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DougMatthews

SRTM to BGL by Matthew Styles

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Hi allAvsim's Scenery design introduction says i should download that prgoram to convert srtm data to Mesh, but there is no link ,and i could not find where can i get it...Anyone could tell me plese?I would be glad if someone could also tell me where to get fsdem...Thanks

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We (ACES) made significant use of SRTM data in FSX. Be aware that there were issues with SRTM data that required a significant amount of work for our data team to remedy. -Doug

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Hi Doug,thanks for stopping by ;-)Indeed, the SRTM source data can be quite buggy and often require pre- or post-processing to make them useful in FS.I don't suppose you (ACES) used any of Jonathan de Ferranti's corrections? They are by far the best enhancements to SRTM I've seen because he corrects voids and spikes with topographic data rather than using interpolation or smoothing algorithms. Anyone working with SRTM data should check whether Jonathan has provided an updated version of the area or interest: http://www.viewfinderpanoramas.org/I've also noticed that the SRTM v3 5x5 degree tiles, offered by CGIAR - http://srtm.csi.cgiar.org/index.asp - can be pretty poor. It appears that they used "simple" interpolation algorithms, which, in areas with larger voids, lead to unsightly artefacts. I only looked at a couple of tiles in the Himalayas but I definitely wouldn't want to use those for FS terrain mesh.For areas in which we need to interpolate across voids my own tests showed that Jim Keir's "Slartibartfast" offers the most believable results: http://www.jimkeir.co.uk/FlightSim/index.html Cheers, Holger

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Holger -I'll probably be around here and at FSDeveloper periodically. I appreciate your efforts to dampen some of the wild speculation and incredulity with reason and fact.Not sure exactly what our team did to doctor up the SRTM we used. I just wanted the poster to be aware that raw SRTM data has its issues, as well as know that in many areas the best results available by this mechanism would be quite similar to what's already in the box.-Doug>Hi Doug,>>thanks for stopping by ;-)>>Indeed, the SRTM source data can be quite buggy and often>require pre- or post-processing to make them useful in FS.>>I don't suppose you (ACES) used any of Jonathan de Ferranti's>corrections? They are by far the best enhancements to SRTM>I've seen because he corrects voids and spikes with>topographic data rather than using interpolation or smoothing>algorithms. Anyone working with SRTM data should check whether>Jonathan has provided an updated version of the area or>interest: http://www.viewfinderpanoramas.org/>>I've also noticed that the SRTM v3 5x5 degree tiles, offered>by CGIAR - http://srtm.csi.cgiar.org/index.asp - can be pretty>poor. It appears that they used "simple" interpolation>algorithms, which, in areas with larger voids, lead to>unsightly artefacts. I only looked at a couple of tiles in the>Himalayas but I definitely wouldn't want to use those for FS>terrain mesh.>>For areas in which we need to interpolate across voids my own>tests showed that Jim Keir's "Slartibartfast" offers the most>believable results:>http://www.jimkeir.co.uk/FlightSim/index.html >>Cheers, Holger

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