maplab
Add Mapping group to the labels of a cube
The maplab application is used to geo-reference a map-projected cube by adding or updating the Mapping Group with projection and geo-referencing information. Maplab takes as input a map-projected cube and a map file. The user has the option to geo-reference by (LATITUDE,LONGITUDE)-coordinates or by (X,Y)-map-projected-coordinates that correspond to a given (SAMPLE,LINE)-coordinate in the input cube.
The map file must contain information pertaining to the specifics of the cube's map-projection parameters, along with the target, body radius, longitude direction, latitude type and scale. We suggest running the maptemplate program to generate the map file provided as input.
NOTE that when selecting a SAMPLE and LINE for referencing known coordinates to a pixel, pixel coordinate (0.5, 0.5) is the top-left corner of the top-left pixel in the cube. By extension, (1.0, 1.0) is the center of the top-left pixel, and (1.5, 1.5) is the lower-right corner of the top-left pixel.
Categories
History
| Jeannie Walldren | 2008-01-17 | Original version |
| Christopher Austin | 2008-04-18 | The input map will now use pixels/degree if no pixel resolution is found. If neither are present, throws an error. Both PixelResolution and Scale (pixels/degree) keywords will be in the output. |
| Travis Addair | 2009-11-06 | Added error checking to ensure that the provided map file has all the necessary keywords for later processing, and enhanced documentation to discuss necessary keywords and pixel coordinates. |
| Mackenzie Boyd | 2011-04-11 | Changed parameter LONG to LON, removed duplicate code. |
| Tracie Sucharski | 2012-12-06 | Changed to use TProjection instead of Projection. References #775 |
Parameters
Input Files
The cube whose label will be updated with Mapping Group information.
| Type | cube |
|---|---|
| File Mode | input |
| Filter | *.cub |
File containing map projection parameters.
| Type | filename |
|---|---|
| File Mode | input |
| Filter | *.map |
Input Values
The SAMPLE coordinate in the cube that corresponds to a known
(X,Y) or (LATITUDE,LONGITUDE) coordinate. In ISIS, the upper-left
corner of the upper-left pixel has coordinate 0.5.
| Type | double |
|---|
The LINE coordinate in the cube that corresponds to a known
(X,Y) or (LATITUDE,LONGITUDE) coordinate. In ISIS, the upper-left
corner of the upper-left pixel has coordinate 0.5.
| Type | double |
|---|
A list of the different types of coordinates allowed by the
application.
| Type | string | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Default | XY | |||||||||
| Option List: |
|
The map-projection X-coordinate, in meters, corresponding to the
the given (SAMPLE,LINE) coordinate of the cube.
| Type | double |
|---|
The map-projection Y-coordinate, in meters, corresponding to the
given (SAMPLE,LINE) coordinate of the cube.
| Type | double |
|---|
Latitude coordinate, in decimal degrees, for the given
(SAMPLE,LINE) coordinate of the cube. It must be in the same
LatitudeType listed in the map file.
| Type | double |
|---|
Longitude coordinate, in decimal degrees, for the given
(SAMPLE,LINE) coordinate of the cube. It must be in the same
LongitudeDomain listed in the map file.
| Type | double |
|---|
Example 1
GeoTiff Header
Most outside applications use the top left pixel (either upper-left edge
or center) to define their location in X, Y. For example, a GeoTiff with
an internal header, uses the upper left edge and for an example may
report: Upper Left (2883258.0, 979924.0) -- meaning (X, Y). Thus for
maplab, one would need to use the same top left corner of the pixel for
ISIS, as illustrated in the command line below.
Command Line
Mapping the upper-left of an ISIS cube (0.5, 0.5) to the upper left of
the example image (2883258.0, 979924.0).
maplab from=input.cub map=projection.map sample=0.5 line=0.5 x=2883258.0 y=979924.0
Data Files
Links open in a new window.Example 2
GIS Worldfile
A typical image that has a "GIS Worldfile", in contrast to an internal
GeoTiff header, uses the center of the top left pixel to define its
location in X, Y. Thus a Worldfile might look like myImage.wld or *.tfw,
*.jgw, *.pgw (depending on image type):
2.0 Cellsize in X (meters)
0.0 rotation/skew (normally 0)
0.0 rotation/skew (normally 0)
-2.0 Cellsize in Y (meters)
-24243.731055 Upper-left pixel center X (meters)
815863.281183 Upper-left pixel center Y (meters)
Thus for this example the user would need to run the program with the
command line that follows.
Command Line
Mapping the center of the upper-left pixel of an ISIS cube (1.0, 1.0)
to the center of the upper left of the example image (2883258.0,
979924.0).
maplab from=input.cub map=projection.map sample=1 line=1 x=-24243.731055 y=815863.281183
Example 3
Simple Cylindrical Global Case
Say the global file is 1440x720 or 4ppd (and perfectly 0 to 360 lon and
-90 to 90 lat). This global case would be run as follows.
Command Line
Or assuming clon is set to 180, > maplab ... sample=720.5 line=360.5
x=0 y=0
maplab from=input.cub map=projection.map sample=0.5 line=0.5 coordinates=latlong lon=0 lat=90
Example 4
Polar File
Generally one will try to bring in a polar file which is 0 to 360 lon,
extends to a common lat range, and centered at the pole (clat = 90 or
-90). Nothing about the extent in meters is needed if the center of the
image is again 90 or -90 lat. Again GIS/RS application will still
to the upper left pixel but manually this can be harder to use
than just using the center which will be defined as X,Y = 0,0 when in a
Polar or Lambert Azimuthal projection. Using an example where the polar
image is 2000 lines by 2000 samples then the run would look like:
Command Line
Assuming clat is 90 or -90.
maplab from=input.cub map=projection.map sample=1000.5 line=1000.5 x=0 y=0