I've been testing my export code and hit on a problem,
namely the referencing of rasters that I export.
Right now I do an r.out.ascii and read the header,
which essentially gives me the data from the cellhd
directory, specifically north, east, south and west
for a map.
I would like to know what is the various formats
these can be in, and specifically how negative values
are encoded in each and what non-number data
may be in there. The variation seems to stem from
the proj element, which can apparently be
unreferenced (0), UTM (1), state plane (2) and
lat-long (3). Is this true?
I've been testing my export code and hit on a problem,
namely the referencing of rasters that I export.
Right now I do an r.out.ascii and read the header,
which essentially gives me the data from the cellhd
directory, specifically north, east, south and west
for a map.
I would like to know what is the various formats
these can be in, and specifically how negative values
are encoded in each and what non-number data
may be in there.
For anything other than lat/lon, the bounds are formatted using
sprintf("%.8f") with trailing zeros removed.
For lat/lon, the bounds are in DMS, with one of the forms:
01:23:45.678N
01:23:45N (seconds are integral)
01:23N (seconds are zero)
01N (minutes & seconds both zero)
The variation seems to stem from
the proj element, which can apparently be
unreferenced (0), UTM (1), state plane (2) and
lat-long (3). Is this true?