Closed xxqhh closed 4 years ago
I think i have new idea,It seems that I misunderstood it before.
Is that correct?
Thank you
I guess from your code that you are trying to render RGB data (three bands). RGB rendering is documented here:
https://django-raster.readthedocs.io/en/stable/algebra.html#rgb-endpoint
The data is rendered as RGB if you specify the "keys" as r, g, and b.
If you ingested your raster as a 3-band raster, you have to reference the bands with RASTERLAYERID:BAND_INDEX
. in the url. If you ingested each band separately, simply use the rasterlayer id directly.
For accessing individual bands is documented here https://django-raster.readthedocs.io/en/stable/algebra.html#using-specific-bands
In your case, if you have 3-band rasters ingested, your url would look like this:
http://localhost:8000/raster/algebra/{z}/{x}/{y}.png?layers=r=78:0,g=78:1,b=78:2
assuming red = band0, green=band1, blue=band2
If your data is already in 8bit integers (or scaled from 0 to 255) this should render just fine. Otherwise you might have to use the scale
parameter as described in the docs.
If your image is too dark or has not a lot of saturation, you can also manipulate the rendering on the fly using the enhancement url parameters, see
https://django-raster.readthedocs.io/en/stable/algebra.html#image-enhancement
btw - @xxqhh does that mean you were able to solve the parsing problems? Please let me know if you solved the issues, so that I can make sure it does not happen to other users using conda on windows.
Eventually, it seems that the file will be opened and unreadable.I think it's better to develop with Linux
I looked through the document and found some problems.This code doesn't seem to be executable.
At the same time, I don't understand this very well.
How to determine layer_id?
The url was missing a rasterlayer id indeed. Fixed here https://github.com/geodesign/django-raster/commit/0ad8a778d3ef8b2b564c4968fa9ed01160887ed4. About the code, what part does not work for your?
Successful. I don't know why I couldn't come out before.
Hi,I have new problem。 http://localhost:8000/raster/algebra/{z}/{x}/{y}.png?layers=a=78,b=0,c=1,d=2 Is this code correct? a:layerid b:band1 c:band2 d:band3 Thank you