Chapter 8 Updates
f you have questions or find that updates introduce errors, please post an issue in the VICAL GitHub repository - if you don’t have a GitHub account, email Sergio at: jimenez.sergio@inifap.gob.mx.
8.1 May 02, 2022
-The user can enter the URL (ID) of a vector file uploaded from GEE. -The digitized polygon can be exported in .kml. format
8.2 September 15, 2022
Vegetatión index: The Green Chlorophyll Vegetation Index (GCVI) was added \[ GCVI = \frac{NIR}{G}-1; \]
Figure 8.1: GCVI map
8.3 October 4, 2022
Select the satellite and sensor:For the first option, the user can select if he wants to work with the complete Landsat image collection (5,7, 8 and 9) or separately. If the options “L-5 and L-7” and “L-8 and L-9” is selected, ETM+ data are spectrally adjusted to OLI spectral bands using Roy et al., (2016). If only one of the two options (“L-5 and L-7” and “L-8 and L-9”) is selected, no spectral adjustment is made.
Figure 8.2: Landsat Satellite Image Collection
8.4 November 1, 2022
The user can calculate the statistical values of the vegetation index in each pixel, all the images found in the defined interval are used. The options are shown in the following Figure. For the NONE option, the vegetation index (VI) is calculated for each pixel and for each image found in the defined interval. A list of images is displayed, therefore it is possible to calculate the VI time series and download the images by date.
Figure 8.3: statistical value options
Figure 8.4: Statistical pixel values from November 2021 to November 2022
