When I try to mosaic landsat images(just one band) which belong to adjacent
path-rows they do not mosaic properly. It appears as in the attached
screenshot. I have tried changing the order of images but just the
overlapping image changed. I have tried r.patch as well as i.image.mosaic
with region encompassing both the scenes. However if I mosaic the same
images in ERDAS Imagine there are no issues. Mosaiced image will be simply
perfect except for brightness differences. ERDAS also provides options like
histogram matching to sort out such issues. So what is the way to mosaic
images in GRASS? Also is there any way to use specify options like
resampling, histogram matching in the process?
When I try to mosaic landsat images(just one band) which
belong to adjacent
path-rows they do not mosaic properly. It appears as in the
attached
screenshot. I have tried changing the order of images but
just the
overlapping image changed. I have tried r.patch as well as
i.image.mosaic
with region encompassing both the scenes. However if I
mosaic the same
images in ERDAS Imagine there are no issues. Mosaiced
image will be simply
perfect except for brightness differences. ERDAS also
provides options like
histogram matching to sort out such issues. So what is the
way to mosaic
images in GRASS? Also is there any way to use specify
options like
resampling, histogram matching in the process?
the d.what.rast or the query tool to check to see if the black image
boundaries are in fact NULL, or if they are 0. If they are 0 use the
r.null module to set them to NULL, then try again.
On Tue, Mar 8, 2011 at 10:45 AM, Hamish <hamish_b@yahoo.com> wrote:
Chethan wrote:
When I try to mosaic landsat images(just one band) which
belong to adjacent
path-rows they do not mosaic properly. It appears as in the
attached
screenshot. I have tried changing the order of images but
just the
overlapping image changed. I have tried r.patch as well as
i.image.mosaic
with region encompassing both the scenes. However if I
mosaic the same
images in ERDAS Imagine there are no issues. Mosaiced
image will be simply
perfect except for brightness differences. ERDAS also
provides options like
histogram matching to sort out such issues. So what is the
way to mosaic
images in GRASS? Also is there any way to use specify
options like
resampling, histogram matching in the process?
the d.what.rast or the query tool to check to see if the black image
boundaries are in fact NULL, or if they are 0. If they are 0 use the
r.null module to set them to NULL, then try again.
As an alternative, you can use r.clump2 from GRASS-Addons
and flood-fill areas (here, the "black" boundary" using the
coordinate parameter.
