On 20/08/18 00:08, Jacki Pilon wrote:
Well, I start with a CSV file containing records of numbered things
(houses, parcells...) having a noun (a proper noun) and X, Y coordinates
values. These names and locations have been recorded from an old paper
map (X and Y are in millimeters). The geographic coverage of the map is
small (around 2 x 3 km, printed onto a 210 x 300 mm page).
The map shows hundreds of things worth being recorded.
I would like to georeference this set of "things" in order to display
them in position, overlaid on a general map.
A few of them (for example chapels, churches, crossroads...) can be
relatively easily located on modern, georeferenced, maps and hence, be
used as ground control points.
I first build a vector layer in importing this ascii file in QGIS, and I
could see a correct result, points at relative good positions and labels
with the nouns.
But now, I have troubles in using the QGIS georeferencer, as it seems
to accept only rasters (not vectors) and these rasters are supposed to
be files from the computer. I would prefer to use a VMS multilayer map
that would allow to take benefit of more than one single layer in the
process of defining the ground control points.
If you are working with QGIS then this is not the right mailing list for
you. You should use the dedicated QGIS mailing lists.
If you want to use GRASS, then you can use the tool I indicated, i.e.
g.gui.gcp. You can also look at v.rectify, or a combination of
m.transform and v.transform.
Moritz
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