Mark,
This sounds more like a GDAL question, in that your should probably
cleanup the images first.
A few things come to mind:
1) see if you can use nearblack utility to set the collars to NODATA
2) use gdal_translate with extents to copy only the data and not the collars
3) define a polygon around the good data, the there should be a way to
set everything outside the polygon to NODATA, not sure about the
specific commands to do this, but I believe it is possible.
-Steve W
On 12/6/2019 11:21 AM, Mark Volz wrote:
Hello,
I have a single mapfile that contains two layers. One layer includes
county wide aerial photography at medium resolution. The other layer
contains high resolution aerial photography for select cities in my
county. I would like to combine the two layers so that I can have a
single “maximum resolution available” image service. Unfortunately,
the high resolution air photos have a ~30 foot seamline at the edge of
the air photos. The seamline is not all the same exact color so I
cannot set a transparency.
Question:
Would specifying an extent on the high resolution imagery allow me to
cut off the edge of the imagery (thus removing the area where there is
a seamline)? Also, I am referencing all of the high resolution images
through a tile index so is there a way to also specify extents within
the tile index, or would I need to separate each of the cities into
different layers?
Thanks!
Mark Volz
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