Dear Sir,
I would like to come up with spatial variation of ndvi within a specific area. I annual average ndvi of 17 years from 1998 to 2014. how can I go about it. attached is an example of what I would like to come with
When you calculate the NDVI (Normalized Difference Vegetation Index) using visible and near infrared information obtained by remote sensing you have a "spatial variation" since the NDVI. See also: Normalized Difference Vegetation Index - Wikipedia, the free encyclopedia
What does the included image represent? Is that a single year or the result of combining several years? Are you trying to seek the range of values for each pixel in the time series?
I have 17 images of NDVI data of 17 years (1998-2014), yes I would like to find the range of values for each pixel in the time series.
From time-serial images (1998 – 2014), you can define the ‘spatial variation’, in addition to ‘temporal variation’
However, advisable to use other methods like Intervention Analysis (IA)…
Iam using ArcGIS 9.3, how can I go about it, if possible may you give me steps to follow
First of all, your intention will be a research study, rather that a workflow from ArcGIS. Please refer to 'Object-oriented' Change Detection in Operation
Secondly, nice to read the paper at Variations in northern vegetation activity inferred from satellite data of vegetation index during 1981 to 1999 - Resear… Pay attention to approaches in this study
For that purpose you can use Cell Statistics to determine the range of a series of rasters (and min, max, etc): See: ArcGIS Help (10.2, 10.2.1, and 10.2.2)
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