Hi,
just some thoughts:
- I assume you want to have QGIS create label texts for all your data in
one go. If that is the case this is a misunderstanding of what labels
are (in QGIS): QGIS creates (and places) the labels at run-time for the
map extract currently on display. Labels thus are no features of their
own (GIS only knows points/lines/polygons) but a way to display GIS
features (like e.g. color, outline etc.)
- This means the labels are valid for this particular map extract in
this particular scale. E.g. imagine a lake (= one polygon) that expands
on two map extracts, it will be labeled in both => one feature, two labels
- Thus the label text is only within QGIS, export may be possible with
dxf-export
- IMHO it doesn't make sense to try to use the labels outside of QGIS;
what is your intended final result? Which software are you planning to
use for creating your final result?
- There will be map extracts with "many" labels (city centres) and map
extracts with "few" labels (boondocks).
- QGIS can prevent overlapping labels; in placement you can assign a
priority to the labels of this layer (so e.g. rivers are always labeled
whereas streets only if not in conflict with rivers)
- The rule based labelling works _within_ a layer; a rule is a logical
statement about the feature to be labeled. The logic can be based on the
feature's attribute values or geometry (e.g. label only lakes larger than x)
- points are vector features, too, so there is no real difference
between labelling points, lines or polygons.
- Be sure to have read the doc:
http://docs.qgis.org/2.14/en/docs/user_manual/working_with_vector/vector_properties.html#labels-menu#
hope this helps
Bernhard
Am 05.07.2017 um 09:11 schrieb Jeshua Lacock:
Greetings,
I currently have all the base layers for a 1:24k topographic national map of
the US worked out. Many many terabytes of data currently all in GRASS.
The last hurdle I have is to figure out the best way for labeling vector
features (hydro, roads, contours) and point text (mountain summit names, place
names, etc.).
Based on my research so far, it seems that QGIS might be one, if not the most
powerful open source software for GIS text labels.
A few questions, if I may. I am new to QGIS so please forgive me if I am asking
something that is obvious.
1. Is text that is created with the Rule-based labeling feature exportable, or
is it is only for display in QGIS? If it is exportable, what formats can it be
exported to? Anything besides raster?
2. Would it be possible to generate labels for the entire nation (millions of
labels) with the rule-based labels, or would I have to do it in many sections?
3. For point text, are there any algorithms that help prevent labels from
overlapping each other? Such as those outlined at:
https://en.wikipedia.org/wiki/Automatic_label_placement
4. Can point text be used with the rule-based labeling or is it only for vector
data with attributes?
If anyone has undertaken a similar task as I am researching, I would certainly
appreciate any and all feedback and advice.
Many thanks,
Jeshua Lacock
Founder/Engineer
<3DTOPO.com>
GlassPrinted.com
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