...and would be so nice having a GUI in QGIS for gdal_rasterize and the
rest of
gdal utilities!
Agus
Jamie Adams wrote:
You could create a polygon in qgis (or some automated way), find an
unused pixel value in the chart, and then use gdal_rasterize -i to
burn it into the collar area. You
Chris h ha scritto:
Just a long shot question. I have a number of NOAA charts that I would like
to
remove the collars from. Is there any combination of plugins and methods
available for qgis that would allow me to accomplish this task.
sorry about my ignorance, but what is a map collar?
Chris h ha scritto:
No apology necessary. Map collars are the white borders around maps that are
typically distributed from governmental sources in raster format. In order to
stitch or glue charts together you need to remove the collars. (white area)
Oh, that can be easy: for displaying
Although, this approach can be problematic if white is important for
properly displaying the map information. E.g., USGS topographic maps
use a white background for the map and a white collar. My solution was
to hand select the collar in Gimp, make it a unique color (magenta or
something),
I realize this goes into other software on a qgis list, but I wonder
with GDAL or GRASS one can accomplish this.
It is really a raster clip that would work well, especially if the
next step is mosaic'ing the rasters. Are these quad maps?
Mark
On Mar 18, 2009, at 3:28 PM, John C. Tull
On Wednesday 18 March 2009 16:07:18 MS wrote:
I realize this goes into other software on a qgis list, but I wonder
with GDAL or GRASS one can accomplish this.
It is really a raster clip that would work well, especially if the
next step is mosaic'ing the rasters. Are these quad ma
The charts
You could create a polygon in qgis (or some automated way), find an unused
pixel value in the chart, and then use gdal_rasterize -i to burn it into the
collar area. You can then use that as the transparency value.
On Wed, Mar 18, 2009 at 3:32 PM, Chris h chris...@magma.ca wrote:
On Wednesday
Greets:
Just a long shot question. I have a number of NOAA charts that I would like to
remove the collars from. Is there any combination of plugins and methods
available for qgis that would allow me to accomplish this task.
Best regards and thanks.
--
/ch
