SRTM displacement doesn't match google earth elevation

[carmandale]

blender 2.83 MacOS

SRTM data doesn't match google earth. Mountain is not as tall as in google earth

go to 48°57'21.33"N and 114° 4'45.39"W and compare to google earth

[domlysz]

altitudes values are corrects. For example the Chapman Peak has an elevation of 2868m, on the mesh I found 2816 which is very close considering SRTM data have a pixel width of 90m.

[carmandale]

This is how it looks in google earth

https://www.dropbox.com/s/xut5fbo0auypz8r/Screen%20Recording%202020-03-19%20at%205.59.11%20PM.mov?dl=0 https://www.dropbox.com/s/xut5fbo0auypz8r/Screen%20Recording%202020-03-19%20at%205.59.11%20PM.mov?dl=0

And this is how the same place looks in blender

https://www.dropbox.com/s/jvgco1k53u687k7/Screen%20Recording%202020-03-19%20at%206.01.13%20PM.mov?dl=0 https://www.dropbox.com/s/jvgco1k53u687k7/Screen%20Recording%202020-03-19%20at%206.01.13%20PM.mov?dl=0

It feels a lot flatter.

On Mar 19, 2020, at 5:48 PM, domlysz notifications@github.com wrote:

altitudes values are corrects. For example the Chapman Peak has an elevation of 2868m https://en.wikipedia.org/wiki/Chapman_Peak, on the mesh I found 2816 which is very close considering SRTM data have a pixel width of 90m.

https://user-images.githubusercontent.com/5639024/77121021-8594f280-6a3a-11ea-989c-524e9d4b3428.png — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/domlysz/BlenderGIS/issues/299#issuecomment-601452082, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAR5OE7BWF2GJRTWGGYG6Y3RIKOLZANCNFSM4LPVK5JQ.

[domlysz]

Depending of the location Google use a range of elevation data sources in higher resolution than SRTM. That's why the model look nicer in Earth. Especially in areas with very high slope, low resolution data will tend to smooth the reality of the slope. However the model in Blender is correct with true elevation values, but the resolution is just too low for mapping high mountain slope with precision.

[carmandale]

Do you know of any way to get the higher detail data? Thanks, Dale

On Mar 20, 2020, at 2:08 AM, domlysz notifications@github.com wrote:

Depending of the location Google use a range of elevation data sources in higher resolution than SRTM. That's why the model look nicer in Earth. Especially in areas with very high slope, low resolution data will tend to smooth the reality of the slope. However the model in Blender is correct with true elevation values, but the resolution is just too low for mapping high mountain slope with precision.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/domlysz/BlenderGIS/issues/299#issuecomment-601562505, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAR5OE6YRTSYTMV7LN5TB4TRIMI6JANCNFSM4LPVK5JQ.

[domlysz]

BlenderGIS can import any kind of Digital Elevation Model in Geotiff format, this is one the core functionnality, but I can't provide datasource for you (SRTM is common, worldwide and free, that's an exception). Available datasource depends on your location and the price you're willing to pay. Maybe start by looking at USGS productions.