From this link here - http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3/users_guide_chap3.htm#_Writing_Static_Data I wrote code in java to transform SRTM3 data into WRF geogrid data. I read the SRTM3 file data and rewrote it south to north as a 2-dimensional array of unsigned integers. However this part of the data transformation that requires me to rename 5835 .hgt files for Eurasia obtained from here - http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/Eurasia/ is not clear.
I need to extract xstart and xend as well as ystart and yend. While code samples are not required I am more interested in understanding what those variables refer to and how they can be extracted from the .hgt files. Please let me know if my question requires more clarity or needs to be reframed.