[GRASSLIST:111] Re: 5.0.0pre3 to 5.0.2 conversion problem

[Michael Ash]

Dear Mike

Thank you for the interest in my difficulties.


> What happens when you substitute "x0" for the "PNG" driver?

The PNG driver is not the source of the problem.  I tried the script with d.mon start=x0, etc., instead of PNG and had the same problems.

> What computer/CPU/OS?

Intel (Pentium II or something) Dell Inspiron 4100/Windows XP/Cygwin/xfree86

> No data format changes should have occurred between those two versions.  I'm
> wondering whether there is a difference in the region or projection/datum
> handling leading to attempts to retrieve data out of the region.

GRASS 5.0.2 displayed maps that looked about right in terms of the geographic layout.  Resetting the region worked as I expected, etc.  The raster values seemed out of whack:
in one raster map, the values were right according to d.what.rast but the non-null cells were all white instead of color-graded; and the values were all wrong (huge negative numbers, long strings of numbers) in another raster map; in most of the maps the color scheme had changed.  (It almost looked as if GRASS was changing datatypes.)

> Have you tried recreating the project with the new version of Grass.

This is an excellent suggestion, and I have not, but I will.  The project is computationally intensive (lots of smoothing); so I need to set aside time for me and the computer.

I have done new work in 5.0.2 since you posted it and everything has been a-ok.


Thanks again for your interest and suggestions.

Best,

Michael Ash
mash at econs.umass.edu