topic Re: Spatial variation of ndvi in Data Management Questions https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35718#M2003 <HTML><HEAD></HEAD><BODY><P>From time-serial images (1998 – 2014), you can define the ‘spatial variation’, in addition to ‘temporal variation’</P><P></P><P>However, advisable to use other methods like Intervention Analysis (IA)…</P></BODY></HTML> Sun, 11 Jan 2015 07:16:43 GMT larryzhang 2015-01-11T07:16:43Z Spatial variation of ndvi https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35715#M2000 <HTML><HEAD></HEAD><BODY><P> Dear Sir,</P><P>I would like to come up with spatial variation of ndvi within a specific area. I annual average ndvi of 17 years&nbsp;from 1998 to 2014. how can I go about it. attached is an example of what I would like to come with</P><P></P></BODY></HTML> Sat, 10 Jan 2015 22:06:56 GMT https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35715#M2000 RuttiaKatiyi 2015-01-10T22:06:56Z Re: Spatial variation of ndvi https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35716#M2001 <HTML><HEAD></HEAD><BODY><P>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: <A href="http://en.wikipedia.org/wiki/Normalized_Difference_Vegetation_Index" title="http://en.wikipedia.org/wiki/Normalized_Difference_Vegetation_Index">Normalized Difference Vegetation Index - Wikipedia, the free encyclopedia</A> </P><P></P><P>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?</P></BODY></HTML> Sun, 11 Jan 2015 01:26:35 GMT https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35716#M2001 XanderBakker 2015-01-11T01:26:35Z Re: Spatial variation of ndvi https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35717#M2002 <HTML><HEAD></HEAD><BODY><P>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. </P></BODY></HTML> Sun, 11 Jan 2015 05:32:43 GMT https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35717#M2002 RuttiaKatiyi 2015-01-11T05:32:43Z Re: Spatial variation of ndvi https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35718#M2003 <HTML><HEAD></HEAD><BODY><P>From time-serial images (1998 – 2014), you can define the ‘spatial variation’, in addition to ‘temporal variation’</P><P></P><P>However, advisable to use other methods like Intervention Analysis (IA)…</P></BODY></HTML> Sun, 11 Jan 2015 07:16:43 GMT https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35718#M2003 larryzhang 2015-01-11T07:16:43Z Re: Spatial variation of ndvi https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35719#M2004 <HTML><HEAD></HEAD><BODY><P>Iam using ArcGIS 9.3, how can I go about it, if possible may you give me steps to follow</P></BODY></HTML> Sun, 11 Jan 2015 09:29:25 GMT https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35719#M2004 RuttiaKatiyi 2015-01-11T09:29:25Z Re: Spatial variation of ndvi https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35720#M2005 <HTML><HEAD></HEAD><BODY><P>First of all, your intention will be a research study, rather that a workflow from ArcGIS. Please refer to&nbsp; <A href="https://community.esri.com/migration-blogpost/1557">'Object-oriented' Change Detection in Operation</A></P><P></P><P>Secondly, nice to read the paper at&nbsp; <A href="http://www.researchgate.net/publication/237945973_Variations_in_northern_vegetation_activity_inferred_from_satellite_data_of_vegetation_index_during_1981_to_1999" title="http://www.researchgate.net/publication/237945973_Variations_in_northern_vegetation_activity_inferred_from_satellite_data_of_vegetation_index_during_1981_to_1999">Variations in northern vegetation activity inferred from satellite data of vegetation index during 1981 to 1999 - Resear…</A> Pay attention to approaches in this study</P></BODY></HTML> Sun, 11 Jan 2015 12:51:44 GMT https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35720#M2005 larryzhang 2015-01-11T12:51:44Z Re: Spatial variation of ndvi https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35721#M2006 <HTML><HEAD></HEAD><BODY><P>For that purpose you can use Cell Statistics to determine the range of a series of rasters (and min, max, etc): See: <A href="http://resources.arcgis.com/en/help/main/10.2/index.html#//009z0000007q000000" title="http://resources.arcgis.com/en/help/main/10.2/index.html#//009z0000007q000000">ArcGIS Help (10.2, 10.2.1, and 10.2.2)</A> </P></BODY></HTML> Mon, 12 Jan 2015 01:17:33 GMT https://community.esri.com/t5/data-management-questions/spatial-variation-of-ndvi/m-p/35721#M2006 XanderBakker 2015-01-12T01:17:33Z