feature: Add Cloud Optimized GeoTIFF (COG) sample #2250
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We only support COG that are generated throught this command : gdal_translate input.tif output.tif -of COG -co COMPRESS=LZW This means that we need a geotiff (with CRS) and we only support LZW compression for now. This shouldn't be too hard to support other compression like JPEG (with YUV data) or deflate.. |
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Hi and thanks for this PR! =)
In my opinion, this is a must-have feature so it is pretty nice to have started an implementation! I think we will let it as plug-in for now and integrate it in core itowns when the implementation will be mature enough.
I have a number of comments on this PR and found a number of datasets on OpenArialMaps. A lot of them failed to load since they have mask channels however!
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@Desplandis I apply your code review, can you check if everything is good for you ?
examples/js/plugins/COGSource.js
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| this.noData = (source.noData !== undefined) ? source.noData : this.firstImage.getGDALNoData(); | ||
| this.dataType = this.selectDataType(this.firstImage.getSampleFormat(), this.firstImage.getBitsPerSample()); | ||
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| this.channels = []; |
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Yes, indeed. Actually we ignore channels to prevent some bugs.
* feature: Add Cloud Optimized GeoTIFF (COG) sample * fix(cog): Fix geotiff link * refactor(COG): Apply code review * fix(COG): Use readRGB instead readRasters --------- Co-authored-by: Kevin ETOURNEAU <kevin.etourneau@sogelink.com>
Description
We need to display Cloud Optimized GeoTIFF (COG) with iTowns.
A pull request already exist about COG but it seems to be abandoned.
We tried to used PR but we got some trouble with UTIF library to parse COG.
We think geotiff is a better library to parse COG.
Motivation and Context
We need to display heavy georeferenced tif file (geotiff) which come from CAD software.
We think the best solution is to convert geotiff to COG and display it with iTowns.
Maybe it can help this discussion ?
We will change the sample url if this PR on itowns data is accepted (or maybe we don't need to change the sample url ?).