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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | [gislist] Georeferencing |
| Date: |
03/22/2004 08:05:00 AM |
| From: |
Bigyan Kar |
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Hi Listers,
I am trying to georeference a raster by just inputting the set of known
lat/longs at the four image corners such as upper left, upper right, lower
left and lower right. Most of the softwares ask to provide the set of source
control points and the respective destination control points to execute the
task. After picking the source control point on the raster corner, we can
provide the destination control point in terms of lat/long values by
keyboard instead of picking the point on the map. I am sure this is an
effective way to increase accuracy.
But the problem is that, I am not finding a way to exactly pick the corners
of the raster when providing source control point as there is no snapping
option available. So, the result is that, there is a little deviation from
the actual position. If there would be an option, either to provide the
source control points as lat/long values by keyboard or if any software
automatically tracks the four corners of the raster as source points, I
think the raster would be fitted exactly.
Can anyone suggest that, if there is any softwares/methodologies/techniques
available, which can solve this problem.
Regards,
Bigyan Kar
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