David J. Bakeman wrote:
Micha Silver wrote:
David J. Bakeman wrote:
I have some shape files that are in seconds rather than decimal
I'm not sure what you mean here. A shapefile is not "in seconds" or
"decimal degrees". The geometry part (*.shp) is a binary
representation of X-Y coordinates, as simple numbers. If the
shapefile also has a *.prj file, then that should contain its
projection information.
If you have attribute columns (in the *.dbf part of the shapefile)
with X-Y coordinates, then you can format these columns any way you
like using, for example, Openoffice Calc. But this will *have no
effect* on the geographic location of the features in the shapefile.
So, the important question is: do the shapefiles overlay correctly?
If not, then you need to reproject one shapefile to the projection of
the others.
Hope that's clear...
Sorry I didn't make myself clearer. The shapefiles are missing the
prj files and the coordinates of the geometry are in seconds for
example 72.5 34.5 would be 261000.0 124200.0. I can write a quick
program to convert since it's a simple /3600 but it seemed like I
should be able to have qgis do it for me if I could figure out the
correct proj specification. I have used the transformation plugin in
the meantime to scale the data by 1/3600.
That will be a first for me! I've never seen LON/LAT coordinates
specified in seconds.
If you're lacking a *.prj then you will have to know in advance what CRS
these shapefiles are in. Again, if you display them by assuming
everything is in Lon/Lat WGS84, do they overlay correctly?
--
Micha Silver
Arava Development Co. +972-52-3665918
http://www.surfaces.co.il
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