.,that calmed the water ,flatten the sea and fix all the land 0m areas, that was showed as water previously and recognize now as land.The only problem is when some coasts extend outward at 0 elevation
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Despeckling SRTM Water Areas
One common type of problem that occurs with SRTM radar imagery over water is speckling or noise. Water surfaces generally produce radar backscatter that often results in noisy images. The surface of the DEM may thus be "speckled" with positive and negative deviations from the actual zero sea-level elevation values. (In addition, coastlines may not be well defined.) An example of this problem is shown in the first image to the right. It is a tile taken from the Eurasia data set, file number N00E073, which is somewhere in the Pacific Ocean south of Sri Lanka. There are actually two problems. The first one is that sea level is a little off, averaging about 3m. The second is the noise. Both these problems are relatively easy to fix.
The oceans can be calmed by shifting the entire data set a couple of meters closer to the center of the earth (actually, the reference geoid.) To do this, select Image|Array Operations| Offset Arrays. Enter -3m into the text field in the dialog box and hit 'Submit'. All the elevations will be decremented by this amount.
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Thanks for everyone's help & understanding. I'm sorry if people feel like we're going over old ground, but I'm new to all of this, & I need to understand how we are where we are (now I'm confusing myself)
Hmmm.... that would all be very complicated. I first want to see how LWM/shorelines created from SRTM SHP's compare with the mesh. If that is better than Rhmba's water, then it will not be necessery.Salut Sander !:salute:
Have you untersdood the message ?
It's just an idea because comparing the Dick's masks with those I did in common places ,they are more inland and lightly drop on some reliefs,hand drawing we compense that in keeping 1,2 or 3 pixels forward in the sea part ,perhaps faking the sea level to -3 m that could reproduce in automated way the corrections we do handly ,expanding the land part with these some pixels allow also to not use flattens .
JP
"....expanding the land part with these some pixels allow also to not use flattens"
:ernae:
encore, encore!