NDVI

Hi Naveed,

I Think that you don't have to worry with software in this moment, you Will need a vegetation Index, like NDVI, EVI or others.

Regards

Hi Naveed

The various indices are available in ERDAS Imagine. You can choose any one. In ENVI, you have to give the formula in Bandmath for calculating indices. Software gives the same values but you have to choose index.

Dear All,

First of all many thanks.

I am interested to use "AVHRR GIMMS NDVI3g" because this is available from 1981-2015 as i read from some literature. I have several questions in mind as follows:

1. I dont know from where I will get these data sets?

2. What is the resolutaion of these data sets?

3. Which software I should use?

Expert opinion and guide is required in this regard.

Thanks in anticipation.

Regards

Naveed

• USGS/EROS https://earthexplorer.usgs.gov/ is one of the databases to access AVHRR based NDVI from 1981 onwards for the globe https://lta.cr.usgs.gov/noaa_cdr_ndvi . The resolution is 0.05 ° Again in the same database you would find AVHRR Phenology data at 1 km resolution from 1989 onwards https://lta.cr.usgs.gov/avhrr_phen
• NASA's Ecocast is another great data source from 1982 onwards with a spatial resolution of 8 km https://ecocast.arc.nasa.gov/data/pub/gimms/3g.v0/

As far as RS/GIS software is concerned, there are both open source as well as commercially available options. It really depends on what you are most comfortable using.

Information Source: https://phenology.cr.usgs.gov/ndvi_avhrr.php

Design the algorithm of NDVI and get the results. ERDAS IMAGINE will be best.

Dear Naveed

As per your question..if you want to do some classification than you should use ENVI software.

But you can also prefer Erdas imagine for various vegetation indices.

Thanks!!

Dear James,

Thanks for your healthy information.

I have already installed arcGIS 10.5, Erdas 2015 and Envi 5.3.

I want to use above mentioned vegetation index data set for assessing vegetation cover change in high elevation cold regions, like arctic regions.

looking forward to you.

Once again healthy guide is required. If anyone have any pdf or video tutorials / guides, that will be helpful in this context.

regards, Naveed

please see the video, you will get some ideas https://www.youtube.com/watch?v=NhCh_t1DypE

Thanks Dear

All the softwares you mentioned are useful, but I think Erdas easier to calculate NDVI.

ArcGIS easier to calculate NDVI.

ARCGIS PRO AND ERDAS IMAGINE