Latest Contributions by changkx

‎07-26-2017

I wan to calculate trend analysis of MODIS-NDVI data by Hurst exponent, but I feel puzzled at the results, it seems wrong. The Hurst exponent, proposed by the British hydrologist Hurst, is estimated using R/S analysis and is an effective way of measuring the long-time dependence of a time series. The main principles are as follows (John et al., 2008). I have attached the Python Script and NDVI data.

‎07-19-2017

Thanks. I have checked my RList seriously and removed the 'X_3_3.tif', but the problem still exists. Finally, I scaled the values to integer (Int("X_2_3.tif" * 100)) then determining the range, it works. Thank you for your patience and help.

‎07-19-2017

Thanks for your help, I calculate one RList as follows alone, but the results are still 0. If it exists a nodata value, the parameter ‘DATA’ was explained in the arcgis help. DATA —At the processing cell location, if any of the input rasters has NoData, then that NoData value will be ignored. The statistics will be computed by only considering the cells with valid data. This is the default. I have attached the RList：ndvi_R.zip - Google Drive

‎07-18-2017

I want to calculate the range sequence, the Python script as follow： #ndvi_R = CellStatistics(RList, "RANGE", "DATA")the results are 0, but when I run as follows, it's correct. ndvi_MAX = CellStatistics(RList, "MAXIMUM", "DATA") ndvi_MIN = CellStatistics(RList, "MINIMUM", "DATA") ndvi_R = ndvi_MAX - ndvi_MIN

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Latest Contributions by changkx

hurst exponent

Re: arcgis cellstatistics (range) error

Re: arcgis cellstatistics (range) error

arcgis cellstatistics (range) error