search

CMU-CREATE-Lab / data-visualization-tools

EarthTime, and various data visualization libraries
Other
14 stars 5 forks source link

Landsat Sharpening Not Present in 2019 data #159

Open jjkohler opened 4 years ago

jjkohler commented 4 years ago

golden image https://golden.earthtime.org/explore#waypoints=1heLmeuPp7j4itr0cK8H4chugOpp7cU8p_VEB9CFfPlY.0&v=-10.99506,-61.19203,8.525,latLng&t=3.24&ps=100&l=blsat&bt=19840101&et=20161231&startDwell=0&endDwell=0

Staging image https://staging.earthtime.org/explore#waypoints=1heLmeuPp7j4itr0cK8H4chugOpp7cU8p_VEB9CFfPlY.0&v=-11.04999,-61.18178,8.345,latLng&t=0.08&ps=90&l=blsat,wdpa&bt=19840101&et=20191231&startDwell=0&endDwell=0 Land Sat imagery still loading in at decreased resolution.

_Originally posted by @jjkohler in https://github.com/CMU-CREATE-Lab/data-visualization-tools/issue_comments/705670281_

jjkohler commented 4 years ago

Per @pdille

I took a peek and this is all coming back to me now.

First off, we are looking at two different datasets in our Landsat comparisions:

Golden is using 2016 data: https://storage.googleapis.com/earthengine-timelapse/herwig/earthtime_annual_1984_2016/v14/1068x600/1/0/0.mp4

Staging is using 2019 data: https://storage.googleapis.com/timelapse-test/tmp/herwig/export/cmu_20200106_resampled/1068x600/1/0/0.mp4

I'm recalling again Chris H. saying that he previously (back in 2016) had full control over ffmpeg settings and was able to apply various sharpening filters. (this is why 2016 set looks almost too sharp) This is no longer the case now at Google and they are forced to use company wide settings and can only modify things like fps and dimensions.

pdille commented 4 years ago

If we want, we could run our own post sharpen filter on the tiles. I spent 30 seconds and got this result (right side is the sharpened version):

https://lh3.googleusercontent.com/-53pyVZi1Pl4/X4eUhCItBAI/AAAAAAAAVBk/BCmrKS_Yp-01jlU85GeFHCrP92ASAz0QwCK8BGAsYHg/s0/2020-10-14.png

Of course the downside is that we would have to host from our own Google bucket, which may be undesirable.... Would also take a bit to run through all 12 levels of tiles.