The map projection parameter
values can be saved to and loaded from an ASCII parameter file. This
ASCII map projection parameter file can be used in programs: bl1map,bl2map,
bl3map,
mapimg and for loading SeaWiFS L3-binned products.
| Projections |
Select
the desired projection. (currently the Satellite projection is not
available) |
| Center
Lat/Lon |
Center
latitude and longitude of the projection. Value 999.0 denotes
taking the default. (Some defaults can be projection-dependent). |
| Rotation |
The
angle through which the North direction should be rotated around the line
L
between
the earth's center and the point specified in Center Lat/Lon. |
| Projection-dependent
entries |
| Central
Azimuth |
Only
available for Cylindrical, Mercator, Miller, Mollweide and Sinusoidal projections. |
| Standard
Parallels |
Only
available for the 2 conic projections: Lambert and Albers. A one
or two-element array defining the standard parallels. |
| Ellipsoid |
Only
available for Transverse Mercator projection. A 3-element array,
[a, e^2, k], defining the ellipsoid. The default is the Clarke 1866
ellipsoid.
-
a:
equatorial radius (m.)
-
e^2:
eccentricity squared (m.)
-
k:
scale on the central meridian
|
|
| Unset
Scale, Set Scale |
A
toggle specifying whether or not to specify the scale of the map projection
or the limits. Scale and Limits are mutually exclusive. |
| Scale |
If
Set
Scale is specified, then the map generated will be an isotropic
map of the ratio 1:scale and the resultant implicit limits will
depend on the Output Size specified by the user. The default is 1:100
million which is equivalent to (1 cm to 1000 km) or (1 inch to 1578 miles). |
| Lat
Limit (South, North) |
The
latitude limits of the map. |
| Lon
Limit (West, East) |
The
longitude limits of the map. |
| Isotropic |
(Note:
If Set Scale if specified, then the resultant map will automatically be
isotropic.)
| Isotropic
off |
The
map projection will stretch to fit the size specified in Output Size.
This means that the scales in the X & Y directions will most likely
be different. |
| Isotropic
on |
The
map produced will have the same scale in the X and Y directions.
This means that the map will not be stretched to fit the Output
Size and that consequently there will be an unmapped area on either
the top and bottom or left and right of the map. |
|
| Output
Size |
The
output size in pixels of the desired map [xsize, ysize]. |
| Output
Region |
The
region within the Output Size to dedicate to map generation, in
normalized coordinates. The default is to fill the entire area specified
by Output Size.
| Bot-L. |
The
normalized [x,y] coordinates of the bottom-left corner of the mapping region.
Default is [0.0,0.0]. |
| Top-R. |
The
normalized [x,y] coordinates of the top-right corner of the mapping region.
Default is [1.0, 1.0]. |
|
| Parameter
file |
The
name of an ASCII file which contains the desired map projection keyword
values.
| Load |
Load
the map projection keywords from the parameter file specified in Parameter
file. |
| Save |
Save
the entered map projection keywords to an ASCII map projection parameter
file. |
|
