Can someone add a note to http://grass.itc.it/devel to the effect that the latest development code is over at the osgeo site, and not on the CVS server? It's quite misleading as it stands now. For example, there is no way to know that you are not looking at the current code without following a random link from this mailing list.
Cheers,
David
Hello , i'm undergraduate and for my research of
landscape i using the v.digit to digit the satelite
image, but i find very difficult to use this tool
(maybe because i don't have the basic concept). i have
using common boundary but still some time there
problems because the area won't close (stiil gray
color, i dont change the color of v.digit). can
someone tell me how to use this tool and where should
i start the digit. In the middle of satelite image or
in the corner.
thank you very much
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yazid bekti wrote:
Hello , i'm undergraduate and for my research of
landscape i using the v.digit to digit the satelite
image, but i find very difficult to use this tool
(maybe because i don't have the basic concept). i have
using common boundary but still some time there
problems because the area won't close (stiil gray
color, i dont change the color of v.digit). can
someone tell me how to use this tool and where should
i start the digit. In the middle of satelite image or
in the corner.
thank you very much
probably you have found one of two frustrating features in the GRASS 6
Tcl digitizer: when you digitize an area it won't snap the endpoints
together. You have to put the last point near to the first, then switch
to the "move vertex" tool and move the last onto the first. Then it
will snap closed and the line should turn green. Don't forget to place
a centroid in the closed area, containing the area's category number.
(the other frustrating feature being you can't pan around without
dropping out of digitizing mode)
hopefully these can be fixed with the brand new wx digitizer currently
under development.
hope that helps,
Hamish
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Hi!
On Thu, 2008-02-14 at 19:32 -0800, yazid bekti wrote:
Hello , i'm undergraduate and for my research of
landscape i using the v.digit to digit the satelite
image, but i find very difficult to use this tool
(maybe because i don't have the basic concept). i have
using common boundary but still some time there
problems because the area won't close (stiil gray
color, i dont change the color of v.digit). can
someone tell me how to use this tool
Try using QGIS (with qgis-plugin-grass) with which pan-ing is
convenient.
and where should i start the digit.
In the middle of satelite image or
in the corner.
What is exactly your task?
Just to digitize some "objects" within you image?
Create a vector grid, overlay it over your image so it's easy to
remember in which part of the image you have worked, to locate "objects"
of your interest... etc.
If you need to georeference an image you can "play" first in the corners
trying to nail your image (as like when you want to hang a poster in
the wall!) and then move more in the inner locations and successively in
the centre.
thank you very much
Cheers,
Nikos
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--
Nikos Alexandris
.
Department of Remote Sensing & Landscape Information Systems
Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University Freiburg
.
Tel. +49 (0) 761 203 3697 / Fax. +49 (0) 761 203 3701 / Skype: Nikos.Alexandris
.
Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany
Nikos Alexandris wrote:
If you need to georeference an image you can "play" first in the
corners trying to nail your image (as like when you want to hang a
poster in the wall!) and then move more in the inner locations and
successively in the centre.
There is a little known but neat feature in the i.vpoints
georeferencing module to reverse-project a vector layer from the target
location over the source raster image that you are trying to create
GCPs for, using the current set of tie points.
Once you have created some GCPs click the "ANALYZE" -> "OVERLAY" button
to chose an overlay vector from the target mapset.
i.vpoints is also interesting from the fully visual "parallel click"
interface. You click on a spot on the source image in the left pane,
then click on the matching point on the raster or vector map (from the
target mapset) on the right pane. From those two clicks it grabs and
fills in the source+target coordinates for you. This can be a very
quick way of georeferencing a map. Once you have done a few GCPs you
can then reverse-overlay the vector to test how it looks.
Maybe this could oneday make it into the new GUI georeferencing tools?
Hamish
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On Feb 14, 2008 11:26 PM, David Mahoney <mahoneyd@unbc.ca> wrote:
Can someone add a note to http://grass.itc.it/devel to the effect that
the latest development code is over at the osgeo site, and not on the
CVS server? It's quite misleading as it stands now. For example, there
is no way to know that you are not looking at the current code without
following a random link from this mailing list.
David,
thanks for the pointer. I have updated many links on that page. It
will propagate to itc.it within some hours, the (new) master site
is updated:
Please don't hesitate to indicate further link breakage due to the
OSGeo migration.
Markus