December 1, 2020, 12:57am
I’m getting started accessing the Process API (S2L1C) and I need to get the minimum, maximum and average ndvi from a polygon.
I’ve already getting the TIFF file with the desired colors, but I don’t know where to start to get those values in the response.
I’m using CURL and PHP.
Any help would be appreciated.
December 1, 2020, 5:09am
the easiest way is to use a dedicated API for this -
The other option is using updateOutputMetadata function of the custom script as demonstrated in Tip 6 in this blog:
December 1, 2020, 10:40am
Thanks for your quick response.
I`ll try both today.
December 1, 2020, 11:32pm
Thanks again for your response.
I’m trying to use Statiacical API, but when I changed the region using GEOMETRY the response was empty.
Actually I needed to add RESX and RESY to my request as well.
http://services.sentinel-hub.com/ogc/fis/4f9e0919-3206-MASKED?LAYER=VEGETATION-INDEX-NDVI&STYLE=INDEX&CRS=EPSG:3857&TIME=2018-11-15%2F2020-05-15&GEOMETRY=POLYGON((-54.08952876561413 -27.98739282040455,-54.08336551369231 -27.98760544600711,-54.08459142114501 -27.98144772947314,-54.08738735387322 -27.97536276995694,-54.08843974280309 -27.97533191400677,-54.08908634398883 -27.97588577227436,-54.09016603092668 -27.97696274098633,-54.09139788028573 -27.97760384874638,-54.08986613010527 -27.98277768003278,-54.08952876561413 -27.98739282040455))&MAXCC=5&RESX=512&RESY=512
Any ideas why is it happening?
December 2, 2020, 6:14am
There are several problems in your request:
CRS is defined as EPSG:3857, yet your geometry is provided in EPSG:4326
geometry should be provided in latitude/longitude order
RESX and RESY should not appear in Statistical API, used RESOLUTION instead
RESOLUTION should be provided in the same units as the CRS, e.g. in degrees in your case; there is an exception in case of Statistical API, that you can use RESOLUTION=10m if you want us to give a best try to convert these “10 meters into degrees at your latitude”
Applying all of this you get a request, that works:
http://services.sentinel-hub.com/ogc/fis/4f9e0919-3206-4690-MASKED?LAYER=VEGETATION-INDEX-NDVI&STYLE=INDEX&CRS=EPSG:4326&TIME=2018-11-15%2F2020-05-15&GEOMETRY=POLYGON((-27.98739282040455 -54.08952876561413, -27.98760544600711 -54.08336551369231, -27.98144772947314 -54.08459142114501, -27.97536276995694 -54.08738735387322, -27.97533191400677 -54.08843974280309, -27.97588577227436 -54.08908634398883, -27.97696274098633 -54.09016603092668, -27.97760384874638 -54.09139788028573, -27.98277768003278 -54.08986613010527, -27.98739282040455 -54.08952876561413))&MAXCC=5&RESOLUTION=10m
Note that I have masked part of your instance ID to prevent other readers of this forum to abuse it.
December 2, 2020, 11:12am
I already tested here and it’s working fine.
Thank you for your help
April 12, 2021, 5:11pm
Did you have any examples of the kinds of results were generated here?