Alas, even for MULTIPOINT, as there are no facilities for extracting
from aggregates, not even ST_Dump, in the end all one can do is
$ ogrinfo 0.lines.kml -al | perl -nwle \
'if(/LINESTRING.*\((.*)\)/){print for split /,/, $1}'
-100.79005679 36.38022 1000
-100.79008013 36.38531 1
$ ogrinfo 0.lines.kml -q -dialect SQLITE -sql \
'SELECT ST_PointN(GEOMETRY, generate_series(1, ST_NPoints(GEOMETRY))) FROM "0"'
ERROR 1: In ExecuteSQL(): sqlite3_prepare_v2(
no such function: generate_series
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> "ER" == Even Rouault writes:
ER> you can't do operations on geometries with OGR SQL...
OK, I'll try it. Thanks.
The page should still have an example of actual use of
Casting ... POINT[Z], LINESTRING[Z]
Without examples people will try things like POINTZ, "POINTS[Z]"
Hi. I will add an example to
https://gdal.org/user/ogr_sql_dialect.html#changing-the-type-of-the-fields
showing users how to e.g., CAST LINESTRING Z to POINTS Z, e.g.,
to extract the points from:
$ ogrinfo 0.lines.kml -q -sql 'SELECT "_ogr_geometry_" FROM "0"'
Layer name: 0
OGRFeature(0):1
LINEST
Or, how would I download a few tiles,
from openstreetmap, say near 24,121 lat/lon?
Yes, https://github.com/OSGeo/gdal/issues/2052#issuecomment-628650934
but of course works for me, but is black.
I suppose there is no way to pipe this into gdal2tiles, so I will save
it as a separate file(s) first.
I have got this far:
$ wget https://maps.nlsc.gov.tw/OpenData/wmts
$ gdalinfo wmts
I want to use
$ gdal2tiles
on one of its layers, for a few km. wide rectangle, for offline browsing.
So I need to somehow save the tiles from WMTS, and then feed them into
gdal2tiles.
Yes I read
https://gdal.org/d
Maybe http://www.gdal.org/ogr_feature_style.html is just a framework
and not something that is implemented anywhere?
Are there any examples of anybody using LABEL(f:"Times New
Roman",s:12pt,t:{text_string}) to print anything anywhere?
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All I want to do is try the various Label Placement Modes seen in
http://www.gdal.org/ogr_feature_style.html , given my LineString of .csv
Lon/Lat points that I stripped out of my .kml.
Surely there is a way to attach Label Placement Modes to a
LineSrting and then output it to some .png etc. file,
But this applies the style to all the points in the line, but I just
want to apply it to the line itself.
And then how can I finally print the result to a .png file? Convert to
.shp and view in qgis? But my .shp ended up with no points in it.
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I finally gave up and stipped the KML data into a .csv and finally
was able to (according to ogrinfo) successfully attach styles to it with
this .vrt file:
road.csv
wkbLineString
WGS84
SELECT *,'PEN(c:#FF00FF,w:10px)' AS OGR_STYLE FROM road
_
I failed miserably at adding ANY style to a shapefile.
$ ogrinfo -al -q zk2.shp|colrm 66
Layer name: zk2
Metadata:
DBF_DATE_LAST_UPDATE=2016-07-02
OGRFeature(zk2):0
Name (String) = zaokeng main road 中45市道
descriptio (String) = (null)
timestamp (Date) = (null)
begin (Date) = (null)
end
http://www.gdal.org/ogr_feature_style.html says
Here is what one of those .OFS files could look like:
OFS-Version: 1.0
StyleField: "style"
DefaultStyle: PEN(C:#00FF)
road: PEN(c:#FF,w:5px)
lake: BRUSH(fc:#FF);PEN(c:#00)
campsite: SYMBOL(c:#0
Well OK but the Debian guy closed all my bug reports instantly,
and on the man page you will need to give full examples, including input file
content,
before any of this becomes understandable. Thanks.
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h
I just have a single .
I want to put kilometer markers along it.
That is all I am trying to do.
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I am trying to use the ogrlineref command.
I can't even understand its man page.
Maybe it only works on shapefiles.
Maybe it only Seg Faults.
How can I get the locations of the kilometer markers given only this KML:
zaokeng main road 中45市道
1
120.86817,24.17922,0.0 120.86816,24.17922
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