Wes, IMHO your problem indicates that you are exceeding the 32bit limits for file size (I may be wrong but Total Cells: -1831011296 may indicate that).
GRASS >= 6.0 includes experimental support for reading and writing large files (> 2GB) if it is possible in your operating system. If you compile with configure [...] --enable-largefile you should be able to have raster maps which are larger than 2GB. Note that the support currently only applies to the core raster I/O code. Individual programs may or may not work with large files - please report. Markus On Jan 29, 2008 2:26 PM, Wes Kent <[EMAIL PROTECTED]> wrote: > Greetings all, > > I am trying to run r.watershed on a county-wide LIDAR data layer. > However, r.watershed returned a segment_format error during Section 1 of > the analysis. Here is the error output: > > SECTION 1 beginning: Initiating Variables. 5 sections total. > > segment_format(fd,1,-1831011296,1,25,20): illegal value(s) > > seg_open(): illegal configuration parameter(s) > > > Also, for reference, here is the information for the elevation input map > being used: > > > Type of Map: raster Number of Categories: 255 > | Data Type: > FCELL > | Rows: > 44000 > | Columns: > 55999 > | Total Cells: > -1831011296 > | Projection: State > Plane > | N: 589970.67755842 S: 479971.19725012 Res: > 2.49998819 > | E: 2226464.7485208 W: 2086468.7440966 Res: > 2.49997329 > | Range of data: min = 764.770020 max = > 1324.199951 > | > > | Data > Description: > | generated by r.patch > > > The raster layer consists of about 530 separate grids that were patched > together in stages using r.patch. The resolution of the layer is 2.50 feet. > > I am not able to determine what would have caused the error. Are there > too many rows/columns, or is the negative value for the "Total Cells" > causing a problem? Perhaps I used the wrong approach in patching the > individual grids together? > > If any additional information is needed, let me know, and I will do my > best to provide it. Many thanks for any and all assistance. > > > ~Wes _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
