[mapserver-users] what is the map scale value for an image with 5m pixel

jk jk.chen at sdl.usu.edu
Mon Aug 1 13:57:52 EDT 2011


Hi,

I have a layer of images each is made of pixel size 5 meter. I'm wondering
what is the minscale/maxscale value I should put in to map server map file? 

Also, I have a orginfo output that say this pixel size value of Pixel Size =
(0.019400225288651,-0.019400225288651) ,  what is the scale value for this
map?

Please pardon me for the almost-silly questions.

JK

--------------------------

Driver: GTiff/GeoTIFF
Files: overview32.tif
Size is 16000, 3552
Coordinate System is:
GEOGCS["WGS 84",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.257223563,
            AUTHORITY["EPSG","7030"]],
        AUTHORITY["EPSG","6326"]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433],
    AUTHORITY["EPSG","4326"]]
Origin = (-242.967352309208710,90.009700112644310)
Pixel Size = (0.019400225288651,-0.019400225288651)
Metadata:
  TIFFTAG_XRESOLUTION=72
  TIFFTAG_YRESOLUTION=72
  TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
  AREA_OR_POINT=Area
Image Structure Metadata:
  INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left  (    -242.967,      90.010) (242d58'2.47"W, 90d 0'34.92"N)
Lower Left  (    -242.967,      21.100) (242d58'2.47"W, 21d 6'0.36"N)
Upper Right (  67.4362523,  90.0097001) ( 67d26'10.51"E, 90d 0'34.92"N)
Lower Right (  67.4362523,  21.1000999) ( 67d26'10.51"E, 21d 6'0.36"N)
Center      ( -87.7655500,  55.5549000) ( 87d45'55.98"W, 55d33'17.64"N)
Band 1 Block=16000x1 Type=Byte, ColorInterp=Red
Band 2 Block=16000x1 Type=Byte, ColorInterp=Green
Band 3 Block=16000x1 Type=Byte, ColorInterp=Blue


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