Calculating Plant Health and Surface Models in WebODM: Backend or Frontend?

Usama_Abbas · June 5, 2023, 5:00pm

I have been exploring the capabilities of WebODM for processing Multispecteral ortho imagery and generating Plant Health Masked Tiling. Specifically, I am interested in understanding how WebODM calculates plant health . Could someone please clarify whether these calculations are performed on the backend or the frontend of the WebODM portal?

I would appreciate any insights into the technical aspects of this process. Knowing where the calculations take place would help me better understand the performance requirements and optimize my workflow accordingly.

Saijin_Naib · June 6, 2023, 3:44am

Welcome!

They’re performed "front-end"ish:

github.com

OpenDroneMap/WebODM/blob/master/app/api/formulas.py

# Algos from https://github.com/dirceup/tiled-vegetation-indices/blob/master/app/lib/vegetation_index.rb
# Functions can use all of the supported functions and operators from
# https://numexpr.readthedocs.io/en/latest/user_guide.html#supported-operators

import re
from functools import lru_cache
from django.utils.translation import gettext_lazy as _

algos = {
    'NDVI': {
        'expr': '(N - R) / (N + R)',
        'help': _('Normalized Difference Vegetation Index shows the amount of green vegetation.'),
        'range': (-1, 1)
    },
    'NDYI': {
        'expr': '(G - B) / (G + B)',
        'help': _('Normalized difference yellowness index (NDYI), best model variability in relative yield potential in Canola.'),
        'range': (-1, 1)
    },
    'NDRE': {

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Muhammad_Usman_Shahi · June 6, 2023, 11:18am

@Sajin_Naib: could you please mention how the above mentioned formulas for indexes are applied on the runtime on the Multispecteral Orthomosaic image of drone. is that applied on the tile of Multispecteral Orthomosaic image of drone? could you please help to identify the relevant code file.

Saijin_Naib · June 7, 2023, 3:10am

Sorry, that’s not my strength. I believe it is executed in Django/Python on the front-end, but beyond that, I’m not certain.

system · July 7, 2023, 3:10am

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