Raster Soviet Topo Maps

[Stephen Woodbridge]

Hi all,

I have downloaded some Soviet Topo maps and I want to use them with 
mapserver. I can clip the collar off them, and probably shove the pixels 
into a rectangle, the scans are slightly rotated.

so for example a 50K Topo 050k--h36-022-2.gif

Processing file: 050k--h36-022-2.gif
   Width=2949, Height=2340
      top: 2793, off: 6
    right: 2192, off: -1
   bottom: 2798, off: -8
    right: 2190, off: 6

where the numbers above are in pixels and the off: value is offset for 
that edge from horizontal or vertical wrt the opposite end.

It has corner values in lat/lons.
   34.750000, 31.500000, 35.000000, 31.666667

Projection: Gauss Kruger
Datum: Pulkovo 1942
Ellipsoid: Krassovsky 1940

I assume this is a UTM projection, so how would I convert these values 
for use in a wld file?

What values should go into the world file? degrees or meters?
  pixel X size = 0.25 / 2793 degrees
  rotation about the Y axis (usually 0.0)
  rotation about the X axis (usually 0.0)
  negative pixel Y size = - (10./60.) / 2192 degrees
  X coordinate of upper left pixel center = 35.0 degrees
  Y coordinate of upper left pixel center = 31.5 degrees

What should the mapserver projection be?

# Pulkovo 1942 / Gauss-Kruger CM 33E
<2496> +proj=tmerc +lat_0=0 +lon_0=33 +k=1.000000 +x_0=500000 +y_0=0 
+ellps=krass +units=m +no_defs  <>

# Pulkovo 1942 / Gauss-Kruger zone 6
<28406> +proj=tmerc +lat_0=0 +lon_0=33 +k=1.000000 +x_0=6500000 +y_0=0 
+ellps=krass +units=m +no_defs  <>

# Pulkovo 1942 / Gauss-Kruger 6N
<28466> +proj=tmerc +lat_0=0 +lon_0=33 +k=1.000000 +x_0=500000 +y_0=0 
+ellps=krass +units=m +no_defs  <>

or a 3-degree variant?

If I have a bunch of these, do they all need to be the same size in 
pixels or can I just square up the corners as scanned and compute x-cell 
size and y-cell sizes based on the scanned size?

I could use a little help on this one, I think I am close.

Thanks,
   -Steve W